Optical lens and electronic equipment

Abstract

The invention discloses an optical lens and electronic equipment. The optical lens comprises a first lens, a second lens, a third lens and a seventh lens which are sequentially arranged from a first side to a second side along an optical axis, the first lens has negative focal power and is convex-concave in surface type, the second lens has negative focal power and is concave in first side surface, the third lens has positive focal power, and the first side surface of the fourth lens is convex; the fifth lens and the sixth lens are glued and have positive and negative focal powers; the lens satisfies the following conditional expressions: 0.03 < = (d5 + d6) / TTL < = 0.2, 2 < = F7 / F,-5 < = R4 / R5 < = 0.8,-25 < = F2 / F < =-2, 0.06 < = d45 / TTL < = 0.2, and TTL / F < = 4.5, where d5 and d6 are the center thickness of the fifth lens and the sixth lens respectively, TTL is the total optical length of the lens, F7 is the effective focal length of the seventh lens, F is the total effective focal length of the lens, R4 and R5 are the curvature radiuses of the second side surface of the second lens and the first side surface of the third lens respectively, F2 is the effective focal length of the second lens, and d45 is the effective focal length of the third lens. And d45 is an air interval between the fourth lens and the fifth lens.

Description

Technical Field

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

[0002] With the continuous development of automobile intelligence and autonomous driving technology, the market for automotive lenses continues to grow. In the next few years, the number of automotive lenses will increase significantly to meet higher levels of autonomous driving functions and safety requirements. Among them, front-view and side-view cameras are key components for realizing ADAS (Advanced Driving Assistance System) and autonomous driving functions, and their market demand is particularly strong.

[0003] Since the actual road detection situation is relatively complex and requires the lens to have a good ability to recognize objects, the imaging quality of the lens itself is required to be high, and in order to adapt to more abundant application scenarios, high resolution has gradually become an urgent need for people. On the basis of meeting the imaging requirements of vehicle-mounted lenses, the smaller the lens, the easier it is to install the vehicle-mounted lens, but this will lead to a contradiction between the resolution of ordinary vehicle-mounted lenses and miniaturization. The reduction in the overall size of the vehicle-mounted lens also affects the size of the luminous flux entering the lens. The reduction in luminous flux will affect the illumination, which will cause the captured picture to be dark and cannot meet market demand. In addition, vehicle-mounted lenses used for assisted driving should reduce ghost images and stray light as much as possible to avoid severe ghost image halos affecting the driver's judgment of the actual scene.

[0004] However, existing optical lenses still have many deficiencies in the above aspects and need to be improved and enhanced. For example, existing optical lenses often cannot meet the requirements of high resolution and miniaturization at the same time; existing optical lenses generally require low light transmission and cannot meet the requirements in low-light environments such as night; and in terms of ghost images, existing optical lenses cannot meet the current requirements of weak ghost images. Therefore, having some or all performance characteristics such as high resolution, low sensitivity, weak ghost images, miniaturization and high light flux has become the main development direction of current automotive lenses. Summary of the invention

[0005] The present application provides an optical lens, which may include, in sequence from the first side to the second side along the optical axis: a first lens with negative optical power, whose first side surface is convex and whose second side surface is concave; a second lens with negative optical power, whose first side surface is concave; a third lens with positive optical power; a fourth lens with optical power, whose first side surface is convex; a fifth lens with optical power; a sixth lens with optical power; and a seventh lens with optical power; wherein the fifth lens is glued to the sixth lens, and the fifth lens and the sixth lens have opposite optical power properties, positive and negative; the number of lenses with optical power in the optical lens is seven. The optical lens may satisfy the following conditional formulas: 0.03≤(d5+d6) / TTL≤0.2; 2≤|F7 / F|; -5≤R4 / R5≤0.8; -25≤F2 / F≤-2; 0.06≤d45 / TTL≤0.2; and TTL / F≤4.5; wherein d5 is the center thickness of the fifth lens on the optical axis, d6 is the center thickness of the sixth lens on the optical axis, TTL 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, F7 is the effective focal length of the seventh lens, F is the total effective focal length of the optical lens, R4 is the curvature radius of the second side surface of the second lens, R5 is the curvature radius of the first side surface of the third lens, F2 is the effective focal length of the second lens, and d45 is the air spacing between the fourth lens and the fifth lens on the optical axis.

[0006] In one embodiment, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens may satisfy: 1.5≤F3 / F≤8.

[0007] In one embodiment, a distance BFL from the center of the second side surface of the seventh lens to the imaging plane of the optical lens on the optical axis and a distance TTL from the center of the first side surface of the first lens to the imaging plane on the optical axis may satisfy: BFL / TTL≤0.15.

[0008] In one embodiment, the air interval d67 between the sixth lens and the seventh lens on the optical axis and the distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis may satisfy: 0.05≤d67 / TTL≤0.2.

[0009] In one embodiment, the image height H corresponding to the maximum field angle of the optical lens, the total effective focal length F of the optical lens, and the arc value θ of the maximum field angle of the optical lens may satisfy: |(HF×θ) / (F×θ)|≤0.1.

[0010] In one embodiment, a curvature radius R3 of the first side surface of the second lens and a curvature radius R4 of the second side surface of the second lens may satisfy: -0.5≤R3 / R4≤2.

[0011] 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 may satisfy: 50≤(FOV×F) / H≤75.

[0012] In one embodiment, the maximum effective light aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the total effective focal length F of the optical lens may satisfy: 0.1≤D / H / F≤0.25.

[0013] In one embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens may satisfy: -2.8≤F1 / F≤-1.

[0014] In one embodiment, the total effective focal length F of the optical lens and the effective focal length F4 of the fourth lens may satisfy: -1≤F / F4≤1.5.

[0015] In one embodiment, the center thickness d2 of the second lens on the optical axis and the distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis may satisfy: 0.005≤d2 / TTL≤0.12.

[0016] In one embodiment, the air gap d23 between the second lens and the third lens on the optical axis, the air gap d34 between the third lens and the fourth lens on the optical axis, and the distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis may satisfy: (d23+d34) / TTL≤0.1.

[0017] In one embodiment, the air interval d23 between the second lens and the third lens on the optical axis and the distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis may satisfy: d23 / TTL≤0.08.

[0018] In one embodiment, the air interval d34 between the third lens and the fourth lens on the optical axis and the distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis may satisfy: d34 / TTL≤0.01.

[0019] In one embodiment, the total effective focal length F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens may satisfy: 0.7≤F / H≤0.95.

[0020] In one embodiment, the radius of curvature R7 of the first side surface of the fourth lens and the total effective focal length F of the optical lens may satisfy: 0.5≤R7 / F≤2.5.

[0021] In one embodiment, the optical lens may satisfy at least one of the following conditions: -3≤R11 / F≤1.5; -8≤F5 / F6≤-0.1; (R1 / D) / (R2 / D2)≤9; F / ENPD≤2; 1.8≤R1 / F≤8.5; -10≤R6 / R7≤25; 0.5≤F56 / F≤30; wherein R11 is the radius of curvature of the second side surface of the fifth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, R1 is the radius of curvature of the first side surface of the first lens, R2 is the radius of curvature of the second side surface of the first lens, D2 is the maximum effective aperture of the second side surface of the first lens corresponding to the maximum field of view of the optical lens, ENPD is the entrance pupil diameter of the optical lens, R6 is the radius of curvature of the second side surface of the third lens, F56 is the combined focal length of the fifth lens and the sixth lens, and the meanings of the remaining parameters are the same as above.

[0022] In one embodiment, the optical lens may satisfy at least one of the following conditions: 0.09≤(d5+d6) / TTL≤0.16; 2≤|F7 / F|≤80; 2.2≤|F7 / F|≤55; -4≤R4 / R5≤0.6; -20≤F2 / F≤-2.5; 0.07≤d45 / TTL≤0.18; 3.5≤TTL / F≤4.3; 1.7≤F3 / F≤6.5; 0.08≤BFL / TTL≤0.13; 0.06≤d67 / TTL≤0.15; 0.002≤|(HF×θ) / (F×θ)|≤0.08; -0.3≤R3 / R4≤1.2; 55≤(FOV×F) / H≤65; 0.1 2≤D / H / F≤0.19;-2.2≤F1 / F≤-1.2;-0.5≤F / F4≤1;0.01≤d2 / TTL≤0.09;(d23+d34) / TTL≤0.06;d23 / TTL≤0.06;d34 / TTL≤0.005;0.75≤F / H≤0.9;0.7≤R7 / F≤1.8;-2≤R11 / F≤1;-6≤F5 / F6≤-0.2;1.25≤(R1 / D) / (R2 / D2)≤7.75;1.7≤F / ENPD≤1.9;2≤R1 / F≤8;-7≤R6 / R7≤-0.5;0.7≤F56 / F≤24;Wherein, the meanings of the parameters are the same as above.

[0023] In one embodiment, the optical lens may satisfy at least one of the following conditions: 0.1081≤(d5+d6) / TTL≤0.1505; 2.6553≤|F7 / F|≤34.7521; -2.7008≤R4 / R5≤0.3174; -14.9343≤F2 / F≤-3.0069; 0.0806≤d45 / TTL≤0.1501; 3.8753≤TTL / F≤4.1300; 1.89 48≤F3 / F≤4.9664; 0.0920≤BFL / TTL≤0.1209; 0.0710≤d67 / TTL≤0.1247; 0.0039≤|(HF×θ) / (F×θ)|≤0 .0558; -0.0605≤R3 / R4≤0.8217; 57.0731≤(FOV×F) / H≤60.6826; 0.1434≤D / H / F≤0.1808; -1.9572≤F1 / F≤-1.3275; -0.1922≤F / F4≤0.7230; 0.0250≤d2 / TTL≤0.0759; 0.0065≤(d23+d34) / TTL≤0.0428; 0.0032≤d23 / TTL≤0.0397; 0.0031≤d34 / TTL≤0.0032; 0.8142≤F / H≤0.8657; 0.9915≤R7 / F≤1.6721; -1. 5128≤R11 / F≤0.6900;-3.7543≤F5 / F6≤-0.2725;2.5211≤(R1 / D) / (R2 / D2)≤6.4461;1.8000≤F / ENPD≤1.8200;2.2309≤R1 / F≤5.8821;-5.5184≤R6 / R7≤17.6805;0.9904≤F56 / F≤19.2509;The meaning of each parameter is the same as above.

[0024] On the other hand, the present application provides an electronic device, which includes an optical lens provided by the present application and an imaging element for converting an optical image or optical information formed by the optical lens into an electrical signal, wherein the imaging element is located on the second side of the optical lens, and light from the first side forms an image on the second side after passing through the optical lens. Alternatively, the electronic device includes an optical lens and a light source provided by the present application, wherein the light source is located on the second side of the optical lens, and light emitted by the light source is projected onto the first side of the optical lens after passing through the optical lens, forming an image or illuminating an area on the first side.

[0025] The optical lens according to the exemplary embodiment of the present application includes seven lenses with optical power, which are the first to seventh lenses arranged in sequence from the first side to the second side along the optical axis, wherein the first lens has negative optical power, and its first side surface is convex, and the second side surface is concave; the second lens has negative optical power, and its first side surface is concave; the third lens has positive optical power; the first side surface of the fourth lens is convex; the fifth lens is cemented with the sixth lens, and the fifth lens and the sixth lens have opposite optical power properties of positive and negative; and the center thickness d5 of the fifth lens on the optical axis and the center thickness d6 of the sixth lens on the optical axis are the same as the center of the first side surface of the first lens to the imaging of the optical lens. The distance TTL between the surfaces on the optical axis satisfies the conditional formula 0.03≤(d5+d6) / TTL≤0.2; the effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy the conditional formula 2≤|F7 / F|; the curvature radius R4 of the second side surface of the second lens and the curvature radius R5 of the first side surface of the third lens satisfy the conditional formula -5≤R4 / R5≤0.8; the effective focal length F2 of the second lens and F satisfy the conditional formula -25≤F2 / F≤-2; the air interval d45 between the fourth lens and the fifth lens on the optical axis and TTL satisfy the conditional formula 0.06≤d45 / TTL≤0.2; TTL and F satisfy the conditional formula TTL / F≤4.5. By setting the lens in this way, the thickness of the cemented lens can be appropriately increased within a certain range, which is conducive to enhancing the ability to control light and improving the image quality; the focal length of the seventh lens is reasonably controlled to be larger and the light deflection is smaller, which is conducive to the seventh lens being close to the image plane, and a smaller back focus can be achieved, and a large image plane can be achieved, which is conducive to increasing the distance from the sixth lens, improving the sensitivity of the system, and improving the image quality; the ratio of the curvature radius of the second side of the second lens to the curvature radius of the first side of the third lens is reasonably controlled to continuously diverge the light passing through the first and second lenses, which is conducive to increasing the incident height of the edge light, reducing distortion, and improving resolution; the focal length of the second lens is reasonably controlled to be larger, which is conducive to receiving the light that diverges rapidly in front, so that the light can be further effectively diverged. The light enters the rear optical system without excessive divergence affecting the rear port diameter, and is also beneficial to reducing the system sensitivity and improving the imaging quality; the light begins to converge through the third lens, and shows an overall convergence trend when emitted through the fourth lens. The larger spacing between the fourth and fifth lenses is beneficial to the effective convergence of the light, reducing the rear port diameter, and the light can smoothly transition to the fifth lens, reducing the aberration caused by the continuous convergence of the third and fourth lenses, which is beneficial to improving the imaging quality; at the same time, the reasonable setting of the spacing between the fourth and fifth lenses can leave space for the adjustment of the back focus, solve the assembly problem on the basis of meeting the miniaturization, and achieve high resolution; and according to the optical lens of the present application, the length of the lens can also be effectively limited, and the lens can achieve miniaturization and telephoto.

[0026] The optical lens according to the exemplary embodiment of the present application adopts a seven-piece lens architecture. By reasonably setting parameters such as the lens optical power, surface shape, curvature radius, center thickness, and air space between lenses, the optical lens can have one or more beneficial effects such as high resolution, low sensitivity, weak ghost images, miniaturization, and high luminous flux, so that the optical lens can better meet the high requirements of, for example, automotive applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of the embodiments in conjunction with the accompanying drawings. In the accompanying drawings: Figure 1 A schematic diagram showing the structure of an optical lens according to Embodiment 1 of the present application; Figure 2 A schematic diagram showing the structure of an optical lens according to Embodiment 2 of the present application; Figure 3 A schematic diagram showing the structure of an optical lens according to Embodiment 3 of the present application; Figure 4 A schematic diagram showing the structure of an optical lens according to Embodiment 4 of the present application; Figure 5 A schematic diagram showing the structure of an optical lens according to Embodiment 5 of the present application; Figure 6 A schematic diagram showing the structure of an optical lens according to Embodiment 6 of the present application; Figure 7 A schematic diagram showing the structure of an optical lens according to Embodiment 7 of the present application; Figure 8 A schematic diagram showing the structure of an optical lens according to Example 8 of the present application; Fig. 9 A schematic diagram showing the structure of an optical lens according to Example 9 of the present application; Fig.10 A schematic diagram showing the structure of an optical lens according to Embodiment 10 of the present application; Fig.11 A schematic diagram showing the structure of an optical lens according to Example 11 of the present application; Fig.12 A schematic diagram showing the structure of an optical lens according to Embodiment 12 of the present application; Fig.13 A schematic diagram showing the structure of an optical lens according to Embodiment 13 of the present application; Fig.14 The MTF diagram of the optical lens according to Example 1 of the present application is shown. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numbers refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0029] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0030] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0031] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface 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 position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the 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.

[0032] It should be understood that the optical lens provided in this application can be used for both video and projection, and can also be used for laser radar lenses. When the optical lens provided in this application is used for a video lens or a laser radar receiving end lens, the video lens can be, for example, a vehicle-mounted camera, an infrared camera, a drone camera, a night vision camera, a security monitoring camera, etc., and the "first side" involved in this article can refer to the object side, and the "second side" can refer to the image side, and the light from the object side can be imaged on the image side; when the optical lens provided in this application is used for a projection lens or a radar transmitting end lens, the "first side" involved in this article can refer to the object side, and the "second side" can refer to the light source side, and the light from the light source side is projected to the first side after passing through the optical lens, and forms an image or illuminates the area on the first side.

[0033] 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 exclude 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 listed 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.

[0034] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms 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 explicitly defined in this article.

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present 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.

[0036] The features, principles and other aspects of the present application are described in detail below.

[0037] In an exemplary embodiment, the optical lens includes, for example, seven lenses having optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven lenses may be arranged in sequence from the first side to the second side along the optical axis.

[0038] In an exemplary embodiment, the first side may be, for example, the object side, and the second side may be, for example, the image side. Accordingly, the first side surface of each lens in the first lens, the second lens, the third lens, the fourth lens, and the fifth lens may be the object side surface of each lens, and the second side surface of each lens may be the image side surface of each lens.

[0039] In an exemplary embodiment, the optical lens may further include an imaging surface and a photosensitive element disposed on the imaging surface. Optionally, the photosensitive element disposed on the imaging surface may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0040] In an exemplary embodiment, the optical lens of the present application may further include a filter and / or a protective glass disposed between the seventh lens and the imaging surface as required. The filter may filter light having a specific wavelength, and the protective glass may prevent the second side element (e.g., chip) of the optical lens from being damaged.

[0041] In this article, the center thickness of a lens (on the optical axis) can be understood as the distance on the optical axis from the center of the first side surface of the lens to the center of the second side surface of the lens. Taking the second lens as an example, the center thickness d2 of the second lens can be understood as the distance on the optical axis from the center of the first side surface of the second lens to the center of the second side surface of the second lens. In addition, in this article, the air gap between two adjacent lenses (on the optical axis) can be understood as the distance on the optical axis from the center of the second side surface of the lens closer to the first side of the lens closer to the second side of the lens. Taking the air gap d45 between the fourth lens and the fifth lens on the optical axis as an example, it can be understood as the distance on the optical axis from the center of the second side surface of the fourth lens to the center of the first side surface of the fifth lens.

[0042] In an exemplary embodiment, the first lens may have a negative optical power. The first lens may have a convex-concave type. The first lens has a negative optical power and has a divergent effect on the light passing through it. Under the same field of view angle, the light emitted through the image side of the first lens can enable the subsequent optical system to have a larger light receiving surface; the first lens may preferably be made of a lens material with a high refractive index, which is beneficial to the reduction of the front port diameter and the improvement of the imaging quality. The object side of the first lens is designed to be a convex surface, which can collect as much light of a large field of view as possible to enter the rear optical system, and in the actual use environment, such as rainy and snowy weather, it can be beneficial to the sliding of water droplets, etc., reducing the impact on imaging. The image side of the first lens is a concave surface, which can quickly diverge the large-angle light passing through the object side of the first lens, which is beneficial to the aberration correction of the large-angle light by the rear optical system to achieve high resolution.

[0043] In an exemplary embodiment, the second lens may have a negative optical power. The second lens may have a concave-concave surface. The second lens has a negative optical power and has a divergent effect on light. It can disperse the central light and the edge light of each field of view, expand the rear light aperture, and increase the system illumination. The double concave structure can better diverge the light, which is conducive to the correction of the aberration of the edge light and the central light to achieve high resolution. Under the same field of view angle, the light emitted from the image side of the first lens can make the subsequent optical system have a larger light receiving surface, achieve a larger amount of light entering, and increase the brightness of the image surface. The object side of the second lens is a concave surface, which cooperates with the concave surface of the image side of the first lens, so that the light emitted from the second lens is smoothly incident on the object side of the third lens, which is conducive to the smooth transition of light, can reduce the loss of light energy, and is conducive to the illumination of the peripheral field of view. At the same time, the trend of the edge light is changed, and the front port diameter of the lens is reduced, which is conducive to miniaturization and cost reduction.

[0044] In an exemplary embodiment, the second lens may have a negative optical power. The second lens may have a concave-convex surface. The object side of the second lens is concave, which diverges the light, which is conducive to receiving the light diverged from the image side of the first lens, and can make the light exit smoothly, which is conducive to improving the field curvature and other off-axis aberrations. The image side of the second lens is convex, which can reduce the incident height of large-angle light, thereby reducing the diameter of the rear port of the lens, which is conducive to miniaturization of the lens.

[0045] In an exemplary embodiment, the third lens may have positive optical power. The third lens may have a concave-convex surface. The third lens has positive optical power, which converges the incident light, which is conducive to more light entering the optical system, improving the luminous flux, converging the light diverging in front, and improving the imaging quality; the object side of the third lens is concave, which is conducive to better receiving the light diverging through the second lens, leaving enough space for the aberration adjustment of the rear light, and the image side is convex, which increases the light deflection angle, further converges the light, and realizes the miniaturization of the rear end.

[0046] In an exemplary embodiment, the third lens may have positive optical power. The third lens may have a convex-convex surface. The third lens is a positive focal length lens, and the object side surface is convex, which has a converging effect on light, can further reduce aberrations and improve imaging quality; the image side of the third lens is convex, and the edge field light has a downward trend after passing through the image side surface of the third lens, avoiding excessive deflection of light and improving system sensitivity.

[0047] In an exemplary embodiment, the third lens may have positive power. The third lens may have a convex-concave surface. The image side of the third lens is concave, and the light further transitions to the fourth lens, which is conducive to the light's trend in the rear lens becoming smooth.

[0048] In an exemplary embodiment, the fourth lens may have a positive optical power. The fourth lens may have a convex-concave type. The fourth lens is a positive focal length lens, and the object side surface is a convex surface, which has a converging effect on the light, reduces the back port diameter, and reasonably sets the optical power of the fourth lens to further reduce aberrations and improve imaging quality; the shape of the fourth lens is convex-concave, and the convex object side surface is conducive to collecting the light entering the fourth lens, and the concave image side surface makes the edge light diverge appropriately, thereby improving the light throughput of the optical system.

[0049] In an exemplary embodiment, the fourth lens may have positive optical power. The fourth lens may have a convex-convex surface. The image side of the fourth lens is convex, and the marginal field light is further converged after passing through the image side of the fourth lens, which is conducive to reducing the diameter of the system back port, while reducing energy loss and improving imaging quality.

[0050] In an exemplary embodiment, the fourth lens may have a negative optical power. The fourth lens may have a convex-concave type. The fourth lens has a negative optical power, and the object side surface is a convex surface, which can compress the angle of the incident light to achieve a smooth transition of the light, so that the divergent light can smoothly enter the rear, and further make the light trend smoothly transition, which is conducive to reducing the rear end lens diameter. The object side surface of the fourth lens is a convex surface, and the image side surface is a concave surface. When the light reaches the image side surface, it is almost vertically incident, the light deflection is small, the light energy loss is small, and it is also conducive to reducing the sensitivity of the lens. When the fourth lens is negative, it is a shape close to concentric circles, which plays a transitional role for the light.

[0051] In an exemplary embodiment, the fifth lens may have positive optical power. The fifth lens may have a convex-convex surface. The fifth lens is a positive lens, which has a converging effect on light. By controlling the focal length of the fifth lens, the aberration of the system can be effectively corrected, the image quality can be improved, and the optical performance such as distortion and CRA can be optimized.

[0052] In an exemplary embodiment, the fifth lens may have a negative optical power. The fifth lens may have a convex-concave surface. The fifth lens is a negative focal length lens, which has a divergent effect on light, so that the subsequent optical system has a larger light receiving surface, and the reasonable distribution of optical power is conducive to reducing aberrations and improving optical performance.

[0053] In an exemplary embodiment, the sixth lens may have a negative optical power. The sixth lens may have a concave-convex surface type. The sixth lens is a negative focal length lens, which has a divergent effect on light. Reasonable setting of the optical power of the sixth lens can further reduce aberrations and improve imaging quality; the image side convex surface converges light and adjusts the height of marginal light on the image plane, which is conducive to improving CRA. The fifth and sixth lenses can be cemented parts, which can smoothly transition the light passing through the fourth lens to the imaging surface and reduce the total length; various aberrations of the optical system can be fully corrected, and the resolution can be improved under the premise of compact structure, and the optical performance such as distortion and CRA can be optimized; the use of cemented parts can also reduce the sensitivity of tolerances such as tilt / eccentricity generated by independent lens units during the assembly process; further, the assembly method of the entire set of lenses reduces multiple assembly processes.

[0054] In an exemplary embodiment, the sixth lens may have a negative optical power. The sixth lens may have a concave-concave surface. The sixth lens has a negative optical power, which adjusts the trend of the light emitted from the fifth lens, so that the light is more reasonably diverged to the rear lens, reducing the field curvature between different fields of view. The object side of the sixth lens is a concave surface, which can receive and diverge the front light. The light of the edge field of view will have a longer optical path than the light of the center field of view after passing through the sixth lens, which changes the trend of the light of the edge field of view, is conducive to defocus correction of the edge field of view aberration, and achieves high resolution. The image side of the sixth lens is a concave surface, which is conducive to raising the height of the emitted light, reducing the overlap of light of different fields of view on the rear aspherical lens, so that the rear lens can better correct the aberration between different fields of view.

[0055] In an exemplary embodiment, the sixth lens may have a positive optical power. The sixth lens may have a convex-convex surface type. The sixth lens is a positive focal length lens, which has a converging effect on light, and the biconvex structure can further deflect the light toward the optical axis, reducing the back port diameter. The fifth and sixth lenses may be cemented parts, which can smoothly transition the light passing through the fourth lens to the imaging surface, reducing the total length; various aberrations of the optical system can be 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.

[0056] In an exemplary embodiment, the seventh lens may have a negative optical power. The seventh lens may have a convex-concave surface. The seventh lens having a negative optical power is conducive to the divergence of light, so that the angle from the light to the image plane meets the CRA requirements, and improves the resolution and illumination, increases the image plane, and achieves a large angular resolution at the edge; the object side of the seventh lens is a convex surface, which can converge the light, deflect the light toward the center, and improve the imaging quality of the central field of view; the image side of the seventh lens is a concave surface, which can further correct the system aberration, improve the image quality, and optimize the optical performance such as distortion and CRA.

[0057] In an exemplary embodiment, the seventh lens may have a negative optical power. The seventh lens may have a concave-concave surface. The object side of the seventh lens is a concave surface, which can better receive the light passing through the sixth lens and reduce light loss; the image side is a concave surface, which can further correct system aberrations, improve image quality, and optimize optical performance such as distortion and CRA.

[0058] In an exemplary embodiment, the seventh lens may have a negative optical power. The seventh lens may have a concave-convex surface type. The seventh lens is concave-convex, and the object side surface is concave, which can better receive the light passing through the sixth lens and reduce light loss; the image side surface is convex, which can appropriately converge the light, achieving miniaturization and high resolution.

[0059] In an exemplary embodiment, the seventh lens may have positive power. The seventh lens may have a convexo-concave surface. The seventh lens has positive power, which is conducive to light convergence. The convexo-concave shape allows the divergent light to enter the rear smoothly, which is conducive to correcting system aberrations. At the same time, the seventh lens can lower the height of the light incident on the subsequent optical system and reduce the diameter of the rear port.

[0060] In an exemplary embodiment, the seventh lens may have positive power. The seventh lens may have a concave-convex surface type. The seventh lens has positive power, a concave surface on the object side, and a convex surface on the image side, which can effectively balance chromatic aberration, limit CRA, and improve resolution; further adopts an aspherical surface design to make the peripheral large-angle light as much as possible smoothly transition to the rear optical system, correcting astigmatism and field curvature.

[0061] It should be noted that, in the above descriptions of the optical power and surface shape of each lens from the first lens to the seventh lens, for the technical effect of each lens under the corresponding optical power (positive optical power or negative optical power), the technical effect of the first side surface of each lens under the corresponding surface shape (convex surface or concave surface), and the technical effect of the second side surface of each lens under the corresponding surface shape (convex surface or concave surface), in order to avoid excessive repetition, the technical effects of some features are omitted in the description of some exemplary embodiments. For the omitted technical effects, reference may be made to the relevant descriptions of the lens recorded in other exemplary embodiments.

[0062] In an exemplary embodiment, the optical lens may further include an aperture. The aperture may constrain the light path and control the light intensity. The aperture may be set at an appropriate position of the optical lens, for example, the aperture may be located between the fourth lens and the fifth lens. Reasonable setting of the position of the aperture may facilitate the effective convergence of light entering the optical system, reduce the lens aperture at the rear end of the optical system, and reduce the assembly sensitivity of the system. However, it should be noted that the position of the aperture disclosed herein is only an example and not a limitation; in alternative embodiments, the aperture may also be set at other positions according to actual needs.

[0063] In an exemplary embodiment, the fifth lens and the sixth lens may have opposite positive and negative optical powers. The fifth lens and the sixth lens may be glued to form a glued lens. The use of the glued part can effectively eliminate the influence of ghost images on the lens, so that the lens can ensure a higher resolution on the basis of eliminating ghost images. It has many technical effects. For example, first, the use of the glued lens can fully correct various aberrations of the optical system, improve the resolution, optimize the optical performance such as distortion and CRA under the premise of compact structure; second, the negative lens in the glued part has a higher refractive index than the positive lens, so that the light can be effectively and smoothly converged at the end, so that the light can reach the imaging surface smoothly, reducing the overall weight and cost; third, the light loss caused by reflection between lenses is reduced; the combination of high and low refractive indices is conducive to the rapid transition of the front light, increasing the aperture and improving the light transmission; fourth, the use of the glued part reduces the air gap between the two lenses, making the overall structure of the optical system compact, while reducing the tolerance sensitivity problems such as overall eccentricity caused by the lens unit during the assembly process.

[0064] In an exemplary embodiment, one or more aspherical lenses may be included in the first to seventh lenses. The aspherical mirror surface has different curvatures at different positions, which can adjust the light trend to converge to the image plane, have better curvature radius characteristics, can effectively correct aberrations and field curvatures, and improve the resolution of the optical system; can improve distortion aberrations and improve astigmatism aberrations, eliminate aberrations that occur during imaging as much as possible, and improve the imaging quality of the lens. For example, in some embodiments, an aspherical lens may be used, and the aspherical lens may be the seventh lens, which is beneficial to correct system aberrations, improve resolution, and especially reduce large field of view aberrations. The present application does not specifically limit the number of spherical lenses and aspherical lenses. When focusing on the resolution quality, the number of aspherical lenses may be increased. In particular, in order to improve the resolution quality of the optical system, the first to seventh lenses may all be aspherical lenses.

[0065] In an exemplary embodiment, one or more of the first to seventh lenses may have an inflection point. For example, in some embodiments, both the first side surface and the second side surface of the seventh lens may have an inflection point. The inflection is beneficial for balancing the aberration of the central field of view and the edge field of view, and improving the resolution.

[0066] In an exemplary embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens can all be glass lenses. An optical lens made of glass can suppress the deviation of the back focus of the optical lens with temperature changes 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 and resolution quality, the first lens to the seventh lens can all be glass aspherical lenses. In applications where temperature stability requirements are lower, the first lens to the seventh lens in the optical lens can also be made of plastic. Making optical lenses with plastic can effectively reduce production costs. Of course, the first lens to the seventh lens in the optical lens can also be made of a combination of plastic and glass.

[0067] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.03≤(d5+d6) / TTL≤0.2, wherein d5 is the center thickness of the fifth lens on the optical axis, d6 is the center thickness of the sixth lens on the optical axis, and TTL 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. The fifth and sixth lenses may be bonded together to form a double bonded lens. By controlling the conditional expression, the middle thickness of the bonded lens may be appropriately increased within a certain range, which is beneficial to enhancing the light control capability and improving the imaging quality. More specifically, d5, d6, and TTL may further satisfy: 0.09≤(d5+d6) / TTL≤0.16. By controlling the conditional expression within this range, it is more beneficial to enhancing the light control capability of the bonded lens and improving the imaging quality. More specifically, d5, d6, and TTL may further satisfy: 0.1081≤(d5+d6) / TTL≤0.1505, which is more beneficial to enhancing the light control capability of the bonded lens and improving the imaging quality.

[0068] In an exemplary embodiment, the optical lens according to the present application may satisfy: 2≤|F7 / F|, wherein F7 is the effective focal length of the seventh lens, and F is the total effective focal length of the optical lens. The seventh lens has a larger focal length and less light deflection, which is beneficial for the seventh lens to be close to the image plane, and can achieve a smaller back focus, achieve a large image plane, and help to increase the distance from the sixth lens, improve the sensitivity of the system, and improve the imaging quality. It should be noted that the maximum value of |F7 / F| in the present application reaches 34.7521, and the seventh lens has little effect on the trend of light. It is used to receive the light emitted by the cemented part and play a transitional role, so that the seventh lens is close to the image plane, and can achieve a smaller back focus, achieve a large image plane, and help to increase the distance from the sixth lens, improve the sensitivity of the system, and improve the imaging quality. When |F7 / F| tends to infinity, it can also play the same role. In some exemplary embodiments, the absolute value of the effective focal length of the seventh lens may tend to be very large or close to infinity, for example, it may be 300, 500 or 1000, so the range of values ​​of the conditional expression |F7 / F| may also tend to be very large or close to infinity. More specifically, F7 and F may satisfy: 2≤|F7 / F|≤80; and, further, may satisfy: 2.2≤|F7 / F|≤55; by controlling the conditional expression within the above range, it is more conducive to controlling the light trend, so that the seventh lens is close to the image plane, which can better achieve a smaller back focus and a larger image plane, further help to increase the distance from the sixth lens, further improve the sensitivity of the system, and be more conducive to improving the imaging quality. Furthermore, F7 and F may also satisfy: 2.6553≤|F7 / F|≤34.7521, which is more conducive to improving the imaging quality.

[0069] In an exemplary embodiment, the optical lens according to the present application may satisfy: -5≤R4 / R5≤0.8, wherein R4 is the radius of curvature of the second side of the second lens, and R5 is the radius of curvature of the first side of the third lens. By controlling this conditional expression, the light passing through the first and second lenses can be continuously diverged, which is beneficial to increase the incident height of the edge light, reduce distortion, and improve resolution. More specifically, R4 and R5 may further satisfy: -4≤R4 / R5≤0.6. By controlling the conditional expression within this range, it may further help increase the incident height of the edge light, further help reduce distortion, and improve resolution. Furthermore, R4 and R5 may also satisfy: -2.7008≤R4 / R5≤0.3174, which is more beneficial to improve imaging quality.

[0070] In an exemplary embodiment, the optical lens according to the present application may satisfy: -25≤F2 / F≤-2, wherein F2 is the effective focal length of the second lens, and F is the total effective focal length of the optical lens. By controlling this conditional expression, the focal length of the second lens is larger, which is conducive to receiving the light that diverges rapidly in front, so that the light further diverges effectively into the rear optical system, while not diverging excessively to affect the rear port diameter, and is conducive to reducing the system sensitivity and improving the imaging quality. More specifically, F2 and F may further satisfy: -20≤F2 / F≤-2.5. By controlling the conditional expression within this range, it may be more conducive to receiving the light that diverges rapidly in front, so that the light further diverges effectively into the rear optical system and not diverging excessively to affect the rear port diameter, and is more conducive to reducing the system sensitivity and further improving the imaging quality. Furthermore, F2 and F may also satisfy: -14.9343≤F2 / F≤-3.0069, which is more conducive to improving the imaging quality.

[0071] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.06≤d45 / TTL≤0.2, wherein d45 is the air interval between the fourth lens and the fifth lens on the optical axis, and TTL 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. According to the optical lens of the present application, the light begins to converge through the third lens, and the overall convergence trend is shown when it is emitted through the fourth lens. By controlling this conditional expression, the fourth and fifth lenses are arranged with a larger distance, which is conducive to the effective convergence of the light and the reduction of the rear port diameter. At the same time, the light can smoothly transition to the fifth lens, reducing the aberration caused by the continuous convergence of the third and fourth lenses, which is conducive to improving the imaging quality; at the same time, the distance between the fourth and fifth lenses is reasonably set to leave space for the adjustment of the back focus, which can solve the assembly problem on the basis of meeting the miniaturization and achieve high resolution. More specifically, d45 and TTL can further satisfy: 0.07≤d45 / TTL≤0.18. By controlling the conditional formula within this range, it is further beneficial for the light to be effectively converged, reducing the diameter of the back port, and at the same time, the light can be more smoothly transferred to the fifth lens, reducing the aberration caused by the continuous convergence of the third and fourth lenses, which is further beneficial to improving the image quality; at the same time, it can be more beneficial to leave space for the adjustment of the back focus, which is beneficial to solving the assembly problem on the basis of meeting the miniaturization, and further achieving high resolution. Furthermore, d45 and TTL can also satisfy: 0.0806≤d45 / TTL≤0.1501, which is more beneficial to improving the image quality.

[0072] In an exemplary embodiment, the optical lens according to the present application may satisfy: TTL / F≤4.5, wherein TTL is the distance on the optical axis from the center of the first side surface of the first lens to the imaging surface of the optical lens, and F is the total effective focal length of the optical lens. By controlling this conditional expression, the lens length can be effectively limited, which is beneficial to the miniaturization of the lens while taking into account the telephoto. More specifically, TTL and F can further satisfy: 3.5≤TTL / F≤4.3. By controlling the conditional expression within this range, the lens length can be further effectively limited, which is more beneficial to the miniaturization of the lens while taking into account the telephoto. Furthermore, TTL and F can also satisfy: 3.8753≤TTL / F≤4.1300, which is more beneficial to improving the imaging quality on the basis of miniaturization.

[0073] In an exemplary embodiment, the optical lens according to the present application can satisfy: 1.5≤F3 / F≤8, wherein F3 is the effective focal length of the third lens, and F is the total effective focal length of the optical lens. By controlling this conditional expression, the third lens effectively converges the light that continues to diverge in front, has a larger focal length, and a smaller light deflection angle, which is conducive to reducing light sensitivity, while controlling the amount of light passing through and improving imaging quality; this conditional expression is further matched with the conditional expression -25≤F2 / F≤-2, and the focal lengths of the second and third lenses are both large, and the light can be smoothly transferred to the rear lens, reducing the sensitivity of the optical system, which is more conducive to improving imaging quality. More specifically, F3 and F can further satisfy: 1.7≤F3 / F≤6.5. By controlling the conditional expression in this range, it can be further conducive to reducing light sensitivity, while better controlling the amount of light passing through and further improving imaging quality; this conditional expression is matched with the conditional expression -25≤F2 / F≤-2, and the focal lengths of the second and third lenses are both large, and the light can be more smoothly transferred to the rear lens, further reducing the sensitivity of the optical system, which is more conducive to improving imaging quality. Furthermore, F3 and F may also satisfy: 1.8948≤F3 / F≤4.9664, which is more conducive to improving the imaging quality.

[0074] In an exemplary embodiment, the optical lens according to the present application may satisfy: BFL / TTL≤0.15, wherein BFL is the distance from the center of the second side of the seventh lens to the imaging surface of the optical lens on the optical axis, and TTL is the distance from the center of the first side of the first lens to the imaging surface of the optical lens on the optical axis. By controlling this conditional expression, the debugging space of the module is met, the optical back focus BFL of the system is small, the overall length of the lens is compressed, and the miniaturization of the lens can be achieved. More specifically, BFL and TTL may further satisfy: 0.08≤BFL / TTL≤0.13, and by controlling the conditional expression within this range, the miniaturization of the lens may be further achieved. Furthermore, BFL and TTL may also satisfy: 0.0920≤BFL / TTL≤0.1209, which is more conducive to improving imaging quality on the basis of miniaturization.

[0075] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.05≤d67 / TTL≤0.2, wherein d67 is the air interval between the sixth lens and the seventh lens on the optical axis, and TTL is the distance between the center of the first side surface of the first lens and the imaging surface of the optical lens on the optical axis. According to the optical lens of the present application, the light rays are generally in a continuous convergence trend before reaching the sixth lens. By controlling the conditional expression, the interval between the sixth lens and the seventh lens is set to be larger, and the optical path of the reflected light rays between the lenses is increased, which is conducive to the focus point of the ghost image being away from the image plane and reducing the ghost image; at the same time, it is conducive to the smooth transition of the light rays converging in front, achieving light splitting, and with the seventh lens having a larger focal length, further reducing the field curvature and improving the resolution. More specifically, d67 and TTL may further satisfy: 0.06≤d67 / TTL≤0.15. By controlling the conditional expression in this range, it can further facilitate the focus point of the ghost image being away from the image plane and further reducing the ghost image; at the same time, it is more conducive to the smooth transition of the light rays converging in front, achieving light splitting, and with the seventh lens having a larger focal length, it is conducive to further reducing the field curvature and further improving the resolution. Furthermore, d67 and TTL may also satisfy: 0.0710≤d67 / TTL≤0.1247, which is more conducive to improving imaging quality.

[0076] In an exemplary embodiment, the optical lens according to the present application may satisfy: |(HF×θ) / (F×θ)|≤0.1, wherein H is the image height corresponding to the maximum field angle of the optical lens, F is the total effective focal length of the optical lens, and θ is the radian value of the maximum field angle of the optical lens. By controlling this conditional expression, it is ensured that the focal length of the lens is increased while the field angle of the lens and the size of the imaging surface remain unchanged, and the imaging effect of the central area of ​​the lens imaging surface is highlighted. More specifically, H, F and θ may further satisfy: 0.002≤|(HF×θ) / (F×θ)|≤0.08. By controlling the conditional expression within this range, it may be more conducive to ensuring that the focal length of the lens is increased while the field angle of the lens and the size of the imaging surface remain unchanged, and the imaging effect of the central area of ​​the lens imaging surface is highlighted. Furthermore, H, F and θ may also satisfy: 0.0039≤|(HF×θ) / (F×θ)|≤0.0558, which is more conducive to improving the imaging quality.

[0077] In an exemplary embodiment, the optical lens according to the present application may satisfy: -0.5≤R3 / R4≤2, wherein R3 is the radius of curvature of the first side of the second lens, and R4 is the radius of curvature of the second side of the second lens. By controlling this conditional expression, the special lens shape setting of the second lens is conducive to the smooth transition of light trends, reducing the sensitivity of the system and improving performance. More specifically, R3 and R4 may further satisfy: -0.3≤R3 / R4≤1.2. By controlling the conditional expression within this range, it may further facilitate the smooth transition of light trends, further reduce the sensitivity of the system, and further help improve performance. More specifically, R3 and R4 may also satisfy: -0.0605≤R3 / R4≤0.8217, which is more conducive to improving imaging quality.

[0078] In an exemplary embodiment, the optical lens according to the present application may satisfy: 50≤(FOV×F) / H≤75, wherein FOV is the maximum field of view angle of the optical lens, F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum field of view angle of the optical lens. By controlling this conditional expression, telephoto and large field of view imaging can be achieved while satisfying a certain image height. More specifically, FOV, F, and H may further satisfy: 55≤(FOV×F) / H≤65. By controlling the conditional expression within this range, it can be more conducive to achieving telephoto and large field of view imaging while satisfying a certain image height, thereby improving imaging quality. More specifically, FOV, F, and H may further satisfy: 57.0731≤(FOV×F) / H≤60.6826, which is more conducive to improving imaging quality.

[0079] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.1≤D / H / F≤0.25, wherein D is the maximum effective aperture of the first side of the first lens corresponding to the maximum field angle of the optical 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. By controlling this conditional expression and reasonably setting the relationship between the aperture, image height and focal length, the lens can be provided with the characteristics of a large target surface and a small aperture. More specifically, D, H and F can further satisfy: 0.12≤D / H / F≤0.19. By controlling the conditional expression within this range, it can be more conducive to achieving the characteristics of a large target surface, a small aperture and high resolution of the lens. More specifically, D, H and F can also satisfy: 0.1434≤D / H / F≤0.1808, which is more conducive to improving the imaging quality.

[0080] In an exemplary embodiment, the optical lens according to the present application may satisfy: -2.8≤F1 / F≤-1, wherein F1 is the effective focal length of the first lens, and F is the total effective focal length of the optical lens. By controlling this conditional expression, the focal length of the first lens is reasonably allocated, which is conducive to collecting light with a large field angle to enter the optical system. More specifically, F1 and F may further satisfy: -2.2≤F1 / F≤-1.2. By controlling the conditional expression within this range, it may be further conducive to collecting light with a large field angle to enter the optical system. More specifically, F1 and F may also satisfy: -1.9572≤F1 / F≤-1.3275, which is more conducive to improving imaging quality.

[0081] In an exemplary embodiment, the optical lens according to the present application may satisfy: -1≤F / F4≤1.5, wherein F is the total effective focal length of the optical lens, and F4 is the effective focal length of the fourth lens. By controlling this conditional expression, the optical focal length of the fourth lens can be reasonably controlled, which is beneficial to the continuous convergence of the light emitted by the third lens, reducing the diameter of the back port, and achieving short TTL. More specifically, F and F4 may further satisfy: -0.5≤F / F4≤1. By controlling the conditional expression within this range, it is more beneficial to the continuous convergence of the light emitted by the third lens, further reducing the diameter of the back port, and achieving short TTL. More specifically, F and F4 may also satisfy: -0.1922≤F / F4≤0.7230, which is more beneficial to improving imaging quality while taking into account miniaturization.

[0082] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.005≤d2 / TTL≤0.12, wherein d2 is the center thickness of the second lens on the optical axis, and TTL 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. By controlling this conditional expression, the thickness of the second lens can be reasonably controlled, and with its own larger focal length, it is beneficial to shorten the optical path, and more marginal light can be allowed to enter the rear optical system, thereby increasing the light throughput of the optical system. More specifically, d2 and TTL may further satisfy: 0.01≤d2 / TTL≤0.09. By controlling the conditional expression within this range, it can further help shorten the optical path, further allow more marginal light to enter the rear optical system, and further help increase the light throughput of the optical system. More specifically, d2 and TTL may further satisfy: 0.0250≤d2 / TTL≤0.0759, which is more beneficial to improving imaging quality.

[0083] In an exemplary embodiment, the optical lens according to the present application may satisfy: (d23+d34) / TTL≤0.1, wherein d23 is the air gap between the second lens and the third lens on the optical axis, d34 is the air gap between the third lens and the fourth lens on the optical axis, and TTL 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. By controlling this conditional expression, the air gap between the second lens and the third lens and between the third lens and the fourth lens is reduced, so that the front end structure of the optical lens is compact, and sufficient space is left for the rear end lens setting, which is conducive to achieving high resolution on the basis of satisfying miniaturization. More specifically, d23, d34 and TTL may further satisfy: (d23+d34) / TTL≤0.06. By controlling the conditional expression within this range, the front end structure of the optical lens can be further made more compact, and sufficient space is left for the rear end lens setting, which is further conducive to achieving high resolution on the basis of satisfying miniaturization. More specifically, d23, d34 and TTL may also satisfy: 0.0065≤(d23+d34) / TTL≤0.0428, which is more conducive to improving imaging quality while taking into account miniaturization.

[0084] In an exemplary embodiment, the optical lens according to the present application may satisfy: d23 / TTL≤0.08, wherein d23 is the air spacing between the second lens and the third lens on the optical axis, and TTL 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. By controlling this conditional expression, the spacing between the second lens and the third lens is smaller, which is conducive to miniaturization; the second lens and the third lens have one negative and one positive focal length, which is conducive to correcting aberrations and improving resolution. More specifically, d23 and TTL may further satisfy: d23 / TTL≤0.06, which may be further conducive to miniaturization by controlling the conditional expression within this range; the second lens and the third lens have one negative and one positive focal length, which may be more conducive to correcting aberrations and further improving resolution. More specifically, d23 and TTL may also satisfy: 0.0032≤d23 / TTL≤0.0397, which is more conducive to improving imaging quality while taking into account miniaturization.

[0085] In an exemplary embodiment, the optical lens according to the present application may satisfy: d34 / TTL≤0.01, wherein d34 is the air interval between the third lens and the fourth lens on the optical axis, and TTL 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. By controlling the conditional expression, the interval between the third lens and the fourth lens is reduced, which is conducive to the continuous convergence of light and the reduction of light energy loss. While reducing TTL, the light transitions smoothly and the sensitivity is reduced. More specifically, d34 and TTL may further satisfy: d34 / TTL≤0.005. By controlling the conditional expression within this range, it may be more conducive to the continuous convergence of light and the reduction of light energy loss. While reducing TTL, the light transitions more smoothly and the sensitivity is further reduced. More specifically, d34 and TTL may also satisfy: 0.0031≤d34 / TTL≤0.0032, which is more conducive to improving the imaging quality.

[0086] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.7≤F / H≤0.95, wherein F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens. By controlling this conditional expression and setting a suitable relationship between focal length and image height, it is beneficial to improve the imaging clarity of the system and achieve a large image surface. More specifically, F and H may further satisfy: 0.75≤F / H≤0.9. By controlling the conditional expression within this range, it may be more beneficial to improve the imaging clarity of the system and achieve a large image surface. More specifically, F and H may also satisfy: 0.8142≤F / H≤0.8657, which is more beneficial to improve the imaging quality.

[0087] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.5≤R7 / F≤2.5, wherein R7 is the radius of curvature of the first side of the fourth lens, and F is the total effective focal length of the optical lens. By controlling this conditional expression, the object side of the fourth lens is convex, and the radius of curvature is small, and the light is effectively converged into the rear optical system, which is beneficial to reduce the rear port diameter, increase the light throughput, and improve the imaging quality. More specifically, R7 and F may further satisfy: 0.7≤R7 / F≤1.8. By controlling the conditional expression within this range, it is more beneficial for the object side of the fourth lens to effectively converge the light into the rear optical system, which is further beneficial to reduce the rear port diameter, increase the light throughput, and improve the imaging quality. More specifically, R7 and F may further satisfy: 0.9915≤R7 / F≤1.6721, which is more beneficial to improve the imaging quality.

[0088] In an exemplary embodiment, the optical lens according to the present application may satisfy: -3≤R11 / F≤1.5, wherein R11 is the radius of curvature of the second side of the fifth lens, and F is the total effective focal length of the optical lens. By controlling this conditional expression, the ratio of the radius of curvature of the image side of the fifth lens to the focal length of the lens is reasonably controlled within a certain range, which can assist the smooth movement of light, especially the light in the edge field of view, and can better correct aberrations, improve imaging quality and achieve high resolution. More specifically, R11 and F may further satisfy: -2≤R11 / F≤1. By controlling the conditional expression within this range, it can be more conducive to assisting the smooth movement of light, especially the light in the edge field of view, and can better correct aberrations, further improve imaging quality and achieve high resolution. More specifically, R11 and F may also satisfy: -1.5128≤R11 / F≤0.6900, which is more conducive to improving imaging quality.

[0089] In an exemplary embodiment, the optical lens according to the present application may satisfy: -8≤F5 / F6≤-0.1, wherein F5 is the effective focal length of the fifth lens, and F6 is the effective focal length of the sixth lens. The fifth lens and the sixth lens are glued together to form a glued component. By controlling this conditional expression, the focal lengths of the two lenses of the glued component can be reasonably controlled, which is beneficial to correcting chromatic aberration and improving image quality. More specifically, F5 and F6 may further satisfy: -6≤F5 / F6≤-0.2. By controlling the conditional expression within this range, it can be further beneficial to correcting chromatic aberration and improving image quality. More specifically, F5 and F6 may also satisfy: -3.7543≤F5 / F6≤-0.2725, which is more beneficial to improving imaging quality.

[0090] In an exemplary embodiment, the optical lens according to the present application may satisfy: (R1 / D) / (R2 / D2)≤9, wherein R1 is the radius of curvature of the first side of the first lens, D is the maximum effective aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, R2 is the radius of curvature of the second side of the first lens, and D2 is the maximum effective aperture of the second side of the first lens corresponding to the maximum field of view of the optical lens. By controlling this conditional expression, the radius of curvature and aperture of the two surfaces of the first lens are reasonably controlled. When the first lens has a negative optical power, the difference between the two surface radius of curvature values ​​is small and the closer the two surface aperture values ​​are, the less divergence of light can be reduced, which is conducive to lowering the light and making the front port diameter of the lens smaller. More specifically, R1, D, R2 and D2 may further satisfy: 1.25≤(R1 / D) / (R2 / D2)≤7.75. By controlling the conditional expression within this range, it is further conducive to reducing the divergence of light, which is more conducive to lowering the light and further making the front port diameter of the lens smaller. More specifically, R1, D, R2 and D2 may also satisfy: 2.5211≤(R1 / D) / (R2 / D2)≤6.4461, which is more conducive to improving imaging quality while taking into account the small aperture at the front end.

[0091] In an exemplary embodiment, the optical lens according to the present application may satisfy: F / ENPD≤2, where F is the total effective focal length of the optical lens, and ENPD is the entrance pupil diameter of the optical lens. By controlling this conditional expression, a small FNO of the lens is achieved, which is conducive to increasing the amount of light passing through, and a large entrance pupil diameter helps to improve the relative illumination. More specifically, F and ENPD may further satisfy: 1.7≤F / ENPD≤1.9. By controlling the conditional expression within this range, it may be more conducive to increasing the amount of light passing through and further help to improve the relative illumination. More specifically, F and ENPD may also satisfy: 1.8000≤F / ENPD≤1.8200, which is more conducive to improving the imaging quality.

[0092] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1.8≤R1 / F≤8.5, wherein R1 is the radius of curvature of the first side of the first lens, and F is the total effective focal length of the optical lens. By controlling this conditional expression, controlling the radius of curvature of the object side of the first lens can make the pupil image of the ghost image away from the focal plane, so that the ghost image light rays on the image plane are relatively divergent, effectively reducing the relative energy value of the ghost image, and improving the quality of the lens imaging picture. More specifically, R1 and F can further satisfy: 2≤R1 / F≤8. By controlling the conditional expression within this range, it is more conducive to making the pupil image of the ghost image away from the focal plane, so that the ghost image light rays on the image plane are relatively divergent, further effectively reducing the relative energy value of the ghost image, and more conducive to improving the quality of the lens imaging picture. More specifically, R1 and F can also satisfy: 2.2309≤R1 / F≤5.8821, which is more conducive to improving the imaging quality.

[0093] In an exemplary embodiment, the optical lens according to the present application may satisfy: -10≤R6 / R7≤25, wherein R6 is the radius of curvature of the second side of the third lens, and R7 is the radius of curvature of the first side of the fourth lens. By controlling the conditional expression, the radius of curvature of the image side of the third lens and the object side of the fourth lens are reasonably set, which is conducive to more light entering the fourth lens and increasing the light transmission capacity of the system; further, the image side of the third lens is opposite to the object side of the fourth lens, and the light can be effectively converged, reducing the loss of light energy, further reducing the diameter of the back port, and achieving high resolution. More specifically, R6 and R7 may further satisfy: -7≤R6 / R7≤-0.5. By controlling the conditional expression within this range, it can further facilitate more light entering the fourth lens and increasing the light transmission capacity of the system; and the light can be more effectively converged, further reducing the loss of light energy, further reducing the diameter of the back port, and more conducive to achieving high resolution. More specifically, R6 and R7 may also satisfy: -5.5184≤R6 / R7≤17.6805, which is more conducive to improving the imaging quality.

[0094] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.5≤F56 / F≤30, wherein F56 is the combined focal length of the fifth lens and the sixth lens, and F is the total effective focal length of the optical lens. The fifth lens and the sixth lens are bonded to form a bonded component. By controlling the conditional expression and rationally controlling the combined focal length of the bonded component, the trend of light entering the bonded component can be effectively controlled, the aberration caused by the large-angle light entering from the front end can be reduced, and the resolution performance can be improved. More specifically, F56 and F may further satisfy: 0.7≤F56 / F≤24. By controlling the conditional expression within this range, the trend of light entering the bonded component can be more effectively controlled, the aberration caused by the large-angle light entering from the front end can be further reduced, and the resolution performance can be further improved. More specifically, F56 and F may also satisfy: 0.9904≤F56 / F≤19.2509, which is more conducive to improving the imaging quality.

[0095] The optical lens according to the exemplary embodiment of the present application includes seven lenses with optical power, which are the first to seventh lenses arranged in sequence from the first side to the second side along the optical axis, wherein the first lens has negative optical power, and its first side surface is convex, and the second side surface is concave; the second lens has negative optical power, and its first side surface is concave; the third lens has positive optical power; the first side surface of the fourth lens is convex; the fifth lens is cemented with the sixth lens, and the fifth lens and the sixth lens have opposite optical power properties of positive and negative; and the center thickness d5 of the fifth lens on the optical axis and the center thickness d6 of the sixth lens on the optical axis are the same as the center of the first side surface of the first lens to the imaging of the optical lens. The distance TTL between the surfaces on the optical axis satisfies the conditional formula 0.03≤(d5+d6) / TTL≤0.2; the effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy the conditional formula 2≤|F7 / F|; the curvature radius R4 of the second side surface of the second lens and the curvature radius R5 of the first side surface of the third lens satisfy the conditional formula -5≤R4 / R5≤0.8; the effective focal length F2 of the second lens and F satisfy the conditional formula -25≤F2 / F≤-2; the air interval d45 between the fourth lens and the fifth lens on the optical axis and TTL satisfy the conditional formula 0.06≤d45 / TTL≤0.2; TTL and F satisfy the conditional formula TTL / F≤4.5. By setting the lens in this way, the thickness of the cemented lens can be appropriately increased within a certain range, which is conducive to enhancing the ability to control light and improving the image quality; the focal length of the seventh lens is reasonably controlled to be larger and the light deflection is smaller, which is conducive to the seventh lens being close to the image plane, and a smaller back focus can be achieved, and a large image plane can be achieved, which is conducive to increasing the distance from the sixth lens, improving the sensitivity of the system, and improving the image quality; the ratio of the curvature radius of the second side of the second lens to the curvature radius of the first side of the third lens is reasonably controlled to continuously diverge the light passing through the first and second lenses, which is conducive to increasing the incident height of the edge light, reducing distortion, and improving resolution; the focal length of the second lens is reasonably controlled to be larger, which is conducive to receiving the light that diverges rapidly in front, so that the light can be further effectively diverged. The light enters the rear optical system without excessive divergence affecting the rear port diameter, and is also beneficial to reducing the system sensitivity and improving the imaging quality; the light begins to converge through the third lens, and shows an overall convergence trend when emitted through the fourth lens. The larger spacing between the fourth and fifth lenses is beneficial to the effective convergence of the light, reducing the rear port diameter, and the light can smoothly transition to the fifth lens, reducing the aberration caused by the continuous convergence of the third and fourth lenses, which is beneficial to improving the imaging quality; at the same time, the reasonable setting of the spacing between the fourth and fifth lenses can leave space for the adjustment of the back focus, solve the assembly problem on the basis of meeting the miniaturization, and achieve high resolution; and according to the optical lens of the present application, the length of the lens can also be effectively limited, and the lens can achieve miniaturization and telephoto.

[0096] The optical lens according to the exemplary embodiment of the present application adopts a seven-piece lens architecture. By reasonably setting parameters such as the lens optical power, surface shape, curvature radius, center thickness, and air space between lenses, the optical lens can have one or more beneficial effects such as high resolution, low sensitivity, weak ghost images, miniaturization, and high luminous flux, so that the optical lens can better meet the high requirements of, for example, automotive applications.

[0097] However, it should be understood by those skilled in the art that, without departing from the technical solution claimed in the present application, the number of lenses constituting the lens can be changed to obtain the various results and advantages described in this specification. For example, although seven lenses are described as an example in the embodiment, the optical lens is not limited to including seven lenses. If necessary, the optical lens may also include other numbers of lenses. The following further describes specific embodiments of the optical lens applicable to the above-mentioned embodiments with reference to the accompanying drawings. Example 1

[0098] 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.

[0099] like Figure 1 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture STO, a fifth lens L5, a sixth lens L6 and a seventh lens L7 in sequence from the first side to the second side along the optical axis, and also includes, for example, a filter IR, a protective glass CG and an image plane IMA located on the second side of the seventh lens L7.

[0100] The first lens L1 is a convex-concave lens with negative focal 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 focal power, whose first side surface S3 is concave and whose second side surface S4 is convex. The third lens L3 is a convex-convex lens with positive focal power, whose first side surface S5 is convex and whose second side surface S6 is convex. The fourth lens L4 is a convex-concave lens with positive focal power, whose first side surface S7 is convex and whose second side surface S8 is concave. The fifth lens L5 is a convex-concave lens with negative focal power, whose first side surface S10 is convex and whose second side surface S11 is concave. The sixth lens L6 is a convex-convex lens with positive focal power, whose first side surface S11 is convex and whose second side surface S12 is convex. The seventh lens L7 is a convex-concave lens with negative focal power, whose first side surface S13 is concave and whose second side surface S14 is concave.

[0101] In this embodiment, the fifth lens L5 and the sixth lens L6 are cemented to form a doublet lens. The seventh lens L7 is an aspheric lens. The stop STO is located between the fourth lens L4 and the fifth lens L5. The second side surface S14 of the seventh lens L7 has an inflection point.

[0102] In this embodiment, the optical filter IR has, for example, a first side surface S15 and a second side surface S16 ; the protective glass CG has, for example, a first side surface S17 and a second side surface S18 .

[0103] When the optical lens is used for video recording, light from an object can sequentially pass through surfaces S1 to S18 and finally form an image on an imaging surface; when the optical lens is used for projection, light from the light source side can sequentially pass through surfaces S18 to S1 and finally be projected onto a target object (not shown).

[0104] Table 1 shows the radius of curvature R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 1. Wherein, regarding "thickness / distance", it should be understood that the thickness / distance of the row where S1 is located is the center thickness of the first lens L1, the thickness / distance of the row where S2 is located is the air spacing distance between the first lens L1 and the second lens L2, the thickness / distance of the row where S3 is located is the center thickness of the second lens L2, the thickness / distance of the row where S4 is located is the air spacing distance between the second lens L2 and the third lens L3, and so on.

[0105] Table 1

[0106] In this embodiment, the first side surface S13 and the second side surface S14 of the seventh lens L7 are aspherical surfaces. The surface shape of the aspherical lens can be defined by but not limited to the following aspherical surface formula: (1) Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is 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 curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12, A14, and A16 of the aspheric mirror surfaces S13-S14 that can be used in Example 1.

[0107] Table 2 Example 2

[0108] Figure 2The structure diagram of the optical lens according to Embodiment 2 of the present application is shown. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted.

[0109] The difference from Example 1 is that, in this embodiment, the third lens L3 is a concave-convex lens with positive focal power, and its first side surface S5 is a concave surface, and its second side surface S6 is a convex surface. The fifth lens L5 is a convex-convex lens with positive focal power, and its first side surface S10 is a convex surface, and its second side surface S11 is a convex surface. The sixth lens L6 is a concave-concave lens with negative focal power, and its first side surface S11 is a concave surface, and its second side surface S12 is a concave surface. The seventh lens L7 is a convex-concave lens with negative focal power, and its first side surface S13 is a convex surface, and its second side surface S14 is a concave surface. In this embodiment, the first side surface S13 and the second side surface S14 of the seventh lens L7 both have an inflection point.

[0110] Table 3 shows the basic parameters of the optical lens of Example 2. Table 4 shows the cone coefficients and high-order coefficients of each aspherical mirror surface S13-S14 that can be used in this embodiment, wherein each aspherical surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0111] Table 3

[0112] Table 4 Example 3

[0113] Figure 3 A schematic structural diagram of an optical lens according to Example 3 of the present application is shown.

[0114] The difference from Example 1 is that, in this embodiment, the second lens L2 is a concave-concave lens with negative focal power, and its first side surface S3 is concave, and its second side surface S4 is concave. The third lens L3 is a concave-convex lens with positive focal power, and its first side surface S5 is concave, and its second side surface S6 is convex. The fifth lens L5 is a convex-convex lens with positive focal power, and its first side surface S10 is convex, and its second side surface S11 is convex. The sixth lens L6 is a concave-concave lens with negative focal power, and its first side surface S11 is concave, and its second side surface S12 is concave. The seventh lens L7 is a convex-concave lens with positive focal power, and its first side surface S13 is convex, and its second side surface S14 is concave.

[0115] Table 5 shows the basic parameters of the optical lens of Example 3. Tables 6 and 7 show the cone coefficients and high-order coefficients that can be used for each aspherical mirror surface S13-S14 in this embodiment.

[0116] Table 5

[0117] Table 6

[0118] Table 7 Example 4

[0119] Figure 4 A schematic structural diagram of an optical lens according to Example 4 of the present application is shown.

[0120] The difference from Example 1 is that in this embodiment, the fourth lens L4 is a convex-planar lens with positive power, the first side surface S7 of which is a convex surface, and the second side surface S8 is a plane surface. The fifth lens L5 is a convex-convex lens with positive power, the first side surface S10 of which is a convex surface, and the second side surface S11 of which is a convex surface. The sixth lens L6 is a meniscus lens with negative power, the first side surface S11 of which is a concave surface, and the second side surface S12 of which is a convex surface.

[0121] Table 8 shows the basic parameters of the optical lens of Example 4. Table 9 shows the cone coefficients and high-order coefficients that can be used for each aspherical mirror surface S13-S14 in this embodiment.

[0122] Table 8

[0123] Table 9 Example 5

[0124] Figure 5 A schematic structural diagram of an optical lens according to Example 5 of the present application is shown.

[0125] The difference from Example 1 is that, in this embodiment, the third lens L3 is a convex-concave lens with positive focal power, and its first side surface S5 is a convex surface, and its second side surface S6 is a concave surface. The fourth lens L4 is a convex-convex lens with positive focal power, and its first side surface S7 is a convex surface, and its second side surface S8 is a convex surface. The fifth lens L5 is a convex-convex lens with positive focal power, and its first side surface S10 is a convex surface, and its second side surface S11 is a convex surface. The sixth lens L6 is a convex-concave lens with negative focal power, and its first side surface S11 is a concave surface, and its second side surface S12 is a convex surface. The seventh lens L7 is a convex-concave lens with negative focal power, and its first side surface S13 is a convex surface, and its second side surface S14 is a concave surface. In this embodiment, the first side surface S13 and the second side surface S14 of the seventh lens L7 both have an inflection point.

[0126] Table 10 shows the basic parameters of the optical lens of Example 5. Table 11 shows the cone coefficients and high-order coefficients that can be used for each aspherical mirror surface S13-S14 in this embodiment.

[0127] Table 10

[0128] Table 11 Example 6

[0129] Figure 6 A schematic structural diagram of an optical lens according to Example 6 of the present application is shown.

[0130] The difference from Example 1 is that in this embodiment, the fourth lens L4 is a convex-concave lens with negative power, the first side surface S7 of which is a convex surface, and the second side surface S8 is a concave surface. The fifth lens L5 is a convex-convex lens with positive power, the first side surface S10 of which is a convex surface, and the second side surface S11 of which is a convex surface. The sixth lens L6 is a convex-concave lens with negative power, the first side surface S11 of which is a concave surface, and the second side surface S12 of which is a convex surface.

[0131] Table 12 shows the basic parameters of the optical lens of Example 6. Table 13 shows the cone coefficients and high-order coefficients that can be used for each aspherical mirror surface S13-S14 in this embodiment.

[0132] Table 12

[0133] Table 13 Example 7

[0134] Figure 7 A schematic structural diagram of an optical lens according to Example 7 of the present application is shown.

[0135] The difference from Example 1 is that in this embodiment, the fourth lens L4 is a convex-convex lens with positive power, the first side surface S7 of which is a convex surface, and the second side surface S8 is a convex surface. The fifth lens L5 is a convex-convex lens with positive power, the first side surface S10 of which is a convex surface, and the second side surface S11 of which is a convex surface. The sixth lens L6 is a meniscus lens with negative power, the first side surface S11 of which is a concave surface, and the second side surface S12 of which is a convex surface.

[0136] Table 14 shows the basic parameters of the optical lens of Example 7. Table 15 shows the cone coefficients and high-order coefficients that can be used for each aspherical mirror surface S13-S14 in this embodiment.

[0137] Table 14

[0138] Table 15 Example 8

[0139] Figure 8 A schematic structural diagram of an optical lens according to Example 8 of the present application is shown.

[0140] The difference from Example 1 is that, in this embodiment, the third lens L3 is a meniscus lens with positive power, the first side surface S5 of which is concave, and the second side surface S6 is convex. The fifth lens L5 is a meniscus lens with positive power, the first side surface S10 of which is convex, and the second side surface S11 of which is convex. The sixth lens L6 is a meniscus lens with negative power, the first side surface S11 of which is concave, and the second side surface S12 of which is convex. In this embodiment, the first side surface S13 and the second side surface S14 of the seventh lens L7 both have an inflection point.

[0141] Table 16 shows the basic parameters of the optical lens of Example 8. Table 17 shows the cone coefficients and high-order coefficients that can be used for each aspherical mirror surface S13-S14 in this embodiment.

[0142] Table 16

[0143] Table 17 Example 9

[0144] Fig. 9 A schematic structural diagram of an optical lens according to Example 9 of the present application is shown.

[0145] The difference from Example 1 is that, in this embodiment, the third lens L3 is a meniscus lens with positive power, the first side surface S5 of which is concave, and the second side surface S6 is convex. The fifth lens L5 is a meniscus lens with positive power, the first side surface S10 of which is convex, and the second side surface S11 of which is convex. The sixth lens L6 is a meniscus lens with negative power, the first side surface S11 of which is concave, and the second side surface S12 of which is convex. The seventh lens L7 is a meniscus lens with negative power, the first side surface S13 of which is concave, and the second side surface S14 of which is convex.

[0146] Table 18 shows the basic parameters of the optical lens of Example 9. Table 19 shows the cone coefficients and high-order coefficients that can be used for each aspherical mirror surface S13-S14 in this embodiment.

[0147] Table 18

[0148] Table 19 Example 10

[0149] Fig.10 A schematic structural diagram of an optical lens according to Example 10 of the present application is shown.

[0150] The difference from Example 1 is that, in this embodiment, the third lens L3 is a concave-convex lens with positive focal power, and its first side surface S5 is a concave surface, and its second side surface S6 is a convex surface. The fifth lens L5 is a convex-convex lens with positive focal power, and its first side surface S10 is a convex surface, and its second side surface S11 is a convex surface. The sixth lens L6 is a concave-concave lens with negative focal power, and its first side surface S11 is a concave surface, and its second side surface S12 is a concave surface. The seventh lens L7 is a convex-concave lens with positive focal power, and its first side surface S13 is a convex surface, and its second side surface S14 is a concave surface. In this embodiment, the first side surface S13 and the second side surface S14 of the seventh lens L7 both have an inflection point.

[0151] Table 20 shows the basic parameters of the optical lens of Example 10. Table 21 shows the cone coefficients and high-order coefficients that can be used for each aspherical mirror surface S13-S14 in this embodiment.

[0152] Table 20

[0153] Table 21 Embodiment 11

[0154] Fig.11 A schematic structural diagram of an optical lens according to Example 11 of the present application is shown.

[0155] The difference from Example 1 is that, in this embodiment, the third lens L3 is a concave-convex lens with positive focal power, and its first side surface S5 is a concave surface, and its second side surface S6 is a convex surface. The fifth lens L5 is a convex-convex lens with positive focal power, and its first side surface S10 is a convex surface, and its second side surface S11 is a convex surface. The sixth lens L6 is a concave-convex lens with negative focal power, and its first side surface S11 is a concave surface, and its second side surface S12 is a convex surface. The seventh lens L7 is a convex-concave lens with negative focal power, and its first side surface S13 is a convex surface, and its second side surface S14 is a concave surface. In this embodiment, the first side surface S13 and the second side surface S14 of the seventh lens L7 both have an inflection point.

[0156] Table 22 shows the basic parameters of the optical lens of Example 11. Table 23 shows the cone coefficients and high-order coefficients that can be used for each aspherical mirror surface S13-S14 in this embodiment.

[0157] Table 22

[0158] Table 23 Example 12

[0159] Fig.12 A schematic structural diagram of an optical lens according to Example 12 of the present application is shown.

[0160] The difference from Example 1 is that in this embodiment, the fourth lens L4 is a convex-convex lens with positive power, the first side surface S7 of which is a convex surface, and the second side surface S8 is a convex surface. The seventh lens L7 is a meniscus lens with positive power, the first side surface S13 of which is a concave surface, and the second side surface S14 of which is a convex surface.

[0161] Table 24 shows the basic parameters of the optical lens of Example 12. Table 25 shows the cone coefficients and high-order coefficients that can be used for each aspherical mirror surface S13-S14 in this embodiment.

[0162] Table 24

[0163] Table 25 Embodiment 13

[0164] Fig.13 A schematic structural diagram of an optical lens according to Example 13 of the present application is shown.

[0165] The difference from Embodiment 1 is that in this embodiment, the fourth lens L4 is a convex-concave lens with negative optical power, and its first side surface S7 is a convex surface, and its second side surface S8 is a concave surface.

[0166] Table 26 shows the basic parameters of the optical lens of Example 13. Table 27 shows the cone coefficients and high-order coefficients that can be used for each aspherical mirror surface S13-S14 in this embodiment.

[0167] Table 26

[0168] Table 27

[0169] According to the optical lens of each embodiment of the present application, a high resolution effect can be achieved. Specifically, each embodiment can meet the high resolution capability of 8M (eight million) pixels, for example. Taking the optical lens of embodiment 1 as an example, Fig.14 The MTF diagram of the optical lens according to Example 1 of the present application is shown. MTF (Modulation Transfer Function) describes the ability of the optical system to "restore" the object space on the image space. Fig.14It can be seen that the MTF value of the central field of view of the optical lens according to Example 1 can exceed 0.71 at a spatial frequency of 119.00 lp / mm (119.00 line pairs / mm), and the optical lens provided in Example 1 has a relatively high resolution.

[0170] It should be noted that the optical lenses provided in Examples 1 to 13 of the present application can all achieve good imaging quality, and their MTF (modulation transfer function) curve diagrams are relatively close. Therefore, the present application only exemplarily shows the MTF (modulation transfer function) curve diagram of the optical lens of Example 1, and the MTF (modulation transfer function) curve diagrams of the optical lenses of other embodiments are no longer shown one by one, and those skilled in the art should be able to know them based on the contents disclosed in this application.

[0171] In summary, the parameter values ​​in Examples 1 to 13 are respectively shown in Tables 26 and 27 below, wherein the units of F, F1-F7, F56, H, D, ENPD, BFL, TTL, D, and D2 are all millimeters (mm), the unit of FOV is degrees (°), and the unit of θ is radians.

[0172] Table 26

[0173] Table 27

[0174] And, Examples 1 to 13 respectively satisfy the relationships shown in Tables 28 and 29 below.

[0175] Table 28

[0176] Table 29

[0177] The present application also provides an electronic device, which may include an optical lens according to the above-mentioned 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 an independent electronic device such as a detection distance camera, or an imaging module integrated in a device such as a detection distance device. In addition, the electronic device may also be an independent imaging device such as a vehicle-mounted camera, or an imaging module integrated in a driving assistance system such as a vehicle-mounted camera.

[0178] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other to form a technical solution.

Claims

1. An optical lens, characterized in that: The optical lens includes, 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 of the second lens is concave; a third lens having positive refractive power; a fourth lens having optical power, wherein the first side surface of the fourth lens is convex; a fifth lens having optical power; a sixth lens having optical power; and a seventh lens having optical power; The fifth lens is glued to the sixth lens, and the fifth lens and the sixth lens have opposite positive and negative optical power properties; The number of lenses having optical power in the optical lens is seven; The optical lens meets the following requirements: 0.03≤(d5+d6) / TTL≤0.2; 2≤|F7 / F|; -5≤R4 / R5≤0.8; -25≤F2 / F≤-2; 0.06≤d45 / TTL≤0.2; and TTL / F≤4.5; Among them, d5 is the center thickness of the fifth lens on the optical axis, d6 is the center thickness of the sixth lens on the optical axis, TTL 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, F7 is the effective focal length of the seventh lens, F is the total effective focal length of the optical lens, R4 is the curvature radius of the second side surface of the second lens, R5 is the curvature radius of the first side surface of the third lens, F2 is the effective focal length of the second lens, and d45 is the air gap between the fourth lens and the fifth lens on the optical axis.

2. The optical lens according to claim 1, characterized in that: The effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: 1.5≤F3 / F≤8.

3. The optical lens according to claim 1, characterized in that: A distance BFL from the center of the second side surface of the seventh lens to the imaging surface of the optical lens on the optical axis and a distance TTL from the center of the first side surface of the first lens to the imaging surface on the optical axis satisfy: BFL / TTL≤0.

15.

4. The optical lens according to claim 1, characterized in that: An air gap d67 between the sixth lens and the seventh lens on the optical axis and a distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: 0.05≤d67 / TTL≤0.

2.

5. The optical lens according to claim 1, characterized in that: The image height H corresponding to the maximum field angle of the optical lens, the total effective focal length F of the optical lens and the arc value θ of the maximum field angle of the optical lens satisfy: |(HF×θ) / (F×θ)|≤0.

1.

6. The optical lens according to claim 1, characterized in that: A curvature radius R3 of the first side surface of the second lens and a curvature radius R4 of the second side surface of the second lens satisfy: -0.5≤R3 / R4≤2.

7. The optical lens according to claim 1, characterized in that: 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: 50≤(FOV×F) / H≤75.

8. The optical lens according to claim 1, characterized in that: The maximum effective light aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the total effective focal length F of the optical lens satisfy: 0.1≤D / H / F≤0.

25.

9. The optical lens according to claim 1, characterized in that: The effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy: -2.8≤F1 / F≤-1.

10. The optical lens according to claim 1, characterized in that: The total effective focal length F of the optical lens and the effective focal length F4 of the fourth lens satisfy: -1≤F / F4≤1.

5.

11. The optical lens according to claim 1, characterized in that: The center thickness d2 of the second lens on the optical axis and the distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: 0.005≤d2 / TTL≤0.

12.

12. The optical lens according to claim 1, characterized in that: The air gap d23 between the second lens and the third lens on the optical axis, the air gap d34 between the third lens and the fourth lens on the optical axis, and the distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: (d23+d34) / TTL≤0.

1.

13. The optical lens according to claim 1, characterized in that: An air gap d23 between the second lens and the third lens on the optical axis and a distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: d23 / TTL≤0.

08.

14. The optical lens according to claim 1, characterized in that: An air gap d34 between the third lens and the fourth lens on the optical axis and a distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: d34 / TTL≤0.

01.

15. The optical lens according to claim 1, characterized in that: The total effective focal length F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy the following: 0.7≤F / H≤0.

95.

16. The optical lens according to claim 1, characterized in that: The curvature radius R7 of the first side surface of the fourth lens and the total effective focal length F of the optical lens satisfy: 0.5≤R7 / F≤2.

5.

17. The optical lens according to claim 1, characterized in that: The optical lens meets at least one of the following conditions: -3≤R11 / F≤1.5; -8≤F5 / F6≤-0.1; (R1 / D) / (R2 / D2)≤9; F / ENPD≤2; 1.8≤R1 / F≤8.5; -10≤R6 / R7≤25; 0.5≤F56 / F≤30; Among them, R11 is the curvature radius of the second side surface of the fifth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, R1 is the curvature radius of the first side surface of the first lens, R2 is the curvature radius of the second side surface of the first lens, D is the maximum effective light-clearance diameter of the first side surface of the first lens corresponding to the maximum field of view of the optical lens, D2 is the maximum effective light-clearance diameter of the second side surface of the first lens corresponding to the maximum field of view of the optical lens, ENPD is the entrance pupil diameter of the optical lens, R6 is the curvature radius of the second side surface of the third lens, R7 is the curvature radius of the first side surface of the fourth lens, and F56 is the combined focal length of the fifth lens and the sixth lens.

18. The optical lens according to claim 1, characterized in that: The optical lens meets at least one of the following conditions: 0.09≤(d5+d6) / TTL≤0.16; 2≤|F7 / F|≤80; 2.2≤|F7 / F|≤55; -4≤R4 / R5≤0.6; -20≤F2 / F≤-2.5; 0.07≤d45 / TTL≤0.18; 3.5≤TTL / F≤4.3; 1.7≤ F3 / F≤6.5; 0.08≤BFL / TTL≤0.13; 0.06≤d67 / TTL≤0.15; 0.002≤|(HF×θ) / (F×θ)|≤0.08; -0.3≤R3 / R4≤1.2; 55≤(FOV×F) / H≤65; 0.12≤D / H / F ≤0.19; -2.2≤F1 / F≤-1.2; -0.5≤F / F4≤1; 0.01≤d2 / TTL≤0.09; (d23+d34) / TTL≤0.06; d23 / TTL≤0.06; d34 / TTL≤0.005; 0.75≤F / H≤0.9; 0. 7≤R7 / F≤1.8; -2≤R11 / F≤1; -6≤F5 / F6≤-0.2; 1.25≤(R1 / D) / (R2 / D2)≤7.75; 1.7≤F / ENPD≤1.9; 2≤R1 / F≤8; -7≤R6 / R7≤-0.5; 0.7≤F56 / F≤24; Wherein, F3 is the effective focal length of the third lens, BFL is the distance from the center of the second side surface of the seventh lens to the imaging surface of the optical lens on the optical axis, d67 is the air interval between the sixth lens and the seventh lens on the optical axis, H is the image height corresponding to the maximum field of view angle of the optical lens, θ is the radian value of the maximum field of view angle of the optical lens, R3 is the curvature radius of the first side surface of the second lens, FOV is the maximum field of view angle of the optical lens, D is the maximum effective aperture of the first side surface of the first lens corresponding to the maximum field of view angle of the optical lens, F1 is the effective focal length of the first lens, F4 is the effective focal length of the fourth lens, d2 is the center thickness of the second lens on the optical axis, and d23 is the thickness of the second lens. The air gap between the third lens and the fourth lens on the optical axis, d34 is the air gap between the third lens and the fourth lens on the optical axis, R7 is the curvature radius of the first side surface of the fourth lens, R11 is the curvature radius of the second side surface of the fifth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, R1 is the curvature radius of the first side surface of the first lens, R2 is the curvature radius of the second side surface of the first lens, D2 is the maximum effective clear aperture of the second side surface of the first lens corresponding to the maximum field of view of the optical lens, ENPD is the entrance pupil diameter of the optical lens, R6 is the curvature radius of the second side surface of the third lens, and F56 is the combined focal length of the fifth lens and the sixth lens.

19. The optical lens according to claim 1, characterized in that: The optical lens meets at least one of the following conditions: 0.1081≤(d5+d6) / TTL≤0.1505;2.6553≤|F7 / F|≤34.7521;-2.7008≤R4 / R5≤0.3174;-14.9343≤F2 / F≤-3.0069;0.0806≤d45 / TTL≤0.1501;3.8753≤TTL / F≤4.1300;1.8948≤F3 / F≤4.9664;0.0920≤BFL / TTL≤0.1209;0.0710≤d67 / TTL≤0.1247;0.0039≤|(H-F×θ) / (F×θ)|≤0.0558;-0.0605≤R3 / R4≤0.8217;57.0731≤(FOV×F) / H≤60.6826;0.1434≤D / H / F≤0.1808;-1.9572≤F1 / F≤-1.3275;-0.1922≤F / F4≤0.7230;0.0250≤d2 / TTL≤0.0759;0.0065≤(d23+d34) / TTL≤0.0428;0.0032≤d23 / TTL≤0.0397;0.0031≤d34 / TTL≤0.0032;0.8142≤F / H≤0.8657; 0.9915≤R7 / F≤1.6721;-1.5128≤R11 / F≤0.6900;-3.7543≤F5 / F6≤-0.2725;2.5211≤(R1 / D) / (R2 / D2)≤6.4461;1.8000≤F / ENPD≤1.8200;2.2309≤R1 / F≤5.8821;-5.5184≤R6 / R7≤17.6805;0.9904≤F56 / F≤19.2509; Wherein, F3 is the effective focal length of the third lens, BFL is the distance from the center of the second side surface of the seventh lens to the imaging surface of the optical lens on the optical axis, d67 is the air interval between the sixth lens and the seventh lens on the optical axis, H is the image height corresponding to the maximum field of view angle of the optical lens, θ is the radian value of the maximum field of view angle of the optical lens, R3 is the curvature radius of the first side surface of the second lens, FOV is the maximum field of view angle of the optical lens, D is the maximum effective aperture of the first side surface of the first lens corresponding to the maximum field of view angle of the optical lens, F1 is the effective focal length of the first lens, F4 is the effective focal length of the fourth lens, d2 is the center thickness of the second lens on the optical axis, and d23 is the thickness of the second lens. The air gap between the third lens and the fourth lens on the optical axis, d34 is the air gap between the third lens and the fourth lens on the optical axis, R7 is the curvature radius of the first side surface of the fourth lens, R11 is the curvature radius of the second side surface of the fifth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, R1 is the curvature radius of the first side surface of the first lens, R2 is the curvature radius of the second side surface of the first lens, D2 is the maximum effective clear aperture of the second side surface of the first lens corresponding to the maximum field of view of the optical lens, ENPD is the entrance pupil diameter of the optical lens, R6 is the curvature radius of the second side surface of the third lens, and F56 is the combined focal length of the fifth lens and the sixth lens.

20. An electronic device, characterized in that: comprising the optical lens according to any one of claims 1 to 19, and It also includes an imaging element for converting the optical image or optical information formed by the optical lens into an electrical signal, wherein the imaging element is located on the second side of the optical lens, and the light from the first side forms an image on the second side after passing through the optical lens; Alternatively, it further includes a light source, which is located on the second side of the optical lens, and the light emitted by the light source is projected to the first side of the optical lens after passing through the optical lens, forming an image or illuminating an area on the first side.

Images