Optical Lens and Electronic Device

Abstract

The present application discloses an optical lens and an electronic device. The optical lens includes a first to a seventh lens arranged in sequence from a first side to a second side along the optical axis. The first lens has a negative optical power and a convex-concave surface shape. The second lens has a negative optical power and a concave first side surface. The third lens has a positive optical power. The first side surface of the fourth lens is convex. The fifth and sixth lenses are cemented and have optical powers with opposite signs. The lens satisfies the 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 central thicknesses of the fifth and sixth lenses respectively, TTL is the overall 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 radii of curvature 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 air gap between the fourth and fifth lenses.

Description

Technical Field

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

[0002] With the continuous development of automotive intelligence and autonomous driving technologies, the market for in-vehicle lenses has been continuously growing. In the next few years, the number of in-vehicle lenses will increase significantly to meet the requirements of higher-level autonomous driving functions and safety. Among them, front-view and side-view cameras, as key components for realizing ADAS (Advanced Driving Assistance System), have particularly strong market demand.

[0003] Due to the complex situation of actual road detection, the lens needs to have good object recognition ability, so the imaging quality requirements for the lens itself are relatively high. And to adapt to more diverse application scenarios, high resolution has gradually become an urgent need. On the basis of meeting the imaging requirements of in-vehicle lenses, the smaller the lens, the more convenient for the installation of in-vehicle lenses. However, this will lead to a contradiction between the resolution and miniaturization of ordinary in-vehicle lenses. The reduction of the overall size of in-vehicle lenses also affects the amount of light flux entering the lens at the same time. The reduction of light flux will affect the illuminance, and then lead to a darker captured image, unable to meet the market demand. In addition, in-vehicle lenses applied to assisted driving should minimize ghost images and stray light to avoid serious 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. For example, existing optical lenses often cannot meet the requirements of high resolution and miniaturization at the same time; existing optical lenses generally have weak light-passing ability and cannot meet the needs in low-light environments such as at night; and in terms of ghost images, existing optical lenses still cannot meet the current requirement of weak ghost images. Therefore, having some or all of the performance characteristics such as high resolution, low sensitivity, weak ghost images, miniaturization, and high light flux has become the main development direction of current in-vehicle lenses. Summary of the Invention

[0005] The present application provides an optical lens. The optical lens may sequentially include, along the optical axis from the first side to the second side: a first lens with a negative optical power, whose first side is convex and the second side is concave; a second lens with a negative optical power, whose first side is concave; a third lens with a positive optical power; a fourth lens with an optical power, whose first side is convex; a fifth lens with an optical power; a sixth lens with an optical power; and a seventh lens with an optical power. Wherein, the fifth lens and the sixth lens are cemented, and the fifth lens and the sixth lens have optical power attributes with opposite signs. The number of lenses with optical power in the optical lens is seven. The optical lens can satisfy the 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. Wherein, d5 is the central thickness of the fifth lens on the optical axis, d6 is the central thickness of the sixth lens on the optical axis, 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, 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 of the second lens, R5 is the curvature radius of the first side 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.

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

[0008] In one embodiment, the air gap d67 between the sixth lens and the seventh lens on the optical axis and the distance TTL from the center of the first side 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 of view angle of the optical lens, the total effective focal length F of the optical lens, and the radian value θ of the maximum field of view angle of the optical lens may satisfy: |(H - F×θ) / (F×θ)| ≤ 0.1.

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

[0011] In one embodiment, the maximum field of view angle 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 angle of the optical lens satisfy: 50 ≤ (FOV × F) / H ≤ 75.

[0012] In one embodiment, the maximum effective aperture D of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the total effective focal length F of the optical lens 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 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 satisfy: -1 ≤ F / F4 ≤ 1.5.

[0015] In one embodiment, the central thickness d2 of the second lens on the optical axis and the distance TTL from the center of the first side of the first lens to the imaging surface of the optical lens on the optical axis 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 of the first lens to the imaging surface of the optical lens on the optical axis satisfy: (d23 + d34) / TTL ≤ 0.1.

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

[0018] In one embodiment, 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 of the first lens to the imaging surface of the optical lens on the optical axis 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 of view angle of the optical lens satisfy: 0.7 ≤ F / H ≤ 0.95.

[0020] In one embodiment, the radius of curvature R7 of the first side of the fourth lens and the total effective focal length F of the optical lens 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; where R11 is the radius of curvature of the second 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 surface of the first lens, R2 is the radius of curvature of the second surface of the first lens, D2 is the maximum effective aperture of the second surface of the first lens corresponding to the maximum field of view angle of the optical lens, ENPD is the entrance pupil diameter of the optical lens, R6 is the radius of curvature of the second surface of the third lens, F56 is the combined focal length of the fifth lens and the sixth lens, and the meanings of the other 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 ≤ |(H - F×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; where 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; 1.8948 ≤ 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, the meanings of the parameters are the same as above.

[0024] On the other hand, this application provides an electronic device, which includes the optical lens provided by this application and an imaging element for converting the optical image or optical information formed by the optical lens into an electrical signal. 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, the electronic device includes the optical lens provided by this application and a light source. The light source is located on the second side of the optical lens, and the light emitted by the light source projects 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.

[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 an exemplary embodiment of the present application adopts a seven - lens - element lens architecture. By reasonably setting parameters such as the lens optical power, surface shape, radius of curvature, central thickness, and air gap between lenses, it is beneficial for the optical lens to have one or more beneficial effects such as high resolution, low sensitivity, weak ghost images, miniaturization, and high luminous flux, enabling the optical lens to better meet the high requirements of, for example, in - vehicle applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Combined with the drawings, through the detailed description of the following embodiments, other features, objectives, and advantages of the present application will become more obvious. In the drawings:

[0028] Figure 1 FIG. is a schematic structural diagram of the optical lens according to Embodiment 1 of the present application;

[0029] Figure 2 FIG. is a schematic structural diagram of the optical lens according to Embodiment 2 of the present application;

[0030] Figure 3 FIG. is a schematic structural diagram of the optical lens according to Embodiment 3 of the present application;

[0031] Figure 4 FIG. is a schematic structural diagram of the optical lens according to Embodiment 4 of the present application;

[0032] Figure 5 FIG. is a schematic structural diagram of the optical lens according to Embodiment 5 of the present application;

[0033] Figure 6 FIG. is a schematic structural diagram of the optical lens according to Embodiment 6 of the present application;

[0034] Figure 7 FIG. is a schematic structural diagram of the optical lens according to Embodiment 7 of the present application;

[0035] Figure 8 FIG. is a schematic structural diagram of the optical lens according to Embodiment 8 of the present application;

[0036] Figure 9 FIG. is a schematic structural diagram of the optical lens according to Embodiment 9 of the present application;

[0037] Figure 10 FIG. is a schematic structural diagram of the optical lens according to Embodiment 10 of the present application;

[0038] Figure 11 FIG. is a schematic structural diagram of the optical lens according to Embodiment 11 of the present application;

[0039] Figure 12 FIG. is a schematic structural diagram of the optical lens according to Embodiment 12 of the present application;

[0040] Figure 13 Schematic structural diagram of an optical lens according to Embodiment 13 of the present application;

[0041] Figure 14 MTF graph of the optical lens according to Embodiment 1 of the present application. Detailed implementation manners

[0042] 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 the exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0043] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature and do not represent any limitation on the features. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0044] In the drawings, for the sake of convenience of illustration, the thickness, size, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only for illustration and are not drawn strictly to scale.

[0045] 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 object is called the object side surface of the lens, and the surface of each lens closest to the imaging side is called the image side surface of the lens.

[0046] It should be understood that the optical lens provided by the present application can be used for photography, projection, and lidar lenses. When the optical lens provided by the present application is used for a camera lens or the receiving end lens of lidar, the camera lens can be, for example, a vehicle-mounted camera, an infrared camera, a drone camera, a night vision camera, a security surveillance camera, etc. In this article, the "first side" involved can refer to the object side, 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 by the present application is used for a projection lens or the transmitting end lens of radar, the "first side" involved in this article can refer to the object side, the "second side" can refer to the light source side, and the light from the light source side passes through the optical lens and is projected onto the first side, and an image or an illuminated area is formed on the first side.

[0047] It should also be understood that the terms "comprise", "comprising", "have", "including" and / or "containing", when used in this specification, denote the presence of the stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than individual elements in the list. In addition, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0048] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formalized sense unless expressly so defined herein.

[0049] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0050] The features, principles and other aspects of the present application will be described in detail below.

[0051] 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. These seven lenses may be arranged in sequence along the optical axis from the first side to the second side.

[0052] 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. Correspondingly, the first side surfaces of the first lens, the second lens, the third lens, the fourth lens and the fifth lens may be the object side surfaces of the respective lenses, and the second side surfaces of the respective lenses may be the image side surfaces of the respective lenses.

[0053] 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 device (CMOS).

[0054] In an exemplary embodiment, if necessary, 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. The filter can filter light rays with specific wavelengths, and the protective glass can prevent the second-side elements (such as chips) of the optical lens from being damaged.

[0055] In this document, the central 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 central 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. Additionally, in this document, 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 among the two adjacent lenses to the center of the first side surface of the lens closer to the second side among the two adjacent lenses. 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.

[0056] In an exemplary embodiment, the first lens may have a negative optical power. The first lens may have a convex-concave surface type. The first lens having a negative optical power has a diverging effect on the light rays passing through it. Under the condition of the same field of view angle, the light rays emerging from the image side of the first lens can enable the subsequent optical system to have a larger light receiving surface; the first lens can preferably use a lens material with a high refractive index, which is beneficial to reducing the front aperture and improving the imaging quality. The object side surface of the first lens is designed as a convex surface, which can collect as much large-field light as possible and enter the rear optical system. Moreover, in actual use environments such as rainy or snowy weather, it is beneficial for water droplets, etc. to slide off, reducing the impact on imaging. The image side surface of the first lens is a concave surface, which can quickly diverge the large-angle light rays passing through the object side surface of the first lens, facilitating the aberration correction of the large-angle light rays by the rear optical system and achieving high resolution.

[0057] In an exemplary embodiment, the second lens may have a negative optical power. The second lens may have a concave-concave surface type. The second lens has a negative optical power and has a diverging effect on light rays, capable of dispersing the central rays and marginal rays of each field of view, expanding the light aperture at the rear, increasing the system illuminance. The double-concave structure can better diverge the light rays, which is beneficial to the correction of the aberration between the marginal rays and the central rays to achieve high resolution. Under the condition of the same field of view angle, the light rays exiting from the image side of the first lens can enable the subsequent optical system to have a larger light receiving surface, realizing a larger light input amount and increasing the image plane brightness. The object side of the second lens is concave and cooperates with the concave surface of the image side of the first lens, enabling the light rays exiting from the second lens to be incident gently on the object side of the third lens, facilitating the gentle transition of the light rays, capable of reducing the light energy loss, being beneficial to the illuminance of the peripheral field of view, and at the same time changing the trend of the marginal rays, realizing the reduction of the front port diameter of the lens, reducing the volume, and being beneficial to miniaturization and cost reduction.

[0058] In an exemplary embodiment, the second lens may have a negative optical power. The second lens may have a concave-convex surface type. The object side of the second lens is concave and diverges the light rays, which is beneficial to receiving the diverging light rays from the image side of the first lens, enabling the light rays to exit gently, and being beneficial to improving off-axis aberrations such as field curvature. The image side of the second lens is convex, which can reduce the incident height of the large-angle light rays, thereby reducing the rear port diameter of the lens, and being beneficial to the miniaturization of the lens.

[0059] In an exemplary embodiment, the third lens may have a positive optical power. The third lens may have a concave-convex surface type. The third lens has a positive optical power, converging the incident light rays, which is beneficial to more light rays entering the optical system, improving the light flux, converging the diverging light rays in the front, and improving the imaging quality; the object side of the third lens being concave is beneficial to better receiving the light rays diverged by the second lens, leaving enough space for the aberration adjustment of the rear light rays, and the design of the convex image side increases the light ray deflection angle, further converging the light rays and realizing miniaturization at the rear end.

[0060] In an exemplary embodiment, the third lens may have a positive optical power. The third lens may have a convex-convex surface type. The third lens is a positive focal length lens, and the object side is convex, having a converging effect on the light rays, which can further reduce the aberration and improve the imaging quality; the image side of the third lens is convex, and the light rays of the marginal field of view have a downward trend after passing through the image side of the third lens, avoiding excessive deflection of the light rays and improving the system sensitivity.

[0061] In an exemplary embodiment, the third lens may have a positive optical power. The third lens may have a convex-concave surface type. The shape of the image side of the third lens is concave, and the light rays further transition to the fourth lens, which is beneficial to the light rays becoming more stable in the subsequent lenses.

[0062] In an exemplary embodiment, the fourth lens may have a positive optical power. The fourth lens may have a convex-concave surface shape. The fourth lens is a positive focal length lens, with the object side being convex, which converges light rays, reduces the rear aperture, and by reasonably setting the optical power of the fourth lens, the aberration can be further reduced and the imaging quality can be improved; the shape of the fourth lens is convex-concave, and the convex object side is beneficial for collecting the light rays entering the fourth lens, and the concave image side appropriately diverges the marginal light rays, improving the light transmission of the optical system.

[0063] In an exemplary embodiment, the fourth lens may have a positive optical power. The fourth lens may have a convex-convex surface shape. The image side of the fourth lens is convex, and the marginal field light rays are further converged after passing through the image side surface of the fourth lens, which is beneficial for reducing the rear aperture of the system, reducing energy loss at the same time, and improving the imaging quality.

[0064] In an exemplary embodiment, the fourth lens may have a negative optical power. The fourth lens may have a convex-concave surface shape. The fourth lens has a negative optical power, and the object side is convex, which can compress the angle of the incident light rays to achieve a smooth transition of the light rays, enabling the diverging light rays to smoothly enter the rear, and further making the light ray trend transition smoothly, which is beneficial for reducing the aperture of the rear lens. The object side of the fourth lens is convex, and the image side is concave. When the light rays reach the image side, they are almost perpendicular to the incidence, with a small deflection of the light rays and small light energy loss, and it is also beneficial for reducing the sensitivity of the lens. When the fourth lens is negative, it is in a shape close to a concentric circle, playing a role in the transition of light rays.

[0065] In an exemplary embodiment, the fifth lens may have a positive optical power. The fifth lens may have a convex-convex surface shape. The fifth lens is a positive lens, which converges light rays. 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.

[0066] In an exemplary embodiment, the fifth lens may have a negative optical power. The fifth lens may have a convex-concave surface shape. The fifth lens is a negative focal length lens, which diverges light rays, enabling the subsequent optical system to have a larger light receiving surface. Reasonably distributing the optical power is beneficial for reducing aberration and improving the optical performance.

[0067] 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 diverging effect on light. Reasonably setting the optical power of the sixth lens can further reduce aberration and improve imaging quality. The convex surface on the image side converges light and adjusts the height of marginal rays on the image plane, which is beneficial to improving CRA. The fifth and sixth lenses may be a cemented lens, which can smoothly transition the light passing through the fourth lens to the imaging plane and reduce the overall length. Various aberrations of the optical system can be fully corrected. On the premise of a compact structure, the resolution can be improved, and optical performance such as distortion and CRA can be optimized. Using a cemented lens can also reduce the tolerance sensitivity of independent lens units due to tilt / eccentricity generated during the assembly process. Further, the assembly method of the entire group of lenses reduces the number of multiple assembly processes.

[0068] In an exemplary embodiment, the sixth lens may have a negative optical power. The sixth lens may have a concave-concave surface type. The sixth lens has a negative optical power, which adjusts the trend of the light emitted by the fifth lens, making the light diverge more reasonably to the rear lenses and reducing the field curvature between different fields of view. The object side surface of the sixth lens is concave, which can receive and diverge the front light. The light in the marginal field of view will have a greater optical path after passing through the sixth lens than the light in the central field of view, changing the trend of the light in the marginal field of view, which is beneficial to defocus correction of the marginal field of view aberration and achieving high resolution. The image side surface of the sixth lens is concave, which is beneficial to raising the height of the emitted light, reducing the overlap degree of the light in different fields of view on the rear aspherical lens, and enabling the rear lens to better correct the aberration between different fields of view.

[0069] 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. The double-convex structure can further deflect the light toward the optical axis direction and reduce the rear aperture diameter. The fifth and sixth lenses may be a cemented lens, which can smoothly transition the light passing through the fourth lens to the imaging plane and reduce the overall length. Various aberrations of the optical system can be fully corrected. On the premise of a compact structure, the resolution can be improved, and optical performance such as distortion and CRA can be optimized.

[0070] In an exemplary embodiment, the seventh lens may have a negative optical power. The seventh lens may have a convex-concave surface type. The negative optical power of the seventh lens is beneficial to light divergence, making the angle of the light reaching the image plane meet the CRA requirements, improving resolution and illuminance, enlarging the image plane, and achieving high resolution at large angles at the edge. The object side surface of the seventh lens is convex, which can converge light, deflect the light toward the center, and improve the imaging quality of the central field of view. The image side surface of the seventh lens is concave, which can further correct the system aberration, improve the image quality, and optimize optical performance such as distortion and CRA.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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 may all be glass lenses. An optical lens made of glass can suppress the shift of the back focus of the optical lens with temperature changes, so as to improve the system stability. At the same time, using glass material can avoid problems such as blurred imaging of the lens and affecting the normal use of the lens caused by high and low temperature changes in the use environment. Specifically, when focusing on temperature performance and resolution quality, the first lens to the seventh lens may all be glass aspherical lenses. In application scenarios with lower requirements for temperature stability, the first lens to the seventh lens in the optical lens may also all be made of plastic. Making an optical lens with plastic can effectively reduce the manufacturing cost. Of course, the first lens to the seventh lens in the optical lens may also be made of a combination of plastic and glass.

[0081] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.03 ≤ (d5 + d6) / TTL ≤ 0.2, where d5 is the central thickness of the fifth lens on the optical axis, d6 is the central thickness of the sixth 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. The fifth and sixth lenses may be glued together to form a doublet lens. By controlling this conditional formula, appropriately increasing the central thickness of the glued lens within a certain range is beneficial to enhancing the light control ability 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 formula within this range, it is more beneficial to enhancing the light control ability of the glued 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 ability of the glued lens and improving the imaging quality.

[0082] In an exemplary embodiment, the optical lens according to the present application may satisfy: 2 ≤ |F7 / F|, where 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 relatively large focal length and causes less deflection of light rays, which is beneficial for the seventh lens to be close to the image plane, enabling a smaller back focal length, achieving a large image plane, facilitating increasing the distance from the sixth lens, improving the sensitivity of the system, and enhancing the imaging quality. It should be noted that the maximum value of |F7 / F| in the present application reaches 34.7521. The seventh lens has little influence on the light ray trend and is used to receive the light rays emitted from the cemented lens, playing a transitional role, enabling the seventh lens to be close to the image plane, achieving a smaller back focal length, achieving a large image plane, facilitating increasing the distance from the sixth lens, improving the sensitivity of the system, and enhancing the imaging quality. When |F7 / F| approaches infinity, the same effect can also be achieved. In some exemplary embodiments, the absolute value of the effective focal length of the seventh lens may tend to be very large or approach infinity, such as 300, 500, or 1000, etc. Therefore, the value range of the conditional expression |F7 / F| may also tend to be very large or approach 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 ray trend, enabling the seventh lens to be close to the image plane, better achieving a smaller back focal length, achieving a larger image plane, further facilitating increasing the distance from the sixth lens, further improving the sensitivity of the system, and being more conducive to enhancing the imaging quality. Further still, F7 and F may also satisfy: 2.6553 ≤ |F7 / F| ≤ 34.7521, which is more conducive to enhancing the imaging quality.

[0083] In an exemplary embodiment, the optical lens according to the present application may satisfy: -5 ≤ R4 / R5 ≤ 0.8, where R4 is the curvature radius of the second side of the second lens and R5 is the curvature radius of the first side of the third lens. By controlling this conditional expression, the light rays passing through the first and second lenses can be continuously diverged, which is beneficial for increasing the incident height of the marginal light rays, reducing distortion, and enhancing resolution. More specifically, R4 and R5 may further satisfy: -4 ≤ R4 / R5 ≤ 0.6. By controlling the conditional expression within this range, it can be further beneficial for increasing the incident height of the marginal light rays, more conducive to reducing distortion, and enhancing resolution. Further still, R4 and R5 may also satisfy: -2.7008 ≤ R4 / R5 ≤ 0.3174, which is more conducive to enhancing the imaging quality.

[0084] In an exemplary embodiment, the optical lens according to the present application can satisfy: -25 ≤ F2 / F ≤ -2, where 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 relatively large, which is beneficial for receiving the rapidly diverging light in the front, enabling the light to further diverge effectively into the rear optical system. At the same time, it will not be overly divergent to affect the rear aperture, and it is beneficial for reducing the system sensitivity and improving the imaging quality. More specifically, F2 and F can further satisfy: -20 ≤ F2 / F ≤ -2.5. By controlling the conditional expression within this range, it is more beneficial for receiving the rapidly diverging light in the front, enabling the light to diverge more effectively into the rear optical system and not being overly divergent to affect the rear aperture. At the same time, it is more beneficial for reducing the system sensitivity and further improving the imaging quality. Furthermore, F2 and F can also satisfy: -14.9343 ≤ F2 / F ≤ -3.0069, which is more beneficial for improving the imaging quality.

[0085] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.06 ≤ d45 / TTL ≤ 0.2, where d45 is the air gap between the fourth lens and the fifth 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. In the optical lens according to the present application, the light starts to converge after passing through the third lens and shows an overall converging trend when exiting the fourth lens. By controlling this conditional expression and with a relatively large distance between the fourth and fifth lenses, it is beneficial for the light to be effectively converged, reducing the rear aperture. At the same time, the light can transition smoothly to the fifth lens, reducing the aberration caused by the continuous convergence of the third and fourth lenses, which is beneficial for improving the imaging quality. At the same time, reasonably setting the distance between the fourth and fifth lenses leaves room for the adjustment of the back focal length, which can solve the assembly problem on the basis of meeting miniaturization requirements and achieve high resolution. More specifically, d45 and TTL can further satisfy: 0.07 ≤ d45 / TTL ≤ 0.18. By controlling the conditional expression within this range, it is further beneficial for the light to be effectively converged, reducing the rear aperture. At the same time, the light can transition more smoothly to the fifth lens, reducing the aberration caused by the continuous convergence of the third and fourth lenses, which is further beneficial for improving the imaging quality. At the same time, it is more beneficial for leaving room for the adjustment of the back focal length, facilitating the solution of the assembly problem on the basis of meeting miniaturization requirements and further achieving high resolution. Furthermore, d45 and TTL can also satisfy: 0.0806 ≤ d45 / TTL ≤ 0.1501, which is more beneficial for improving the imaging quality.

[0086] In an exemplary embodiment, the optical lens according to the present application may satisfy: TTL / F ≤ 4.5, where 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, and F is the total effective focal length of the optical lens. By controlling this conditional expression, the lens length can be effectively restricted, which is beneficial to the miniaturization of the lens while taking into account the long focal length. More specifically, TTL and F may further satisfy: 3.5 ≤ TTL / F ≤ 4.3. By controlling the conditional expression within this range, the lens length can be further effectively restricted, which is more beneficial to the miniaturization of the lens while taking into account the long focal length. Furthermore, TTL and F may also satisfy: 3.8753 ≤ TTL / F ≤ 4.1300, which is more beneficial to improving the imaging quality on the basis of miniaturization.

[0087] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1.5 ≤ F3 / F ≤ 8, where 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 continuously diverging light rays in front. The focal length is relatively large, and the light ray deflection angle is small, which is beneficial to reducing the light sensitivity. At the same time, the light passing amount is controlled to improve the imaging quality. This conditional expression is further combined with the conditional expression -25 ≤ F2 / F ≤ -2. The focal lengths of the second and third lenses are both relatively large, and the light rays can smoothly transition to the rear lens, reducing the sensitivity of the optical system, which is more beneficial to improving the imaging quality. More specifically, F3 and F may further satisfy: 1.7 ≤ F3 / F ≤ 6.5. By controlling the conditional expression within this range, it can be further beneficial to reducing the light sensitivity, and at the same time better control the light passing amount, further improving the imaging quality. This conditional expression is combined with the conditional expression -25 ≤ F2 / F ≤ -2. The focal lengths of the second and third lenses are both relatively large, and the light rays can transition to the rear lens more smoothly, further reducing the sensitivity of the optical system, which is more beneficial to improving the imaging quality. Furthermore, F3 and F may also satisfy: 1.8948 ≤ F3 / F ≤ 4.9664, which is more beneficial to improving the imaging quality.

[0088] In an exemplary embodiment, the optical lens according to the present application may satisfy: BFL / TTL ≤ 0.15, where 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 satisfied. The optical back focal length BFL of the system is relatively small, and the overall length of the lens is compressed, so that the miniaturization of the lens can be achieved. More specifically, BFL and TTL may further satisfy: 0.08 ≤ BFL / TTL ≤ 0.13. By controlling the conditional expression within this range, the miniaturization of the lens can be further achieved. Furthermore, BFL and TTL may also satisfy: 0.0920 ≤ BFL / TTL ≤ 0.1209, which is more beneficial to improving the imaging quality on the basis of miniaturization.

[0089] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.05 ≤ d67 / TTL ≤ 0.2, where d67 is the air gap between the sixth lens and the seventh 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. In the optical lens according to the present application, the light rays show a continuous converging trend as a whole before reaching the sixth lens. By controlling this conditional expression, a relatively large gap is set between the sixth lens and the seventh lens, increasing the optical path of the reflected light between the lenses, which is beneficial to making the ghost image focus point away from the image plane and weakening the ghost image; at the same time, it is beneficial to the smooth transition of the converging light rays in front, realizing beam splitting. With the relatively large focal length of the seventh lens, the field curvature is further reduced and the resolution is improved. More specifically, d67 and TTL may further satisfy: 0.06 ≤ d67 / TTL ≤ 0.15. By controlling the conditional expression within this range, it is further beneficial to make the ghost image focus point away from the image plane and further weaken the ghost image; at the same time, it is more beneficial to the smooth transition of the converging light rays in front, realizing beam splitting. With the relatively large focal length of the seventh lens, it is beneficial to further reduce the field curvature and further improve the resolution. Furthermore, d67 and TTL may also satisfy: 0.0710 ≤ d67 / TTL ≤ 0.1247, which is more beneficial to improving the imaging quality.

[0090] In an exemplary embodiment, the optical lens according to the present application may satisfy: |(H - F×θ) / (F×θ)| ≤ 0.1, where H is the image height corresponding to the maximum field of view 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 of view angle of the optical lens. By controlling this conditional expression, it is ensured that when the field of view angle and the size of the imaging surface of the lens remain unchanged, the focal length of the lens is increased, highlighting the imaging effect in the central area of the imaging surface of the lens. More specifically, H, F, and θ may further satisfy: 0.002 ≤ |(H - F×θ) / (F×θ)| ≤ 0.08. By controlling the conditional expression within this range, it is more beneficial to ensure that when the field of view angle and the size of the imaging surface of the lens remain unchanged, the focal length of the lens is increased, highlighting the imaging effect in the central area of the imaging surface of the lens. Furthermore, H, F, and θ may also satisfy: 0.0039 ≤ |(H - F×θ) / (F×θ)| ≤ 0.0558, which is more beneficial to improving the imaging quality.

[0091] In an exemplary embodiment, the optical lens according to the present application can satisfy: -0.5 ≤ R3 / R4 ≤ 2, where R3 is the radius of curvature of the first side surface of the second lens, and R4 is the radius of curvature of the second side surface 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 the light path, reduces the sensitivity of the system, and improves the performance. More specifically, R3 and R4 can further satisfy: -0.3 ≤ R3 / R4 ≤ 1.2. By controlling the conditional expression within this range, it can be more conducive to the smooth transition of the light path, further reduce the sensitivity of the system, and be more beneficial to improving the performance. More specifically, R3 and R4 can also satisfy: -0.0605 ≤ R3 / R4 ≤ 0.8217, which is more beneficial to improving the imaging quality.

[0092] In an exemplary embodiment, the optical lens according to the present application can satisfy: 50 ≤ (FOV × F) / H ≤ 75, where 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, long focal length and large field of view imaging can be achieved while satisfying a certain image height. More specifically, FOV, F, and H can further satisfy: 55 ≤ (FOV × F) / H ≤ 65. By controlling the conditional expression within this range, it can be more conducive to achieving long focal length and large field of view imaging while satisfying a certain image height, and improving the imaging quality. More specifically, FOV, F, and H can further satisfy: 57.0731 ≤ (FOV × F) / H ≤ 60.6826, which is more beneficial to improving the imaging quality.

[0093] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.1 ≤ D / H / F ≤ 0.25, where 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, H is the image height corresponding to the maximum field of view angle of the optical lens, and F is the total effective focal length of the optical lens. By controlling this conditional expression, the relationship between the aperture, image height, and focal length can be reasonably set to provide the lens 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 beneficial to improving the imaging quality.

[0094] In an exemplary embodiment, the optical lens according to the present application may satisfy: -2.8 ≤ F1 / F ≤ -1, where 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 beneficial to collecting light rays with a large field of view angle into 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 is further beneficial to collecting light rays with a large field of view angle into the optical system. More specifically, F1 and F may also satisfy: -1.9572 ≤ F1 / F ≤ -1.3275, which is more beneficial to improving the imaging quality.

[0095] In an exemplary embodiment, the optical lens according to the present application may satisfy: -1 ≤ F / F4 ≤ 1.5, where 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 power of the fourth lens is reasonably controlled, which is beneficial to continuously converging the light rays emitted from the third lens, reducing the rear port diameter, and achieving a 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 continuously converging the light rays emitted from the third lens, further reducing the rear port diameter, and is more beneficial to achieving a short TTL. More specifically, F and F4 may also satisfy: -0.1922 ≤ F / F4 ≤ 0.7230, which is more beneficial to improving the imaging quality while taking into account miniaturization.

[0096] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.005 ≤ d2 / TTL ≤ 0.12, where d2 is the central thickness of the second 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 central thickness of the second lens is reasonably controlled. Combining with its relatively large focal length, it is beneficial to shorten the optical path, allowing more marginal light rays to enter the rear optical system and increasing the light transmission amount 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 be further beneficial to shorten the optical path, further allowing more marginal light rays to enter the rear optical system, and is more beneficial to increasing the light transmission amount of the optical system. More specifically, d2 and TTL may further satisfy: 0.0250 ≤ d2 / TTL ≤ 0.0759, which is more beneficial to improving the imaging quality.

[0097] In an exemplary embodiment, the optical lens according to the present application can satisfy: (d23 + d34) / TTL ≤ 0.1, where 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 of the first lens to the imaging surface of the optical lens on the optical axis. By controlling this conditional expression, the air gaps between the second lens and the third lens, and between the third lens and the fourth lens are reduced, making the front-end structure of the optical lens compact and leaving enough space for the arrangement of the rear lenses, which is beneficial to achieving high resolution while meeting the miniaturization requirement. More specifically, d23, d34, and TTL can 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 made even more compact, leaving enough space for the arrangement of the rear lenses, and further facilitating the achievement of high resolution while meeting the miniaturization requirement. More specifically, d23, d34, and TTL can also satisfy: 0.0065 ≤ (d23 + d34) / TTL ≤ 0.0428, which is more beneficial to improving the imaging quality while taking into account miniaturization.

[0098] In an exemplary embodiment, the optical lens according to the present application can satisfy: d23 / TTL ≤ 0.08, where d23 is the air gap between the second lens and the third 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 distance between the second lens and the third lens is small, which is beneficial to miniaturization; combined with the optical powers of the second lens and the third lens being one negative and one positive, it is beneficial to correcting aberrations and improving resolution. More specifically, d23 and TTL can further satisfy: d23 / TTL ≤ 0.06. By controlling the conditional expression within this range, it can be further beneficial to miniaturization; combined with the optical powers of the second lens and the third lens being one negative and one positive, it can be more beneficial to correcting aberrations and further improving resolution. More specifically, d23 and TTL can also satisfy: 0.0032 ≤ d23 / TTL ≤ 0.0397, which is more beneficial to improving the imaging quality while taking into account miniaturization.

[0099] In an exemplary embodiment, the optical lens according to the present application may satisfy: d34 / TTL ≤ 0.01, where 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 of the first lens to the imaging surface of the optical lens on the optical axis. By controlling this conditional expression, reducing the gap between the third lens and the fourth lens is beneficial for the continuous convergence of light, reducing light energy loss. While reducing TTL, it makes the light transition smoothly and reduces sensitivity. More specifically, d34 and TTL may further satisfy: d34 / TTL ≤ 0.005. By controlling the conditional expression within this range, it is more beneficial for the continuous convergence of light, more beneficial for reducing light energy loss. While reducing TTL, it makes the light transition more smoothly and further reduces sensitivity. More specifically, d34 and TTL may also satisfy: 0.0031 ≤ d34 / TTL ≤ 0.0032, which is more beneficial for improving the imaging quality.

[0100] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.7 ≤ F / H ≤ 0.95, where 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, setting an appropriate relationship between the focal length and the image height is beneficial for improving the imaging clarity of the system and achieving a large image plane. More specifically, F and H may further satisfy: 0.75 ≤ F / H ≤ 0.9. By controlling the conditional expression within this range, it is more beneficial for improving the imaging clarity of the system and achieving a large image plane. More specifically, F and H may also satisfy: 0.8142 ≤ F / H ≤ 0.8657, which is more beneficial for improving the imaging quality.

[0101] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.5 ≤ R7 / F ≤ 2.5, where 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 has a relatively small radius of curvature, effectively converging the light entering the rear optical system, which is beneficial for reducing the rear port diameter, increasing the light transmission amount, and improving 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, further beneficial for reducing the rear port diameter, increasing the light transmission amount, and improving the imaging quality. More specifically, R7 and F may further satisfy: 0.9915 ≤ R7 / F ≤ 1.6721, which is more beneficial for improving the imaging quality.

[0102] In an exemplary embodiment, the optical lens according to the present application can satisfy: -3 ≤ R11 / F ≤ 1.5, where R11 is the radius of curvature of the second side surface of the fifth lens, and F is the total effective focal length of the optical lens. By controlling this conditional expression, reasonably controlling the ratio of the radius of curvature of the image side surface of the fifth lens to the focal length of the lens within a certain range can assist in making the light path gentle, especially for the light in the edge field of view, and can better correct aberration and improve the imaging quality to achieve high resolution. More specifically, R11 and F can further satisfy: -2 ≤ R11 / F ≤ 1. By controlling the conditional expression within this range, it is more conducive to making the light path gentle, especially for the light in the edge field of view, and can better correct aberration and further improve the imaging quality to achieve high resolution. More specifically, R11 and F can also satisfy: -1.5128 ≤ R11 / F ≤ 0.6900, which is more conducive to improving the imaging quality.

[0103] In an exemplary embodiment, the optical lens according to the present application can satisfy: -8 ≤ F5 / F6 ≤ -0.1, where 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 cemented together to form a cemented component. By controlling this conditional expression, reasonably controlling the focal lengths of the two lenses in the cemented component is beneficial to correcting chromatic aberration and improving the image quality. More specifically, F5 and F6 can 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 the image quality. More specifically, F5 and F6 can also satisfy: -3.7543 ≤ F5 / F6 ≤ -0.2725, which is more conducive to improving the imaging quality.

[0104] In an exemplary embodiment, the optical lens according to the present application can satisfy: (R1 / D) / (R2 / D2) ≤ 9, where R1 is the radius of curvature of the first side surface of the first 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, R2 is the radius of curvature of the second side surface of the first lens, and D2 is the maximum effective aperture of the second side surface of the first lens corresponding to the maximum field of view angle of the optical lens. By controlling this conditional expression, reasonably controlling the radius of curvature and aperture of the two surfaces of the first lens. When the first lens has a negative optical power, the difference between the radius of curvature values of the two surfaces is small and the aperture values of the two surfaces are closer, which can reduce the divergence of light, is beneficial to suppressing light, and makes the front aperture of the lens smaller. More specifically, R1, D, R2, and D2 can further satisfy: 1.25 ≤ (R1 / D) / (R2 / D2) ≤ 7.75. By controlling the conditional expression within this range, it can be further beneficial to reducing the divergence of light, more beneficial to suppressing light, and further making the front aperture of the lens smaller. More specifically, R1, D, R2, and D2 can also satisfy: 2.5211 ≤ (R1 / D) / (R2 / D2) ≤ 6.4461, which is more conducive to improving the imaging quality while taking into account the small front aperture.

[0105] In an exemplary embodiment, the optical lens according to the present application can 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 beneficial to increasing the light transmission amount. A large entrance pupil diameter helps to improve the relative illumination. More specifically, F and ENPD can further satisfy: 1.7 ≤ F / ENPD ≤ 1.9. By controlling the conditional expression within this range, it is more beneficial to increase the light transmission amount and further helps to improve the relative illumination. More specifically, F and ENPD can also satisfy: 1.8000 ≤ F / ENPD ≤ 1.8200, which is more beneficial to improving the imaging quality.

[0106] In an exemplary embodiment, the optical lens according to the present application can satisfy: 1.8 ≤ R1 / F ≤ 8.5, where R1 is the radius of curvature of the first side surface 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 surface 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 finally, 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 beneficial to 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 finally, further effectively reducing the relative energy value of the ghost image and being more beneficial 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 beneficial to improving the imaging quality.

[0107] In an exemplary embodiment, the optical lens according to the present application can satisfy: -10 ≤ R6 / R7 ≤ 25, where R6 is the radius of curvature of the second side surface of the third lens and R7 is the radius of curvature of the first side surface of the fourth lens. By controlling this conditional expression, reasonably setting the radius of curvature of the image side surface of the third lens and the object side surface of the fourth lens is beneficial to more light rays entering the fourth lens, increasing the light transmission ability of the system; further, the image side surface of the third lens and the object side surface of the fourth lens are opposite, and the light rays can be effectively converged, reducing the light energy loss, further reducing the rear port diameter, and achieving high resolution. More specifically, R6 and R7 can further satisfy: -7 ≤ R6 / R7 ≤ -0.5. By controlling the conditional expression within this range, it can be further beneficial to more light rays entering the fourth lens, increasing the light transmission ability of the system; and the light rays can be more effectively converged, further reducing the light energy loss, further reducing the rear port diameter, and being more beneficial to achieving high resolution. More specifically, R6 and R7 can also satisfy: -5.5184 ≤ R6 / R7 ≤ 17.6805, which is more beneficial to improving the imaging quality.

[0108] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.5 ≤ F56 / F ≤ 30, where 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 glued together to form a glued component. By controlling this conditional expression, the combined focal length of the glued component can be reasonably controlled, effectively controlling the light path entering the glued component, reducing the aberration caused by the large-angle light entering from the front end, and improving the resolution performance. More specifically, F56 and F may further satisfy: 0.7 ≤ F56 / F ≤ 24. By controlling the conditional expression within this range, the light path entering the glued component can be more effectively controlled, further reducing the aberration caused by the large-angle light entering from the front end, and further facilitating the improvement of the resolution performance. More specifically, F56 and F may also satisfy: 0.9904 ≤ F56 / F ≤ 19.2509, which is more conducive to improving the imaging quality.

[0109] 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.

[0110] The optical lens according to an exemplary embodiment of the present application adopts a seven-lens structure. By reasonably setting parameters such as the lens optical power, surface shape, curvature radius, central thickness, and air gap between lenses, it is beneficial for the optical lens to have one or more beneficial effects such as high resolution, low sensitivity, weak ghost images, miniaturization, and high light flux, enabling the optical lens to better meet the high requirements of, for example, in-vehicle applications.

[0111] However, those skilled in the art should understand 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 the seven-lens example is described 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 specific embodiments of the optical lens applicable to the above embodiments will be further described with reference to the accompanying drawings. Embodiment 1

[0112] The following refers to Figure 1 Describe the optical lens according to Embodiment 1 of the present application. Figure 1 The structural schematic diagram of the optical lens according to Embodiment 1 of the present application is shown.

[0113] As Figure 1 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a stop STO, a fifth lens L5, a sixth lens L6, and a seventh lens L7 along the optical axis from the first side to the second side, and further 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.

[0114] The first lens L1 is a convex-concave lens with a negative optical power, its first side S1 is a convex surface, and its second side S2 is a concave surface. The second lens L2 is a concave-convex lens with a negative optical power, its first side S3 is a concave surface, and its second side S4 is a convex surface. The third lens L3 is a convex-convex lens with a positive optical power, its first side S5 is a convex surface, and its second side S6 is a convex surface. The fourth lens L4 is a convex-concave lens with a positive optical power, its first side S7 is a convex surface, and its second side S8 is a concave surface. The fifth lens L5 is a convex-concave lens with a negative optical power, its first side S10 is a convex surface, and its second side S11 is a concave surface. The sixth lens L6 is a convex-convex lens with a positive optical power, its first side S11 is a convex surface, and its second side S12 is a convex surface. The seventh lens L7 is a concave-concave lens with a negative optical power, its first side S13 is a concave surface, and its second side S14 is a concave surface.

[0115] 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 aspherical lens. The stop STO is located between the fourth lens L4 and the fifth lens L5. The second surface S14 of the seventh lens L7 has an inflection point.

[0116] In this embodiment, the filter IR has, for example, a first surface S15 and a second surface S16; the protective glass CG has, for example, a first surface S17 and a second surface S18.

[0117] When the optical lens is used for imaging, light from an object can sequentially pass through the surfaces S1 to S18 and finally form an image on the imaging surface; when the optical lens is used for projection, light from the light source side can sequentially pass through the surfaces S18 to S1 and finally be projected onto a target object (not shown).

[0118] 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 Embodiment 1. Among them, regarding "thickness / distance", it should be understood that the thickness / distance in the row where S1 is located is the central thickness of the first lens L1, the thickness / distance in the row where S2 is located is the air spacing between the first lens L1 and the second lens L2, the thickness / distance in the row where S3 is located is the central thickness of the second lens L2, the thickness / distance in the row where S4 is located is the air spacing between the second lens L2 and the third lens L3, and so on.

[0119] Table 1

[0120]

[0121] In this embodiment, the first surface S13 and the second surface S14 of the seventh lens L7 are aspherical, and the surface profile of the aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0122] (1)

[0123] Where x is the sagitta, the distance from the vertex of the aspherical surface at a position with a height of h along the optical axis direction; c is the paraxial curvature of the aspherical surface, c = 1 / R (that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic constant; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the conic constant k and the higher-order term coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for the aspherical surfaces S13 - S14 in Embodiment 1.

[0124] Table 2

[0125] Embodiment 2

[0126] Figure 2 The structural schematic 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 simplicity, some descriptions similar to those in Embodiment 1 will be omitted.

[0127] The difference from Embodiment 1 is that in this embodiment, the third lens L3 is a concave-convex lens with a positive optical power, its first side S5 is concave, and its second side S6 is convex. The fifth lens L5 is a convex-convex lens with a positive optical power, its first side S10 is convex, and its second side S11 is convex. The sixth lens L6 is a concave-concave lens with a negative optical power, its first side S11 is concave, and its second side S12 is concave. The seventh lens L7 is a convex-concave lens with a negative optical power, its first side S13 is convex, and its second side S14 is concave. In this embodiment, both the first side S13 and the second side S14 of the seventh lens L7 have an inflection point.

[0128] Table 3 shows the basic parameters of the optical lens of Embodiment 2. Table 4 shows the conic coefficients and higher-order term coefficients of the aspherical mirror surfaces S13 - S14 that can be used in this embodiment, where the aspherical surface profiles can be defined by the formula (1) given in the above Embodiment 1.

[0129] Table 3

[0130]

[0131] Table 4

[0132] Embodiment 3

[0133] Figure 3 The structural schematic diagram of the optical lens according to Embodiment 3 of the present application is shown.

[0134] The difference from Embodiment 1 is that in this embodiment, the second lens L2 is a concave-concave lens with a negative optical power, its first side S3 is concave, and its second side S4 is concave. The third lens L3 is a concave-convex lens with a positive optical power, its first side S5 is concave, and its second side S6 is convex. The fifth lens L5 is a convex-convex lens with a positive optical power, its first side S10 is convex, and its second side S11 is convex. The sixth lens L6 is a concave-concave lens with a negative optical power, its first side S11 is concave, and its second side S12 is concave. The seventh lens L7 is a convex-concave lens with a positive optical power, its first side S13 is convex, and its second side S14 is concave.

[0135] Table 5 shows the basic parameters of the optical lens of Embodiment 3. Tables 6 and 7 show the conic coefficients and higher-order term coefficients of the aspherical mirror surfaces S13 - S14 that can be used in this embodiment.

[0136] Table 5

[0137]

[0138] Table 6

[0139]

[0140] Table 7

[0141] Example 4

[0142] Figure 4 The structural schematic diagram of the optical lens according to Example 4 of the present application is shown.

[0143] The difference from Example 1 is that in this example, the fourth lens L4 is a convex plano-lens with a positive optical power, its first side S7 is a convex surface, and its second side S8 is a flat surface. The fifth lens L5 is a convex-convex lens with a positive optical power, its first side S10 is a convex surface, and its second side S11 is a convex surface. The sixth lens L6 is a concave-convex lens with a negative optical power, its first side S11 is a concave surface, and its second side S12 is a convex surface.

[0144] Table 8 shows the basic parameters of the optical lens of Example 4. Table 9 shows the conic coefficients and higher-order term coefficients of the aspherical surfaces S13 - S14 that can be used in this example.

[0145] Table 8

[0146]

[0147] Table 9

[0148] Example 5

[0149] Figure 5 The structural schematic diagram of the optical lens according to Example 5 of the present application is shown.

[0150] The difference from Embodiment 1 is that in this embodiment, the third lens L3 is a convex-concave lens with a positive optical power, its first side S5 is a convex surface, and its second side S6 is a concave surface. The fourth lens L4 is a convex-convex lens with a positive optical power, its first side S7 is a convex surface, and its second side S8 is a convex surface. The fifth lens L5 is a convex-convex lens with a positive optical power, its first side S10 is a convex surface, and its second side S11 is a convex surface. The sixth lens L6 is a concave-convex lens with a negative optical power, its first side S11 is a concave surface, and its second side S12 is a convex surface. The seventh lens L7 is a convex-concave lens with a negative optical power, its first side S13 is a convex surface, and its second side S14 is a concave surface. In this embodiment, both the first side S13 and the second side S14 of the seventh lens L7 have an inflection point.

[0151] Table 10 shows the basic parameters of the optical lens of Embodiment 5. Table 11 shows the conic coefficients and higher-order term coefficients of the aspherical surfaces S13 - S14 that can be used in this embodiment.

[0152] Table 10

[0153]

[0154] Table 11

[0155] Embodiment 6

[0156] Figure 6 Shows a schematic structural diagram of an optical lens according to Embodiment 6 of the present application.

[0157] The difference from Embodiment 1 is that in this embodiment, the fourth lens L4 is a convex-concave lens with a negative optical power, its first side S7 is a convex surface, and its second side S8 is a concave surface. The fifth lens L5 is a convex-convex lens with a positive optical power, its first side S10 is a convex surface, and its second side S11 is a convex surface. The sixth lens L6 is a concave-convex lens with a negative optical power, its first side S11 is a concave surface, and its second side S12 is a convex surface.

[0158] Table 12 shows the basic parameters of the optical lens of Embodiment 6. Table 13 shows the conic coefficients and higher-order term coefficients of the aspherical surfaces S13 - S14 that can be used in this embodiment.

[0159] Table 12

[0160]

[0161] Table 13

[0162] Embodiment 7

[0163] Figure 7 Shows a schematic structural diagram of an optical lens according to Embodiment 7 of the present application.

[0164] The difference from Embodiment 1 is that in this embodiment, the fourth lens L4 is a convex-convex lens with a positive optical power, its first side S7 is a convex surface, and its second side S8 is a convex surface. The fifth lens L5 is a convex-convex lens with a positive optical power, its first side S10 is a convex surface, and its second side S11 is a convex surface. The sixth lens L6 is a concave-convex lens with a negative optical power, its first side S11 is a concave surface, and its second side S12 is a convex surface.

[0165] Table 14 shows the basic parameters of the optical lens of Embodiment 7. Table 15 shows the conic coefficients and high-order term coefficients of each aspherical mirror surface S13 - S14 that can be used in this embodiment.

[0166] Table 14

[0167]

[0168] Table 15

[0169] Embodiment 8

[0170] Figure 8 Shows a schematic structural diagram of an optical lens according to Embodiment 8 of the present application.

[0171] The difference from Embodiment 1 is that in this embodiment, the third lens L3 is a concave-convex lens with a positive optical power, its first side S5 is a concave surface, and its second side S6 is a convex surface. The fifth lens L5 is a convex-convex lens with a positive optical power, its first side S10 is a convex surface, and its second side S11 is a convex surface. The sixth lens L6 is a concave-convex lens with a negative optical power, its first side S11 is a concave surface, and its second side S12 is a convex surface. In this embodiment, both the first side S13 and the second side S14 of the seventh lens L7 have inflection points.

[0172] Table 16 shows the basic parameters of the optical lens of Embodiment 8. Table 17 shows the conic coefficients and high-order term coefficients of each aspherical mirror surface S13 - S14 that can be used in this embodiment.

[0173] Table 16

[0174]

[0175] Table 17

[0176] Embodiment 9

[0177] Figure 9Shows a schematic structural diagram of an optical lens according to Embodiment 9 of the present application.

[0178] The difference from Embodiment 1 is that in this embodiment, the third lens L3 is a concave-convex lens with positive optical power, its first side S5 is concave, and its second side S6 is convex. The fifth lens L5 is a convex-convex lens with positive optical power, its first side S10 is convex, and its second side S11 is convex. The sixth lens L6 is a concave-convex lens with negative optical power, its first side S11 is concave, and its second side S12 is convex. The seventh lens L7 is a concave-convex lens with negative optical power, its first side S13 is concave, and its second side S14 is convex.

[0179] Table 18 shows the basic parameters of the optical lens of Embodiment 9. Table 19 shows the conic coefficients and higher-order term coefficients of each aspherical mirror surface S13 - S14 that can be used in this embodiment.

[0180] Table 18

[0181]

[0182] Table 19

[0183] Embodiment 10

[0184] Figure 10 Shows a schematic structural diagram of an optical lens according to Embodiment 10 of the present application.

[0185] The difference from Embodiment 1 is that in this embodiment, the third lens L3 is a concave-convex lens with positive optical power, its first side S5 is concave, and its second side S6 is convex. The fifth lens L5 is a convex-convex lens with positive optical power, its first side S10 is convex, and its second side S11 is convex. The sixth lens L6 is a concave-concave lens with negative optical power, its first side S11 is concave, and its second side S12 is concave. The seventh lens L7 is a convex-concave lens with positive optical power, its first side S13 is convex, and its second side S14 is concave. In this embodiment, both the first side S13 and the second side S14 of the seventh lens L7 have an inflection point.

[0186] Table 20 shows the basic parameters of the optical lens of Embodiment 10. Table 21 shows the conic coefficients and higher-order term coefficients of each aspherical mirror surface S13 - S14 that can be used in this embodiment.

[0187] Table 20

[0188]

[0189] Table 21

[0190] Example 11

[0191] Figure 11 Fig. shows a schematic structural diagram of an optical lens according to Example 11 of the present application.

[0192] The difference from Example 1 is that in this example, the third lens L3 is a concave-convex lens with a positive optical power, its first side S5 is concave, and its second side S6 is convex. The fifth lens L5 is a convex-convex lens with a positive optical power, its first side S10 is convex, and its second side S11 is convex. The sixth lens L6 is a concave-convex lens with a negative optical power, its first side S11 is concave, and its second side S12 is convex. The seventh lens L7 is a convex-concave lens with a negative optical power, its first side S13 is convex, and its second side S14 is concave. In this example, both the first side S13 and the second side S14 of the seventh lens L7 have an inflection point.

[0193] Table 22 shows the basic parameters of the optical lens of Example 11. Table 23 shows the conic coefficients and higher-order term coefficients of the aspherical mirror surfaces S13 - S14 that can be used in this example.

[0194] Table 22

[0195]

[0196] Table 23

[0197] Example 12

[0198] Figure 12 Fig. shows a schematic structural diagram of an optical lens according to Example 12 of the present application.

[0199] The difference from Example 1 is that in this example, the fourth lens L4 is a convex-convex lens with a positive optical power, its first side S7 is convex, and its second side S8 is convex. The seventh lens L7 is a concave-convex lens with a positive optical power, its first side S13 is concave, and its second side S14 is convex.

[0200] Table 24 shows the basic parameters of the optical lens of Example 12. Table 25 shows the conic coefficients and higher-order term coefficients of the aspherical mirror surfaces S13 - S14 that can be used in this example.

[0201] Table 24

[0202]

[0203] Table 25

[0204] Embodiment 13

[0205] Figure 13 A schematic structural diagram of an optical lens according to Example 13 of the present application is shown.

[0206] 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.

[0207] 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.

[0208] Table 26

[0209]

[0210] Table 27

[0211]

[0212] 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, Figure 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. Figure 14 It 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.

[0213] 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.

[0214] 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.

[0215] Table 26

[0216]

[0217] Table 27

[0218]

[0219] Moreover, Examples 1 to 13 respectively satisfy the relationships shown in Table 28 and Table 29 below.

[0220] Table 28

[0221]

[0222] Table 29

[0223]

[0224] This application also provides an electronic device, which may include an optical lens according to the above embodiments of this application and an imaging element for converting the optical image formed by the optical lens into an electrical signal. The electronic device may be an independent electronic device such as a distance detection camera, or an imaging module integrated on a distance detection device. In addition, the electronic device may also be an independent imaging device such as a vehicle-mounted camera, or an imaging module integrated on an auxiliary driving system.

[0225] The above description is only the preferred embodiments of this application and the description of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions formed by the 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 technical solutions formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in this application.

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; 3.5≤TTL / F≤4.5; and 0.1≤D / H / F≤0.1808; 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, d45 is the air gap between the fourth lens and the fifth lens on the optical axis, D is the maximum effective light aperture of the first side surface of the first lens corresponding to the maximum field of view of the optical lens, and H is the image height corresponding to the maximum field of view of the optical lens.

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: 0.08≤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 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.

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: -2.2≤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; 1.25≤(R1 / D) / (R2 / D2)≤9; 1.7≤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≤ (H-F×θ) / (F×θ) ≤0.08;-0.3≤R3 / R4≤1.2;55≤(FOV×F) / H≤65;0.12≤D / H / F≤0.1808;-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)≤6.4 461; 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