Optical lens

Abstract

The invention discloses an optical lens, which is characterized by sequentially comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis, the second lens group has positive focal power; a liquid lens; the fourth lens has positive focal power; the fifth lens has negative focal power; the sixth lens has positive focal power; the seventh lens has negative focal power; the eighth lens has positive or negative focal power; wherein the second lens group sequentially comprises a second lens with positive focal power from the object side to the image side; or the second lens group sequentially comprises a second lens with positive focal power and a third lens with positive focal power from the object side to the image side; or the second lens group sequentially comprises a second lens with negative focal power and a third lens with positive focal power from the object side to the image side; the optical lens satisfies the following conditional expressions:-7.393 < = F5 / F < =-2.657; wherein F5 is the effective focal length value of the fifth lens, and F is the total effective focal length value of the optical lens.

Description

Technical Field

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

[0002] With the development of AR / VR and smart wearable technologies, smart glasses are being used more and more widely. As the core component of the optical system of smart glasses, the lens needs to meet the stringent requirements of miniaturization, lightweight, fast focusing, low power consumption, and at the same time solve the problems of purple fringing and ghosting in imaging.

[0003] Currently, existing smart glasses lenses generally suffer from being too large and heavy, making it difficult to meet the lightweight and miniaturized design requirements of smart glasses. Furthermore, traditional optical structures are prone to optical distortion defects such as purple fringing and ghosting, severely impacting image clarity and user visual comfort. In addition, existing smart glasses lenses commonly suffer from convergence / divergence conflict, meaning that autofocus cannot be achieved when the user's gaze is focused on objects at different distances, easily leading to visual fatigue and dizziness, affecting the user experience and failing to meet the high-definition imaging application requirements in various scenarios. Moreover, the combination of multiple solid-state lenses and mechanical drive structures increases lens power consumption and manufacturing costs, hindering the optimization of battery life and mass production of smart glasses.

[0004] To address the aforementioned technical challenges, liquid lens technology has gradually come into the industry's view. Without the need for complex mechanical structures, it achieves rapid focal length adjustment by changing the interface curvature of two immiscible liquids encapsulated in a micro-cavity, or by using voltage to adjust the optical liquid form wrapped in a flexible polymer film, thus meeting the needs of smart glasses.

[0005] Based on this, this application addresses the shortcomings of the existing technology by adding a liquid lens to the traditional technology, which can achieve lens miniaturization and weight reduction, reduce power consumption and focus quickly, while effectively optimizing purple fringing and ghosting problems, thus solving existing pain points. Summary of the Invention

[0006] This application provides an optical lens, which comprises, along the optical axis from the object side to the image side, the following in sequence: a first lens with negative optical power, the object side of which is convex or concave, and the image side of which is concave; a second lens group with positive optical power; a liquid lens; a fourth lens with positive optical power, the object side of which is convex, and the image side of which is convex; a fifth lens with negative optical power, the object side of which is convex, and the image side of which is concave; a sixth lens with positive optical power; a seventh lens with negative optical power; and an eighth lens with positive or negative optical power, the object side of which is convex or concave, and the image side of which is concave; the second lens group comprises, from the object side to the image side, the following in sequence: a second lens with positive optical power, the object side of which is convex, and the image side of which is concave; or a second lens group. The two lens groups, from the object side to the image side, sequentially include: a second lens with positive optical power, whose object side is concave and image side is convex; a third lens with positive optical power, whose object side is convex and image side is concave; or the two lens groups, from the object side to the image side, sequentially include: a second lens with negative optical power, whose object side is convex and image side is concave; a third lens with positive optical power, whose object side is convex and image side is either concave or convex; the optical lens consists of seven or eight solid lenses with optical power and one liquid lens; the optical lens satisfies the following condition: -7.393≤F5 / F≤-2.657; where F5 is the effective focal length of the fifth lens and F is the total effective focal length of the optical lens.

[0007] According to an exemplary embodiment of this application, the sixth lens object side of the optical lens is concave or convex, and the image side is convex; the seventh lens object side is convex, and the image side is concave; or the sixth lens object side is convex, and the image side is concave; the seventh lens object side is concave, and the image side is convex.

[0008] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following conditions: -2.386≤F1 / F≤-1.044; -24.937≤R11 / F≤11.040; -7.516≤R11 / TTL≤3.197; -0.568≤R12 / R21≤1.453; where F1 is the effective focal length of the first lens, R11 is the radius of curvature of the object side of the first lens, R12 is the radius of curvature of the image side of the first lens, R21 is the radius of curvature of the object side of the second lens, and TTL is the total optical length of the optical lens.

[0009] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following conditions: -0.558≤F1 / FC≤-0.114; 0.062≤R12 / FC≤0.315; 0.042≤T0 / FC≤0.210; 2.698≤FC / F≤12.112; where F1 is the effective focal length of the first lens, R12 is the radius of curvature of the image side of the first lens, FC is the effective focal length of the second lens group, and T0 is the center distance from the object side of the second lens to the object side of the liquid lens.

[0010] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following conditions: 0.892 ≤ R41 / F4 ≤ 2.099; 0.806 ≤ F4 / F ≤ 1.414; 11.464 mm -1 ≤(VD4-VD5) / F≤28.379 mm -1 -1.565≤R51 / F5≤-0.286; where R41 is the radius of curvature of the object side of the fourth lens, F4 is the effective focal length of the fourth lens, VD4 is the Abbe number of the fourth lens, VD5 is the Abbe number of the fifth lens, and R51 is the radius of curvature of the object side of the fifth lens.

[0011] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following conditions: 1.184≤F6 / F≤8.422; -30.377≤F7 / F≤-2.707; -9.354≤F8 / F≤4.739; -1.326≤R72 / R81≤1.434; -5.764≤FA / F≤-1.352; 0.723≤FB / F≤1.321; wherein, F6 is the effective focal length of the sixth lens, F7 is the effective focal length of the seventh lens, F8 is the effective focal length of the eighth lens, R72 is the radius of curvature of the image side of the seventh lens, R81 is the radius of curvature of the object side of the eighth lens, FA is the combined effective focal length of the first lens and the second lens group, and FB is the combined effective focal length of the fourth to the eighth lenses.

[0012] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following conditions: 0.652≤D8 / IH≤0.886; 0.834≤D1 / D8≤1.213; where D1 is the maximum effective aperture of the first lens, D8 is the maximum effective aperture of the eighth lens, and IH is the full image height of the optical lens.

[0013] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following conditions: 0.150≤T0 / TL≤0.275; 0.003≤T34 / TTL≤0.019; 2.882≤TTL / F≤3.817; 5.150≤TL / BFL≤7.978; 0.394≤T1 / T12≤0.890; wherein, T0 is the center distance from the object side of the second lens to the object side of the liquid lens, TL is the center distance from the object side of the first lens to the image side of the eighth lens, T34 is the center distance from the image side of the liquid lens to the object side of the fourth lens, TTL is the total optical length of the optical lens, BFL is the back focal length of the optical lens, T1 is the center thickness of the first lens, and T12 is the center distance from the image side of the first lens to the object side of the second lens.

[0014] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following conditions: -2.169≤F1 / F≤-1.160; -22.670≤R11 / F≤10.036; -0.507≤F1 / FC≤-0.127; 0.069≤R12 / FC≤0.286; 2.998≤FC / F≤11.011; 0.047≤T0 / FC≤0.191; 0.991≤R41 / F4≤1.908; 0.896≤F4 / F≤1.285; 12.738 mm -1 ≤(VD4-VD5) / F≤25.799 mm -1 -1.423≤R51 / F5≤-0.318; -6.721≤F5 / F≤-2.952; 1.316≤F6 / F≤7.656; -27.615≤F7 / F≤-3.008; -8.504≤F8 / F≤4.308; 0.724≤D8 / IH≤0.805; where F1 is the effective focal length of the first lens, R11 is the radius of curvature of the object-side surface of the first lens, R12 is the radius of curvature of the image-side surface of the first lens, and FC is the effective focal length of the second lens group. Effective focal length, T0 is the center distance from the object side of the second lens to the object side of the liquid lens, R41 is the radius of curvature of the object side of the fourth lens, F4 is the effective focal length of the fourth lens, VD4 is the Abbe number of the fourth lens, VD5 is the Abbe number of the fifth lens, R51 is the radius of curvature of the object side of the fifth lens, F6 is the effective focal length of the sixth lens, F7 is the effective focal length of the seventh lens, F8 is the effective focal length of the eighth lens, D8 is the maximum effective aperture of the eighth lens, and IH is the full image height of the optical lens.

[0015] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following conditions: -1.205≤R72 / R81≤1.304; -5.240≤FA / F≤-1.502; 0.803≤FB / F≤1.201; -6.833≤R11 / TTL≤2.906; 0.167≤T0 / TL≤0.250; 0.927≤D1 / D8≤1.103; 0.003≤T34 / TTL≤0.017; 3.202≤TTL / F≤3.470; 5.722≤TL / BFL≤7.253; 0.438≤T1 / T12≤0.809; -0.516≤R12 / R21≤1.321; wherein, R72 is the radius of curvature of the image-side surface of the seventh lens, and R81 is the radius of curvature of the object-side surface of the eighth lens. The curvature radius values ​​are: FA (effective focal length of the first and second lens groups), FB (effective focal length of the fourth to eighth lenses), R11 (curvature radius of the object side of the first lens), TTL (total optical length of the optical lens), T0 (center distance from the object side of the second lens to the object side of the liquid lens), TL (center distance from the object side of the first lens to the image side of the eighth lens), D1 (maximum effective aperture of the first lens), D8 (maximum effective aperture of the eighth lens), T34 (center distance from the image side of the liquid lens to the object side of the fourth lens), BFL (back focal length of the optical lens), T1 (center thickness of the first lens), T12 (center distance from the image side of the first lens to the object side of the second lens), R12 (curvature radius of the image side of the first lens), and R21 (curvature radius of the object side of the second lens).

[0016] The optical lens of this application, by reasonably setting the number of lenses (e.g., seven or eight) and matching them with a liquid lens, rationally distributes the optical power of each lens, optimizes the surface shape of each lens, and sets a reasonable parameter range, so that the optical lens provided by this application can meet the characteristics of large field of view (maximum field of view FOV=156°), small size (TTL≤9.5mm), lightweight, high resolution, as well as reduced power consumption and fast focusing. Attached Figure Description

[0017] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the structure of an optical lens according to Embodiment 1 of this application;

[0019] Figure 2 This is a schematic diagram of the structure of an optical lens according to Embodiment 2 of this application;

[0020] Figure 3This is a schematic diagram of the structure of the optical lens according to Embodiment 3 of this application;

[0021] Figure 4 This is a schematic diagram of the structure of the optical lens according to Embodiment 4 of this application;

[0022] Figure 5 This is a schematic diagram of the structure of the optical lens according to Embodiment 5 of this application;

[0023] Figure 6 This is a schematic diagram of the structure of the optical lens according to Embodiment 6 of this application;

[0024] Figure 7 This is a schematic diagram of the structure of an optical lens according to Embodiment 7 of this application. Detailed Implementation

[0025] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0026] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0027] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0028] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0029] It should also be understood that the terms "comprising," "having," "including," etc., when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when a statement such as "at least one of..." appears after a list of listed features, it modifies the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to indicate "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0030] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense, unless expressly so specified herein.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] An optical lens according to an exemplary embodiment of this application may include, in sequence along the optical axis from the object side to the image side, a first lens, a second lens group, a liquid lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens.

[0033] In an exemplary embodiment, the first lens of the optical lens has a negative focal length, with its object-side surface being either convex or concave, and its image-side surface being concave. With this configuration, when the object-side surface is convex, the first lens's meniscus shape facilitates the collection of a large field of view light into the rear optical system, increasing light transmission. Setting the first lens to a negative focal length diverges the light, resulting in a smoother transition of light path, which is beneficial for improving illumination and reducing the optical path length of the rear light, thus achieving a shorter TTL. When the object-side surface is concave, it facilitates adjusting the light angle, allowing it to collect as much large field of view light as possible into the rear optical system, resulting in higher light transmission while simultaneously reducing the sensitivity of the optical lens.

[0034] In an exemplary embodiment, the second lens group of the optical lens has positive optical power.

[0035] In an exemplary embodiment, the second lens group of the optical lens consists of a second lens with positive optical power, whose object-side surface is convex and image-side surface is concave. This configuration allows the positive optical power of the second lens to facilitate light convergence, improving lateral chromatic aberration and purple fringing caused by dispersion in the optical system, and reducing the chromatic aberration correction burden on subsequent optical systems. The convex object-side surface maximizes the collection of incident light, while the concave image-side surface facilitates the smooth entry of light into the subsequent optical system. This effectively suppresses stray light and ghosting formed by reflected light within the system while correcting aberrations, thus improving image contrast and image clarity.

[0036] In an exemplary embodiment, the second lens group of the optical lens consists of a second lens with positive optical power and a third lens with positive optical power. The object-side surface of the second lens is concave, and the image-side surface is convex; the object-side surface of the third lens is convex, and the image-side surface is concave. This configuration allows for appropriate compression of the light rays diverging from the first lens, which helps reduce the rear aperture and better balances aberrations such as spherical aberration, coma, chromatic aberration, and field curvature, thereby improving resolving power.

[0037] In an exemplary embodiment, the second lens group of the optical lens consists of a second lens with negative optical power and a third lens with positive optical power. The object-side surface of the second lens is convex, and the image-side surface is concave; the object-side surface of the third lens is convex, and the image-side surface is either convex or concave. This configuration further reduces axial and lateral chromatic aberration, improves chromatic aberration phenomena such as purple fringing, and better balances spherical aberration, coma, and field curvature, thereby improving image quality while achieving ghosting suppression and chromatic aberration correction.

[0038] In an exemplary embodiment, the second lens group is configured as a single lens, which can effectively suppress ghosting, reduce stray light, and improve chromatic aberration and purple fringing, while optimizing system aberrations and improving overall imaging performance. The second lens group is configured as two lenses, which, through reasonable allocation of optical power and coordinated aberration correction, can better balance aberrations such as spherical aberration, coma, chromatic aberration, and field curvature, resulting in higher system resolution, better imaging resolution, and better full-field imaging quality.

[0039] In an exemplary embodiment, the fourth lens of the optical lens has positive optical power, with both its object-side and image-side surfaces being convex. This configuration can further reduce aberrations and improve image quality, while also adjusting the divergence angle of light, converging light rays, making the light path smoother, and reducing the sensitivity of the system.

[0040] In an exemplary embodiment, the fifth lens of the optical lens has negative optical power, with its object-side surface being convex and its image-side surface being concave. This configuration allows the convex surface to collect light from the fourth lens, reducing the lens size; the concave surface facilitates light transmission to fit the image plane, sharing the system's optical power, and enabling the sixth lens to more flexibly control the light, thus optimizing the overall optical power configuration.

[0041] In an exemplary embodiment, the sixth lens of the optical lens has positive optical power, with its object-side surface being concave or convex and its image-side surface being convex. This configuration helps to further reduce aberrations and improve image quality; the convex image-side surface can converge light rays and adjust the height of peripheral rays on the image plane, which helps to improve CRA (Critical Aberration Reduction).

[0042] In an exemplary embodiment, the sixth lens of the optical lens has positive optical power, with a convex object-side surface and a concave image-side surface. This configuration facilitates a smooth transition of peripheral large-angle light rays to the rear optical system, effectively correcting astigmatism and field curvature, and improving the resolving power of the optical system.

[0043] In an exemplary embodiment, the seventh lens of the optical lens has negative optical power, with its object-side surface being convex and its image-side surface being concave. This configuration is beneficial for diverging light rays, and at the same time, setting the focal length of the seventh lens appropriately helps to reduce aberrations and improve image quality.

[0044] In an exemplary embodiment, the seventh lens of the optical lens has negative optical power, with its object-side surface being concave and its image-side surface being convex. This configuration facilitates the refraction of light, effectively correcting various aberrations introduced by the front positive lens, improving image quality, and reducing optical performance issues such as distortion and CRA.

[0045] In an exemplary embodiment, the eighth lens of the optical lens has positive optical power, with its object-side surface being convex and its image-side surface being concave. This arrangement facilitates the smooth entry of light into the image plane, improving resolution; it also helps to fully correct various aberrations of the optical lens, enabling the optical lens to improve resolution, reduce distortion, and optimize optical performance such as CRA while maintaining a compact structure.

[0046] In an exemplary embodiment, the eighth lens of the optical lens has negative optical power, with its object side being convex or concave and its image side being concave. This configuration facilitates the smooth entry of light into the image plane, improving resolution; it also helps to fully correct various aberrations of the optical lens, enabling the optical lens to improve resolution, reduce distortion, and optimize optical performance such as CRA while maintaining a compact structure.

[0047] In an exemplary embodiment, a liquid lens is further included between the second lens group and the fourth lens. This configuration, combined with a focal length adjustable liquid lens, enables rapid focusing and focal length adjustment without mechanical movement, and allows for aberration correction of incident light, effectively simplifying the optical system structure, reducing size and weight, and improving image quality, response speed, and system reliability.

[0048] In an exemplary embodiment, the optical lens satisfies: -2.386 ≤ F1 / F ≤ -1.044, where F1 is the effective focal length of the first lens and F is the total effective focal length of the optical lens. This setting controls the negative focal length of the first lens within a suitable range, allowing for sufficient reception of light across a wide field of view while avoiding excessive aberration correction burden on the rear lens group. This balances a wide field of view with improved aberration correction. For example, the optical lens may further satisfy -2.169 ≤ F1 / F ≤ -1.160.

[0049] In an exemplary embodiment, the optical lens satisfies: -24.937 ≤ R11 / F ≤ 11.040, where R11 is the radius of curvature of the object-side surface of the first lens, and F is the total effective focal length of the optical lens. This setting, by controlling the radius of curvature of the object-side surface of the first lens within a reasonable range, avoids aberration concentration at the edge of the first lens due to an excessively large radius of curvature, while simultaneously preventing insufficient light deflection due to an excessively small radius of curvature, which would affect the collection of large-angle light. For example, the optical lens may further satisfy -22.670 ≤ R11 / F ≤ 10.036.

[0050] In an exemplary embodiment, the optical lens satisfies: -0.558 ≤ F1 / FC ≤ -0.114, where F1 is the effective focal length of the first lens and FC is the effective focal length of the second lens group. This configuration, by rationally allocating the divergence and focusing capabilities of the first and second lens groups, ensures the optical lens's ability to receive a large field of view while improving the ghosting reflection path, reducing ghosting energy, and achieving weak ghosting. For example, the optical lens may further satisfy -0.507 ≤ F1 / FC ≤ -0.127.

[0051] In an exemplary embodiment, the optical lens satisfies: 0.062 ≤ R12 / FC ≤ 0.315, where R12 is the radius of curvature of the image-side surface of the first lens, and FC is the effective focal length of the second lens group. This setting facilitates the guidance of light rays across a wide field of view, further reducing aberrations, while ensuring sharpness and uniformity of light flux across the entire field of view. For example, the optical lens may further satisfy 0.069 ≤ R12 / FC ≤ 0.286.

[0052] In an exemplary embodiment, the optical lens satisfies: 2.698 ≤ FC / F ≤ 12.112, where FC is the effective focal length of the second lens group and F is the total effective focal length of the optical lens. This setting facilitates smooth light transmission, reduces the tolerance sensitivity of the optical lens, and helps correct chromatic aberration and aberrations in the optical system, effectively reducing the risk of ghosting and improving the lens's resolving quality. For example, the optical lens may further satisfy 2.998 ≤ FC / F ≤ 11.011.

[0053] In an exemplary embodiment, the optical lens satisfies: 0.042 ≤ T0 / FC ≤ 0.210, where T0 is the distance from the center of the object side of the second lens to the center of the object side of the liquid lens, and FC is the effective focal length of the second lens group. This setting helps reduce energy loss caused by excessive divergence of light rays at the edge of the large field of view over the long distance between the second lens group and the liquid lens, and also provides a reasonable incident angle for the liquid lens, which is beneficial for achieving fast focusing and focal length adjustment. For example, the optical lens may further satisfy 0.047 ≤ T0 / FC ≤ 0.191.

[0054] In an exemplary embodiment, the optical lens satisfies: 0.892 ≤ R41 / F4 ≤ 2.099, where R41 is the radius of curvature of the object-side surface of the fourth lens, and F4 is the effective focal length of the fourth lens. This setting avoids large aberrations when light passes through the fourth lens, thus improving resolving power. Exemplarily, the optical lens may further satisfy 0.991 ≤ R41 / F4 ≤ 1.908.

[0055] In an exemplary embodiment, the optical lens satisfies: 0.806 ≤ F4 / F ≤ 1.414, where F4 is the effective focal length of the fourth lens, and F is the total effective focal length of the optical lens. This setting reduces the degree of refraction of different light rays, reduces chromatic aberration, and suppresses purple fringing. Since the fourth lens is located in the middle of the optical lens, it can reduce the aberration correction pressure of the rear lens while offsetting the residual aberrations of the front lens group, achieving low sensitivity and minimal purple fringing in the optical lens. Exemplarily, the optical lens may further satisfy 0.896 ≤ F4 / F ≤ 1.285.

[0056] In an exemplary embodiment, the optical lens satisfies: 11.464mm. -1 ≤(VD4-VD5) / F≤28.379 mm -1 Where VD4 is the Abbe number of the fourth lens, VD5 is the Abbe number of the fifth lens, and F is the total effective focal length of the optical lens. This configuration, through the appropriate combination of lens materials, can effectively balance the axial chromatic aberration of the system and reduce the risk of purple fringing. For example, the optical lens can further meet the requirement of 12.738 mm. -1 ≤(VD4-VD5) / F≤25.799 mm -1 .

[0057] In an exemplary embodiment, the optical lens satisfies: -1.565 ≤ R51 / F5 ≤ -0.286, where R51 is the radius of curvature of the object-side surface of the fifth lens, and F5 is the effective focal length of the fifth lens. This setting ensures that light from different wavelengths is deflected within a suitable range, reducing the height difference between different wavelengths and thus reducing chromatic aberration. For example, the optical lens may further satisfy -1.423 ≤ R51 / F5 ≤ -0.318.

[0058] In an exemplary embodiment, the optical lens satisfies: -7.393 ≤ F5 / F ≤ -2.657, where F5 is the effective focal length of the fifth lens and F is the total effective focal length of the optical lens. This setting effectively balances the axial chromatic aberration of the system and reduces the risk of purple fringing. For example, the optical lens may further satisfy -6.721 ≤ F5 / F ≤ -2.952.

[0059] In an exemplary embodiment, the optical lens satisfies: 1.184 ≤ F6 / F ≤ 8.422, where F6 is the effective focal length of the sixth lens, and F is the total effective focal length of the optical lens. This setting minimizes sensitivity when light is focused onto the sixth lens, while also helping to correct aberrations caused by excessive focal length. For example, the optical lens may further satisfy 1.316 ≤ F6 / F ≤ 7.656.

[0060] In an exemplary embodiment, the optical lens satisfies: -30.377 ≤ F7 / F ≤ -2.707, where F7 is the effective focal length of the seventh lens, and F is the total effective focal length of the optical lens. This setting avoids the introduction of uncorrectable spherical aberration and astigmatism due to excessive focal length; it ensures that the light converges smoothly and stably in the final stage, effectively improving image quality. Exemplarily, the optical lens may further satisfy -27.615 ≤ F7 / F ≤ -3.008.

[0061] In an exemplary embodiment, the optical lens satisfies: -9.354 ≤ F8 / F ≤ 4.739, where F8 is the effective focal length of the eighth lens, and F is the total effective focal length of the optical lens. This setting facilitates control of the CRA (Cost Aberration Reduction), shortens the back focal length, and achieves miniaturization. As the lens closest to the image plane, the eighth lens directly affects the incident angle of the principal ray, ensuring that the light converges to the image plane at a suitable angle, avoiding vignetting, and guaranteeing uniform illumination within the field of view. Simultaneously, it can also correct residual aberrations in the front group and provide final control over the total length and back focal length of the optical lens. Exemplarily, the optical lens may further satisfy -8.504 ≤ F8 / F ≤ 4.308.

[0062] In an exemplary embodiment, the optical lens satisfies: 0.652 ≤ D8 / IH ≤ 0.886, where D8 is the maximum effective aperture of the eighth lens, and IH is the full image height of the optical lens. This setting facilitates the incidence of the principal ray with the maximum field of view onto the imaging plane, helps control the CRA (Crypt Array Reduction), and aids in light collection, ensuring sufficient light transmission. Exemplarily, the optical lens may further satisfy 0.724 ≤ D8 / IH ≤ 0.805.

[0063] In an exemplary embodiment, the optical lens satisfies: -1.326 ≤ R72 / R81 ≤ 1.434, where R72 is the radius of curvature of the image-side surface of the seventh lens, and R81 is the radius of curvature of the object-side surface of the eighth lens. This setting effectively controls the light path, elevates the light beam, and helps to better match the chip size; it also helps to achieve lens miniaturization. Exemplarily, the optical lens may further satisfy -1.205 ≤ R72 / R81 ≤ 1.304.

[0064] In an exemplary embodiment, the optical lens satisfies: -5.764 ≤ FA / F ≤ -1.352, where FA is the combined effective focal length of the first lens and the second lens group, and F is the total effective focal length of the optical lens. This configuration allows light rays from each field of view to smoothly transition to the rear of the optical lens, effectively balancing various aberrations generated by light passing through the front lens group, improving image quality, and simultaneously reducing the risk of ghosting, thus improving the lens's resolving quality. Exemplarily, the optical lens may further satisfy -5.240 ≤ FA / F ≤ -1.502.

[0065] In an exemplary embodiment, the optical lens satisfies: 0.723 ≤ FB / F ≤ 1.321, where FB is the combined effective focal length of the fourth to eighth lenses, and F is the total effective focal length of the optical lens. This setting helps control the direction of light, making the light travel more smoothly, reducing the system's sensitivity, improving the system's image quality, and further balancing the system's axial chromatic aberration, reducing the risk of purple fringing. For example, the optical lens may further satisfy 0.803 ≤ FB / F ≤ 1.201.

[0066] In an exemplary embodiment, the optical lens satisfies: -7.516 ≤ R11 / TTL ≤ 3.197, where R11 is the radius of curvature of the object-side surface of the first lens, and TTL is the total optical length of the optical lens. This setting ensures that the object-side surface of the first lens has a suitable radius of curvature, which is beneficial for controlling the angle between the light rays from the rear lens group and the reflected light rays from the object-side surface of the first lens, improving the ghost image reflection path, reducing ghost image energy, and achieving weak ghosting. Exemplarily, the optical lens may further satisfy -6.833 ≤ R11 / TTL ≤ 2.906.

[0067] In an exemplary embodiment, the optical lens satisfies: 0.150 ≤ T0 / TL ≤ 0.275, where T0 is the distance from the center of the object-side surface of the second lens group to the center of the object-side surface of the liquid lens, and TL is the distance from the center of the object-side surface of the first lens to the center of the image-side surface of the eighth lens. This setting effectively controls the light reflection path, improves the placement of ghost images in front of and behind the image, and reduces ghosting. Exemplarily, the optical lens may further satisfy 0.167 ≤ T0 / TL ≤ 0.250.

[0068] In an exemplary embodiment, the optical lens satisfies: 0.834 ≤ D1 / D8 ≤ 1.213, where D1 is the maximum effective aperture of the first lens and D8 is the maximum effective aperture of the eighth lens. This setting facilitates light transmission, increases light throughput, and simultaneously helps control the maximum aperture, achieving vertical miniaturization. Exemplarily, the optical lens may further satisfy 0.927 ≤ D1 / D8 ≤ 1.103.

[0069] In an exemplary embodiment, the optical lens satisfies: 0.003 ≤ T34 / TTL ≤ 0.019, where T34 is the center distance from the image-side of the liquid lens to the object-side of the fourth lens, and TTL is the total optical length of the optical lens. This configuration makes the light emitted from the liquid lens smoother, which is beneficial for correcting aberrations in the light entering the back-end optical system, thereby improving resolution. Exemplarily, the optical lens may further satisfy 0.003 ≤ T34 / TTL ≤ 0.017.

[0070] In an exemplary embodiment, the optical lens satisfies: 2.882 ≤ TTL / F ≤ 3.817, where TTL is the total optical length of the optical lens and F is the total effective focal length of the optical lens. This setting limits the total optical length and total effective focal length of the optical lens to a reasonable range, avoiding both insufficient spacing between the front and rear lens elements and optical path congestion due to an excessively short total optical length, and failure to meet the miniaturization requirements of the system due to an excessively long total length. For example, the optical lens may further satisfy 3.202 ≤ TTL / F ≤ 3.470.

[0071] In an exemplary embodiment, the optical lens satisfies: 5.150 ≤ TL / BFL ≤ 7.978, where TL is the center distance from the object side of the first lens to the image side of the eighth lens, and BFL is the back focal length of the optical lens. This setting is beneficial for both meeting the requirements of optical lens miniaturization and short back focal length. For example, the optical lens may further satisfy 5.722 ≤ TL / BFL ≤ 7.253.

[0072] In an exemplary embodiment, the optical lens satisfies: 0.394 ≤ T1 / T12 ≤ 0.890, where T1 is the center thickness of the first lens and T12 is the air gap between the first and second lenses. This configuration facilitates the rapid arrival of light from the second lens after it is smoothly collected by the first lens, preventing unwanted stray light from entering the optical system and achieving high resolution. Exemplarily, the optical lens may further satisfy 0.438 ≤ T1 / T12 ≤ 0.809.

[0073] In an exemplary embodiment, the optical lens satisfies: -0.568 ≤ R12 / R21 ≤ 1.453, where R12 is the radius of curvature of the image-side surface of the first lens, and R21 is the radius of curvature of the object-side surface of the second lens. This setting facilitates a smooth transition of light between the first and second lenses, thereby correcting the axial chromatic aberration of the optical lens and improving overall performance. Exemplarily, the optical lens may further satisfy -0.516 ≤ R12 / R21 ≤ 1.321.

[0074] In exemplary embodiments, this application utilizes a combination of spherical and aspherical lenses, which helps reduce the manufacturing difficulty of the lenses; simultaneously, through material combinations, a heat-free design can be achieved. This application does not specifically limit the number of spherical and aspherical lenses. When focusing on image quality, the number of aspherical lenses can be increased, or even all lenses can be aspherical. The characteristic of aspherical lenses is that their curvature changes continuously from the center to the periphery. Unlike spherical lenses, which have a constant curvature from the center to the periphery, aspherical lenses have better radius of curvature characteristics, offering advantages in improving distortion aberrations and astigmatism. By using aspherical lenses, aberrations occurring during imaging can be eliminated as much as possible, thereby improving the image quality of the lens. However, those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the lens surface type constituting the optical lens can be changed to obtain the various results and advantages described in this specification. Exemplarily, in this application, the first lens, the second lens group, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are all aspherical lenses.

[0075] Those skilled in the art will understand that plastics have a large temperature coefficient of refractive index (dn / dt) and anomalous dispersion. A suitable amount of plastic material is beneficial for high and low temperature balance, but excessive plastic lenses are detrimental to system stability. Optical lenses made of glass can suppress the shift in back focus of the optical lens due to temperature changes, thereby improving system stability. Simultaneously, using glass avoids lens blurring caused by high and low temperature changes in the operating environment, thus preventing problems affecting the normal use of the lens. Using glass also facilitates heat-free lens operation. Furthermore, using glass can better correct chromatic aberration, improve lens resolution, and reduce ghosting. As an example, in this application, the second lens group, fifth lens, sixth lens, seventh lens, and eighth lens are all made of plastic, while the first lens is made of glass.

[0076] The optical lens of this application may further include an aperture stop for limiting the light beam. The aperture stop helps to concentrate the light entering the optical lens, reduce the maximum aperture of the optical lens, and balance the off-axis aberrations of the optical system, thereby further improving the imaging quality of the optical lens. It should be noted that the aperture stop can be positioned between or to one side of any lens, depending on actual needs. For example, the aperture stop of the optical lens of this application can be positioned before or after the liquid lens, which can maximize the utilization of the liquid lens's aperture, increase the light transmission effect of the optical lens, ensure its compact structure, and reduce its overall length.

[0077] In an exemplary embodiment, the optical lens of this application employs a liquid lens. Its core principle is to achieve focal length adjustment by utilizing the variable curvature of the liquid interface: two immiscible transparent liquids with different refractive indices (such as conductive aqueous solution + insulating silicone oil) are encapsulated in a transparent cavity to form a stable meniscus (liquid-liquid interface), which serves as a dynamic refractive surface; the curvature of this interface is changed by external control (voltage / pressure), thereby changing the equivalent focal length of the lens without the need for mechanical displacement.

[0078] In an exemplary embodiment, the total optical length (TTL) of the optical lens of this application can satisfy: TTL≤9.5mm, which results in a short total optical length, compact structure, and miniaturization of the lens. Exemplarily, the total optical length (TTL) of the optical lens can further satisfy: 8.0mm≤TTL≤9.1mm.

[0079] In an exemplary embodiment, the maximum field of view (FOV) of the optical lens of this application is 156°, which ensures that the optical lens has a large field of view, effectively increasing the shooting range of the optical lens and improving the practical application value of the product. For example, the FOV of the optical lens can further satisfy: 150° ≤ FOV ≤ 156°.

[0080] The optical lens of this application has excellent resolving power. At a spatial frequency of 125 lp / mm, the MTF value of the central field of view can reach up to 0.81, and the MTF value of the peripheral field of view can reach up to 0.36, thus achieving high resolution characteristics.

[0081] Alternatively, in other alternative exemplary embodiments, the optical lens described above may also be equipped with a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0082] The optical lens provided in this application has at least one of the following characteristics: large field of view (maximum field of view FOV=156°), small size (total optical length TTL≤9.5mm), lightweight, high resolution, fast focusing, etc.

[0083] However, those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the optical lens can be changed to obtain the various results and advantages described in this specification.

[0084] Specific embodiments of the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0085] Example 1

[0086] Figure 1 A schematic diagram of the optical lens of Embodiment 1 of this application is shown. Figure 1 As shown, the optical lens includes, in sequence from the object side to the image side, a first lens L1, a second lens group LG2, a liquid lens E11, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. The second lens group LG2 contains two lenses, namely the second lens L2 and the third lens L3.

[0087] The first lens L1 has negative optical power, and its object side and image side are both concave.

[0088] The second lens L2 has positive optical power, with its object side being concave and its image side being convex.

[0089] The third lens L3 has positive optical power, with a convex object side and a concave image side.

[0090] Liquid lens E11.

[0091] The fourth lens L4 has positive optical power, and its object side and image side are both convex.

[0092] The fifth lens L5 has negative optical power, with a convex object side and a concave image side.

[0093] The sixth lens L6 has positive optical power, with its object side being concave and its image side being convex.

[0094] The seventh lens L7 has negative optical power, with a convex object side and a concave image side.

[0095] The eighth lens L8 has negative optical power, with a convex object side and a concave image side.

[0096] The optical lens also includes an aperture stop STO, which can be positioned between the liquid lens E11 and the fourth lens L4.

[0097] The optical lens may also include a filter (not shown) having an object-side and an image-side surface and / or a protective glass CG having an object-side and an image-side surface. The filter can be used to correct color aberrations, and the protective glass CG can be used to protect the image sensor chip located at the imaging plane.

[0098] Table 1 shows the basic parameters of the optical lens of Example 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0099] Table 1

[0100]

[0101] In Example 1, the object-side and image-side surfaces of the first, second, third, fourth, fifth, sixth, seventh, and eighth lenses are all aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0102] (1);

[0103] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical mirror in Example 1.

[0104] Table 2

[0105]

[0106] Example 2

[0107] Figure 2 A schematic diagram of the optical lens structure of Embodiment 2 of this application is shown. Figure 2As shown, the optical lens includes, in sequence from the object side to the image side, a first lens L1, a second lens group LG2, a liquid lens E11, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. The second lens group LG2 contains one lens, which is the second lens L2.

[0108] The first lens L1 has negative optical power, and its object side and image side are both concave.

[0109] The second lens L2 has positive optical power, with its object side being convex and its image side being concave.

[0110] Liquid lens E11.

[0111] The fourth lens L4 has positive optical power, and its object side and image side are both convex.

[0112] The fifth lens L5 has negative optical power, with a convex object side and a concave image side.

[0113] The sixth lens L6 has positive optical power, with its object side being concave and its image side being convex.

[0114] The seventh lens L7 has negative optical power, with a convex object side and a concave image side.

[0115] The eighth lens L8 has negative optical power, with a convex object side and a concave image side.

[0116] The optical lens also includes an aperture stop STO, which can be positioned between the liquid lens E11 and the fourth lens L4.

[0117] The optical lens may also include a filter (not shown) having an object-side and an image-side surface and / or a protective glass CG having an object-side and an image-side surface. The filter can be used to correct color aberrations, and the protective glass CG can be used to protect the image sensor chip located at the imaging plane.

[0118] Table 3 shows the basic parameters of the optical lens of Example 2, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0119] Table 3

[0120]

[0121] In Example 2, the object-side and image-side surfaces of the first, second, fourth, fifth, sixth, seventh, and eighth lenses are all aspherical. The surface shape of each aspherical lens can be limited by, but is not limited to, the formula (1) given in Example 1 above. Table 4 below shows the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical mirror in Example 2.

[0122] Table 4

[0123]

[0124] Example 3

[0125] Figure 3 A schematic diagram of the optical lens of Embodiment 3 of this application is shown. Figure 3 As shown, the optical lens includes, in sequence from the object side to the image side, a first lens L1, a second lens LG2, a liquid lens E11, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8 along the optical axis. The second lens group LG2 contains one lens, which is the second lens L2.

[0126] The first lens L1 has negative optical power, with its object side being convex and its image side being concave.

[0127] The second lens L2 has positive optical power, with its object side being convex and its image side being concave.

[0128] Liquid lens E11.

[0129] The fourth lens L4 has positive optical power, and its object side and image side are both convex.

[0130] The fifth lens L5 has negative optical power, with a convex object side and a concave image side.

[0131] The sixth lens L6 has positive optical power, with a convex object side and a concave image side.

[0132] The seventh lens L7 has negative optical power, with its object side being concave and its image side being convex.

[0133] The eighth lens L8 has positive optical power, with a convex object side and a concave image side.

[0134] The optical lens also includes an aperture stop STO, which can be positioned between the liquid lens E11 and the fourth lens L4.

[0135] The optical lens may also include a filter (not shown) having an object-side and an image-side surface and / or a protective glass CG having an object-side and an image-side surface. The filter can be used to correct color aberrations, and the protective glass CG can be used to protect the image sensor chip located at the imaging plane.

[0136] Table 5 shows the basic parameters of the optical lens of Example 3, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0137] Table 5

[0138]

[0139] In Example 3, the object-side and image-side surfaces of the first, second, fourth, fifth, sixth, seventh, and eighth lenses are all aspherical. The surface shape of each aspherical lens can be limited by, but is not limited to, the formula (1) given in Example 1 above. Table 6 below shows the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical mirror in Example 3.

[0140] Table 6

[0141]

[0142] Example 4

[0143] Figure 4 A schematic diagram of the optical lens of Embodiment 4 of this application is shown. Figure 4 As shown, the optical lens includes, in sequence from the object side to the image side, a first lens L1, a second lens LG2, a liquid lens E11, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. The second lens group LG2 contains two lenses, namely the second lens L2 and the third lens L3.

[0144] The first lens L1 has negative optical power, with its object side being convex and its image side being concave.

[0145] The second lens L2 has negative optical power, with its object side being convex and its image side being concave.

[0146] The third lens L3 has positive optical power, and its object side and image side are both convex.

[0147] Liquid lens E11.

[0148] The fourth lens L4 has positive optical power, and its object side and image side are both convex.

[0149] The fifth lens L5 has negative optical power, with a convex object side and a concave image side.

[0150] The sixth lens L6 has positive optical power, and its object side and image side are both convex.

[0151] The seventh lens L7 has negative optical power, with a convex object side and a concave image side.

[0152] The eighth lens L8 has negative optical power, with a convex object side and a concave image side.

[0153] The optical lens also includes an aperture stop STO, which can be set between the third lens L3 and the liquid lens E11.

[0154] The optical lens may also include a filter (not shown) having an object-side and an image-side surface and / or a protective glass CG having an object-side and an image-side surface. The filter can be used to correct color aberrations, and the protective glass CG can be used to protect the image sensor chip located at the imaging plane.

[0155] Table 7 shows the basic parameters of the optical lens of Example 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0156] Table 7

[0157]

[0158] In Example 4, the object-side and image-side surfaces of the first, second, third, fourth, fifth, sixth, seventh, and eighth lenses are all aspherical. The surface shape of each aspherical lens can be limited by, but is not limited to, the formula (1) given in Example 1 above. Table 8 below shows the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical mirror in Example 4.

[0159] Table 8

[0160]

[0161] Example 5

[0162] Figure 5 A schematic diagram of the optical lens of Embodiment 5 of this application is shown. Figure 5 As shown, the optical lens includes, in sequence from the object side to the image side, a first lens L1, a second lens LG2, a liquid lens E11, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. The second lens group LG2 contains two lenses, namely the second lens L2 and the third lens L3.

[0163] The first lens L1 has negative optical power, with its object side being convex and its image side being concave.

[0164] The second lens L2 has negative optical power, with its object side being convex and its image side being concave.

[0165] The third lens L3 has positive optical power, with a convex object side and a concave image side.

[0166] Liquid lens E11.

[0167] The fourth lens L4 has positive optical power, and its object side and image side are both convex.

[0168] The fifth lens L5 has negative optical power, with a convex object side and a concave image side.

[0169] The sixth lens L6 has positive optical power, with its object side being concave and its image side being convex.

[0170] The seventh lens L7 has negative optical power, with a convex object side and a concave image side.

[0171] The eighth lens L8 has negative optical power, with a convex object side and a concave image side.

[0172] The optical lens also includes an aperture stop STO, which can be set between the third lens L3 and the liquid lens E11.

[0173] The optical lens may also include a filter (not shown) having an object-side and an image-side surface and / or a protective glass CG having an object-side and an image-side surface. The filter can be used to correct color aberrations, and the protective glass CG can be used to protect the image sensor chip located at the imaging plane.

[0174] Table 9 shows the basic parameters of the optical lens of Example 5, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0175] Table 9

[0176]

[0177] In Example 5, the object-side and image-side surfaces of the first, second, third, fourth, fifth, sixth, seventh, and eighth lenses are all aspherical. The surface shape of each aspherical lens can be limited by, but is not limited to, the formula (1) given in Example 1 above. Table 8 below shows the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical mirror in Example 4.

[0178] Table 10

[0179]

[0180] Example 6

[0181] Figure 6 A schematic diagram of the optical lens of Embodiment 6 of this application is shown. Figure 6 As shown, the optical lens includes, in sequence from the object side to the image side, a first lens L1, a second lens LG2, a liquid lens E11, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. The second lens group LG2 contains two lenses, namely the second lens L2 and the third lens L3.

[0182] The first lens L1 has negative optical power, with its object side being convex and its image side being concave.

[0183] The second lens L2 has negative optical power, with its object side being convex and its image side being concave.

[0184] The third lens L3 has positive optical power, and its object side and image side are both convex.

[0185] Liquid lens E11.

[0186] The fourth lens L4 has positive optical power, and its object side and image side are both convex.

[0187] The fifth lens L5 has negative optical power, with a convex object side and a concave image side.

[0188] The sixth lens L6 has positive optical power, with its object side being concave and its image side being convex.

[0189] The seventh lens L7 has negative optical power, with a convex object side and a concave image side.

[0190] The eighth lens L8 has negative optical power, with a convex object side and a concave image side.

[0191] The optical lens also includes an aperture stop STO, which can be positioned between the liquid lens E11 and the fourth lens L4.

[0192] The optical lens may also include a filter (not shown) having an object-side and an image-side surface and / or a protective glass CG having an object-side and an image-side surface. The filter can be used to correct color aberrations, and the protective glass CG can be used to protect the image sensor chip located at the imaging plane.

[0193] Table 11 shows the basic parameters of the optical lens of Example 6, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0194] Table 11

[0195]

[0196] In Example 6, the object-side and image-side surfaces of the first, second, third, fourth, fifth, sixth, seventh, and eighth lenses are all aspherical. The surface shape of each aspherical lens can be limited by, but is not limited to, the formula (1) given in Example 1 above. Table 12 below shows the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical mirror in Example 6.

[0197] Table 12

[0198]

[0199] Example 7

[0200] Figure 7 A schematic diagram of the optical lens of Embodiment 7 of this application is shown. Figure 7 As shown, the optical lens includes, in sequence from the object side to the image side, a first lens L1, a second lens LG2, a liquid lens E11, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8 along the optical axis. The second lens group LG2 contains one lens, which is the second lens L2.

[0201] The first lens L1 has negative optical power, and its object side and image side are both concave.

[0202] The second lens L2 has positive optical power, with its object side being convex and its image side being concave.

[0203] Liquid lens E11.

[0204] The fourth lens L4 has positive optical power, and its object side and image side are both convex.

[0205] The fifth lens L5 has negative optical power, with a convex object side and a concave image side.

[0206] The sixth lens L6 has positive optical power, with its object side being concave and its image side being convex.

[0207] The seventh lens L7 has negative optical power, with a convex object side and a concave image side.

[0208] The eighth lens L8 has negative optical power, and its object side and image side are both concave.

[0209] The optical lens also includes an aperture stop STO, which can be positioned between the liquid lens E11 and the fourth lens L4.

[0210] The optical lens may also include a filter (not shown) having an object-side and an image-side surface and / or a protective glass CG having an object-side and an image-side surface. The filter can be used to correct color aberrations, and the protective glass CG can be used to protect the image sensor chip located at the imaging plane.

[0211] Table 13 shows the basic parameters of the optical lens of Example 7, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0212] Table 13

[0213]

[0214] In Example 7, the object-side and image-side surfaces of the first, second, fourth, fifth, sixth, seventh, and eighth lenses are all aspherical. The surface shape of each aspherical lens can be limited by, but is not limited to, the formula (1) given in Example 1 above. Table 14 below shows the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical mirror in Example 7.

[0215] Table 14

[0216]

[0217] In summary, the optical lenses in Examples 1 to 7 satisfy the relationships shown in Table 15. In each example, the parameter VD for the optical lens has no unit, while the units for other parameters are millimeters (mm).

[0218] Table 15

[0219]

[0220] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the concept of this application. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical lens, characterized in that, Along the optical axis from the object side to the image side, the following are included in sequence: A first lens with negative optical power has an object side that is either convex or concave, and an image side that is concave. A second lens group with positive optical power; Liquid lens; The fourth lens with positive optical power has a convex object-side surface and a convex image-side surface; The fifth lens with negative optical power has a convex object side and a concave image side. A sixth lens with positive optical power; A seventh lens with negative optical power; The eighth lens has positive or negative optical power, and its object-side surface is either convex or concave, while its image-side surface is concave; among them, The second lens group includes, in sequence from the object side to the image side: A second lens with positive optical power has an object-side surface that is convex and an image-side surface that is concave; or The second lens group includes, in sequence from the object side to the image side: A second lens with positive optical power has a concave object side and a convex image side. A third lens with positive optical power has a convex object-side surface and a concave image-side surface; or The second lens group includes, in sequence from the object side to the image side: A second lens with negative optical power has a convex object side and a concave image side. A third lens with positive optical power has a convex object side and a concave or convex image side. The optical lens consists of seven or eight solid lenses with optical power and one liquid lens; The optical lens satisfies the following condition: -7.393≤F5 / F≤-2.657; where F5 is the effective focal length of the fifth lens and F is the total effective focal length of the optical lens.

2. The optical lens according to claim 1, characterized in that, The sixth lens has a concave or convex object side and a convex image side; the seventh lens has a convex object side and a concave image side; or the sixth lens has a convex object side and a concave image side; the seventh lens has a concave object side and a convex image side.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies at least one of the following conditions: -2.386≤F1 / F≤-1.044; -24.937≤R11 / F≤11.040; -7.516≤R11 / TTL≤3.197; -0.568≤R12 / R21≤1.453; Wherein, F1 is the effective focal length of the first lens, R11 is the radius of curvature of the object side of the first lens, R12 is the radius of curvature of the image side of the first lens, R21 is the radius of curvature of the object side of the second lens, and TTL is the total optical length of the optical lens.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies at least one of the following conditions: -0.558≤F1 / FC≤-0.114; 0.062≤R12 / FC≤0.315; 0.042≤T0 / FC≤0.210; 2.698 ≤ FC / F ≤ 12.112; Wherein, F1 is the effective focal length of the first lens, FC is the effective focal length of the second lens group, R12 is the radius of curvature of the image side of the first lens, and T0 is the center distance from the object side of the second lens to the object side of the liquid lens.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies at least one of the following conditions: 0.892≤R41 / F4≤2.099; 0.806 ≤ F4 / F ≤ 1.414; 11.464mm -1 ≤(VD4-VD5) / F≤28.379mm -1 ; -1.565≤R51 / F5≤-0.286; Wherein, R41 is the radius of curvature of the object side of the fourth lens, F4 is the effective focal length of the fourth lens, VD4 is the Abbe number of the fourth lens, VD5 is the Abbe number of the fifth lens, and R51 is the radius of curvature of the object side of the fifth lens.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies at least one of the following conditions: 1.184≤F6 / F≤8.422; -30.377≤F7 / F≤-2.707; -9.354≤F8 / F≤4.739; -1.326≤R72 / R81≤1.434; -5.764≤FA / F≤-1.352; 0.723≤FB / F≤1.321; Wherein, F6 is the effective focal length of the sixth lens, F7 is the effective focal length of the seventh lens, F8 is the effective focal length of the eighth lens, R72 is the radius of curvature of the image side of the seventh lens, R81 is the radius of curvature of the object side of the eighth lens, FA is the combined effective focal length of the first lens and the second lens group, and FB is the combined effective focal length of the fourth lens to the eighth lens.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies at least one of the following conditions: 0.652≤D8 / IH≤0.886; 0.834≤D1 / D8≤1.213; Wherein, D1 is the maximum effective aperture of the first lens, D8 is the maximum effective aperture of the eighth lens, and IH is the full image height of the optical lens.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies at least one of the following conditions: 0.150≤T0 / TL≤0.275; 0.003≤T34 / TTL≤0.019; 2.882≤TTL / F≤3.817; 5.150≤TL / BFL≤7.978; 0.394≤T1 / T12≤0.890; Wherein, T0 is the center distance from the object side of the second lens to the center side of the liquid lens, TL is the center distance from the object side of the first lens to the image side of the eighth lens, T34 is the center distance from the image side of the liquid lens to the object side of the fourth lens, TTL is the total optical length of the optical lens, BFL is the back focal length of the optical lens, T1 is the center thickness of the first lens, and T12 is the center distance from the image side of the first lens to the object side of the second lens.

9. The optical lens according to claim 1, characterized in that, The optical lens satisfies at least one of the following conditions: -2.169≤F1 / F≤-1.160; -22.670≤R11 / F≤10.036; -0.507≤F1 / FC≤-0.127; 0.069≤R12 / FC≤0.286; 2.998 ≤ FC / F ≤ 11.011; 0.047≤T0 / FC≤0.191; 0.991≤R41 / F4≤1.908; 0.896≤F4 / F≤1.285; 12.738 mm -1 ≤(VD4-VD5) / F≤25.799 mm -1 ; -1.423≤R51 / F5≤-0.318; -6.721≤F5 / F≤-2.952; 1.316≤F6 / F≤7.656; -27.615≤F7 / F≤-3.008; -8.504≤F8 / F≤4.308; 0.724≤D8 / IH≤0.805; Wherein, F1 is the effective focal length of the first lens, R11 is the radius of curvature of the object side of the first lens, R12 is the radius of curvature of the image side of the first lens, FC is the effective focal length of the second lens group, T0 is the center distance from the object side of the second lens to the object side of the liquid lens, R41 is the radius of curvature of the object side of the fourth lens, F4 is the effective focal length of the fourth lens, VD4 is the Abbe number of the fourth lens, VD5 is the Abbe number of the fifth lens, R51 is the radius of curvature of the object side of the fifth lens, F6 is the effective focal length of the sixth lens, F7 is the effective focal length of the seventh lens, F8 is the effective focal length of the eighth lens, D8 is the maximum effective aperture of the eighth lens, and IH is the full image height of the optical lens.

10. The optical lens according to claim 1, characterized in that, The optical lens satisfies at least one of the following conditions: -1.205≤R72 / R81≤1.304; -5.240≤FA / F≤-1.502; 0.803≤FB / F≤1.201; -6.833≤R11 / TTL≤2.906; 0.167≤T0 / TL≤0.250; 0.927≤D1 / D8≤1.103; 0.003≤T34 / TTL≤0.017; 3.202≤TTL / F≤3.470; 5.722≤TL / BFL≤7.253; 0.438≤T1 / T12≤0.809; -0.516≤R12 / R21≤1.321; Wherein, R72 is the radius of curvature of the image side of the seventh lens, R81 is the radius of curvature of the object side of the eighth lens, FA is the combined effective focal length of the first lens and the second lens group, FB is the combined effective focal length of the fourth lens to the eighth lens, R11 is the radius of curvature of the object side of the first lens, TTL is the total optical length of the optical lens, T0 is the center distance from the object side of the second lens to the object side of the liquid lens, TL is the center distance from the object side of the first lens to the image side of the eighth lens, D1 is the maximum effective aperture of the first lens, D8 is the maximum effective aperture of the eighth lens, T34 is the center distance from the image side of the liquid lens to the object side of the fourth lens, BFL is the back focal length of the optical lens, T1 is the center thickness of the first lens, T12 is the center distance from the image side of the first lens to the object side of the second lens, R12 is the radius of curvature of the image side of the first lens, and R21 is the radius of curvature of the object side of the second lens.

Images