Optical lens and electronic device

Abstract

The application provides an optical lens, which comprises: a first lens with negative optical power, wherein the object side of the first lens is a convex surface, and the image side of the first lens is a concave surface; a second lens with negative optical power, wherein the object side of the second lens is a concave surface, and the image side of the second lens is a convex surface; a third lens with positive optical power, wherein the object side of the third lens is a convex surface; a fourth lens with positive optical power, wherein the object side of the fourth lens is a convex surface, and the image side of the fourth lens is a convex surface; a fifth lens with optical power; a sixth lens with optical power; and a seventh lens with optical power; wherein one of the fifth lens and the sixth lens has positive optical power, the other of the fifth lens and the sixth lens has negative optical power, and the fifth lens and the sixth lens are cemented to form a cemented lens. The application solves the problem that the optical lens in the prior art is difficult to have high resolution, miniaturization, small distortion, low cost and good temperature performance.

Description

[0001] This application is a divisional application of the invention patent filed on August 5, 2020, with application number 2020107761333 and invention title "Optical Lens and Electronic Equipment". Technical Field

[0002] This invention relates to the field of optical components, and more specifically, to an optical lens and an electronic device. Background Technology

[0003] In recent years, with the rapid development of automotive driver assistance systems, in-vehicle cameras have become the eyes of cars to acquire external information, playing an irreplaceable role. To enable in-vehicle cameras to acquire information more accurately, optical lenses need to be paired with larger, higher-resolution chips to improve image resolution.

[0004] Typically, to meet higher imaging quality requirements, the market often opts for more lens structures. However, this increases costs and significantly impacts lens miniaturization. For safety reasons, automotive lenses used in autonomous driving require high stability and must withstand various harsh environments to avoid significant performance degradation under different conditions. In particular, traffic light recognition technology is one application of automotive lenses in urban road detection. To accurately identify different colored traffic lights, the lens itself needs good chromatic aberration. Existing optical lenses suffer from severe aberrations such as chromatic aberration, astigmatism, and distortion, resulting in low resolution, poor detail rendering, and a poor user experience. Furthermore, due to the need to improve image quality, optical lenses use a large number of lenses. To meet the installation requirements in confined spaces, the back focal length of the optical lens is relatively short when miniaturizing the lens, which cannot provide sufficient focusing or installation space during module assembly. To achieve cost reduction and portability, existing technologies often use plastic lenses for optical lenses. However, the thermal expansion and contraction characteristics of plastic lenses are difficult to overcome, causing the optimal image plane of the optical lens to deviate from the chip at high and low temperatures ranging from -40℃ to 120℃, resulting in unsightly images and other adverse effects. At the same time, the high plasticity system has poor thermal stability, and the resolution cannot meet the requirements after returning from high temperature to room temperature. Summary of the Invention

[0005] The main objective of this invention is to provide an optical lens and electronic device to solve the problem that it is difficult to simultaneously achieve high resolution, miniaturization, low distortion, low cost, and good temperature performance in existing optical lenses.

[0006] To achieve the above objectives, according to one aspect of the present invention, an optical lens is provided, comprising seven lenses having optical power, the optical lens including: a first lens having negative optical power, the object-side surface of the first lens being convex and the image-side surface of the first lens being concave; a second lens having negative optical power, the object-side surface of the second lens being concave and the image-side surface of the second lens being convex; a third lens having positive optical power, the object-side surface of the third lens being convex; a fourth lens having positive optical power, the object-side surface of the fourth lens being convex and the image-side surface of the fourth lens being convex; a fifth lens having optical power; a sixth lens having optical power; and a seventh lens having optical power; wherein one of the fifth and sixth lenses has positive optical power, the other of the fifth and sixth lenses has negative optical power, and the fifth and sixth lenses are cemented together to form a cemented lens.

[0007] Furthermore, the image-side surface of the third lens is convex.

[0008] Furthermore, the image-side surface of the third lens is concave.

[0009] Furthermore, the fifth lens has negative optical power, and both the object-side and image-side surfaces of the fifth lens are concave.

[0010] Furthermore, the fifth lens has negative optical power, the object side of the fifth lens is convex, and the image side of the fifth lens is concave.

[0011] Furthermore, the fifth lens has positive optical power, and both the object-side and image-side surfaces of the fifth lens are convex.

[0012] Furthermore, the sixth lens has positive optical power, and both the object-side and image-side surfaces of the sixth lens are convex.

[0013] Furthermore, the sixth lens has negative optical power, and both the object-side and image-side surfaces of the sixth lens are concave.

[0014] Furthermore, the seventh lens has positive optical power, the object side of the seventh lens is convex in the region near the optical axis of the optical lens, and the image side of the seventh lens is concave in the region near the optical axis.

[0015] Furthermore, the seventh lens has negative optical power, the object side of the seventh lens is concave in the region near the optical axis of the optical lens, and the image side of the seventh lens is convex in the region near the optical axis.

[0016] Furthermore, the seventh lens has negative optical power, and the object side of the seventh lens is concave in the region near the optical axis of the optical lens, and the image side of the seventh lens is also concave in the region near the optical axis.

[0017] Furthermore, the seventh lens has positive optical power, and its object side is convex in the region near the optical axis, and its image side is convex in the region near the optical axis.

[0018] Furthermore, the effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: 1.5≤|F7 / F|≤14.7577.

[0019] Furthermore, the effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: 2≤|F7 / F|≤14.7577.

[0020] Furthermore, the effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: 1.5≤|F7 / F|≤6.3323.

[0021] Furthermore, the radius of curvature R3 of the object side of the second lens, the radius of curvature R4 of the image side of the second lens, and the center thickness d3 of the second lens on the optical axis of the optical lens satisfy: 1.8mm≤|R3-R4-d3|≤4.8242mm.

[0022] Furthermore, the distance TTL from the object side of the first lens to the imaging plane of the optical lens on the optical axis of the optical lens satisfies the following condition: 7.0352≤TTL / F≤9;

[0023] Furthermore, the effective focal length F+ of the lens with positive optical power in a cemented lens and the effective focal length F- of the lens with negative optical power in a cemented lens satisfy: 0.8≤|F+ / F-|≤2.5.

[0024] Furthermore, the distance T67 between the sixth and seventh lenses on the optical axis of the optical lens and the distance TTL between the object side of the first lens and the imaging surface of the optical lens on the optical axis satisfy: 0.01≤T67 / TTL≤0.1.

[0025] Furthermore, the center thickness d3 of the second lens on the optical axis of the optical lens and the distance TTL from the object side of the first lens to the imaging surface of the optical lens on the optical axis satisfy: 0.1≤d3 / TTL≤0.25.

[0026] Furthermore, the maximum field of view (FOV) of the optical lens, the total effective focal length (F) of the optical lens, and the image height (H) corresponding to the maximum field of view of the optical lens satisfy the following condition: 57.714°≤(FOV×F) / H≤65°.

[0027] Furthermore, the following conditions must be met: half-aperture D3 of the maximum aperture of the object side of the second lens corresponding to the maximum field of view of the optical lens; distance SAG3 from the intersection of the object side of the second lens and the optical axis of the optical lens to the maximum aperture of the object side of the second lens on the optical axis; half-aperture D4 of the maximum aperture of the image side of the second lens corresponding to the maximum field of view of the optical lens; and distance SAG4 from the intersection of the image side of the second lens and the optical axis to the maximum aperture of the image side of the second lens on the optical axis: 1.2685≤arctan(SAG3 / D3) / arctan(SAG4 / D4)≤2.5.

[0028] Furthermore, the distance TTL from the object side of the first lens to the imaging surface of the optical lens on the optical axis, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 3.726≤TTL / H / FOV×180°≤18.

[0029] Furthermore, the distance TTL from the object side of the first lens to the imaging surface of the optical lens on the optical axis, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 3.726≤TTL / H / FOV×180°≤9.

[0030] Furthermore, the maximum field of view (FOV) of the optical lens, the maximum aperture D of the object side of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: 1.71≤D / H / FOV×180°≤4.5.

[0031] Furthermore, the maximum field of view (FOV) of the optical lens, the maximum aperture D of the object side of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: 1.71≤D / H / FOV×180°≤3.6.

[0032] Furthermore, the refractive index Nd+ of the lens with positive optical power in a cemented lens and the Abbe number Vd+ of the lens with positive optical power in a cemented lens satisfy: 40≤Vd+ / Nd+≤66.1798.

[0033] Furthermore, the refractive index Nd+ of a lens with positive optical power in a cemented lens and the Abbe number Vd+ of a lens with positive optical power in a cemented lens satisfy the following condition: 50≤Vd+ / Nd+≤66.1798.

[0034] Furthermore, the optical lens satisfies at least one of the following conditions: 2.0884≤|F7 / F|≤14.7577, 1.9731mm≤|R3-R4-d3|≤4.8242mm, 7.0352≤TTL / F≤7.9113, 1.0053≤|F+ / F-|≤2.1311, 0.0103≤T67 / TTL≤0.05, 0.1273≤d3 / TTL≤0.1879, 57.714≤(FOV×F) / H≤62.7291, 1.2685≤ arctan(SAG3 / D3) / arctan(SAG4 / D4)≤2.2846, 3.726≤TTL / H / FOV×180°≤4.446, 1.71≤D / H / FOV×180°≤1.926, 54.5056≤Vd+ / Nd+≤66.1798, where the effective focal length of the seventh lens is F7, the total effective focal length of the optical lens is F, the radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the image-side surface of the second lens is R4, and the second lens is on the optical axis of the optical lens. The center thickness is d3. The distance on the optical axis from the object-side surface of the first lens to the imaging plane of the optical lens is TTL. The effective focal length of the cemented lens with positive optical power is F+, and the effective focal length of the cemented lens with negative optical power is F-. The distance between the sixth and seventh lenses on the optical axis is T67. The maximum field of view of the optical lens is FOV. The image height corresponding to the maximum field of view of the optical lens is H. The half-aperture of the maximum aperture of the object-side surface of the second lens corresponding to the maximum field of view of the optical lens is D3. The distance between the object-side surface of the second lens and the optical lens... The distance on the optical axis from the intersection of the optical axes to the maximum aperture of the object side of the second lens is SAG3. The half-aperture of the maximum aperture of the image side of the second lens corresponding to the maximum field of view of the optical lens is D4. The distance on the optical axis from the intersection of the image side of the second lens and the optical axis to the maximum aperture of the image side of the second lens is SAG4. The maximum aperture of the object side of the first lens corresponding to the maximum field of view of the optical lens is D. The refractive index of a cemented lens with positive optical power is Nd+. The Abbe number of a cemented lens with positive optical power is Vd+.

[0035] According to another aspect of the present invention, an electronic device is provided, including the aforementioned optical lens and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0036] In the seven-element optical lens employing the technical solution of this invention, the first lens may have negative optical power. The first lens may have a convex-concave surface. This optical power setting of the first lens can prevent excessive divergence of object-side light, which is beneficial for controlling the aperture of the rear lens and achieving a miniaturized design. This surface shape of the first lens can collect as much light as possible from a large field of view into the rear optical system, increasing the light transmission. Designing the object-side surface of the first lens as convex facilitates the sliding of water droplets in practical use environments such as rain and snow, reducing the impact on imaging. Preferably, the first lens has a high refractive index (e.g., Nd1 ≥ 1.7) and high hardness, which is beneficial for reducing the front aperture and improving image quality.

[0037] In an exemplary embodiment, the second lens may have negative optical power. The second lens may have a concave-convex surface. This optical power setting of the second lens facilitates further divergence of light rays passing through the first lens. This surface design of the second lens facilitates a smooth transition of light rays to the rear optical system. Preferably, the second lens has an aspherical mirror surface, which can improve lens resolution.

[0038] In an exemplary embodiment, the third lens may have positive optical power. The third lens may have a convex-convex or convex-concave surface. This configuration of optical power and surface shape of the third lens is beneficial for light convergence. The third lens is preferably made of a high refractive index material (Nd3 ≥ 1.65), which is beneficial for reducing the front aperture and improving image quality. Preferably, the third lens has an aspherical mirror surface, which can improve lens resolution.

[0039] In an exemplary embodiment, the fourth lens may have positive optical power. The fourth lens may have a convex-convex surface. This configuration of optical power and surface shape of the fourth lens facilitates light convergence, allowing the light to smoothly transition to the rear optical system. By controlling the effective focal length of the fourth lens, the light path from the first lens to the fourth lens can be controlled, resulting in a compact system structure. Preferably, the fourth lens has an aspherical surface, which can improve lens resolution.

[0040] In an exemplary embodiment, the seventh lens may have positive or negative optical power. The seventh lens may have a concave-convex, convex-concave, convex-convex, or concave-concave surface type. Preferably, the seventh lens has an aspherical mirror surface, which can further improve resolving quality and correct aberrations.

[0041] As is known to those skilled in the art, cemented lenses can be used to minimize or eliminate chromatic aberration. The use of cemented lenses in optical lenses can improve image quality, reduce light energy reflection loss, thereby achieving high resolution and enhancing the sharpness of the lens image. Furthermore, the use of cemented lenses can simplify the assembly process in lens manufacturing.

[0042] In an exemplary embodiment, the fifth lens and the sixth lens are cemented together to form a cemented lens. The fifth lens and the sixth lens have opposite optical powers. For example, if the fifth lens has a positive optical power, then the sixth lens has a negative optical power; or if the fifth lens has a negative optical power, then the sixth lens has a positive optical power. The lens with positive optical power is preferably a lens made of a low-refractive-index, low-dispersion material, which is beneficial for eliminating chromatic aberration. Cementing a fifth lens with a concave image side and a sixth lens with a convex object side, or cementing a fifth lens with a convex image side and a sixth lens with a concave object side, is beneficial for correcting various aberrations in the optical system, thereby improving system resolution, optimizing distortion, and improving optical performance such as CRA while maintaining a compact optical system structure. The cemented bonding method used between the lenses described above has at least one of the following advantages: reducing chromatic aberration and tolerance sensitivity, and balancing the overall chromatic aberration of the system through residual partial chromatic aberration; reducing the spacing between the two lenses, thereby reducing the overall system length; reducing the number of assembly components between lenses, thereby reducing processes and lowering costs; reducing tolerance sensitivity issues such as tilting / eccentricity of lens units during assembly, improving production yield; reducing light loss caused by inter-lens reflection, improving illumination; and further reducing field curvature, effectively correcting off-axis point aberrations of the optical lens. This cemented design shares the overall chromatic aberration correction of the system, effectively correcting aberrations to improve resolution, and making the optical system compact, meeting miniaturization requirements. Attached Figure Description

[0043] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0044] Figure 1 This is a schematic diagram illustrating the structure of an optical lens according to Embodiment 1 of this application;

[0045] Figure 2 To illustrate the structure of the optical lens according to Embodiment 2 of this application;

[0046] Figure 3 To illustrate the structure of the optical lens according to Embodiment 3 of this application;

[0047] Figure 4 This is a schematic diagram illustrating the structure of the optical lens according to Embodiment 4 of this application;

[0048] Figure 5 This is a schematic diagram illustrating the structure of the optical lens according to Embodiment 5 of this application;

[0049] Figure 6 This is a schematic diagram illustrating the structure of the optical lens according to Embodiment 6 of this application;

[0050] Figure 7 This is a schematic diagram illustrating the structure of the optical lens according to Embodiment 7 of this application;

[0051] Figure 8 To illustrate the structural schematic diagram of the optical lens according to Embodiment 8 of this application; and

[0052] Figure 9 A schematic diagram illustrating the sagitta of the object-side surface of the lens according to this application.

[0053] The above figures include the following reference numerals:

[0054] STO, Aperture Stop; L1, First Lens; S1, Object-side surface of the first lens; S2, Image-side surface of the first lens; L2, Second Lens; S3, Object-side surface of the second lens; S4, Image-side surface of the second lens; L3, Third Lens; S5, Object-side surface of the third lens; S6, Image-side surface of the third lens; L4, Fourth Lens; S8, Object-side surface of the fourth lens; S9, Image-side surface of the fourth lens; L5, Fifth Lens; S10, Object-side surface of the fifth lens; S11, Image-side surface of the fifth lens (Object-side surface of the sixth lens); L6, Sixth Lens; S12, Image-side surface of the sixth lens; L7, Seventh Lens; S13, Object-side surface of the seventh lens; S14, Image-side surface of the seventh lens; L8, Filter; S15, Object-side surface of the filter; S16, Image-side surface of the filter; L9, Protective Glass; S17, Object-side surface of the protective glass; S18, Image-side surface of the protective glass; S19 (IMA), Imaging Surface. Detailed Implementation

[0055] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0056] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0057] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0058] 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.

[0059] 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 drawn strictly to scale.

[0060] 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 side is called the image-side surface of the lens.

[0061] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0062] 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 a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0063] 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.

[0064] The features, principles and other aspects of this application are described in detail below.

[0065] In an exemplary embodiment, the optical lens includes, for example, seven lenses with 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 are arranged sequentially along the optical axis from the object side to the image side.

[0066] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the imaging surface. Optionally, the photosensitive element disposed on the imaging surface may be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS).

[0067] To address the challenge of simultaneously achieving high resolution, miniaturization, low distortion, low cost, and excellent temperature performance in existing optical lenses, this invention provides an optical lens and an electronic device.

[0068] like Figures 1 to 9 As shown, the optical lens has seven lenses with optical power, including: a first lens with negative optical power, the object side of the first lens being convex and the image side being concave; a second lens with negative optical power, the object side of the second lens being concave and the image side being convex; a third lens with positive optical power, the object side of the third lens being convex; a fourth lens with positive optical power, the object side of the fourth lens being convex and the image side being convex; a fifth lens with optical power; a sixth lens with optical power; and a seventh lens with optical power; wherein one of the fifth and sixth lenses has positive optical power, the other of the fifth and sixth lenses has negative optical power, and the fifth and sixth lenses are cemented together to form a cemented lens.

[0069] In the seven-element optical lens of this application, the first lens may have a negative optical power. The first lens may have a convex-concave surface. This optical power setting of the first lens can prevent excessive divergence of object-side light, which is beneficial for controlling the aperture of the rear lens and achieving a miniaturized design. This surface design of the first lens can collect as much light as possible from a large field of view into the rear optical system, increasing the light transmission. Designing the object-side surface of the first lens as convex facilitates the sliding off of water droplets in practical use environments such as rain and snow, reducing the impact on imaging. Preferably, the first lens has a high refractive index (e.g., Nd1 ≥ 1.7) and high hardness, which is beneficial for reducing the front aperture and improving image quality.

[0070] In an exemplary embodiment, the second lens may have negative optical power. The second lens may have a concave-convex surface. This optical power setting of the second lens facilitates further divergence of light rays passing through the first lens. This surface design of the second lens facilitates a smooth transition of light rays to the rear optical system. Preferably, the second lens has an aspherical mirror surface, which can improve lens resolution.

[0071] In an exemplary embodiment, the third lens may have positive optical power. The third lens may have a convex-convex or convex-concave surface. This configuration of optical power and surface shape of the third lens is beneficial for light convergence. The third lens is preferably made of a high refractive index material (Nd3 ≥ 1.65), which is beneficial for reducing the front aperture and improving image quality. Preferably, the third lens has an aspherical mirror surface, which can improve lens resolution.

[0072] In an exemplary embodiment, the fourth lens may have positive optical power. The fourth lens may have a convex-convex surface. This configuration of optical power and surface shape of the fourth lens facilitates light convergence, allowing the light to smoothly transition to the rear optical system. By controlling the effective focal length of the fourth lens, the light path from the first lens to the fourth lens can be controlled, resulting in a compact system structure. Preferably, the fourth lens has an aspherical surface, which can improve lens resolution.

[0073] In an exemplary embodiment, the seventh lens may have positive or negative optical power. The seventh lens may have a concave-convex, convex-concave, convex-convex, or concave-concave surface type. Preferably, the seventh lens has an aspherical mirror surface, which can further improve resolving quality and correct aberrations.

[0074] As is known to those skilled in the art, cemented lenses can be used to minimize or eliminate chromatic aberration. The use of cemented lenses in optical lenses can improve image quality, reduce light energy reflection loss, thereby achieving high resolution and enhancing the sharpness of the lens image. Furthermore, the use of cemented lenses can simplify the assembly process in lens manufacturing.

[0075] In an exemplary embodiment, the fifth lens and the sixth lens are cemented together to form a cemented lens. The fifth lens and the sixth lens have opposite optical powers. For example, if the fifth lens has a positive optical power, then the sixth lens has a negative optical power; or if the fifth lens has a negative optical power, then the sixth lens has a positive optical power. The lens with positive optical power is preferably a lens made of a low-refractive-index, low-dispersion material, which is beneficial for eliminating chromatic aberration. Cementing a fifth lens with a concave image side and a sixth lens with a convex object side, or cementing a fifth lens with a convex image side and a sixth lens with a concave object side, is beneficial for correcting various aberrations in the optical system, thereby improving system resolution, optimizing distortion, and improving optical performance such as CRA while maintaining a compact optical system structure. The cemented bonding method used between the lenses described above has at least one of the following advantages: reducing chromatic aberration and tolerance sensitivity, and balancing the overall chromatic aberration of the system through residual partial chromatic aberration; reducing the spacing between the two lenses, thereby reducing the overall system length; reducing the number of assembly components between lenses, thereby reducing processes and lowering costs; reducing tolerance sensitivity issues such as tilting / eccentricity of lens units during assembly, improving production yield; reducing light loss caused by inter-lens reflection, improving illumination; and further reducing field curvature, effectively correcting off-axis point aberrations of the optical lens. This cemented design shares the overall chromatic aberration correction of the system, effectively correcting aberrations to improve resolution, and making the optical system compact, meeting miniaturization requirements.

[0076] In an exemplary embodiment, at least two of the second, third, fourth, and seventh lenses may have aspherical surfaces, which can improve lens resolution.

[0077] In an exemplary embodiment, the effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: 1.5 ≤ |F7 / F| ≤ 14.7577, further satisfying 2 ≤ |F7 / F| ≤ 14.7577, and even further, 1.5 ≤ |F7 / F| ≤ 6.3323. Still further, 2.0884 ≤ |F7 / F| ≤ 14.7577, which helps to correct chromatic aberration in the optical lens.

[0078] In an exemplary embodiment, the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, and the center thickness d3 of the second lens on the optical axis of the optical lens satisfy: 1.8mm ≤ |R3-R4-d3| ≤ 4.8242mm. Further, 1.9731mm ≤ |R3-R4-d3| ≤ 4.8242mm. Satisfying 1.8mm ≤ |R3-R4-d3| ≤ 4.8242mm contributes to a smooth light transition and facilitates processing.

[0079] In an exemplary embodiment, the distance TTL from the object side of the first lens to the imaging surface of the optical lens on the optical axis of the optical lens satisfies the following condition: 7.0352 ≤ TTL / F ≤ 9, and further, 7.0352 ≤ TTL / F ≤ 7.9113. Satisfying 7.0352 ≤ TTL / F ≤ 9 is beneficial for miniaturization.

[0080] In an exemplary embodiment, the effective focal length F+ of the lens with positive optical power and the effective focal length F- of the lens with negative optical power in the cemented lens satisfy: 0.8 ≤ |F+ / F-| ≤ 2.5. Further, 1.0053 ≤ |F+ / F-| ≤ 2.1311. Satisfying 0.8 ≤ |F+ / F-| ≤ 2.5 ensures that the focal lengths of the lenses in the cemented component are similar, which helps to smooth the light transition and correct chromatic aberration.

[0081] In an exemplary embodiment, the distance T67 between the sixth and seventh lenses on the optical axis of the optical lens and the distance TTL between the object side of the first lens and the imaging surface of the optical lens on the optical axis satisfy: 0.01 ≤ T67 / TTL ≤ 0.1. Further, 0.0103 ≤ T67 / TTL ≤ 0.05. Satisfying 0.01 ≤ T67 / TTL ≤ 0.1 facilitates the assembly of the optical lens and helps improve ghosting.

[0082] In an exemplary embodiment, the center thickness d3 of the second lens on the optical axis and the distance TTL from the object side of the first lens to the imaging plane of the optical lens on the optical axis satisfy the following condition: 0.1 ≤ d3 / TTL ≤ 0.25. Further, 0.1273 ≤ d3 / TTL ≤ 0.1879. Satisfying 0.1 ≤ d3 / TTL ≤ 0.25 helps the light to pass smoothly through the second lens.

[0083] In an exemplary embodiment, the maximum field of view (FOV) of the optical lens, the total effective focal length (F) of the optical lens, and the image height (H) corresponding to the maximum field of view of the optical lens satisfy the following condition: 57.714° ≤ (FOV × F) / H ≤ 65°. Further, 57.714 ≤ (FOV × F) / H ≤ 62.7291. Satisfying 57.714° ≤ (FOV × F) / H ≤ 65° is beneficial for the optical lens to have lower distortion, allowing it to be matched with larger chips.

[0084] In an exemplary embodiment, the half-aperture D3 of the maximum light-transmitting aperture of the object-side surface of the second lens corresponding to the maximum field of view of the optical lens, the distance SAG3 from the intersection of the object-side surface of the second lens and the optical axis of the optical lens to the maximum light-transmitting aperture SAG4 of the object-side surface of the second lens, the half-aperture D4 of the maximum light-transmitting aperture of the image-side surface of the second lens corresponding to the maximum field of view of the optical lens, and the distance SAG4 from the intersection of the image-side surface of the second lens and the optical axis to the maximum light-transmitting aperture SAG4 of the image-side surface of the second lens satisfy: 1.2685≤arctan(SAG3 / D3) / arctan(SAG4 / D4)≤2.5. Further, 1.2685≤arctan(SAG3 / D3) / arctan(SAG4 / D4)≤2.2846. Satisfying 1.2685≤arctan(SAG3 / D3) / arctan(SAG4 / D4)≤2.5 is beneficial for smoothing the transition of peripheral light and reducing lens sensitivity.

[0085] In an exemplary embodiment, the distance TTL from the object side of the first lens to the imaging surface of the optical lens on the optical axis, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following: 3.726 ≤ TTL / H / FOV × 180° ≤ 18. Further, 3.726 ≤ TTL / H / FOV × 180° ≤ 9. Even further, 3.726 ≤ TTL / H / FOV × 180° ≤ 4.446. Satisfying 3.726 ≤ TTL / H / FOV × 180° ≤ 18 is beneficial for miniaturization, allowing for a smaller optical lens size with the same imaging surface and image height.

[0086] In an exemplary embodiment, the maximum field of view (FOV) of the optical lens, the maximum aperture D of the object-side surface of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy the following: 1.71 ≤ D / H / FOV × 180° ≤ 4.5. Further, 1.71 ≤ D / H / FOV × 180° ≤ 3.6. Even further, 1.71 ≤ D / H / FOV × 180° ≤ 1.926. Satisfying 1.71 ≤ D / H / FOV × 180° ≤ 3.6 is beneficial for a smaller front aperture.

[0087] In an exemplary embodiment, the refractive index Nd+ of the lens with positive optical power in the cemented lens and the Abbe number Vd+ of the lens with positive optical power in the cemented lens satisfy the following: 40 ≤ Vd+ / Nd+ ≤ 66.1798. Further, 50 ≤ Vd+ / Nd+ ≤ 66.1798. Even further, 54.5056 ≤ Vd+ / Nd+ ≤ 66.1798. Satisfying 40 ≤ Vd+ / Nd+ ≤ 66.1798 makes it preferable that the lens with positive optical power in the cemented component is made of a material with ultra-low refractive index and ultra-low dispersion, which is beneficial for correcting chromatic aberration.

[0088] In an exemplary embodiment, an aperture stop may be provided between the third lens and the fourth lens to limit the light beam and further improve the imaging quality of the optical lens. Placing the aperture stop between the third and fourth lenses is advantageous for increasing the aperture diameter, effectively converging the light entering the optical lens, and reducing the lens aperture. In this embodiment, the aperture stop may be located near the image-side of the third lens or near the object-side of the fourth lens. However, it should be noted that the positions of the aperture stop disclosed herein are merely examples and not limitations; in alternative embodiments, the aperture stop may be placed at other positions as needed.

[0089] In an exemplary embodiment, the optical lens according to this application may further include, as needed, a filter disposed between the seventh lens and the imaging surface to filter light of different wavelengths. The optical lens according to this application may also include a protective glass disposed between the seventh lens and the imaging surface to prevent damage to the image-side elements (e.g., a chip) of the optical lens.

[0090] In an exemplary embodiment, all of the first, second, third, fourth, fifth, sixth, and seventh lenses may have aspherical mirror surfaces. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike spherical lenses, which have a constant curvature from their center to their periphery, aspherical lenses have superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. Using aspherical lenses can minimize aberrations that occur during imaging, thereby improving the lens's image quality. The inclusion of aspherical lenses helps correct system aberrations and improves resolving power. Specifically, at least one of the first, second, third, fourth, fifth, sixth, and seventh lenses is an aspherical lens, which is beneficial for improving the resolving quality of the optical system.

[0091] The optical lens according to the above-described embodiments of this application, through the rational setting of the shape and power of each lens, achieves at least one beneficial effect of the optical system using only 7 lenses, including low chromatic aberration, high resolution (up to 8 megapixels or more), miniaturization, low distortion, small front aperture, low ghosting, and good image quality. Simultaneously, the optical system also meets the low-cost requirements of small lens size, low sensitivity, and high production yield. This optical lens also has a long focal length and a large angular resolution in the central region, which can improve the recognition of environmental objects and specifically increase the detection area in the central part. Furthermore, this optical lens has excellent temperature adaptability, minimal changes in imaging effect under high and low temperature environments, and stable image quality.

[0092] The optical lens according to the above embodiments of this application, by setting a cemented lens, shares the overall chromatic aberration correction of the system, which is beneficial for correcting system aberrations, improving system resolution quality, reducing fit sensitivity issues, and making the overall structure of the optical system compact, thus meeting the miniaturization requirements.

[0093] In an exemplary embodiment, the first to seventh lenses in the optical lens can all be made of glass. Optical lenses made of glass can suppress the shift in the back focus of the optical lens due to temperature changes, thereby improving system stability. At the same time, using glass can avoid lens blurring caused by high and low temperature changes in the operating environment, thus preventing the normal use of the lens. Specifically, when resolving quality and reliability are of primary concern, the first to seventh lenses can all be aspherical glass lenses. Of course, in applications where temperature stability requirements are lower, the first to seventh lenses in the optical lens can also be made of plastic. Using plastic to make optical lenses can effectively reduce manufacturing costs.

[0094] However, those skilled in the art will understand that the number of lenses constituting the lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although seven lenses are described as an example in the embodiments, the optical lens is not limited to including seven lenses. If desired, the optical lens may also include other numbers of lenses.

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

[0096] Example 1

[0097] The following is for reference Figure 1 The optical lens according to Embodiment 1 of this application is described. Figure 1 A schematic diagram of the structure of an optical lens according to Embodiment 1 of this application is shown.

[0098] like Figure 1As shown, the optical lens includes, in sequence from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 along the optical axis.

[0099] The first lens L1 is a convex-concave lens with negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens L2 is a concave-convex lens with negative optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens L3 is a biconvex lens with positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens L4 is a biconvex lens with positive optical power, its object-side surface S8 is convex, and its image-side surface S9 is convex. The fifth lens L5 is a biconcave lens with negative optical power, its object-side surface S10 is concave, and its image-side surface S11 is concave. The sixth lens L6 is a biconvex lens with positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is convex. The seventh lens L7 has positive optical power and is a convex-concave lens near the optical axis. Its object-side surface S13 is convex near the optical axis, and its image-side surface S14 is concave near the optical axis. The fifth lens L5 and the sixth lens L6 can be cemented together to form a cemented lens.

[0100] The optical lens may also include an aperture stop STO, which may be positioned between the third lens L3 and the fourth lens L4 to improve image quality. For example, the aperture stop STO may be positioned close to the image-side surface S6 of the third lens L3.

[0101] Optionally, the optical lens may also include a filter L8 having an object-side surface S15 and an image-side surface S16, which can be used to correct color aberrations. The optical lens may also include a protective glass L9 having an object-side surface S17 and an image-side surface S18, which can be used to protect the image sensor chip IMA located at the imaging surface S19. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged on the imaging surface S19.

[0102] Table 1 shows the radius of curvature R, thickness d / distance T (it should be understood that the thickness d / distance T in the row where S1 is located is the center thickness d1 of the first lens L1, the thickness d / distance T in the row where S2 is located is the distance T12 between the first lens L1 and the second lens L2, and so on), refractive index Nd, and Abbe number Vd of each lens of the optical lens of Embodiment 1.

[0103]

[0104]

[0105] Table 1

[0106] In Embodiment 1, the object-side surface S5 and image-side surface S6 of the third lens L3, and the object-side surface S13 and image-side surface S14 of the seventh lens L7, can all be aspherical surfaces. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0107]

[0108] Where x is the distance vector from the vertex of the aspherical surface at a height of 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 the aspherical mirrors S5, S6, S13 and S14 in Example 1.

[0109] Face number k A4 A6 A8 A10 A12 A14 A16 S5 0.3293 2.5755E-05 6.8127E-06 -1.0898E-06 2.3276E-07 -2.2212E-08 1.0819E-09 -2.1174E-11 S6 -153.1859 5.5603E-04 -2.3146E-05 9.4222E-06 -1.2849E-06 9.2896E-08 -2.7591E-09 5.0835E-12 S13 13.0558 -1.8693E-03 -2.8700E-05 -7.7638E-06 2.0232E-06 -2.5180E-07 1.6134E-08 -4.7997E-10 S14 -103.9655 2.4359E-04 -2.8649E-04 4.6375E-05 -5.5629E-06 4.2192E-07 -1.7670E-08 3.0788E-10

[0110] Table 2

[0111] Example 2

[0112] The following is for reference Figure 2 An optical lens according to Embodiment 2 of this application is described. Figure 2 A schematic diagram of the structure of an optical lens according to Embodiment 2 of this application is shown.

[0113] like Figure 2 As shown, the optical lens includes, in sequence from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 along the optical axis.

[0114] The first lens L1 is a convex-concave lens with negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens L2 is a concave-convex lens with negative optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens L3 is a biconvex lens with positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens L4 is a biconvex lens with positive optical power, its object-side surface S8 is convex, and its image-side surface S9 is convex. The fifth lens L5 is a biconcave lens with negative optical power, its object-side surface S10 is concave, and its image-side surface S11 is concave. The sixth lens L6 is a biconvex lens with positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is convex. The seventh lens L7 has positive optical power and is a convex-concave lens near the optical axis. Its object-side surface S13 is convex near the optical axis, and its image-side surface S14 is concave near the optical axis. The fifth lens L5 and the sixth lens L6 can be cemented together to form a cemented lens.

[0115] The optical lens may also include an aperture stop STO, which may be positioned between the third lens L3 and the fourth lens L4 to improve image quality. For example, the aperture stop STO may be positioned close to the image-side surface S6 of the third lens L3.

[0116] Optionally, the optical lens may also include a filter L8 having an object-side surface S15 and an image-side surface S16, which can be used to correct color aberrations. The optical lens may also include a protective glass L9 having an object-side surface S17 and an image-side surface S18, which can be used to protect the image sensor chip IMA located at the imaging surface S19. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged on the imaging surface S19.

[0117] Table 3 shows the radius of curvature R, thickness d / distance T, refractive index Nd, and Abbe number Vd of each lens in the optical lens of Example 2. Table 4 shows the conic coefficients and higher-order coefficients that can be used for each aspherical mirror in Example 2, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0118]

[0119]

[0120] Table 3

[0121] Face number k A4 A6 A8 A10 A12 A14 A16 S5 1.2211 2.85E-05 7.12E-06 -1.20E-06 2.63E-07 -2.58E-08 1.30E-09 -2.53E-11 S6 -149.0383 5.71E-04 -2.47E-05 1.04E-05 -1.45E-06 1.08E-07 -3.27E-09 7.61E-12 S13 13.0167 -1.95E-03 -3.12E-05 -8.60E-06 2.28E-06 -2.93E-07 1.93E-08 -5.66E-10 S14 -101.6136 2.57E-04 -3.06E-04 5.11E-05 -6.28E-06 4.91E-07 -2.11E-08 3.77E-10

[0122] Table 4

[0123] Example 3

[0124] The following is for reference Figure 3 An optical lens according to Embodiment 3 of this application is described. Figure 3 A schematic diagram of the structure of an optical lens according to Embodiment 3 of this application is shown.

[0125] like 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 L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 along the optical axis.

[0126] The first lens L1 is a convex-concave lens with negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens L2 is a concave-convex lens with negative optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens L3 is a biconvex lens with positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens L4 is a biconvex lens with positive optical power, its object-side surface S8 is convex, and its image-side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative optical power, its object-side surface S10 is convex, and its image-side surface S11 is concave. The sixth lens L6 is a biconvex lens with positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is convex. The seventh lens L7 has negative optical power and is a concave-convex lens in the region near the optical axis. Its object-side surface S13 is concave in the region near the optical axis, and its image-side surface S14 is convex in the region near the optical axis. The fifth lens L5 and the sixth lens L6 can be cemented together to form a cemented lens.

[0127] The optical lens may also include an aperture stop STO, which may be positioned between the third lens L3 and the fourth lens L4 to improve image quality. For example, the aperture stop STO may be positioned close to the image-side surface S6 of the third lens L3.

[0128] Optionally, the optical lens may also include a filter L8 having an object-side surface S15 and an image-side surface S16, which can be used to correct color aberrations. The optical lens may also include a protective glass L9 having an object-side surface S17 and an image-side surface S18, which can be used to protect the image sensor chip IMA located at the imaging surface S19. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged on the imaging surface S19.

[0129] Table 5 shows the radius of curvature R, thickness d / distance T, refractive index Nd, and Abbe number Vd of each lens in the optical lens of Example 3. Table 6 shows the conic coefficients and higher-order coefficients that can be used for each aspherical mirror in Example 3, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0130]

[0131] Table 5

[0132] Face number k A4 A6 A8 A10 A12 A14 A16 S5 0.0597 3.01E-04 1.67E-05 2.61E-07 -2.26E-08 -3.59E-11 1.92E-13 3.08E-13 S6 0.0877 1.01E-03 2.22E-05 1.01E-06 -1.32E-08 7.49E-11 3.85E-13 -8.67E-13 S13 -3.3721 9.32E-05 2.81E-05 -4.68E-06 4.68E-07 -4.90E-08 2.33E-09 -3.60E-11 S14 -97.7499 1.89E-04 9.70E-05 -1.23E-05 4.37E-07 4.51E-08 -5.47E-09 1.58E-10

[0133] Table 6

[0134] Example 4

[0135] The following is for reference Figure 4 An optical lens according to Embodiment 4 of this application is described. Figure 4 A schematic diagram of the structure of an optical lens according to Embodiment 4 of this application is shown.

[0136] like 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 L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 along the optical axis.

[0137] The first lens L1 is a convex-concave lens with negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens L2 is a concave-convex lens with negative optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens L3 is a biconvex lens with positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens L4 is a biconvex lens with positive optical power, its object-side surface S8 is convex, and its image-side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative optical power, its object-side surface S10 is convex, and its image-side surface S11 is concave. The sixth lens L6 is a biconvex lens with positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is convex. The seventh lens L7 has negative optical power and is a concave-convex lens in the region near the optical axis. Its object-side surface S13 is concave in the region near the optical axis, and its image-side surface S14 is convex in the region near the optical axis. The fifth lens L5 and the sixth lens L6 can be cemented together to form a cemented lens.

[0138] The optical lens may also include an aperture stop STO, which may be positioned between the third lens L3 and the fourth lens L4 to improve image quality. For example, the aperture stop STO may be positioned close to the image-side surface S6 of the third lens L3.

[0139] Optionally, the optical lens may also include a filter L8 having an object-side surface S15 and an image-side surface S16, which can be used to correct color aberrations. The optical lens may also include a protective glass L9 having an object-side surface S17 and an image-side surface S18, which can be used to protect the image sensor chip IMA located at the imaging surface S19. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged on the imaging surface S19.

[0140] Table 7 shows the radius of curvature R, thickness d / distance T, refractive index Nd, and Abbe number Vd of each lens in the optical lens of Example 4. Table 8 shows the conic coefficients and higher-order coefficients that can be used for each aspherical mirror in Example 4, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0141]

[0142]

[0143] Table 7

[0144] Face number k A4 A6 A8 A10 A12 A14 A16 S5 0.1634 3.03E-04 1.67E-05 2.54E-07 -2.28E-08 -3.13E-11 2.08E-12 3.95E-13 S6 0.1627 1.01E-03 2.23E-05 1.03E-06 -1.13E-08 1.65E-10 -3.87E-12 -2.54E-12 S13 -3.3856 9.37E-05 2.76E-05 -4.73E-06 4.68E-07 -4.88E-08 2.35E-09 -3.51E-11 S14 -96.3054 1.87E-04 9.69E-05 -1.23E-05 4.36E-07 4.51E-08 -5.46E-09 1.59E-10

[0145] Table 8

[0146] Example 5

[0147] The following is for reference Figure 5 An optical lens according to Embodiment 5 of this application is described. Figure 5 A schematic diagram of the structure of an optical lens according to Embodiment 5 of this application is shown.

[0148] like 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 L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 along the optical axis.

[0149] The first lens L1 is a convex-concave lens with negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens L2 is a concave-convex lens with negative optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens L3 is a biconvex lens with positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens L4 is a biconvex lens with positive optical power, its object-side surface S8 is convex, and its image-side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative optical power, its object-side surface S10 is convex, and its image-side surface S11 is concave. The sixth lens L6 is a biconvex lens with positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is convex. The seventh lens L7 has negative optical power and is a biconcave lens near the optical axis. Its object-side surface S13 is concave near the optical axis, and its image-side surface S14 is concave near the optical axis. The fifth lens L5 and the sixth lens L6 can be cemented together to form a cemented lens.

[0150] The optical lens may also include an aperture stop STO, which may be positioned between the third lens L3 and the fourth lens L4 to improve image quality. For example, the aperture stop STO may be positioned close to the image-side surface S6 of the third lens L3.

[0151] Optionally, the optical lens may also include a filter L8 having an object-side surface S15 and an image-side surface S16, which can be used to correct color aberrations. The optical lens may also include a protective glass L9 having an object-side surface S17 and an image-side surface S18, which can be used to protect the image sensor chip IMA located at the imaging surface S19. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged on the imaging surface S19.

[0152] Table 9 shows the radius of curvature R, thickness d / distance T, refractive index Nd, and Abbe number Vd of each lens in the optical lens of Example 5. Table 10 shows the conic coefficients and higher-order coefficients that can be used for each aspherical mirror in Example 5, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0153]

[0154]

[0155] Table 9

[0156] Face number k A4 A6 A8 A10 A12 A14 A16 S5 -0.0301 3.33E-04 1.82E-05 -1.25E-08 -6.62E-09 5.48E-10 7.95E-11 -5.26E-12 S6 -1.2177 1.11E-03 2.70E-05 4.59E-07 2.79E-08 6.43E-10 3.46E-11 -8.73E-12 S13 2.3184 -3.00E-03 7.83E-05 -2.85E-06 5.07E-07 -5.97E-08 1.02E-09 6.54E-11 S14 -99.441 -2.22E-03 1.44E-04 -1.10E-05 4.29E-07 4.14E-08 -5.49E-09 1.68E-10

[0157] Table 10

[0158] Example 6

[0159] The following is for reference Figure 6 An optical lens according to Embodiment 6 of this application is described. Figure 6 A schematic diagram of the structure of an optical lens according to Embodiment 6 of this application is shown.

[0160] like 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 L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 along the optical axis.

[0161] The first lens L1 is a convex-concave lens with negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens L2 is a concave-convex lens with negative optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens L3 is a biconvex lens with positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens L4 is a biconvex lens with positive optical power, its object-side surface S8 is convex, and its image-side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative optical power, its object-side surface S10 is convex, and its image-side surface S11 is concave. The sixth lens L6 is a biconvex lens with positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is convex. The seventh lens L7 has negative optical power and is a biconcave lens near the optical axis. Its object-side surface S13 is concave near the optical axis, and its image-side surface S14 is concave near the optical axis. The fifth lens L5 and the sixth lens L6 can be cemented together to form a cemented lens.

[0162] The optical lens may also include an aperture stop STO, which may be positioned between the third lens L3 and the fourth lens L4 to improve image quality. For example, the aperture stop STO may be positioned close to the image-side surface S6 of the third lens L3.

[0163] Optionally, the optical lens may also include a filter L8 having an object-side surface S15 and an image-side surface S16, which can be used to correct color aberrations. The optical lens may also include a protective glass L9 having an object-side surface S17 and an image-side surface S18, which can be used to protect the image sensor chip IMA located at the imaging surface S19. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged on the imaging surface S19.

[0164] Table 11 shows the radius of curvature R, thickness d / distance T, refractive index Nd, and Abbe number Vd of each lens in the optical lens of Example 6. Table 12 shows the parameters that can be used in Example 6.

[0165] The conic coefficient and higher-order coefficient of the mirror surface, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0166]

[0167] Table 11

[0168] Face number k A4 A6 A8 A10 A12 A14 A16 S5 -0.0267 3.34E-04 1.82E-05 -1.01E-08 -6.52E-09 5.49E-10 7.92E-11 -5.31E-12 S6 -1.2763 1.11E-03 2.70E-05 4.62E-07 2.82E-08 6.54E-10 3.39E-11 -8.91E-12 S13 2.2144 -3.00E-03 7.84E-05 -2.85E-06 5.07E-07 -5.98E-08 1.01E-09 6.70E-11 S14 -99.7213 -2.23E-03 1.44E-04 -1.10E-05 4.29E-07 4.14E-08 -5.49E-09 1.68E-10

[0169] Table 12

[0170] Example 7

[0171] The following is for reference Figure 7 An optical lens according to Embodiment 7 of this application is described. Figure 7 A schematic diagram of the structure of an optical lens according to Embodiment 7 of this application is shown.

[0172] like 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 L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 along the optical axis.

[0173] The first lens L1 is a convex-concave lens with negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens L2 is a concave-convex lens with negative optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens L3 is a convex-concave lens with positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens L4 is a biconvex lens with positive optical power, its object-side surface S8 is convex, and its image-side surface S9 is convex. The fifth lens L5 is a biconvex lens with positive optical power, its object-side surface S10 is convex, and its image-side surface S11 is convex. The sixth lens L6 is a biconcave lens with negative optical power, its object-side surface S11 is concave, and its image-side surface S12 is concave. The seventh lens L7 has positive optical power and is a biconvex lens near the optical axis. Its object-side surface S13 is convex near the optical axis, and its image-side surface S14 is convex near the optical axis. The fifth lens L5 and the sixth lens L6 can be cemented together to form a cemented lens.

[0174] The optical lens may also include an aperture stop STO, which may be positioned between the third lens L3 and the fourth lens L4 to improve image quality. For example, the aperture stop STO may be positioned close to the object side S8 of the fourth lens L4.

[0175] Optionally, the optical lens may also include a filter L8 having an object-side surface S15 and an image-side surface S16, which can be used to correct color aberrations. The optical lens may also include a protective glass L9 having an object-side surface S17 and an image-side surface S18, which can be used to protect the image sensor chip IMA located at the imaging surface S19. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged on the imaging surface S19.

[0176] Table 13 shows the radius of curvature R, thickness d / distance T, refractive index Nd, and Abbe number Vd of each lens in the optical lens of Example 7. Table 14 shows the conic coefficients and higher-order coefficients that can be used for each aspherical mirror in Example 7, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0177]

[0178]

[0179] Table 13

[0180] Face number k A4 A6 A8 A10 A12 A14 A16 S3 0.7543 7.31E-06 1.22E-05 -1.10E-06 1.49E-07 -1.07E-08 4.18E-10 -6.62E-12 S4 -0.4831 -1.62E-06 1.65E-06 8.07E-08 -1.01E-08 5.14E-10 -1.18E-11 1.06E-13 S13 -3.5799 1.44E-04 2.08E-05 -8.64E-07 4.14E-07 -4.48E-08 2.13E-09 -3.47E-11 S14 -201.6206 -1.23E-03 1.98E-04 -1.56E-05 6.26E-07 4.18E-08 -4.94E-09 1.41E-10

[0181] Table 14

[0182] Example 8

[0183] The following is for reference Figure 8 An optical lens according to Embodiment 8 of this application is described. Figure 8 A schematic diagram of the structure of an optical lens according to Embodiment 8 of this application is shown.

[0184] like Figure 8 As shown, the optical lens includes, in sequence from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 along the optical axis.

[0185] The first lens L1 is a convex-concave lens with negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens L2 is a concave-convex lens with negative optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens L3 is a convex-concave lens with positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens L4 is a biconvex lens with positive optical power, its object-side surface S8 is convex, and its image-side surface S9 is convex. The fifth lens L5 is a biconvex lens with positive optical power, its object-side surface S10 is convex, and its image-side surface S11 is convex. The sixth lens L6 is a biconcave lens with negative optical power, its object-side surface S11 is concave, and its image-side surface S12 is concave. The seventh lens L7 has positive optical power and is a biconvex lens near the optical axis. Its object-side surface S13 is convex near the optical axis, and its image-side surface S14 is convex near the optical axis. The fifth lens L5 and the sixth lens L6 can be cemented together to form a cemented lens.

[0186] The optical lens may also include an aperture stop STO, which may be positioned between the third lens L3 and the fourth lens L4 to improve image quality. For example, the aperture stop STO may be positioned close to the object side S8 of the fourth lens L4.

[0187] Optionally, the optical lens may also include a filter L8 having an object-side surface S15 and an image-side surface S16, which can be used to correct color aberrations. The optical lens may also include a protective glass L9 having an object-side surface S17 and an image-side surface S18, which can be used to protect the image sensor chip IMA located at the imaging surface S19. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged on the imaging surface S19.

[0188] Table 15 shows the radius of curvature R, thickness d / distance T, refractive index Nd, and Abbe number Vd of each lens in the optical lens of Example 8. Table 16 shows the conic coefficients and higher-order coefficients that can be used for each aspherical mirror in Example 8, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0189]

[0190] Table 15

[0191]

[0192]

[0193] Table 16

[0194] In summary, Examples 1 to 8 satisfy the relationships shown in Tables 17-1 and 17-2 below. In Tables 17-1 and 17-2, the units of TTL, F, H, D, F-, F+, F7, F1, F2, F3, F4, T67, R3, R4, d3, D3, D4, SAG3, and SAG4 are millimeters (mm), and the unit of FOV is degrees (°).

[0195]

[0196]

[0197] Table 17-1

[0198]

[0199]

[0200] Table 17-2

[0201] This application also provides an electronic device that may include an optical lens according to the above embodiments of this application and an imaging element for converting an optical image formed by the optical lens into an electrical signal. The electronic device may be a stand-alone electronic device, such as a rangefinder camera, or an imaging module integrated into a rangefinder device. Furthermore, the electronic device may also be a stand-alone imaging device, such as an in-vehicle camera, or an imaging module integrated into a driver assistance system, such as a vehicle-mounted camera.

[0202] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical lens, characterized in that, The optical lens has seven lenses with optical power, and the optical lens includes: A first lens with negative optical power, wherein the object side of the first lens is convex and the image side of the first lens is concave. A second lens with negative optical power, wherein the object side of the second lens is concave and the image side of the second lens is convex; A third lens with positive optical power, wherein the object side of the third lens is convex; A fourth lens with positive optical power, wherein the object-side surface of the fourth lens is convex and the image-side surface of the fourth lens is convex. A fifth lens with negative optical power; A sixth lens with positive optical power; A seventh lens with optical power; The fifth lens and the sixth lens are cemented together to form a cemented lens; The radius of curvature R3 of the object side of the second lens, the radius of curvature R4 of the image side of the second lens, and the center thickness d3 of the second lens on the optical axis of the optical lens satisfy: 1.8mm≤|R3-R4-d3|≤4.8242mm.

2. The optical lens according to claim 1, characterized in that, The image-side surface of the third lens is convex.

3. The optical lens according to claim 1, characterized in that, The image-side surface of the third lens is concave.

4. The optical lens according to claim 1, characterized in that, The object-side surface of the fifth lens is concave, and the image-side surface of the fifth lens is also concave.

5. The optical lens according to claim 1, characterized in that, The object-side surface of the fifth lens is convex, and the image-side surface of the fifth lens is concave.

6. The optical lens according to claim 1, characterized in that, The object-side surface of the sixth lens is convex, and the image-side surface of the sixth lens is also convex.

7. The optical lens according to claim 1, characterized in that, The seventh lens has positive optical power, the object side of the seventh lens is convex in the region near the optical axis of the optical lens, and the image side of the seventh lens is concave in the region near the optical axis.

8. The optical lens according to claim 1, characterized in that, The seventh lens has negative optical power, the object side of the seventh lens is concave in the region near the optical axis of the optical lens, and the image side of the seventh lens is convex in the region near the optical axis.

9. The optical lens according to claim 1, characterized in that, The seventh lens has negative optical power, the object side of the seventh lens is concave in the region near the optical axis of the optical lens, and the image side of the seventh lens is concave in the region near the optical axis.

10. The optical lens according to claim 1, characterized in that, The seventh lens has positive optical power, and the object-side surface of the seventh lens is convex in the region near the optical axis of the optical lens, and the image-side surface of the seventh lens is convex in the region near the optical axis.

11. The optical lens according to any one of claims 1-10, characterized in that, The effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy the following condition: 1.5≤|F7 / F|≤14.7577.

12. The optical lens according to any one of claims 1-10, characterized in that, The effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: 2≤|F7 / F|≤14.7577.

13. The optical lens according to any one of claims 1-10, characterized in that, The effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy the following condition: 1.5≤|F7 / F|≤6.3323.

14. The optical lens according to any one of claims 1-10, characterized in that, The distance TTL from the object side of the first lens to the imaging surface of the optical lens on the optical axis of the optical lens satisfies the following condition: 7.0352≤TTL / F≤9.

15. The optical lens according to any one of claims 1-10, characterized in that, The effective focal length F+ of the lens with positive optical power in the cemented lens and the effective focal length F- of the lens with negative optical power in the cemented lens satisfy: 0.8≤|F+ / F-|≤2.

5.

16. The optical lens according to any one of claims 1-10, characterized in that, The distance T67 between the sixth lens and the seventh lens on the optical axis of the optical lens and the distance TTL from the object side of the first lens to the imaging surface of the optical lens on the optical axis satisfy the following condition: 0.01≤T67 / TTL≤0.

1.

17. The optical lens according to any one of claims 1-10, characterized in that, The center thickness d3 of the second lens on the optical axis of the optical lens and the distance TTL from the object side of the first lens to the imaging surface of the optical lens on the optical axis satisfy: 0.1≤d3 / TTL≤0.

25.

18. The optical lens according to any one of claims 1-10, 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 the following condition: 57.714°≤(FOV×F) / H≤65°.

19. The optical lens according to any one of claims 1-10, characterized in that, The maximum field of view of the optical lens is defined by the following conditions: half-aperture D3 of the maximum aperture of the object side of the second lens corresponding to the maximum field of view of the optical lens; distance SAG3 from the intersection of the object side of the second lens and the optical axis of the optical lens to the maximum aperture of the object side of the second lens on the optical axis; half-aperture D4 of the maximum aperture of the image side of the second lens corresponding to the maximum field of view of the optical lens; and distance SAG4 from the intersection of the image side of the second lens and the optical axis to the maximum aperture of the image side of the second lens on the optical axis. The following condition is also met: 1.3277≤arctan(SAG3 / D3) / arctan(SAG4 / D4)≤2.

5.

20. The optical lens according to any one of claims 1-10, characterized in that, The distance TTL from the object side of the first lens to the imaging surface of the optical lens on the optical axis, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 3.726≤TTL / H / FOV×180°≤18.

21. The optical lens according to any one of claims 1-10, characterized in that, The distance TTL from the object side of the first lens to the imaging surface of the optical lens on the optical axis, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 3.726≤TTL / H / FOV×180°≤9.

22. The optical lens according to any one of claims 1-10, characterized in that, The maximum field of view (FOV) of the optical lens, the maximum aperture D of the object side of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: 1.71≤D / H / FOV×180°≤4.

5.

23. The optical lens according to any one of claims 1-10, characterized in that, The maximum field of view (FOV) of the optical lens, the maximum aperture D of the object side of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: 1.71≤D / H / FOV×180°≤3.

6.

24. The optical lens according to any one of claims 1-10, characterized in that, The refractive index Nd+ of the lens with positive optical power in the cemented lens and the Abbe number Vd+ of the lens with positive optical power in the cemented lens satisfy the following condition: 40≤Vd+ / Nd+≤54.6150.

25. The optical lens according to any one of claims 1-10, characterized in that, The refractive index Nd+ of the lens with positive optical power in the cemented lens and the Abbe number Vd+ of the lens with positive optical power in the cemented lens satisfy the following condition: 50≤Vd+ / Nd+≤54.6150.

26. The optical lens according to any one of claims 1-10, characterized in that, The optical lens satisfies at least one of the following conditions: 5.2403≤|F7 / F|≤14.7577, 1.9731mm≤|R3-R4-d3|≤4.8242mm, 7.0352≤TTL / F≤7.5656, 1.0053≤|F+ / F-|≤1.4919, 0.0103≤T67 / TTL≤0.05, 0.1273≤d3 / TTL≤0.1879, 57.714≤(FOV×F) / H≤62.7291, 1.3277≤arctan(SAG3 / D3) / arc tan(SAG4 / D4)≤2.2846, 3.726≤TTL / H / FOV×180°≤4.1760, 1.71≤D / H / FOV×180°≤1.926, 54.5056≤Vd+ / Nd+≤54.6150, where the effective focal length of the seventh lens is F7, the total effective focal length of the optical lens is F, the radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the image-side surface of the second lens is R4, the center thickness of the second lens on the optical axis of the optical lens is d3, and the distance from the object-side surface of the first lens to the image-side surface is... The distance between the imaging plane of the optical lens and the optical axis is TTL. The effective focal length of the lens with positive optical power in the cemented lens is F+, and the effective focal length of the lens with negative optical power in the cemented lens is F-. The distance between the sixth lens and the seventh lens on the optical axis is T67. The maximum field of view of the optical lens is FOV. The image height corresponding to the maximum field of view of the optical lens is H. The half-aperture of the maximum aperture of the object side of the second lens corresponding to the maximum field of view of the optical lens is D3. The distance from the intersection of the object side of the second lens and the optical axis of the optical lens to the optical axis is... The distance from the maximum aperture of the object side of the second lens on the optical axis is SAG3. The half-aperture of the maximum aperture of the image side of the second lens corresponding to the maximum field of view of the optical lens is D4. The distance from the intersection of the image side of the second lens and the optical axis to the maximum aperture of the image side of the second lens on the optical axis is SAG4. The maximum aperture of the object side of the first lens corresponding to the maximum field of view of the optical lens is D. The refractive index of the lens with positive optical power in the cemented lens is Nd+. The Abbe number of the lens with positive optical power in the cemented lens is Vd+.

27. An electronic device, characterized in that, It includes an optical lens according to any one of claims 1 to 26 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

Images