Optical lens and electronic equipment

Abstract

The invention provides an optical lens, and the optical lens comprises a first lens with negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the third lens has positive focal power, and the object side surface of the third lens is a convex surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has focal power; the sixth lens has focal power; a seventh lens with focal power; wherein one of the fifth lens and the sixth lens has positive focal power, the other one of the fifth lens and the sixth lens has negative focal power, and the fifth lens and the sixth lens are glued to form a glued lens. The problem that high resolution, miniaturization, small distortion, low cost and good temperature performance of an optical lens in the prior art are difficult to consider at the same time is solved.

Description

[0001] This application is a divisional application of the invention patent with application date of August 5, 2020, application number 2020107761333, and invention name “Optical lens and electronic device”. Technical Field

[0002] The present invention relates to the field of optical elements, and more specifically, to an optical lens and electronic equipment. Background Art

[0003] In recent years, with the rapid development of automobile assisted driving systems, vehicle-mounted lenses have become the eyes of automobiles to obtain external information, playing an irreplaceable role. In order to enable vehicle-mounted lenses to obtain information more accurately, optical lenses need to be equipped with larger and higher-resolution chips to improve the resolution quality of the lenses.

[0004] Usually, in order to meet the requirements of higher imaging quality in the market, more lens structures are often selected. However, this will lead to an increase in costs and will also seriously affect the miniaturization of the lens. For safety reasons, the vehicle-mounted lenses used in the field of autonomous driving have high requirements for stability and need to be able to cope with various harsh environments to avoid significant degradation of lens performance under different environments. In particular, traffic light recognition technology is one of the applications of vehicle-mounted lenses in urban road detection. In order to accurately identify signal lights of different colors, the lens itself needs to have good chromatic aberration. The optical lenses in the prior art have serious aberration problems such as chromatic aberration, astigmatism, and distortion, low resolution, poor realization of pattern details, and poor user experience. In addition, due to the need to improve image quality, the optical lens uses a large number of lenses. In order to meet the installation requirements of small spaces, when controlling the miniaturization of the optical lens, the optical lens back focus is short, which cannot meet the requirements of leaving enough focusing or installation space in the module assembly. In order to reduce costs and achieve lightweight effects, existing technologies often use plastic lenses for optical lenses. However, the thermal expansion and contraction characteristics of plastic lenses are difficult to overcome, resulting in the best image plane of the optical lens deviating from the chip at high and low temperatures of -40℃-120℃, causing adverse effects such as unclear images. At the same time, the high plasticization system has poor thermal stability, and after recovering from high temperature to normal temperature, the resolution cannot meet the requirements. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical lens and an electronic device to solve the problem in the prior art that the optical lens has high resolution, miniaturization, small distortion, low cost and good temperature performance.

[0006] To achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an optical lens, the optical lens having seven lenses with optical power, and the optical lens comprises: a first lens with negative optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; a second lens with negative optical power, the object side surface of the second lens is concave, and the image side surface of the second lens is convex; a third lens with positive optical power, the object side surface of the third lens is convex; a fourth lens with positive optical power, 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 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.

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

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

[0009] Furthermore, the fifth lens element has negative power, the object side surface of the fifth lens element is a concave surface, and the image side surface of the fifth lens element is a concave surface.

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

[0011] Furthermore, the fifth lens element has positive refractive power, the object side surface of the fifth lens element is a convex surface, and the image side surface of the fifth lens element is a convex surface.

[0012] Furthermore, the sixth lens has positive refractive power, the object-side surface of the sixth lens is a convex surface, and the image-side surface of the sixth lens is a convex surface.

[0013] Furthermore, the sixth lens has negative optical power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface.

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

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

[0016] Furthermore, the seventh lens has negative optical power, the object side surface of the seventh lens is concave in a region close to the optical axis of the optical lens, and the image side surface of the seventh lens is concave in a region close to the optical axis.

[0017] Furthermore, the seventh lens element has positive refractive power, and its object-side surface is convex in a region close to the optical axis, and its image-side surface is convex in a region close to the optical axis.

[0018] Furthermore, the effective focal length F7 of the seventh lens element 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 element 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 element and the total effective focal length F of the optical lens satisfy: 1.5≤|F7 / F|≤6.3323.

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

[0022] Furthermore, a distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis of the optical lens and a total effective focal length F of the optical lens satisfy: 7.0352≤TTL / F≤9;

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

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

[0025] Further, a center thickness d3 of the second lens on the optical axis of the optical lens and a distance TTL from the object side surface 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: 57.714°≤(FOV×F) / H≤65°.

[0027] Furthermore, the semi-aperture D3 of the maximum clear aperture of the object side surface of the second lens corresponding to the maximum field angle 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 clear aperture of the object side surface of the second lens on the optical axis, the semi-aperture D4 of the maximum clear aperture of the image side surface of the second lens corresponding to the maximum field angle 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 clear aperture of the image side surface of the second lens on the optical axis satisfy the following: 1.2685≤arctan(SAG3 / D3) / arctan(SAG4 / D4)≤2.5.

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

[0029] Furthermore, a distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis of the optical lens, an image height H corresponding to the maximum field of view of the optical lens, and a 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 clear 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 clear 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] Further, the refractive index Nd+ of the lens with positive power in the cemented lens and the Abbe number Vd+ of the lens with positive power in the cemented lens satisfy: 40≤Vd+ / Nd+≤66.1798.

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

[0034] Furthermore, the optical lens satisfies at least one of the following conditional expressions: 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, wherein 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 of the second lens is R3, the radius of curvature of the image side 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 from the object side of the first lens to the imaging surface of the optical lens on the optical axis is TTL, the effective focal length of the lens with positive focal power in the cemented lens is F+, the effective focal length of the lens with negative focal power in the cemented lens is F-, the spacing 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 semi-aperture of the maximum clear aperture of the object side of the second lens corresponding to the maximum field of view of the optical lens is D3, the object side of the second lens and the imaging surface of the optical lens are The distance from the intersection of the optical axes to the maximum clear aperture of the object side surface of the second lens on the optical axis is SAG3, the semi-aperture of the maximum clear aperture of the image side surface of the second lens corresponding to the maximum field of view angle of the optical lens is D4, the distance from the intersection of the image side surface of the second lens and the optical axis to the maximum clear aperture of the image side surface of the second lens on the optical axis is SAG4, the maximum clear aperture of the object side surface of the first lens corresponding to the maximum field of view angle of the optical lens is D, the refractive index of the lens with positive optical power in the cemented lens is Nd+, and the Abbe number of the lens with positive optical power in the cemented lens is Vd+.

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

[0036] In the seven-piece optical lens using the technical solution of the present invention, the first lens may have a negative optical focal length. The first lens may have a convex-concave surface. This optical focal length setting of the first lens can prevent excessive divergence of the object-side light, which is beneficial to controlling the aperture of the rear lens and realizing a miniaturized design. This surface setting of the first lens can collect as much light of a large field of view as possible, enter the rear optical system, and increase the amount of light passing through. The object side surface of the first lens is designed to be a convex surface, which is beneficial to the sliding of water droplets in actual use environments such as rainy and snowy weather, reducing the impact on imaging. Preferably, the first lens has a higher refractive index (such as Nd1≥1.7) and a higher hardness, which is beneficial to reducing the front port aperture and improving the imaging quality.

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

[0038] In an exemplary embodiment, the third lens may have positive optical power. The third lens may have a convex-convex surface type or a convex-concave surface type. Such optical power and surface type of the third lens are conducive to light convergence. The third lens is preferably made of a high refractive index material (Nd3≥1.65), which is conducive to reducing the front port diameter and improving the imaging quality. Preferably, the third lens has an aspherical mirror surface, which can improve the lens resolution.

[0039] In an exemplary embodiment, the fourth lens may have a positive optical power. The fourth lens may have a convex-convex surface. Such an optical power and surface configuration of the fourth lens is conducive to converging light and making the light smoothly transition to the rear optical system. By controlling the effective focal length of the fourth lens, the light trend from the first lens to the fourth lens can be controlled, making the system structure compact. Preferably, the fourth lens has an aspherical mirror surface, which can improve the lens resolution.

[0040] In an exemplary embodiment, the seventh lens may have positive power or negative 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 the resolution quality and correct aberrations.

[0041] As known to those skilled in the art, cemented lenses can be used to minimize or eliminate chromatic aberration. Using cemented lenses in optical lenses can improve image quality and reduce reflection loss of light energy, thereby achieving high resolution and improving the clarity of lens imaging. In addition, the use of cemented lenses can also simplify the assembly process during the lens manufacturing process.

[0042] In an exemplary embodiment, the fifth lens and the sixth lens are glued together to form a glued lens. The fifth lens and the sixth lens have opposite optical powers. For example, if the fifth lens has positive optical power, the sixth lens has negative optical power; or if the fifth lens has negative optical power, the sixth lens has positive optical power. The lens with positive optical power is preferably a lens of low refractive index and low dispersion material, which is beneficial to eliminate chromatic aberration. The fifth lens with a concave image side surface is glued with the sixth lens with a convex object side surface, or the fifth lens with a convex image side surface is glued with the sixth lens with a concave object side surface, which is beneficial to correct various aberrations of the optical system, and realize the improvement of system resolution, optimization of distortion and CRA and other optical performances under the premise of compact optical system structure. The above-mentioned gluing method between lenses has at least one of the following advantages: reducing the self-chromatic aberration, reducing the tolerance sensitivity, and balancing the overall chromatic aberration of the system through the residual partial chromatic aberration; reducing the spacing between the two lenses, thereby reducing the total length of the system; reducing the assembly components between the lenses, thereby reducing the process and reducing costs; reducing the tolerance sensitivity problems such as tilt / eccentricity caused by the lens unit during the assembly process, and improving the production yield; reducing the light loss caused by reflection between lenses, and improving the illumination; further reducing the field curvature, and effectively correcting the off-axis point aberration of the optical lens. Such a gluing design shares the overall chromatic aberration correction of the system, effectively corrects the aberration to improve the resolution, and makes the overall optical system compact to meet the requirements of miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0044] Figure 1 A schematic diagram showing the structure of an optical lens according to Embodiment 1 of the present application;

[0045] Figure 2 A schematic diagram showing the structure of an optical lens according to Embodiment 2 of the present application;

[0046] Figure 3 A schematic diagram showing the structure of an optical lens according to Embodiment 3 of the present application;

[0047] Figure 4 A schematic diagram showing the structure of an optical lens according to Embodiment 4 of the present application;

[0048] Figure 5 A schematic diagram showing the structure of an optical lens according to Embodiment 5 of the present application;

[0049] Figure 6 A schematic diagram showing the structure of an optical lens according to Embodiment 6 of the present application;

[0050] Figure 7 A schematic diagram showing the structure of an optical lens according to Embodiment 7 of the present application;

[0051] Figure 8 A schematic diagram showing the structure of an optical lens according to Embodiment 8 of the present application; and

[0052] Fig. 9 Schematic diagram showing the sagittal height of the object side surface of the lens according to the present application.

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

[0054] STO, aperture; 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 DESCRIPTION

[0055] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0056] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0057] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0058] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0059] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0060] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging side is called the image side of the lens.

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

[0062] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0063] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

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

[0065] In an exemplary embodiment, the optical lens includes, for example, seven lenses having optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are arranged in sequence from the object side to the image side along the optical axis.

[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 charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0067] In order to solve the problem in the prior art that it is difficult to achieve high resolution, miniaturization, small distortion, low cost and good temperature performance of an optical lens, the present 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, and the optical lens includes: a first lens with negative optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; a second lens with negative optical power, the object side surface of the second lens is concave, and the image side surface of the second lens is convex; a third lens with positive optical power, the object side surface of the third lens is convex; a fourth lens with positive optical power, 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 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.

[0069] In the seven-piece optical lens of the present 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 the object-side light from being too divergent, which is beneficial to controlling the aperture of the rear lens and realizing a miniaturized design. This surface setting of the first lens can collect a large field of view light as much as possible, enter the rear optical system, and increase the amount of light passing through. The object side of the first lens is designed to be convex, which is beneficial to the sliding of water droplets in actual use environments such as rainy and snowy weather, reducing the impact on imaging. Preferably, the first lens has a higher refractive index (such as Nd1≥1.7) and a higher hardness, which is beneficial to reducing the front port aperture and improving the imaging quality.

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

[0071] In an exemplary embodiment, the third lens may have positive optical power. The third lens may have a convex-convex surface type or a convex-concave surface type. Such optical power and surface type of the third lens are conducive to light convergence. The third lens is preferably made of a high refractive index material (Nd3≥1.65), which is conducive to reducing the front port diameter and improving the imaging quality. Preferably, the third lens has an aspherical mirror surface, which can improve the lens resolution.

[0072] In an exemplary embodiment, the fourth lens may have a positive optical power. The fourth lens may have a convex-convex surface. Such an optical power and surface configuration of the fourth lens is conducive to converging light and making the light smoothly transition to the rear optical system. By controlling the effective focal length of the fourth lens, the light trend from the first lens to the fourth lens can be controlled, making the system structure compact. Preferably, the fourth lens has an aspherical mirror surface, which can improve the lens resolution.

[0073] In an exemplary embodiment, the seventh lens may have positive power or negative 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 the resolution quality and correct aberrations.

[0074] As known to those skilled in the art, cemented lenses can be used to minimize or eliminate chromatic aberration. Using cemented lenses in optical lenses can improve image quality and reduce reflection loss of light energy, thereby achieving high resolution and improving the clarity of lens imaging. In addition, the use of cemented lenses can also simplify the assembly process during the lens manufacturing process.

[0075] In an exemplary embodiment, the fifth lens and the sixth lens are glued together to form a glued lens. The fifth lens and the sixth lens have opposite optical powers. For example, if the fifth lens has positive optical power, the sixth lens has negative optical power; or if the fifth lens has negative optical power, the sixth lens has positive optical power. The lens with positive optical power is preferably a lens of low refractive index and low dispersion material, which is beneficial to eliminate chromatic aberration. The fifth lens with a concave image side surface is glued with the sixth lens with a convex object side surface, or the fifth lens with a convex image side surface is glued with the sixth lens with a concave object side surface, which is beneficial to correct various aberrations of the optical system, and realize the improvement of system resolution, optimization of distortion and CRA and other optical performances under the premise of compact optical system structure. The above-mentioned gluing method between lenses has at least one of the following advantages: reducing the self-chromatic aberration, reducing the tolerance sensitivity, and balancing the overall chromatic aberration of the system through the residual partial chromatic aberration; reducing the spacing between the two lenses, thereby reducing the total length of the system; reducing the assembly components between the lenses, thereby reducing the process and reducing costs; reducing the tolerance sensitivity problems such as tilt / eccentricity caused by the lens unit during the assembly process, and improving the production yield; reducing the light loss caused by reflection between lenses, and improving the illumination; further reducing the field curvature, and effectively correcting the off-axis point aberration of the optical lens. Such a gluing design shares the overall chromatic aberration correction of the system, effectively corrects the aberration to improve the resolution, and makes the overall optical system compact to meet the requirements of miniaturization.

[0076] In an exemplary embodiment, at least two lenses among the second lens, the third lens, the fourth lens, and the seventh lens may have an aspherical mirror surface, which may 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, 2≤|F7 / F|≤14.7577, further, 1.5≤|F7 / F|≤6.3323. Further, 2.0884≤|F7 / F|≤14.7577, which helps to correct the chromatic aberration of 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: 1.8 mm ≤ |R3-R4-d3| ≤ 4.8242 mm. Further, 1.9731 mm ≤ |R3-R4-d3| ≤ 4.8242 mm. Satisfying 1.8 mm ≤ |R3-R4-d3| ≤ 4.8242 mm helps to smoothly transition the light 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 and the total effective focal length F of the optical lens satisfy: 7.0352≤TTL / F≤9, and further, 7.0352≤TTL / F≤7.9113. Satisfying 7.0352≤TTL / F≤9 is conducive to miniaturization.

[0080] In an exemplary embodiment, the effective focal length F+ of the lens with positive power in the cemented lens and the effective focal length F- of the lens with negative 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 makes the focal length values ​​of the lenses in the cemented part similar, which helps to smoothly transition the light and correct chromatic aberration.

[0081] In an exemplary embodiment, the interval 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: 0.01≤T67 / TTL≤0.1. Further, 0.0103≤T67 / TTL≤0.05. Satisfying 0.01≤T67 / TTL≤0.1 is helpful for assembling the optical lens and improving ghost images.

[0082] In an exemplary embodiment, 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. Further, 0.1273≤d3 / TTL≤0.1879. Satisfying 0.1≤d3 / TTL≤0.25 helps 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: 57.714°≤(FOV×F) / H≤65°. Further, 57.714≤(FOV×F) / H≤62.7291. Satisfying 57.714°≤(FOV×F) / H≤65° is conducive to the optical lens having less distortion and can match a larger chip.

[0084] In an exemplary embodiment, the semi-aperture D3 of the maximum clear aperture of the object side surface of the second lens corresponding to the maximum field angle 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 clear aperture of the object side surface of the second lens on the optical axis, the semi-aperture D4 of the maximum clear aperture of the image side surface of the second lens corresponding to the maximum field angle 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 clear aperture of the image side surface of the second lens on the optical axis 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 conducive to a smooth transition of peripheral light and to reducing the sensitivity of the lens.

[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 of the optical lens, 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. Further, 3.726≤TTL / H / FOV×180°≤9. Further, 3.726≤TTL / H / FOV×180°≤4.446. Satisfying 3.726≤TTL / H / FOV×180°≤18 is conducive to miniaturization, and can make the optical lens smaller in size under the same imaging surface and the same image height.

[0086] In an exemplary embodiment, the maximum field of view FOV of the optical lens, the maximum clear 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. Further, 1.71≤D / H / FOV×180°≤3.6. Further, 1.71≤D / H / FOV×180°≤1.926. Satisfying 1.71≤D / H / FOV×180°≤3.6 is conducive to a smaller front port diameter.

[0087] In an exemplary embodiment, the refractive index Nd+ of the lens with positive power in the cemented lens and the Abbe number Vd+ of the lens with positive power in the cemented lens satisfy: 40≤Vd+ / Nd+≤66.1798. Further, 50≤Vd+ / Nd+≤66.1798. Further, 54.5056≤Vd+ / Nd+≤66.1798. Satisfying 40≤Vd+ / Nd+≤66.1798 makes the lens with positive power in the cemented piece preferably made of ultra-low refractive index and ultra-low dispersion materials, which is beneficial to correcting chromatic aberration.

[0088] In an exemplary embodiment, a stop for limiting the light beam may be provided between the third lens and the fourth lens to further improve the imaging quality of the optical lens. Setting the stop between the third lens and the fourth lens is conducive to increasing the stop aperture, effectively converging the light entering the optical lens, and reducing the lens aperture. In an embodiment of the present application, the stop may be provided near the image side surface of the third lens, or near the object side surface of the fourth lens. However, it should be noted that the position of the stop disclosed herein is only an example and not a limitation; in alternative embodiments, the stop may also be provided at other positions according to actual needs.

[0089] In an exemplary embodiment, as needed, the optical lens according to the present application may further include a filter disposed between the seventh lens and the imaging plane to filter light with different wavelengths. The optical lens according to the present application may further include a protective glass disposed between the seventh lens and the imaging plane to prevent the image-side element (e.g., chip) of the optical lens from being damaged.

[0090] In an exemplary embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens may all have an aspherical mirror surface. The characteristic of the aspherical lens is that the curvature changes continuously from the center of the lens to the periphery. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery, the aspherical lens has a better curvature radius characteristic and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting the aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens. The setting of the aspherical lens helps to correct the system aberration and improve the resolution. Specifically, at least one lens among the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is an aspherical lens, which is beneficial to improving the resolution quality of the optical system.

[0091] According to the optical lens of the above-mentioned embodiment of the present application, by reasonably setting the shape and focal length of each lens, the optical system can achieve at least one beneficial effect of small chromatic aberration, high resolution (up to more than 8 million pixels), miniaturization, small distortion, small front port diameter, small ghost image and good imaging quality when only 7 lenses are used. At the same time, the optical system also takes into account the low-cost requirements of small lens volume, low sensitivity and high production yield. The optical lens also has a long focal length, and the central area has a large angular resolution, which can improve the recognition of environmental objects and specifically increase the detection area of ​​the central part. At the same time, the optical lens has good temperature adaptability, small changes in imaging effects under high and low temperature environments, and stable image quality.

[0092] According to the optical lens of the above-mentioned embodiment of the present application, a cemented lens is provided to share the overall chromatic aberration correction of the system, which is beneficial for correcting the system aberration, improving the system resolution quality, reducing the coordination sensitivity problem, and making the overall structure of the optical system compact to meet the miniaturization requirements.

[0093] In an exemplary embodiment, the first to seventh lenses in the optical lens may all be made of glass. An optical lens made of glass can suppress the deviation of the back focus of the optical lens with temperature changes to improve system stability. At the same time, the use of glass material can avoid lens imaging blur caused by high and low temperature changes in the use environment, which affects the normal use of the lens. Specifically, when focusing on resolution quality and reliability, the first to seventh lenses may all be glass aspherical lenses. Of course, in applications where temperature stability requirements are lower, the first to seventh lenses in the optical lens may also all be made of plastic. Using plastic to make optical lenses can effectively reduce production costs.

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

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

[0096] Example 1

[0097] The following reference Figure 1 An optical lens according to Example 1 of the present application is described. Figure 1 A schematic structural diagram of an optical lens according to Example 1 of the present application is shown.

[0098] like Figure 1As shown, the optical lens includes 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 in sequence from the object side to the image side along the optical axis.

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

[0100] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed close to the image side surface S6 of the third lens L3.

[0101] Optionally, the optical lens may further include a filter L8 having an object side surface S15 and an image side surface S16, and the filter L8 may be used to correct color deviation. The optical lens may further include a protective glass L9 having an object side surface S17 and an image side surface S18, and the protective glass L9 may be used to protect the image sensor chip IMA located at the imaging surface S19. The light from the object passes through each surface S1 to S18 in sequence 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 of the row where S1 is located is the center thickness d1 of the first lens L1, the thickness d / distance T of the row where S2 is located is the spacing 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 Example 1.

[0103]

[0104]

[0105] Table 1

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

[0107]

[0108] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspheric mirror surface 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 reference Figure 2 An optical lens according to Embodiment 2 of the present application is described. Figure 2 A schematic structural diagram of an optical lens according to Example 2 of the present application is shown.

[0113] like Figure 2 As shown, the optical lens includes 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 in sequence from the object side to the image side along the optical axis.

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

[0115] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed close to the image side surface S6 of the third lens L3.

[0116] Optionally, the optical lens may further include a filter L8 having an object side surface S15 and an image side surface S16, and the filter L8 may be used to correct color deviation. The optical lens may further include a protective glass L9 having an object side surface S17 and an image side surface S18, and the protective glass L9 may be used to protect the image sensor chip IMA located at the imaging surface S19. The light from the object passes through each surface S1 to S18 in sequence 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 of the optical lens of Example 2. Table 4 shows the conic coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 2, wherein each aspheric surface shape can be defined by formula (1) given in the above-mentioned Example 1.

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

[0125] like Figure 3 As shown, the optical lens includes 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 in sequence from the object side to the image side along the optical axis.

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

[0127] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed close to the image side surface S6 of the third lens L3.

[0128] Optionally, the optical lens may further include a filter L8 having an object side surface S15 and an image side surface S16, and the filter L8 may be used to correct color deviation. The optical lens may further include a protective glass L9 having an object side surface S17 and an image side surface S18, and the protective glass L9 may be used to protect the image sensor chip IMA located at the imaging surface S19. The light from the object passes through each surface S1 to S18 in sequence 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 of the optical lens of Example 3. Table 6 shows the cone coefficient and high-order coefficient that can be used for each aspherical mirror surface in Example 3, wherein each aspherical surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

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

[0136] like Figure 4 As shown, the optical lens includes 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 in sequence from the object side to the image side along the optical axis.

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

[0138] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed close to the image side surface S6 of the third lens L3.

[0139] Optionally, the optical lens may further include a filter L8 having an object side surface S15 and an image side surface S16, and the filter L8 may be used to correct color deviation. The optical lens may further include a protective glass L9 having an object side surface S17 and an image side surface S18, and the protective glass L9 may be used to protect the image sensor chip IMA located at the imaging surface S19. The light from the object passes through each surface S1 to S18 in sequence 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 of the optical lens of Example 4. Table 8 shows the cone coefficient and high-order coefficient that can be used for each aspherical mirror surface in Example 4, wherein each aspherical surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

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

[0148] like Figure 5 As shown, the optical lens includes 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 in sequence from the object side to the image side along the optical axis.

[0149] The first lens L1 is a convex-concave lens with negative focal power, whose object side surface S1 is convex, and whose image side surface S2 is concave. The second lens L2 is a convex-concave lens with negative focal power, whose object side surface S3 is concave, and whose image side surface S4 is convex. The third lens L3 is a biconvex lens with positive focal power, whose object side surface S5 is convex, and whose image side surface S6 is convex. The fourth lens L4 is a biconvex lens with positive focal power, whose object side surface S8 is convex, and whose image side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative focal power, whose object side surface S10 is convex, and whose image side surface S11 is concave. The sixth lens L6 is a biconvex lens with positive focal power, whose object side surface S11 is convex, and whose image side surface S12 is convex. The seventh lens L7 has negative 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 to form a cemented lens.

[0150] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed close to the image side surface S6 of the third lens L3.

[0151] Optionally, the optical lens may further include a filter L8 having an object side surface S15 and an image side surface S16, and the filter L8 may be used to correct color deviation. The optical lens may further include a protective glass L9 having an object side surface S17 and an image side surface S18, and the protective glass L9 may be used to protect the image sensor chip IMA located at the imaging surface S19. The light from the object passes through each surface S1 to S18 in sequence 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 of the optical lens of Example 5. Table 10 shows the conic coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 5, wherein each aspheric surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

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

[0160] like Figure 6 As shown, the optical lens includes 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 in sequence from the object side to the image side along the optical axis.

[0161] The first lens L1 is a convex-concave lens with negative focal power, whose object side surface S1 is convex, and whose image side surface S2 is concave. The second lens L2 is a convex-concave lens with negative focal power, whose object side surface S3 is concave, and whose image side surface S4 is convex. The third lens L3 is a biconvex lens with positive focal power, whose object side surface S5 is convex, and whose image side surface S6 is convex. The fourth lens L4 is a biconvex lens with positive focal power, whose object side surface S8 is convex, and whose image side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative focal power, whose object side surface S10 is convex, and whose image side surface S11 is concave. The sixth lens L6 is a biconvex lens with positive focal power, whose object side surface S11 is convex, and whose image side surface S12 is convex. The seventh lens L7 has negative 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 to form a cemented lens.

[0162] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed close to the image side surface S6 of the third lens L3.

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

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

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

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

[0172] like Figure 7 As shown, the optical lens includes 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 in sequence from the object side to the image side along the optical axis.

[0173] The first lens L1 is a convex-concave lens with negative focal power, whose object side surface S1 is convex, and whose image side surface S2 is concave. The second lens L2 is a convex-concave lens with negative focal power, whose object side surface S3 is concave, and whose image side surface S4 is convex. The third lens L3 is a convex-concave lens with positive focal power, whose object side surface S5 is convex, and whose image side surface S6 is concave. The fourth lens L4 is a biconvex lens with positive focal power, whose object side surface S8 is convex, and whose image side surface S9 is convex. The fifth lens L5 is a biconvex lens with positive focal power, whose object side surface S10 is convex, and whose image side surface S11 is convex. The sixth lens L6 is a biconcave lens with negative focal power, whose object side surface S11 is concave, and whose image side surface S12 is concave. The seventh lens L7 has positive refractive 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 to form a cemented lens.

[0174] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed close to the object-side surface S8 of the fourth lens L4.

[0175] Optionally, the optical lens may further include a filter L8 having an object side surface S15 and an image side surface S16, and the filter L8 may be used to correct color deviation. The optical lens may further include a protective glass L9 having an object side surface S17 and an image side surface S18, and the protective glass L9 may be used to protect the image sensor chip IMA located at the imaging surface S19. The light from the object passes through each surface S1 to S18 in sequence 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 of the optical lens of Example 7. Table 14 shows the cone coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 7, wherein each aspheric surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

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

[0184] like Figure 8 As shown, the optical lens includes 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 in sequence from the object side to the image side along the optical axis.

[0185] The first lens L1 is a convex-concave lens with negative focal power, whose object side surface S1 is convex, and whose image side surface S2 is concave. The second lens L2 is a convex-concave lens with negative focal power, whose object side surface S3 is concave, and whose image side surface S4 is convex. The third lens L3 is a convex-concave lens with positive focal power, whose object side surface S5 is convex, and whose image side surface S6 is concave. The fourth lens L4 is a biconvex lens with positive focal power, whose object side surface S8 is convex, and whose image side surface S9 is convex. The fifth lens L5 is a biconvex lens with positive focal power, whose object side surface S10 is convex, and whose image side surface S11 is convex. The sixth lens L6 is a biconcave lens with negative focal power, whose object side surface S11 is concave, and whose image side surface S12 is concave. The seventh lens L7 has positive refractive 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 to form a cemented lens.

[0186] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed close to the object-side surface S8 of the fourth lens L4.

[0187] Optionally, the optical lens may further include a filter L8 having an object side surface S15 and an image side surface S16, and the filter L8 may be used to correct color deviation. The optical lens may further include a protective glass L9 having an object side surface S17 and an image side surface S18, and the protective glass L9 may be used to protect the image sensor chip IMA located at the imaging surface S19. The light from the object passes through each surface S1 to S18 in sequence 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 of the optical lens of Example 8. Table 16 shows the cone coefficient and high-order coefficient that can be used for each aspheric mirror surface in Example 8, wherein each aspheric surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0189]

[0190] Table 15

[0191]

[0192]

[0193] Table 16

[0194] In summary, Examples 1 to 8 respectively satisfy the relationships shown in Table 17-1 and Table 17-2 below. In Table 17-1 and Table 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] The present application also provides an electronic device, which may include an optical lens according to the above-mentioned embodiment of the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal. The electronic device may be an independent electronic device such as a detection distance camera, or an imaging module integrated in a device such as a detection distance device. In addition, the electronic device may also be an independent imaging device such as a vehicle-mounted camera, or an imaging module integrated in a driving assistance system such as a vehicle-mounted camera.

[0202] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present 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 having negative optical power, wherein the object side surface of the first lens is convex, and the image side surface of the first lens is concave; a second lens having negative optical power, wherein the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; a third lens having positive refractive power, wherein the object side surface of the third lens is a convex surface; a fourth lens having positive refractive 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 having optical power; a sixth lens having optical power; a seventh lens having optical power; One of the fifth lens and the sixth lens has positive power, the other of the fifth lens and the sixth lens has negative power, and the fifth lens and the sixth lens are cemented to form a cemented lens.

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

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

4. The optical lens according to claim 1, characterized in that: The fifth lens has negative optical power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface.

5. The optical lens according to claim 1, characterized in that: The fifth lens has negative optical power, 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 fifth lens has positive refractive power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface.

7. The optical lens according to claim 1, characterized in that: The sixth lens has positive refractive power, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface.

8. The optical lens according to claim 1, characterized in that: The sixth lens has negative optical power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface.

9. The optical lens according to claim 1, characterized in that: The seventh lens has positive refractive power, the object side surface of the seventh lens is convex in a region close to the optical axis of the optical lens, and the image side surface of the seventh lens is concave in a region close to the optical axis.

10. An electronic device, characterized in that: The invention comprises an optical lens according to any one of claims 1 to 9 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

Images