Optical lens and electronic device

Abstract

The application discloses an optical lens and an electronic device comprising the same. The optical lens comprises in sequence: a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens; a fifth lens having positive refractive power; a sixth lens having negative refractive power; and a seventh lens having positive refractive power. The radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy: 0.512≤|R3 / R4|≤0.7735; the radius of curvature R13 of the object side of the seventh lens and the radius of curvature R14 of the image side of the seventh lens satisfy: 0.4207≤|R13 / R14|≤5.7963; and the radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy: 0.02≤(R3‑R4) / (R3+R4)≤0.4. The optical lens can achieve at least one of the beneficial effects of high resolution, low cost, miniaturization, small caliber, small CRA, good temperature performance and the like.

Description

[0001] This application is a divisional application of the invention patent application No. 2019112117752, with the title of "Optical Lens and Electronic Device", filed on December 2, 2019. TECHNICAL FIELD

[0002] The present application relates to the field of optical elements, and more particularly, to an optical lens and an electronic device. BACKGROUND

[0003] As an important imaging optical element, optical lenses have important applications in many fields. For example, in recent years, with the rapid development of automobile auxiliary driving systems, the application of optical lenses on automobiles has become more and more widespread. The image information collected by the optical lens can be used as important decision-making data for the automobile auxiliary driving system (even for the automatic driving system). In view of safe driving, the performance requirements of the optical lens applied to the automobile auxiliary driving system or the automobile automatic driving system are also getting higher and higher. Under this background, the importance of the imaging quality, miniaturization degree or temperature stability of the optical lens is also getting higher and higher. SUMMARY

[0004] One aspect of the present application provides an optical lens, which comprises, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, the first lens has a negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface; the second lens has a negative focal power, the object side surface is a concave surface, and the image side surface is a convex surface; the third lens has a positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface; the fourth lens has a focal power; the fifth lens has a positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface; the sixth lens has a negative focal power, the object side surface is a concave surface, and the image side surface is a convex surface; and the seventh lens has a positive focal power.

[0005] In one embodiment, the object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface.

[0006] In one embodiment, the object side surface of the fourth lens is a convex surface, and the image side surface is a concave surface.

[0007] In one embodiment, the object side surface of the fourth lens is a concave surface, and the image side surface is a concave surface.

[0008] In one embodiment, the object side surface of the seventh lens is a convex surface, and the image side surface is a concave surface.

[0009] In one embodiment, the object side surface of the seventh lens is a concave surface, and the image side surface is a convex surface.

[0010] In an embodiment, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is convex.

[0011] In an embodiment, the fifth lens and the sixth lens are cemented together to form a cemented lens.

[0012] In an embodiment, the first lens is an aspherical lens.

[0013] In an embodiment, the fourth lens and the seventh lens are aspherical lenses.

[0014] In an embodiment, a radius of curvature R3 of the object side surface of the second lens and a radius of curvature R4 of the image side surface of the second lens satisfy: |R3 / R4|≤15.

[0015] In an embodiment, a distance TTL from the object side surface of the first lens to an imaging surface of the optical lens on the optical axis and a total effective focal length F of the optical lens satisfy: TTL / F≤9.

[0016] In an embodiment, a distance TTL from the object side surface of the first lens to an imaging surface of the optical lens on the optical axis, a maximum field of view FOV of the optical lens, and an image height H corresponding to the maximum field of view FOV satisfy: TTL / H / FOV≤0.06.

[0017] In an embodiment, a maximum field of view FOV of the optical lens, a maximum entrance pupil D of the object side surface of the first lens corresponding to the maximum field of view FOV, and an image height H corresponding to the maximum field of view FOV satisfy: D / H / FOV≤0.025.

[0018] In an embodiment, an effective focal length F5 of the fifth lens and an effective focal length F6 of the sixth lens satisfy: 0.1≤|F5 / F6|≤1.6.

[0019] In an embodiment, a maximum value p of a ratio of the center thickness of any two lenses of the first lens to the seventh lens on the optical axis satisfies: 2≤p≤8.

[0020] In an embodiment, a radius of curvature R13 of the object side surface of the seventh lens and a radius of curvature R14 of the image side surface of the seventh lens satisfy: |R13 / R14|≤15.

[0021] In an embodiment, a combined focal length F56 of the fifth lens and the sixth lens and a total effective focal length F of the optical lens satisfy: 3≤|F56 / F|≤10.

[0022] In one embodiment, a maximum field angle FOV of the optical lens, a total effective focal length F of the optical lens, and an image height H corresponding to the maximum field angle FOV satisfy: (FOVxF) / H≥50.

[0023] In one embodiment, a radius of curvature R3 of an object side surface of the second lens and a radius of curvature R4 of an image side surface of the second lens satisfy: 0.02≤(R3-R4) / (R3+R4)≤0.4.

[0024] In one embodiment, a total effective focal length F of the optical lens and a radius of curvature R1 of an object side surface of the first lens satisfy: |F / R1|≤1.5.

[0025] In one embodiment, a radius of curvature R1 of an object side surface of the first lens and a radius of curvature R2 of an image side surface of the first lens satisfy: R1 / R2≤30.

[0026] In one embodiment, a total effective focal length F of the optical lens and an image height H corresponding to a maximum field angle of the optical lens satisfy: F / H≤3.

[0027] Another aspect of the present application provides an optical lens, which comprises, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, the first lens having a negative focal power; the second lens having a negative focal power; the third lens having a positive focal power; the fourth lens having a focal power; the fifth lens having a positive focal power; the sixth lens having a negative focal power; and the seventh lens having a positive focal power; wherein a radius of curvature R1 of an object side surface of the first lens and a radius of curvature R2 of an image side surface of the first lens satisfy: R1 / R2≤30.

[0028] In one embodiment, an object side surface of the first lens is convex, and an image side surface of the first lens is concave.

[0029] In one embodiment, an object side surface of the second lens is concave, and an image side surface of the second lens is convex.

[0030] In one embodiment, an object side surface of the third lens is convex, and an image side surface of the third lens is convex.

[0031] In one embodiment, an object side surface of the fourth lens is concave, and an image side surface of the fourth lens is convex.

[0032] In one embodiment, an object side surface of the fourth lens is convex, and an image side surface of the fourth lens is concave.

[0033] In one embodiment, an object side surface of the fourth lens is concave, and an image side surface of the fourth lens is concave.

[0034] In an embodiment, the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is convex.

[0035] In an embodiment, the object side surface of the sixth lens is concave, and the image side surface of the sixth lens is convex.

[0036] In an embodiment, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave.

[0037] In an embodiment, the object side surface of the seventh lens is concave, and the image side surface of the seventh lens is convex.

[0038] In an embodiment, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is convex.

[0039] In an embodiment, the fifth lens and the sixth lens are cemented to form a cemented lens.

[0040] In an embodiment, the first lens is an aspherical lens.

[0041] In an embodiment, the fourth lens and the seventh lens are aspherical lenses.

[0042] In an embodiment, a radius of curvature R3 of the object side surface of the second lens and a radius of curvature R4 of the image side surface of the second lens satisfy: |R3 / R4|≤15.

[0043] In an embodiment, a distance TTL of the object side surface of the first lens to an imaging surface of the optical lens on the optical axis and a total effective focal length F of the optical lens satisfy: TTL / F≤9.

[0044] In an embodiment, a distance TTL of the object side surface of the first lens to an imaging surface of the optical lens on the optical axis, a maximum field of view FOV of the optical lens, and an image height H corresponding to the maximum field of view FOV satisfy: TTL / H / FOV≤0.06.

[0045] In an embodiment, a maximum field of view FOV of the optical lens, a maximum entrance pupil D of the object side surface of the first lens corresponding to the maximum field of view FOV, and an image height H corresponding to the maximum field of view FOV satisfy: D / H / FOV≤0.025.

[0046] In an embodiment, an effective focal length F5 of the fifth lens and an effective focal length F6 of the sixth lens satisfy: 0.1≤|F5 / F6|≤1.6.

[0047] In an embodiment, a maximum value p of a ratio of central thicknesses of any two lenses among the first lens to the seventh lens on the optical axis satisfies: 2≤p≤8.

[0048] In an embodiment, a radius of curvature R13 of an object side surface of the seventh lens and a radius of curvature R14 of an image side surface of the seventh lens satisfy: |R13 / R14|≤15.

[0049] In an embodiment, a combined focal length F56 of the fifth lens and the sixth lens and a total effective focal length F of the optical lens satisfy: 3≤|F56 / F|≤10.

[0050] In an embodiment, a maximum field of view FOV of the optical lens, a total effective focal length F of the optical lens, and an image height H corresponding to the maximum field of view FOV satisfy: (FOVxF) / H≥50.

[0051] In an embodiment, a radius of curvature R3 of an object side surface of the second lens and a radius of curvature R4 of an image side surface of the second lens satisfy: 0.02≤(R3-R4) / (R3+R4)≤0.4.

[0052] In an embodiment, a total effective focal length F of the optical lens and a radius of curvature R1 of an object side surface of the first lens satisfy: |F / R1|≤1.5.

[0053] In an embodiment, a total effective focal length F of the optical lens and an image height H corresponding to a maximum field of view of the optical lens satisfy: F / H≤3.

[0054] The present application adopts seven lenses, and by optimizing the shape, optical power, etc. of each lens, the optical lens has at least one of the following beneficial effects: high resolution, low cost, miniaturization, small aperture, small CRA, good temperature performance, etc.

[0055] According to the technical scheme, the optical lens has seven lenses with optical power, and sequentially comprises, from the object side to the image side along the optical axis of the optical lens: a first lens with negative optical 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; a second lens with negative optical power, 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 with positive optical power, the object side surface of the third lens is a convex surface; a fourth lens; a fifth lens with positive optical 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; a sixth lens with negative optical power, the object side surface of the sixth lens is a concave surface; and a seventh lens with positive optical power, wherein the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy 0.512≤|R3 / R4|≤0.7735, the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens satisfy 0.4207≤|R13 / R14|≤5.7963, and the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy 0.02≤(R3-R4) / (R3+R4)≤0.4.

[0056] By setting the first lens to have negative focal power and a meniscus shape, the object side surface of the first lens can be convex, and the image side surface of the first lens can be concave, which is conducive to collecting incident light rays of a large field angle, so that more light rays enter the rear optical system smoothly, thereby increasing the light flux and improving the imaging quality of the optical system. In actual applications, vehicle-mounted lenses are generally exposed to external environments. Such a convex object-side meniscus lens is conducive to the sliding of rain and snow along the lens, prolongs the service life of the lens, and reduces the adverse effects of rain and snow on the imaging of the lens. The second lens can have negative focal power, and the object side surface of the second lens can be concave, while the image side surface of the second lens is convex. Such a focal power and surface configuration of the second lens is conducive to the smooth entry of light rays into the rear optical system, improving the resolving power of the optical system, and conducive to collecting more incident light rays of a large field angle to enter the rear optical system, thereby increasing the light flux. The third lens can have positive focal power, and the object side surface and the image side surface of the third lens can be convex. When the third lens has positive focal power, it is conducive to converging light rays, reducing the aperture and the length of the optical barrel, and realizing miniaturization of the lens. The fourth lens can have positive focal power or negative focal power, and the object side surface of the fourth lens can be concave, while the image side surface of the fourth lens can be convex, or the object side surface of the fourth lens can be convex, while the image side surface of the fourth lens can be concave, or the object side surface and the image side surface of the fourth lens can be concave. The fourth lens is arranged in the optical system, which is conducive to correcting aberrations generated by the front lens group, converging the light beam, increasing the aperture of the lens, and making the optical system structure more compact, thereby shortening the total length of the lens and making the optical system have a relatively short overall length. The fifth lens can have positive focal power, and the object side surface and the image side surface of the fifth lens can be convex. The sixth lens can have negative focal power, and the object side surface of the sixth lens can be concave, while the image side surface of the sixth lens can be convex. The seventh lens can have positive focal power, and the object side surface of the seventh lens can be convex, while the image side surface of the seventh lens can be concave, or the object side surface of the seventh lens can be concave, while the image side surface of the seventh lens can be convex, or the object side surface and the image side surface of the seventh lens can be convex. Such a focal power and surface configuration of the seventh lens is conducive to making the front light ray trend gentle and reducing the CRA, thereby improving the resolving power of the system.

[0057] By limiting 0.512≤|R3 / R4|≤0.7735, the ratio of the curvature radius of the object side of the second lens to the curvature radius of the image side of the second lens is reasonably set, so that the curvature radius of the object side and the curvature radius of the image side are similar or the object side is more curved than the image side, which is beneficial to correct the optical system aberration and improve the image quality. By limiting 0.4207≤|R13 / R14|≤5.7963, the ratio of the curvature radius of the object side of the seventh lens to the curvature radius of the image side of the seventh lens is reasonably set, so that the curvature radius of the object side and the curvature radius of the image side are similar, which is beneficial to the light entering the optical system gently and improving the system resolution quality. By limiting 0.02≤(R3-R4) / (R3+R4)≤0.4, the curvature radius of the object side of the second lens and the curvature radius of the image side of the second lens satisfy the above relationship, which is beneficial to correct the optical system aberration, so that when the light emitted from the second lens enters the object side of the third lens, the incidence angle of the light is not too large, thereby reducing the tolerance sensitivity of the optical system. If the numerical limit of the above condition formula exceeds the upper limit value, the aberration of the optical system may not be fully corrected; if the numerical limit of the above condition formula is lower than the lower limit value, the incidence angle of the light emitted from the first lens to the object side of the second lens may be too large, which will increase the sensitivity of the optical system. BRIEF DESCRIPTION OF DRAWINGS

[0058] Other features, objects, and advantages of the application will become more apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings:

[0059] Figure 1 To show the structure schematic diagram of the optical lens according to Embodiment 1 of the application;

[0060] Figure 2 To show the structure schematic diagram of the optical lens according to Embodiment 2 of the application;

[0061] Figure 3 To show the structure schematic diagram of the optical lens according to Embodiment 3 of the application;

[0062] Figure 4 To show the structure schematic diagram of the optical lens according to Embodiment 4 of the application; and

[0063] Figure 5 To show the structure schematic diagram of the optical lens according to Embodiment 5 of the application.

[0064] In the above drawings, the following reference signs are used:

[0065] STO, 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; S6, object side surface of the third lens; S7, 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; S17 (IMA), imaging surface. DETAILED DESCRIPTION

[0066] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be noted that these detailed description are merely descriptive of illustrative embodiments of the present application, and are not intended in any way to limit the scope of the present application. Throughout the specification, like reference numerals will refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0067] It is to be noted that, in the present specification, the expressions first, second, third and the like are used merely to distinguish one feature from another feature, and do not indicate any limitation of the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0068] In the drawings, the thickness, size, and shape of the lenses have been exaggerated slightly for the sake of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0069] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the imaging side is referred to as the image side surface of the lens.

[0070] It should also be understood that the words "comprise," "comprising," "include," "including," and / or "has," "having," when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when terms such as "at least one of" are used, this is meant to instill an inclusionary meaning, as opposed to an exclusive one. Moreover, when describing the embodiments of the present application, the use of "can" means "one or more embodiments of the present application." Also, the use of terminology "example" with respect to certain features indicates that such features are exemplified and that not all embodiments need necessarily include such features. Other meanings of "example" can include "for the purpose of example" or "not necessarily the only or preferred ones."

[0071] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an overly literal or overly formal sense unless expressly so defined herein.

[0072] It should be noted that the embodiments and features of the present application can be combined with each other, if not in conflict. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0073] The features, principles, and other aspects of the present application are described in detail below.

[0074] In an example embodiment, the optical lens includes, for example, seven lenses with optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven lenses are arranged in order along an optical axis from an object side to an image side.

[0075] In an example embodiment, the optical lens can further include a photosensitive element disposed at the imaging plane. Optionally, the photosensitive element disposed at the imaging plane can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS).

[0076] The first lens can have a negative optical power and have a meniscus shape, the object side surface of which can be convex, and the image side surface of which can be concave. This optical power and surface configuration of the first lens is advantageous for collecting incident light rays of a large field of view, so that more light rays enter the rear optical system smoothly, thereby increasing the light flux and improving the imaging quality of the optical system. In actual applications, vehicle-mounted lenses are generally exposed to external environments. Such a convex object-side meniscus lens is advantageous for rain and snow to slide off the lens, prolonging the service life of the lens and reducing the adverse effects of rain and snow on the imaging of the lens.

[0077] The second lens can have negative focal power, and its object side surface can be concave while its image side surface is convex. Such a configuration of the second lens in terms of focal power and surface shape is conducive to the smooth entry of light rays into the rear optical system and the improvement of the resolution quality of the optical system, and conducive to the collection of more incident light rays of a large field angle and the entry of the light rays into the rear optical system, thereby increasing the light flux.

[0078] The third lens can have positive focal power, and its object side surface and image side surface can both be convex. The positive focal power of the third lens is conducive to the convergence of light rays, the reduction of the aperture of the optical barrel and the barrel length, and the miniaturization of the lens.

[0079] The fourth lens can have positive or negative focal power, and its object side surface can be concave while its image side surface is convex, or its object side surface can be convex while its image side surface is concave, or its object side surface and image side surface are both concave. The provision of the fourth lens in the optical system is conducive to the correction of aberrations generated by the front lens group, the convergence of the light beam, the increase of the aperture of the lens, and the compactness of the structure of the optical system, the shortening of the total length of the lens, and the relatively short overall length of the optical system.

[0080] The fifth lens can have positive focal power, and its object side surface and image side surface can both be convex.

[0081] The sixth lens can have negative focal power, and its object side surface can be concave while its image side surface is convex.

[0082] The seventh lens can have positive focal power, and its object side surface can be convex while its image side surface is concave, or its object side surface can be concave while its image side surface is convex, or its object side surface and image side surface are both convex. Such a configuration of the seventh lens in terms of focal power and surface shape is conducive to the smoothing of the trend of the front light rays and the reduction of the CRA and the improvement of the resolution quality of the system.

[0083] In the exemplary embodiments, a diaphragm can be arranged between the second lens and the third lens to limit the light beam and further improve the imaging quality of the optical lens. The diaphragm is conducive to the effective collection of the light rays entering the optical system, the shortening of the overall length of the system, and the reduction of the aperture of the lens. In the embodiments, the diaphragm can be arranged near the image side surface of the second lens or near the object side surface of the third lens. However, it should be noted that the position of the diaphragm disclosed herein is only an example and not a limitation; in alternative embodiments, the diaphragm can also be arranged at other positions as needed.

[0084] In exemplary embodiments, the optical lens according to the present application can further comprise a filter disposed between the seventh lens and the imaging plane to filter light rays having different wavelengths, as needed. The optical lens according to the present application can further comprise a protective glass disposed between the seventh lens and the imaging plane to prevent damage to the image-side elements (e.g., a chip) of the optical lens.

[0085] As known by 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 reflection loss of light energy, and thus improve the clarity of lens imaging. In addition, the use of cemented lenses can also simplify the assembly procedure in the lens manufacturing process.

[0086] In exemplary embodiments, the fifth lens and the sixth lens are cemented to form a cemented lens. The fifth lens, which has both a convex object-side surface and a convex image-side surface, and the sixth lens, which has a concave object-side surface and a convex image-side surface, are cemented, which is conducive to smoothly transitioning the light rays exiting the fourth lens to the imaging plane, reducing the total length of the optical system, and correcting various aberrations of the optical system, thereby improving the system resolution, optimizing the distortion and CRA, and other optical performance on the premise of compact optical system structure. The cemented lenses have at least one of the following advantages: reducing their own chromatic aberration, reducing tolerance sensitivity, balancing the overall chromatic aberration of the system through residual partial chromatic aberration, reducing the air gap between the two lenses and thus reducing the total length of the system, reducing the assembly components between the lenses and thus reducing the process and cost, reducing the tolerance sensitivity problems of the lens unit caused by the inclination / offset during the assembly process, improving the production yield, reducing the light loss caused by reflection between the lenses, improving the illumination, further reducing the field curvature, and effectively correcting the off-axis point aberration of the optical lens. Such cemented design shares the overall chromatic aberration correction of the system, effectively corrects the aberration to improve the resolving power, and makes the optical system overall compact, meeting the miniaturization requirement.

[0087] In exemplary embodiments, the curvature radius R3 of the object-side surface of the second lens and the curvature radius R4 of the image-side surface of the second lens satisfy: |R3 / R4|≤15, for example, |R3 / R4|≤8. Reasonably setting the ratio of the curvature radius of the object-side surface of the second lens to the curvature radius of the image-side surface of the second lens makes the curvature radius of the object-side surface and the curvature radius of the image-side surface similar or the object-side surface more curved than the image-side surface, which is conducive to correcting the aberration of the optical system and improving the image quality.

[0088] In exemplary embodiments, a distance TTL from an object side surface of the first lens to an imaging surface of the optical lens on the optical axis satisfies TTL / F≤9, for example, TTL / F≤8, where F is a total effective focal length of the optical lens. In this application, the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens is also referred to as a total length of the optical lens. Reasonably controlling the ratio between the total length of the optical lens and the total effective focal length is conducive to better performance of the optical lens and miniaturization of the lens.

[0089] In exemplary embodiments, the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens, a maximum field of view FOV of the optical lens, and an image height H corresponding to the maximum field of view FOV satisfy TTL / H / FOV≤0.06, for example, TTL / H / FOV≤0.05. Reasonably setting the mutual relationship among the above three is conducive to miniaturization of the lens, so that the optical system has a smaller lens size under the condition of the same imaging surface and the same image height.

[0090] In exemplary embodiments, the maximum field of view FOV of the optical lens, a maximum light passing aperture D of the object side surface of the first lens corresponding to the maximum field of view FOV, and the image height H corresponding to the maximum field of view FOV satisfy D / H / FOV≤0.025, for example, D / H / FOV≤0.02. Reasonably setting the mutual relationship among the above three is conducive to reducing the front aperture of the optical lens and miniaturization.

[0091] In exemplary embodiments, an effective focal length F5 of the fifth lens and an effective focal length F6 of the sixth lens satisfy 0.1≤|F5 / F6|≤1.6, for example, 0.1≤|F5 / F6|≤1.5. Reasonably setting the ratio between the effective focal length of the fifth lens and the effective focal length of the sixth lens makes the focal lengths of the fifth lens and the sixth lens similar, which is conducive to smooth transition of light and correction of chromatic aberration of the system.

[0092] In exemplary embodiments, a maximum value p of a ratio between the central thicknesses of any two lenses among the first lens to the seventh lens on the optical axis satisfies 2≤p≤8, for example, 3≤p≤7.2. The ratio between the central thicknesses of any two lenses among the first lens to the seventh lens on the optical axis is between 2 and 8 (including 2 and 8), which makes the thicknesses between the lenses in the optical lens uniform and is conducive to stable action of each lens. In a high-low temperature change environment, the light in the optical system changes less, so that the optical system has good temperature adaptability.

[0093] In exemplary embodiments, the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: |R13 / R14|≤15, for example, |R13 / R14|≤8. Reasonably setting the proportional relationship between the radius of curvature of the object side surface of the seventh lens and the radius of curvature of the image side surface of the seventh lens makes the radii of curvature of the object side surface and the image side surface similar, which is beneficial to the light entering the optical system gently and improves the resolution quality of the system.

[0094] In exemplary embodiments, the combined focal length F56 of the fifth lens and the sixth lens and the total effective focal length F of the optical lens satisfy: 3≤|F56 / F|≤10, for example, 3≤|F56 / F|≤9.5. Reasonably setting the proportional relationship between the combined focal length of the fifth lens and the sixth lens and the total effective focal length of the optical lens is beneficial to achieving thermal compensation of the system.

[0095] In exemplary embodiments, 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 FOV satisfy: (FOV×F) / H≥50, for example, (FOV×F) / H≥55. Reasonably setting the mutual relationship of the above three is beneficial to the optical lens having both large field of view and long focal characteristics, and realizing large angular resolution.

[0096] In exemplary embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: 0.02≤(R3-R4) / (R3+R4)≤0.4, for example, 0.03≤(R3-R4) / (R3+R4)≤0.3. Setting the radius of curvature of the object side surface of the second lens and the radius of curvature of the image side surface of the second lens to satisfy the above relationship is beneficial to correcting the aberration of the optical system, so that when the light emitted from the second lens is incident on the object side surface of the third lens, the incident angle of the light is not too large, thereby reducing the tolerance sensitivity of the optical system. If the numerical limit of the above condition formula exceeds the upper limit value, the aberration of the optical system may not be fully corrected; if the numerical limit of the above condition formula is lower than the lower limit value, the incident angle of the light emitted from the first lens to the object side surface of the second lens may be too large, which increases the sensitivity of the optical system.

[0097] In exemplary embodiments, the total effective focal length F of the optical lens and the radius of curvature R1 of the object side surface of the first lens satisfy: |F / R1|≤1.5, for example, |F / R1|≤1. Reasonably setting the proportional relationship between the total effective focal length of the optical lens and the radius of curvature of the object side surface of the first lens is beneficial to avoiding too small curvature of the object side surface of the first lens and aberration caused by too small curvature of the object side surface when the light is incident, and is also beneficial to the processing and manufacturing of the first lens.

[0098] In exemplary embodiments, the ratio of the radius of curvature R1 of the object side surface of the first lens to the radius of curvature R2 of the image side surface of the first lens satisfies: R1 / R2≤30, for example, R1 / R2≤20. Reasonably setting the ratio of the radius of curvature of the object side surface of the first lens to the radius of curvature of the image side surface of the first lens satisfies the special shape setting of the first lens, which is beneficial to improve the resolution of the optical system.

[0099] In exemplary embodiments, the ratio of the total effective focal length F of the optical lens to the image height H corresponding to the maximum field angle of the optical lens satisfies: F / H≤3, for example, F / H≤2. Reasonably setting the ratio of the total effective focal length of the optical lens to the image height corresponding to the maximum field angle of the optical lens satisfies the above condition, which is beneficial to realize the long-focus characteristics of the optical system and improve the resolution of the optical system.

[0100] In exemplary embodiments, the ratio of the effective focal length F1 of the first lens to the total effective focal length F of the optical lens satisfies: |F1 / F|≥1, for example, 1≤|F1 / F|≤50. Reasonably setting the ratio of the effective focal length of the first lens to the total effective focal length of the optical lens is beneficial to more light entering the optical system smoothly and improve the illumination of the optical system.

[0101] In exemplary embodiments, the ratio of the effective focal length F2 of the second lens to the total effective focal length F of the optical lens satisfies: |F2 / F|≥1, for example, 1≤|F2 / F|≤95. Reasonably setting the ratio of the effective focal length of the second lens to the total effective focal length of the optical lens is beneficial to balance various aberrations in the optical system.

[0102] In exemplary embodiments, the ratio of the effective focal length F3 of the third lens to the total effective focal length F of the optical lens satisfies: |F3 / F|≥1, for example, 1≤|F3 / F|≤50. Reasonably setting the ratio of the effective focal length of the third lens to the total effective focal length of the optical lens is beneficial to balance various aberrations in the optical system.

[0103] In exemplary embodiments, the ratio of the effective focal length F4 of the fourth lens to the total effective focal length F of the optical lens satisfies: |F4 / F|≥1, for example, 1≤|F4 / F|≤50. Reasonably setting the ratio of the effective focal length of the fourth lens to the total effective focal length of the optical lens is beneficial to balance various aberrations in the optical system.

[0104] In exemplary embodiments, the ratio of the effective focal length F5 of the fifth lens to the total effective focal length F of the optical lens satisfies: |F5 / F|≥0.05, for example, 0.05≤|F5 / F|≤50. Reasonably setting the ratio of the effective focal length of the fifth lens to the total effective focal length of the optical lens is beneficial to balance various aberrations in the optical system.

[0105] In exemplary embodiments, the effective focal length F6 of the sixth lens and the total effective focal length F of the optical lens satisfy: |F6 / F|≥1, for example, 1≤|F6 / F|≤50. Reasonably setting the ratio of the effective focal length of the sixth lens to the total effective focal length of the optical lens is conducive to balancing various aberrations in the optical system.

[0106] In exemplary embodiments, the effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: |F7 / F|≥1, for example, 1≤|F7 / F|≤50. Reasonably setting the ratio of the effective focal length of the seventh lens to the total effective focal length of the optical lens is conducive to balancing various aberrations in the optical system.

[0107] In exemplary embodiments, the first lens, the fourth lens, and the seventh lens are all aspherical lenses. The aspherical lens is characterized by a continuously changing curvature from the center to the periphery of the lens. Unlike a spherical lens with constant curvature from the center to the periphery, the aspherical lens has better curvature radius characteristics, with the advantages of improving distortion aberration and improving astigmatism aberration. After using 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 system aberration and improve resolution. Specifically, at least one lens of the first lens, the fourth lens, and the seventh lens is an aspherical lens, which is conducive to improving the resolution quality of the optical system.

[0108] The optical lens according to the above embodiments of the present application achieves a high resolution quality of the optical system by reasonable setting of the shapes and optical powers of the lenses, while taking into account the low cost requirements of small size, low sensitivity, and high production yield, by using only 7 lenses. The optical lens also has a small CRA feature, which is conducive to avoiding stray light caused by light hitting the lens barrel when exiting the rear end of the system, and can well match the vehicle-mounted chip to avoid color deviation and dark corner phenomenon. At the same time, the optical lens also has the advantages of good temperature adaptability, small change in imaging effect under high and low temperature environments, stable image quality, and being conducive to accurate ranging of binocular lenses.

[0109] The optical lens according to the above embodiments of the present application shares the overall chromatic aberration correction of the system by setting the cemented lens, which is conducive to correcting system aberration, improving system resolution quality, and making the overall structure of the optical system compact to meet the miniaturization requirement.

[0110] In the exemplary embodiments, the first lens to the seventh lens in the optical lens can all be made of glass. The optical lens made of glass can suppress the shift of the back focal length of the optical lens with temperature change, so as to improve the system stability. Meanwhile, the use of glass material can avoid the imaging blur of the lens caused by the high and low temperature change in the use environment, so as to affect the normal use of the lens. Specifically, when the image quality and reliability are focused on, the first lens to the seventh lens can all be glass aspherical lenses. Of course, in the application occasions with low temperature stability requirement, the first lens to the seventh lens in the optical lens can also all be made of plastic. The optical lens made of plastic can effectively reduce the manufacturing cost.

[0111] However, those skilled in the art should understand that the number of lenses constituting the lens can be changed without departing from the technical solutions claimed in the present application, so as to obtain the various results and advantages described in the present specification. For example, although the seven lenses are described as an example in the embodiments, the optical lens is not limited to including seven lenses. If necessary, the optical lens can also include other number of lenses.

[0112] The specific embodiments of the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0113] Example 1

[0114] The following refers to Figure 1 The optical lens according to Embodiment 1 of the present application is described. Figure 1 The structural schematic diagram of the optical lens according to Embodiment 1 of the present application is shown.

[0115] As Figure 1 shown, the optical lens includes, in order from the object side to the image side along the optical axis, 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.

[0116] The first lens L1 is a meniscus lens with negative focal power, the object side S1 is a convex surface, and the image side S2 is a concave surface. The second lens L2 is a meniscus lens with negative focal power, the object side S3 is a concave surface, and the image side S4 is a convex surface. The third lens L3 is a double convex lens with positive focal power, the object side S6 is a convex surface, and the image side S7 is a convex surface. The fourth lens L4 is a meniscus lens with positive focal power, the object side S8 is a concave surface, and the image side S9 is a convex surface. The fifth lens L5 is a double convex lens with positive focal power, the object side S10 is a convex surface, and the image side S11 is a convex surface. The sixth lens L6 is a meniscus lens with negative focal power, the object side S11 is a concave surface, and the image side S12 is a convex surface. The seventh lens L7 is a meniscus lens with positive focal power, the object side S13 is a convex surface, and the image side S14 is a concave surface. The fifth lens L5 and the sixth lens L6 can be glued to form a glued lens.

[0117] The optical lens can further include a stop STO, which can be arranged between the second lens L2 and the third lens L3 to improve the imaging quality. For example, the stop STO can be arranged close to the object side S4 of the second lens L2.

[0118] In this embodiment, the object side and the image side of the first lens L1, the fourth lens L4, and the seventh lens L7 can all be aspherical surfaces.

[0119] Optionally, the optical lens can further include a filter L8 with an object side S15 and an image side S16, which can be used to correct color deviation, and / or a protective glass L8', which can be used to protect the image sensor chip IMA located at the imaging surface S17. Light from an object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.

[0120] Table 1 shows the radius of curvature R, the thickness T (it should be understood that the thickness T in the row of S1 is the central thickness of the first lens L1, the thickness T in the row of S2 is the air gap d12 between the first lens L1 and the second lens L2, and so on), the refractive index Nd, and the Abbe number Vd of each lens of the optical lens of Embodiment 1.

[0121]

[0122] Table 1

[0123] This embodiment takes seven lenses as an example. By reasonably allocating the focal power and surface type of each lens, the central thickness of each lens, and the air gap between each lens, the lens can have at least one of the beneficial effects of high resolution, miniaturization, small front end, small CRA, good temperature performance, etc. Each aspherical surface type Z is defined by the following formula:

[0124]

[0125] Where Z 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; A, B, C, D, E, and F are all higher-order coefficients. Table 2 below shows the conic coefficient K and higher-order coefficients A, B, C, D, E, and F for the aspherical lens surfaces S3, S4, S8, S9, S13, and S14 that can be used in Example 1.

[0126] Face number K A B C D E F S1 -8.6121 -5.0316E-03 3.9273E-04 -1.7811E-05 4.6377E-07 -5.3068E-09 -3.3430E-12 S2 -1.0931 -8.9657E-03 1.3765E-03 -1.0080E-04 5.4080E-06 2.2167E-09 2.3398E-09 S8 1.3447 1.0766E-04 9.3327E-06 3.9776E-06 -1.0435E-07 -3.6960E-09 -5.0236E-10 S9 0.5701 9.9179E-05 5.5981E-05 1.7244E-06 -3.5205E-09 -6.9574E-09 1.6033E-10 S13 -5.0799 -2.7587E-03 3.3126E-05 1.4172E-06 -6.0270E-09 1.6360E-09 -1.4752E-10 S14 -64.7854 -3.2058E-03 5.7797E-05 4.9622E-07 -2.1064E-08 1.8172E-09 -2.4383E-11

[0127] Table 2

[0128] Example 2

[0129] The following is for reference Figure 2 An optical lens according to Embodiment 2 of this application is described. In this embodiment and the following embodiments, for the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted. Figure 2 A schematic diagram of the structure of an optical lens according to Embodiment 2 of this application is shown.

[0130] 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.

[0131] The first lens L1 is a meniscus 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 meniscus 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 S6 is convex, and its image-side surface S7 is convex. The fourth lens L4 is a meniscus lens with negative optical power, its object-side surface S8 is concave, and its image-side surface S9 is concave. 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 meniscus lens with negative optical power, its object-side surface S11 is concave, and its image-side surface S12 is convex. The seventh lens L7 is a meniscus lens with positive optical power, its object-side surface S13 is convex, and its image-side surface S14 is concave. The fifth lens L5 and the sixth lens L6 can be cemented together to form a cemented lens.

[0132] 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.

[0133] In the embodiment, the object side surface and the image side surface of the first lens L1, the fourth lens L4 and the seventh lens L7 can all be aspherical surfaces.

[0134] Optionally, the optical lens can further include a filter L8 having an object side surface S15 and an image side surface S16, which can be used to correct chromatic aberration, and / or a protection glass L8', which can be used to protect the image sensor chip IMA located at the imaging surface S17. Light from an object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.

[0135] Table 3 shows the radius of curvature R, the thickness T, the refractive index Nd and the Abbe number Vd of each lens of the optical lens of embodiment 2.

[0136]

[0137]

[0138] Table 3

[0139] The following table 4 gives the conic constant K and the high order coefficients A, B, C, D, E and F of the aspherical lens surfaces S1, S2, S8, S9, S13 and S14 which can be used in embodiment 2.

[0140] Face number K A B C D E F S1 0.1253 -5.1880E-03 3.5150E-04 -1.7414E-05 4.5977E-07 -5.6025E-09 6.0397E-12 S2 -0.4627 -7.8130E-03 3.3192E-04 1.4159E-05 -3.1150E-06 -8.4308E-08 -5.1591E-09 S8 23.2794 -8.4908E-05 5.5277E-05 -9.4002E-06 8.9923E-07 -9.9064E-09 -5.9767E-09 S9 96.1771 2.6816E-04 5.2012E-05 -1.0645E-06 -1.8913E-07 -3.0919E-08 5.9905E-09 S13 -0.5644 -1.5642E-03 6.5637E-06 -2.4673E-06 -3.0164E-08 -9.3978E-11 -1.2741E-10 S14 -0.0829 -1.7987E-03 7.2015E-05 -1.0871E-05 2.9941E-07 -7.7890E-10 -2.7160E-10

[0141] Table 4

[0142] Example 3

[0143] The following refers to Figure 3 An optical lens according to embodiment 3 of the present application is described. Figure 3 A structure schematic diagram of the optical lens according to embodiment 3 of the present application is shown.

[0144] As Figure 3 shown, the optical lens sequentially 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 along the optical axis from the object side to the image side.

[0145] The first lens L1 is a meniscus lens with negative focal power, the object side S1 is a convex surface, and the image side S2 is a concave surface. The second lens L2 is a meniscus lens with negative focal power, the object side S3 is a concave surface, and the image side S4 is a convex surface. The third lens L3 is a double convex lens with positive focal power, the object side S6 is a convex surface, and the image side S7 is a convex surface. The fourth lens L4 is a meniscus lens with negative focal power, the object side S8 is a convex surface, and the image side S9 is a concave surface. The fifth lens L5 is a double convex lens with positive focal power, the object side S10 is a convex surface, and the image side S11 is a convex surface. The sixth lens L6 is a meniscus lens with negative focal power, the object side S11 is a concave surface, and the image side S12 is a convex surface. The seventh lens L7 is a meniscus lens with positive focal power, the object side S13 is a convex surface, and the image side S14 is a concave surface. The fifth lens L5 and the sixth lens L6 can be glued to form a glued lens.

[0146] The optical lens can further include a stop STO, which can be disposed between the third lens L3 and the fourth lens L4 to improve the imaging quality. For example, the stop STO can be disposed close to the object side S6 of the third lens L3.

[0147] In this embodiment, the object side and the image side of the first lens L1, the fourth lens L4, and the seventh lens L7 can all be aspherical surfaces.

[0148] Optionally, the optical lens can further include a filter L8 with an object side S15 and an image side S16, which can be used to correct color deviation, and / or a protective glass L8', which can be used to protect the image sensor chip IMA located at the imaging surface S17. Light from an object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.

[0149] Table 5 shows the curvature radius R, the thickness T, the refractive index Nd, and the Abbe number Vd of each lens of the optical lens of embodiment 3.

[0150]

[0151] Table 5

[0152] The following table 6 gives the conic constant K and the high-order term coefficients A, B, C, D, E, and F of the aspherical lens surfaces S1, S2, S8, S9, S13, and S14 that can be used in embodiment 3.

[0153] Face number K A B C D E F S1 -1.1808 -6.9706E-03 4.3652E-04 -1.6320E-05 3.4132E-07 -3.1525E-09 3.0514E-12 S2 -0.6520 -1.2910E-02 5.1764E-04 -3.7246E-06 -2.5544E-06 2.7265E-09 2.4055E-09 S8 -99.0000 -1.6697E-03 1.2784E-04 -1.8930E-05 8.4212E-07 -3.7826E-09 -5.1172E-10 S9 2.2552 -1.7364E-03 1.7735E-04 -1.6706E-05 3.6523E-07 -7.0350E-09 1.4336E-10 S13 -1.2000 -1.7521E-03 -7.6970E-06 -3.0484E-06 -1.7010E-07 1.6820E-09 -1.4363E-10 S14 0.2328 -1.9796E-03 1.3886E-05 -8.1978E-06 1.2570E-07 1.8044E-09 -2.5365E-11

[0154] Table 6

[0155] Example 4

[0156] The following refers to Figure 4An optical lens according to Embodiment 4 of the present application is described. Figure 4 A structural schematic diagram of the optical lens according to Embodiment 4 of the present application is shown.

[0157] As shown in Figure 4 the optical lens sequentially 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 along an optical axis from an object side to an image side.

[0158] The first lens L1 is a meniscus lens with negative refractive power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface. The second lens L2 is a meniscus lens with negative refractive power, the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface. The third lens L3 is a double convex lens with positive refractive power, the object side surface S6 is a convex surface, and the image side surface S7 is a convex surface. The fourth lens L4 is a meniscus lens with negative refractive power, the object side surface S8 is a concave surface, and the image side surface S9 is a convex surface. The fifth lens L5 is a double convex lens with positive refractive power, the object side surface S10 is a convex surface, and the image side surface S11 is a convex surface. The sixth lens L6 is a meniscus lens with negative refractive power, the object side surface S11 is a concave surface, and the image side surface S12 is a convex surface. The seventh lens L7 is a meniscus lens with positive refractive power, the object side surface S13 is a convex surface, and the image side surface S14 is a convex surface. The fifth lens L5 and the sixth lens L6 can be glued to form a glued lens.

[0159] The optical lens can further include a stop STO, which can be arranged between the third lens L3 and the fourth lens L4 to improve the imaging quality. For example, the stop STO can be arranged close to the image side surface S4 of the second lens L2.

[0160] In this embodiment, the object side surface and the image side surface of the first lens L1, the fourth lens L4, and the seventh lens L7 can all be aspherical surfaces.

[0161] Optionally, the optical lens can further include a filter L8 with an object side surface S15 and an image side surface S16, which can be used to correct color deviation, and / or a protective glass L8', which can be used to protect an image sensor chip IMA located at an imaging surface S17. Light from an object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.

[0162] Table 7 shows the curvature radius R, the thickness T, the refractive index Nd, and the Abbe number Vd of each lens of the optical lens of Embodiment 4.

[0163]

[0164] Table 7

[0165] The following Table 8 gives the conic coefficients K and the higher order coefficients A, B, C, D, E and F for the aspherical lens surfaces S1, S2, S8, S9, S13 and S14 used in Example 4.

[0166]

[0167]

[0168] Table 8

[0169] Example 5

[0170] The following refers to Figure 5 An optical lens according to Example 5 of the present application is described. Figure 5 A structural schematic diagram of an optical lens according to Example 5 of the present application is shown.

[0171] As Figure 5 shown, the optical lens comprises, in order from the object side to the image side along the optical axis, 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.

[0172] The first lens L1 is a meniscus lens with negative refractive power, the object side surface S1 of which is convex, and the image side surface S2 of which is concave. The second lens L2 is a meniscus lens with negative refractive power, the object side surface S3 of which is concave, and the image side surface S4 of which is convex. The third lens L3 is a double convex lens with positive refractive power, the object side surface S6 of which is convex, and the image side surface S7 of which is convex. The fourth lens L4 is a meniscus lens with negative refractive power, the object side surface S8 of which is concave, and the image side surface S9 of which is convex. The fifth lens L5 is a double convex lens with positive refractive power, the object side surface S10 of which is convex, and the image side surface S11 of which is convex. The sixth lens L6 is a meniscus lens with negative refractive power, the object side surface S11 of which is concave, and the image side surface S12 of which is convex. The seventh lens L7 is a meniscus lens with positive refractive power, the object side surface S13 of which is concave, and the image side surface S14 of which is convex. The fifth lens L5 and the sixth lens L6 can be cemented to form a cemented lens.

[0173] The optical lens can further comprise a stop STO, which can be arranged between the third lens L3 and the fourth lens L4 to improve the imaging quality. For example, the stop STO can be arranged close to the object side surface S4 of the second lens L2.

[0174] In the present embodiment, the object side surface and the image side surface of the first lens L1, the fourth lens L4 and the seventh lens L7 can all be aspherical.

[0175] Optionally, the optical lens can further include a filter L8 having an object side S15 and an image side S16, which can be used to correct chromatic aberration, and / or a protective glass L8', which can be used to protect the image sensor chip IMA located at the imaging surface S17. Light from the object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.

[0176] Table 9 shows the radius of curvature R, thickness T, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 5.

[0177]

[0178]

[0179] Table 9

[0180] The following Table 10 gives the conic constant K and the high-order term coefficients A, B, C, D, E and F of the aspherical lens surfaces S1, S2, S8, S9, S13 and S14 that can be used in Example 5.

[0181] Face number K A B C D E F S1 -2.46E+00 -5.48E-03 4.03E-04 -1.74E-05 4.04E-07 -3.80E-09 -3.41E-12 S2 -7.24E-01 -8.25E-03 7.63E-04 -2.30E-05 2.53E-06 2.73E-09 2.41E-09 S8 -1.39E+01 2.23E-04 3.19E-05 -3.41E-06 3.96E-08 -3.78E-09 -5.12E-10 S9 -9.90E+01 5.84E-04 3.20E-05 3.49E-06 -4.07E-07 -7.04E-09 1.43E-10 S13 9.90E+01 -3.88E-03 2.82E-05 5.33E-06 -3.20E-07 1.68E-09 -1.44E-10 S14 1.67E+00 -2.79E-03 1.07E-04 -2.00E-07 -9.68E-08 1.80E-09 -2.54E-11

[0182] Table 10

[0183] In summary, Examples 1 to 5 respectively satisfy the relationships shown in the following Table 11. In Table 13, the units of F1, F2, F3, F4, F5, F6, F7, F56, TTL, H, F, D, R1, R2, R3, R4, R13, R14 are millimeters (mm), and the unit of FOV is degree (°).

[0184]

[0185]

[0186] Table 11

[0187] Examples 1 to 5 respectively satisfy the relationships shown in the following Table 12. In Table 12, the units of d1, d2, d3, d4, d5, d6, d7, dn(max), dm(min) are millimeters (mm).

[0188] d1 to d7 respectively correspond to the central thickness of each lens in the first to seventh lenses on the optical axis; dn(max) is the maximum central thickness value among the central thicknesses of the lenses in the first to seventh lenses on the optical axis, dm(min) is the minimum central thickness value among the central thicknesses of the lenses in the first to seventh lenses on the optical axis; max{dn:dm} is the maximum value of the ratio of the central thicknesses of any two lenses in the first to seventh lenses on the optical axis, i.e. p as described above.

[0189] Conditional expression\Example Example 1 Example 2 Example 3 Example 4 Example 5 d1 0.9050 1.2000 1.2000 1.2000 1.2000 d2 4.7000 4.9799 3.6344 4.7119 4.6584 d3 2.4580 2.1651 1.9765 2.6249 2.6335 d4 1.5073 0.7000 1.0000 0.8000 0.8284 d5 3.2296 4.0140 3.2696 3.0632 2.9000 d6 2.3354 0.8487 1.0000 1.2371 0.8000 d7 2.4592 2.2035 1.4554 2.3861 2.3959 dn(max) 4.7000 4.9799 3.6344 4.7119 4.6584 dm(min) 0.9050 0.7000 1.0000 0.8000 0.8000 max{dn:dm} 5.1936 7.1141 3.6344 5.8899 5.8230

[0190] Table 12

[0191] The present application also provides an electronic device, which can include the optical lens according to the above-mentioned embodiments of the present application and an imaging element for converting the optical image formed by the optical lens into an electrical signal. The electronic device can be a stand-alone electronic device such as a distance detection camera, or an imaging module integrated on a distance detection device such as an auxiliary driving system. In addition, the electronic device can also be a stand-alone imaging device such as a vehicle-mounted camera, or an imaging module integrated on an auxiliary driving system.

[0192] The above description is merely preferred embodiments of the present application and a description of the principles of the technology used. Those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and 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 can be replaced with technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.

Claims

1. An optical lens characterized in that, The optical lens has seven pieces of lenses with optical power, and sequentially comprises, from the object side to the image side along the optical axis of the optical lens: 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; a fifth lens having positive optical power, the object side surface of the fifth lens being convex, and the image side surface of the fifth lens being convex; a sixth lens having negative optical power, the object side surface of the sixth lens being concave; a seventh lens having positive optical power; wherein the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 0.512≤|R3 / R4|≤0.7735; the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens satisfy: 0.6272≤|R13 / R14|≤0.7948; the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 0.02≤(R3-R4) / (R3+R4)≤0.4; the effective focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy: 8.1984≤|F2 / F|≤21.1528; the maximum field angle FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field angle FOV satisfy: 55≤(FOV×F) / H≤75.4529.

2. The optical lens of claim 1, wherein, the image side surface of the third lens is convex.

3. The optical lens of claim 1, wherein, the fourth lens has positive optical power, the object side surface of the fourth lens is concave, and the image side surface of the fourth lens is convex.

4. The optical lens of claim 1, wherein, the fourth lens has negative optical power, the object side surface of the fourth lens is concave, and the image side surface of the fourth lens is concave; or the object side surface of the fourth lens is concave, and the image side surface of the fourth lens is convex; or the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave.

5. The optical lens of claim 1, wherein, the image side surface of the sixth lens is convex.

6. The optical lens according to claim 1, wherein, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave; or the object side surface of the seventh lens is concave, and the image side surface of the seventh lens is convex; or the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is convex.

7. The optical lens of any of claims 1 to 6, wherein, at least one of the following conditional expressions is satisfied: TTL / F ≤ 9, |F / R1| ≤ 1.5, R1 / R2 ≤ 30, |F1 / F| ≥ 1, wherein TTL is a distance from an object side surface of the first lens to an imaging surface of the optical lens on the optical axis, F is a total effective focal length of the optical lens, R1 is a curvature radius of the object side surface of the first lens, R2 is a curvature radius of an image side surface of the first lens, and F1 is an effective focal length of the first lens.

8. The optical lens of any of claims 1 to 6, wherein, at least one of the following conditional expressions is satisfied: TTL / F ≤ 8, |F / R1| ≤ 1, R1 / R2 ≤ 20, 1 ≤ |F1 / F| ≤ 50, wherein TTL is a distance from an object side surface of the first lens to an imaging surface of the optical lens on the optical axis, F is a total effective focal length of the optical lens, R1 is a curvature radius of the object side surface of the first lens, R2 is a curvature radius of an image side surface of the first lens, and F1 is an effective focal length of the first lens.

9. The optical lens of any of claims 1 to 6, wherein, at least one of the following conditional expressions is satisfied: 5.2769 ≤ TTL / F ≤ 6.0685, 0.6507 ≤ |F / R1| ≤ 0.9175, 2.3606 ≤ R1 / R2 ≤ 2.872, 1.468 ≤ |F1 / F| ≤ 1.6491, wherein TTL is a distance from an object side surface of the first lens to an imaging surface of the optical lens on the optical axis, F is a total effective focal length of the optical lens, R1 is a curvature radius of the object side surface of the first lens, R2 is a curvature radius of an image side surface of the first lens, and F1 is an effective focal length of the first lens. at least one of the following conditional expressions is satisfied: 0.1 ≤ |F5 / F6| ≤ 1.6, |F3 / F| ≥ 1, |F4 / F| ≥ 1, |F5 / F| ≥ 0.05, |F6 / F| ≥ 1, |F7 / F| ≥ 1, wherein F5 is an effective focal length of the fifth lens, F6 is an effective focal length of the sixth lens, F3 is an effective focal length of the third lens, F is a total effective focal length of the optical lens, F4 is an effective focal length of the fourth lens, and F7 is an effective focal length of the seventh lens.

10. The optical lens of any of claims 1 to 6, wherein, at least one of the following conditional expressions is satisfied: D / H / FOV ≤ 0.025, 0.9820 ≤ F / H ≤ 3, wherein FOV is a maximum field of view angle of the optical lens, D is a maximum light-passing aperture of the object side surface of the first lens corresponding to the FOV, H is an image height corresponding to the FOV, and F is a total effective focal length of the optical lens.

11. The optical lens of any of claims 1 to 6, wherein, at least one of the following conditional expressions is satisfied: 2 ≤ p ≤ 8, 3 ≤ |F56 / F| ≤ 10, wherein p is a maximum value of a ratio of central thicknesses of any two lenses from the first lens to the seventh lens on the optical axis, F56 is a combined focal length of the fifth lens and the sixth lens, and F is a total effective focal length of the optical lens.

12. The optical lens of any of claims 1 to 6, wherein, ​ 13. The optical lens of any of claims 1 to 6, wherein, meets at least one of the following conditional expressions: 0.1≤|F5 / F6|≤1.5, 1≤|F3 / F|≤50, 1≤|F4 / F|≤50, 0.05≤|F5 / F|≤50, 1≤|F6 / F|≤50, 1≤|F7 / F|≤50, D / H / FOV≤0.02, F / H≤2, 3≤p≤7.2, 3≤|F56 / F|≤9.5, wherein F5 is an effective focal length of the fifth lens, F6 is an effective focal length of the sixth lens, F3 is an effective focal length of the third lens, F is a total effective focal length of the optical lens, F4 is an effective focal length of the fourth lens, F7 is an effective focal length of the seventh lens, FOV is a maximum field of view of the optical lens, D is a maximum clear aperture of an object side surface of the first lens corresponding to the FOV, H is an image height corresponding to the FOV, p is a maximum value of a ratio of central thicknesses of any two lenses from the first lens to the seventh lens on the optical axis, and F56 is a combined focal length of the fifth lens and the sixth lens.

14. The optical lens of any of claims 1 to 6, wherein, meets at least one of the following conditional expressions: 0.1661≤|F5 / F6|≤0.5578, 1.1683≤|F3 / F|≤1.8459, 4.768≤|F4 / F|≤18.6711, 1.3822≤|F5 / F|≤6.5485, 0.0818≤|F6 / F|≤1.5114, 5.5943≤|F7 / F|≤16.6252, 0.0187≤D / H / FOV≤0.0228, 58.9191≤(FOV×F) / H≤75.4529, 0.982≤F / H≤1.2575, 3.6344≤p≤7.1141, 3.1578≤|F56 / F|≤9.1011, wherein F5 is an effective focal length of the fifth lens, F6 is an effective focal length of the sixth lens, F3 is an effective focal length of the third lens, F is a total effective focal length of the optical lens, F4 is an effective focal length of the fourth lens, F7 is an effective focal length of the seventh lens, FOV is a maximum field of view of the optical lens, D is a maximum clear aperture of an object side surface of the first lens corresponding to the FOV, H is an image height corresponding to the FOV, p is a maximum value of a ratio of central thicknesses of any two lenses from the first lens to the seventh lens on the optical axis, and F56 is a combined focal length of the fifth lens and the sixth lens.

15. The optical lens of any of claims 1 to 6, wherein, meets at least one of the following conditional expressions: 5.2769≤TTL / F≤6.0486, 0.982≤F / H≤1.2575, 1.3822≤|F5 / F|≤4.6763, wherein TTL is a distance from an object side surface of the first lens to an imaging surface of the optical lens on the optical axis, F is a total effective focal length of the optical lens, H is an image height corresponding to a maximum field of view FOV of the optical lens, and F5 is an effective focal length of the fifth lens.

16. The optical lens of any of claims 1 to 6, wherein, satisfy at least one of the following conditional expressions: 2.3606≤R1 / R2≤2.7882, 1.6233≤|F1 / F|≤1.6491, 1.3822≤|F5 / F|≤2.8973, wherein R1 is a radius of curvature of an object side surface of the first lens, R2 is a radius of curvature of an image side surface of the first lens, F1 is an effective focal length of the first lens, F is a total effective focal length of the optical lens, and F5 is an effective focal length of the fifth lens.

17. The optical lens of any of claims 1 to 6, wherein, A radius of curvature R3 of an object side surface of the second lens and a radius of curvature R4 of an image side surface of the second lens satisfy: 0.03≤(R3-R4) / (R3+R4)≤0.

3.

18. The optical lens of any of claims 1 to 6, wherein, A radius of curvature R3 of an object side surface of the second lens and a radius of curvature R4 of an image side surface of the second lens satisfy: 0.512≤|R3 / R4|≤0.7175.

19. The optical lens of any of claims 1 to 6, wherein, A radius of curvature R3 of an object side surface of the second lens and a radius of curvature R4 of an image side surface of the second lens satisfy: 0.1277≤|(R3-R4) / (R3+R4)|≤0.3228.

20. The optical lens of any of claims 1 to 6, wherein, A radius of curvature R3 of an object side surface of the second lens and a radius of curvature R4 of an image side surface of the second lens satisfy: 0.1645≤|(R3-R4) / (R3+R4)|≤0.3228.

21. An electronic device, comprising: An imaging element for converting an optical image formed by the optical lens into an electric signal. An imaging device including the optical lens according to any one of claims 1 to 20 and the imaging element for converting an optical image formed by the optical lens into an electric signal.

Images