Optical lens and electronic equipment

Abstract

The invention discloses an optical lens and electronic equipment comprising the same. The optical lens sequentially comprises a first lens, a second lens, a third lens and a fourth lens, the second lens has negative focal power; the third lens has positive focal power; a fourth lens; a fifth lens, wherein the fifth lens has positive focal power; a sixth lens, wherein the sixth lens has negative focal power; a seventh lens, wherein the seventh lens has positive focal power; the curvature radius R3 of the object side face of the second lens and the curvature radius R4 of the image side face of the second lens meet the condition that R3 / R4 is larger than or equal to 0.512 and smaller than or equal to 0.7735. The curvature radius R13 of the object side face of the seventh lens and the curvature radius R14 of the image side face of the seventh lens meet the condition that R13 / R14 is larger than or equal to 0.4207 and smaller than or equal to 5.7963. 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. The optical lens can realize at least one of the beneficial effects of high resolution, low cost, miniaturization, small aperture, small CRA, good temperature performance and the like.

Description

[0001] This application is a divisional application of the invention patent with application date of December 2, 2019, application number 2019112117752, and invention name “Optical lens and electronic device”. Technical Field

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

[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 assisted driving systems, the application of optical lenses in automobiles has become more and more extensive. The image information collected by optical lenses can be used as important decision-making data for automobile assisted driving systems (or even autonomous driving systems). For the sake of safe driving, the market has higher and higher performance requirements for optical lenses used in automobile assisted driving systems or automobile autonomous driving systems. In this context, the imaging quality, miniaturization or temperature stability of optical lenses are becoming more and more important. Summary of the invention

[0004] One aspect of the present application provides an optical lens, which includes, 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, wherein the first lens has a negative optical power, and its object side surface is a convex surface, and its image side surface is a concave surface; the second lens has a negative optical power, and its object side surface is a concave surface, and its image side surface is a convex surface; the third lens has a positive optical power, and its object side surface is a convex surface, and its image side surface is a convex surface; the fourth lens has an optical power; the fifth lens has a positive optical power, and its object side surface is a convex surface, and its image side surface is a convex surface; the sixth lens has a negative optical power, and its object side surface is a concave surface, and its image side surface is a convex surface; and the seventh lens has a positive optical power.

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

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

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

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

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

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

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

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

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

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

[0015] In one embodiment, a distance TTL from the object side surface of the first lens to the 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 one embodiment, a distance TTL from the object side surface of the first lens to the 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 one embodiment, the maximum field of view FOV of the optical lens, the maximum light clearance D of the object side 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.

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

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

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

[0021] In one embodiment, 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.

[0022] In one 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 FOV satisfy: (FOV×F) / H≥50.

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

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

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

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

[0027] Another aspect of the present application provides an optical lens, which includes, 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, wherein the first lens has negative optical power; the second lens has negative optical power; the third lens has positive optical power; the fourth lens has optical power; the fifth lens has positive optical power; the sixth lens has negative optical power; and the seventh lens has positive optical power; wherein a curvature radius R1 of the object side surface of the first lens and a curvature radius R2 of the image side surface of the first lens satisfy: R1 / R2≤30.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0043] In one embodiment, a distance TTL from the object side surface of the first lens to the 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 one embodiment, a distance TTL from the object side surface of the first lens to the 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 one embodiment, the maximum field of view FOV of the optical lens, the maximum light clearance D of the object side 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.

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

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

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

[0049] In one embodiment, 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.

[0050] In one 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 FOV satisfy: (FOV×F) / H≥50.

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

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

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

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

[0055] According to the technical solution of the present application, the optical lens has seven lenses with optical power, and along the optical axis of the optical lens from the object side to the image side, the optical lens includes: a first lens, the first lens has 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, the second lens has 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, the third lens has positive optical power, and the object side surface of the third lens is convex; a fourth lens; a fifth lens, the fifth lens has positive optical power, the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is convex; a sixth lens, the sixth lens The lens has negative power, and the object side surface of the sixth lens is concave; the seventh lens, the seventh lens has positive 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; 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 a negative optical power and a meniscus shape, the object side surface thereof may be a convex surface, and the image side surface thereof may be a concave surface, which is conducive to collecting incident light with a large field angle, so that more light can enter the rear optical system smoothly, thereby increasing the luminous flux and improving the imaging quality of the optical system. In practical applications, the vehicle-mounted lens is generally exposed to the external environment. This meniscus lens convex to the object side is conducive to rain and snow sliding along the lens, extending the service life of the lens, and reducing the adverse effects of rain and snow on the lens imaging. The second lens may have a negative optical power, and the object side surface thereof may be a concave surface, and the image side surface may be a convex surface. This optical power and surface configuration of the second lens is conducive to the smooth entry of light into the rear optical system, improving the resolution quality of the optical system, and is conducive to collecting more incident light with a large field angle, so that it enters the rear optical system and increases the luminous flux. The third lens may have a positive optical power, and the object side surface and the image side surface may be convex surfaces at the same time. When the optical power of the third lens is positive, it is conducive to light convergence, reducing the caliber and the length of the optical lens barrel, and is conducive to miniaturization of the lens. The fourth lens may have positive focal power or negative focal power, and its object side surface may be concave, and its image side surface may be convex, or its object side surface may be convex, and its image side surface may be concave, or its object side surface and image side surface may be concave at the same time. The fourth lens is arranged in the optical system, which is beneficial to correcting the aberration generated by the front lens group, converging the light beam, increasing the lens aperture, making the optical system structure more compact, shortening the total length of the lens, and making the optical system have a relatively short overall length. The fifth lens may have positive focal power, and its object side surface and image side surface may be convex at the same time. The sixth lens may have negative focal power, and its object side surface may be concave, and its image side surface may be convex. The seventh lens may have positive focal power, and its object side surface may be convex, and its image side surface may be concave, or its object side surface may be concave, and the image side surface may be convex, or its object side surface and image side surface may be convex at the same time. The optical power and surface configuration of the seventh lens are conducive to smoothing the trend of the front light, reducing CRA, and improving the system resolution quality.

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

[0058] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of non-limiting embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0059] Figure 1 A schematic diagram showing the structure of an optical lens according to Embodiment 1 of the present application;

[0060] Figure 2 A schematic diagram showing the structure of an optical lens according to Embodiment 2 of the present application;

[0061] Figure 3 A schematic diagram showing the structure of an optical lens according to Embodiment 3 of the present application;

[0062] Figure 4 A schematic diagram showing the structure of an optical lens according to Embodiment 4 of the present application; and

[0063] Figure 5 A schematic diagram showing the structure of an optical lens according to Example 5 of the present application.

[0064] The above drawings include the following reference numerals:

[0065] 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; 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] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

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

[0074] 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.

[0075] 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).

[0076] The first lens may have negative optical power and a meniscus shape, its object side surface may be convex, and its image side surface may be concave. Such optical power and surface configuration of the first lens are conducive to collecting incident light with a large field of view angle, so that more light can smoothly enter the rear optical system, thereby increasing the light flux and improving the imaging quality of the optical system. In practical applications, vehicle-mounted lenses are generally exposed to the external environment. Such a meniscus lens convex to the object side is conducive to rain and snow sliding down the lens, extending the service life of the lens and reducing the adverse effects of rain and snow on lens imaging.

[0077] The second lens may have negative optical power, and its object side surface may be concave, while its image side surface is convex. This optical power and surface configuration of the second lens is conducive to the smooth entry of light into the rear optical system, improving the resolution quality of the optical system, and is conducive to collecting more incident light with a large field angle, allowing it to enter the rear optical system and increase the light flux.

[0078] The third lens may have positive power, and its object side and image side may be convex at the same time. When the power of the third lens is positive, it is beneficial to converge light, reduce the diameter and length of the optical lens barrel, and realize miniaturization of the lens.

[0079] The fourth lens may have positive or negative focal power, and its object side surface may be concave, and its image side surface may be convex, or its object side surface may be convex, and its image side surface may be concave, or both its object side surface and image side surface may be concave. The fourth lens is arranged in the optical system, which is beneficial to correcting the aberration produced by the front lens group, converging the light beam, increasing the lens aperture, making the optical system structure more compact, shortening the total length of the lens, and making the optical system have a relatively short overall length.

[0080] The fifth lens element may have positive refractive power, and its object-side surface and image-side surface may be convex at the same time.

[0081] The sixth lens element may have negative power, and its object-side surface may be concave, while its image-side surface may be convex.

[0082] The seventh lens may have positive power, and its object side surface may be convex, and its image side surface may be concave, or its object side surface may be concave, and its image side surface may be convex, or its object side surface and image side surface may be convex at the same time. Such power and surface configuration of the seventh lens is conducive to smoothing the forward light trend, reducing CRA, and improving the system resolution quality.

[0083] In an exemplary embodiment, an aperture for limiting the light beam may be provided between the second lens and the third lens to further improve the imaging quality of the optical lens. The aperture is conducive to effectively converging the light entering the optical system, shortening the overall length of the system, and reducing the lens aperture. In an embodiment of the present application, the aperture may be provided 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 aperture disclosed herein is only an example and not a limitation; in alternative embodiments, the aperture may also be provided at other positions according to actual needs.

[0084] 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 damage to the image-side element (e.g., chip) of the optical lens.

[0085] 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 improving the clarity of lens imaging. In addition, the use of cemented lenses can also simplify the assembly process during the lens manufacturing process.

[0086] In an exemplary embodiment, the fifth lens and the sixth lens are glued together to form a glued lens. The fifth lens with convex object side and image side and the sixth lens with concave object side and convex image side are glued together, which is not only conducive to the smooth transition of the light emitted by the fourth lens to the imaging surface, reducing the total length of the optical system, but also conducive to correcting various aberrations of the optical system, so as to improve the system resolution, optimize the optical performance such as distortion and CRA under the premise of compact structure of the optical system. The above-mentioned gluing method between lenses has at least one of the following advantages: reducing the self-chromatic aberration, reducing the tolerance sensitivity, balancing the overall chromatic aberration of the system through the residual partial chromatic aberration; reducing the air gap 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 the cost; reducing the tolerance sensitivity problems such as tilt / eccentricity of the lens unit caused by 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. This glued design shares the overall chromatic aberration correction of the system, effectively corrects aberrations to improve resolution, and makes the overall optical system compact to meet miniaturization requirements.

[0087] In an exemplary embodiment, 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: |R3 / R4|≤15, for example, |R3 / R4|≤8. The ratio of 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 is reasonably set, so that the radius of curvature of the object side surface of the lens is similar to the radius of curvature of the image side surface or the shape of the object side surface is more curved than that of the image side surface, which is conducive to correcting the aberration of the optical system and improving the image quality.

[0088] 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 and the total effective focal length F of the optical lens satisfy: TTL / F≤9, for example, TTL / F≤8. In the present application, the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis is also referred to as the total length of the optical lens. Reasonable control of the proportional relationship between the total length of the optical lens and the total effective focal length is conducive to the optical lens having better performance and realizing miniaturization of the lens.

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

[0090] In an exemplary embodiment, the maximum field of view FOV of the optical lens, the maximum aperture D of the object side of the first lens corresponding to the maximum field of view 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. Reasonable setting of the relationship between the above three factors can easily reduce the front port diameter of the optical lens and achieve miniaturization.

[0091] In an exemplary embodiment, the effective focal length F5 of the fifth lens and the effective focal length F6 of the sixth lens satisfy: 0.1≤|F5 / F6|≤1.6, for example, 0.1≤|F5 / F6|≤1.5. The ratio of the effective focal length of the fifth lens to the effective focal length of the sixth lens is reasonably set so that the focal lengths of the fifth lens and the sixth lens are similar, which is conducive to smooth transition of light and correction of system chromatic aberration.

[0092] In an exemplary embodiment, the maximum value p of the ratio of the center thickness of any two lenses on the optical axis from the first lens to the seventh lens satisfies: 2≤p≤8, for example, 3≤p≤7.2. The ratio of the center thickness of any two lenses on the optical axis from the first lens to the seventh lens is between 2 and 8 (including 2 and 8), so that the thickness between lenses in the optical lens is uniform, which is conducive to the stability of the action of each lens. In a high and low temperature changing environment, the light in the optical system changes less, so that the optical system has good temperature adaptability.

[0093] In an exemplary embodiment, 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. The ratio of 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 is reasonably set so that the radius of curvature of the object side surface and the image side surface of the lens are similar, which is conducive to the smooth entry of light into the optical system and improves the resolution quality of the system.

[0094] In an exemplary embodiment, the combined focal length F56 of the fifth lens and the sixth lens satisfies the total effective focal length F of the optical lens: 3≤|F56 / F|≤10, for example, 3≤|F56 / F|≤9.5. Reasonable setting of 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 conducive to achieving system thermal compensation.

[0095] 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 FOV satisfy: (FOV×F) / H≥50, for example, (FOV×F) / H≥55. Reasonable setting of the relationship between the above three is conducive to the optical lens having both a large field of view and a telephoto characteristic, and achieving a large angular resolution.

[0096] In an exemplary embodiment, 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 conducive 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 will not be too large, thereby reducing the tolerance sensitivity of the optical system. If the numerical limit of the above conditional expression exceeds the upper limit, the aberration of the optical system may not be fully corrected; if the numerical limit of the above conditional expression is lower than the lower limit, the incident angle of the light emitted from the first lens when incident on the object side surface of the second lens may be too large, which will increase the sensitivity of the optical system.

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

[0098] In an exemplary embodiment, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: R1 / R2≤30, for example, R1 / R2≤20. Reasonable setting of the proportional relationship between the radius of curvature of the object side surface of the first lens and the radius of curvature of the image side surface of the first lens satisfies the special shape setting of the first lens, which is conducive to improving the resolution of the optical system.

[0099] In an exemplary embodiment, the total effective focal length F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: F / H≤3, for example, F / H≤2. Reasonably setting the proportional relationship between the total effective focal length of the optical lens and the image height corresponding to the maximum field angle of the optical lens so that the above condition is satisfied is conducive to achieving the telephoto characteristics of the optical system and improving the resolution of the optical system.

[0100] In an exemplary embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy: |F1 / F|≥1, for example, 1≤|F1 / F|≤50. Reasonable setting of the proportional relationship between the effective focal length of the first lens and the total effective focal length of the optical lens is conducive to more light entering the optical system smoothly and improving the illumination of the optical system.

[0101] In an exemplary embodiment, the effective focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy: |F2 / F|≥1, for example, 1≤|F2 / F|≤95. Reasonable setting of the proportional relationship between the effective focal length of the second lens and the total effective focal length of the optical lens is conducive to balancing various aberrations in the optical system.

[0102] In an exemplary embodiment, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: |F3 / F|≥1, for example, 1≤|F3 / F|≤50. Reasonable setting of the proportional relationship between the effective focal length of the third lens and the total effective focal length of the optical lens is conducive to balancing various aberrations in the optical system.

[0103] In an exemplary embodiment, the effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens satisfy: |F4 / F|≥1, for example, 1≤|F4 / F|≤50. Reasonable setting of the proportional relationship between the effective focal length of the fourth lens and the total effective focal length of the optical lens is conducive to balancing various aberrations in the optical system.

[0104] In an exemplary embodiment, the effective focal length F5 of the fifth lens and the total effective focal length F of the optical lens satisfy: |F5 / F|≥0.05, for example, 0.05≤|F5 / F|≤50. Reasonable setting of the proportional relationship between the effective focal length of the fifth lens and the total effective focal length of the optical lens is conducive to balancing various aberrations in the optical system.

[0105] In an exemplary embodiment, 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. Reasonable setting of the proportional relationship between the effective focal length of the sixth lens and the total effective focal length of the optical lens is conducive to balancing various aberrations in the optical system.

[0106] 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: |F7 / F|≥1, for example, 1≤|F / F|≤50. Reasonable setting of the proportional relationship between the effective focal length of the seventh lens and the total effective focal length of the optical lens is conducive to balancing various aberrations in the optical system.

[0107] In an exemplary embodiment, the first lens, the fourth lens and the seventh lens are all aspherical lenses. The characteristic of an 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, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an 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 of the first lens, the fourth lens and the seventh lens is an aspherical lens, which is beneficial to improving the resolution quality of the optical system.

[0108] According to the above-mentioned embodiment of the present application, the optical lens realizes a high resolution quality of the optical system by reasonably setting the shape and focal power of each lens, while only using 7 lenses, while taking into account the low-cost requirements of small lens volume, low sensitivity, and high production yield. The optical lens also has a small CRA feature, which is beneficial for avoiding stray light generated by hitting the lens barrel when the light is emitted from the rear end of the system, and can be well matched with the on-board chip to avoid color cast and dark corners. At the same time, the optical lens also has the advantages of good temperature adaptability, small changes in imaging effects under high and low temperature environments, stable image quality, and is conducive to accurate distance measurement of binocular lenses.

[0109] 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 and improving the system resolution quality, and is also beneficial for making the overall structure of the optical system compact and meeting the miniaturization requirements.

[0110] 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.

[0111] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the lens can be changed to obtain the various results and advantages described in this specification. For example, although 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.

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

[0113] Example 1

[0114] 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.

[0115] like Figure 1 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.

[0116] The first lens L1 is a meniscus 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 meniscus 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 S6 is convex and whose image side surface S7 is convex. The fourth lens L4 is a meniscus lens with positive focal power, whose object side surface S8 is concave 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 meniscus lens with negative focal power, whose object side surface S11 is concave and whose image side surface S12 is convex. The seventh lens L7 is a meniscus lens with positive focal power, whose object side surface S13 is convex and whose image side surface S14 is concave. The fifth lens L5 and the sixth lens L6 may be cemented together to form a cemented lens.

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

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

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

[0120] Table 1 shows the radius of curvature R, thickness T (it should be understood that the thickness T of the row where S1 is located is the center thickness of the first lens L1, the thickness T of the row where S2 is located is the air space d12 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.

[0121]

[0122] Table 1

[0123] This embodiment uses seven lenses as an example. By reasonably allocating the optical power and surface shape of each lens, the center thickness of each lens, and the air space between each lens, the lens can have at least one of the beneficial effects of high resolution, miniaturization, small front aperture, small CRA, and good temperature performance. The surface shape Z of each aspherical surface is defined by the following formula:

[0124]

[0125] Wherein, Z 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 conic coefficient conic; A, B, C, D, E, and F are all high-order coefficients. Table 2 below shows the conic coefficient K and the high-order coefficients A, B, C, D, E, and F of the aspheric 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 reference Figure 2 The optical lens according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 2 A schematic structural diagram of an optical lens according to Embodiment 2 of the present application is shown.

[0130] 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.

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

[0132] 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.

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

[0134] Optionally, the optical lens may further include a filter L8 and / or a protective glass L8' having an object side surface S15 and an image side surface S16, wherein the filter L8 may be used to correct color deviation and the protective glass L8' may be used to protect the image sensor chip IMA located at the imaging surface S17. Light from the object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

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

[0136]

[0137]

[0138] Table 3

[0139] Table 4 below gives the cone coefficient K and the higher-order coefficients A, B, C, D, E and F that can be used for the aspherical lens surfaces S1, S2, S8, S9, S13 and S14 in Example 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 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.

[0144] 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.

[0145] The first lens L1 is a meniscus 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 meniscus 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 S6 is convex and whose image side surface S7 is convex. The fourth lens L4 is a meniscus lens with negative focal power, whose object side surface S8 is convex and whose image side surface S9 is concave. 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 meniscus lens with negative focal power, whose object side surface S11 is concave and whose image side surface S12 is convex. The seventh lens L7 is a meniscus lens with positive focal power, whose object side surface S13 is convex and whose image side surface S14 is concave. The fifth lens L5 and the sixth lens L6 may be cemented together to form a cemented lens.

[0146] 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 S6 of the third lens L3.

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

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

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

[0150]

[0151] Table 5

[0152] Table 6 below gives the cone coefficient K and the higher-order coefficients A, B, C, D, E and F that can be used for the aspherical lens surfaces S1, S2, S8, S9, S13 and S14 in Example 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 reference Figure 4An 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.

[0157] 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.

[0158] The first lens L1 is a meniscus 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 meniscus 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 S6 is convex and whose image side surface S7 is convex. The fourth lens L4 is a meniscus lens with negative focal power, whose object side surface S8 is concave 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 meniscus lens with negative focal power, whose object side surface S11 is concave and whose image side surface S12 is convex. The seventh lens L7 is a meniscus lens with positive focal power, whose object side surface S13 is convex and whose image side surface S14 is convex. The fifth lens L5 and the sixth lens L6 may be cemented together to form a cemented lens.

[0159] 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 S4 of the second lens L2.

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

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

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

[0163]

[0164] Table 7

[0165] Table 8 below gives the cone coefficient K and the higher-order coefficients A, B, C, D, E and F that can be used for the aspherical lens surfaces S1, S2, S8, S9, S13 and S14 in Example 4.

[0166]

[0167]

[0168] Table 8

[0169] Example 5

[0170] 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.

[0171] 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.

[0172] The first lens L1 is a meniscus 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 meniscus 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 S6 is convex and whose image side surface S7 is convex. The fourth lens L4 is a meniscus lens with negative focal power, whose object side surface S8 is concave 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 meniscus lens with negative focal power, whose object side surface S11 is concave and whose image side surface S12 is convex. The seventh lens L7 is a meniscus lens with positive focal power, whose object side surface S13 is concave and whose image side surface S14 is convex. The fifth lens L5 and the sixth lens L6 may be cemented together to form a cemented lens.

[0173] 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 S4 of the second lens L2.

[0174] In this embodiment, the object-side surfaces and the image-side surfaces of the first lens L1 , the fourth lens L4 , and the seventh lens L7 may all be aspherical surfaces.

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

[0176] Table 9 shows the curvature radius 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] Table 10 below gives the cone coefficient K and the higher-order coefficients A, B, C, D, E and F that can be used for the aspherical lens surfaces S1, S2, S8, S9, S13 and S14 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 relationship shown in Table 11 below. In Table 13, the units of F1, F2, F3, F4, F5, F6, F7, F56, TTL, H, F, D, R1, R2, R3, R4, R13, and R14 are millimeters (mm), and the unit of FOV is degrees (°).

[0184]

[0185]

[0186] Table 11

[0187] Embodiments 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), and dm(min) are millimeters (mm).

[0188] d1 to d7 respectively correspond to the center thickness of each lens of the first lens to the seventh lens on the optical axis; dn(max) is the maximum center thickness value of the center thickness of each lens of the first lens to the seventh lens on the optical axis, and dm(min) is the minimum center thickness value of the center thickness of each lens of the first lens to the seventh lens on the optical axis; max{dn:dm} is the maximum value of the ratio of the center thicknesses of any two lenses of the first lens to the seventh lens on the optical axis, that is, p mentioned above.

[0189] Conditional formula\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 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.

[0192] 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. Along the optical axis of the optical lens from the object side to the image side, the optical lens includes: a first lens, wherein the first lens has negative optical power, an object-side surface of the first lens is a convex surface, and an image-side surface of the first lens is a concave surface; a second lens, wherein the second lens has negative optical power, an object-side surface of the second lens is a concave surface, and an image-side surface of the second lens is a convex surface; A third lens, the third lens having positive optical power, and the object side surface of the third lens is a convex surface; The fourth lens; a fifth lens having positive refractive power, an object-side surface of the fifth lens being a convex surface, and an image-side surface of the fifth lens being a convex surface; a sixth lens having negative optical power, and an object-side surface of the sixth lens being a concave surface; a seventh lens having positive refractive power; The curvature radius R3 of the object side surface of the second lens is equal to the curvature radius R4 of the image side surface of the second lens. R4 satisfies: 0.512≤|R3 / R4|≤0.7735; A curvature radius R13 of the object side surface of the seventh lens and a curvature radius R14 of the image side surface of the seventh lens satisfy: 0.4207≤|R13 / R14|≤5.7963; A curvature radius R3 of the object-side surface of the second lens and a curvature radius R4 of the image-side surface of the second lens satisfy: 0.02≤(R3-R4) / (R3+R4)≤0.

4.

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

6. The optical lens according to claim 1, characterized in that: 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 a convex surface, and the image-side surface of the seventh lens is a convex surface.

7. The optical lens according to any one of claims 1 to 6, characterized in that: Satisfies at least one of the following conditional expressions: TTL / F≤9, |F / R1|≤1.5, R1 / R2≤30, |F1 / F|≥1, |F2 / F|≥1, wherein the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis is TTL, the total effective focal length of the optical lens is F, the curvature radius of the object side surface of the first lens is R1, the curvature radius of the image side surface of the first lens is R2, the effective focal length of the first lens is F1, and the effective focal length of the second lens is F2.

8. The optical lens according to any one of claims 1 to 6, characterized in that: Satisfies at least one of the following conditional expressions: TTL / F≤8, |F / R1|≤1, R1 / R2≤20, 1≤|F1 / F|≤50, 1≤|F2 / F|≤95, wherein the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis is TTL, the total effective focal length of the optical lens is F, the curvature radius of the object side surface of the first lens is R1, the curvature radius of the image side surface of the first lens is R2, the effective focal length of the first lens is F1, and the effective focal length of the second lens is F2.

9. The optical lens according to any one of claims 1 to 6, characterized in that: 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, 8.1984≤|F2 / F|≤92.5681, wherein a distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis is TTL, a total effective focal length of the optical lens is F, a curvature radius of the object side surface of the first lens is R1, a curvature radius of the image side surface of the first lens is R2, an effective focal length of the first lens is F1, and an effective focal length of the second lens is F2.

10. An electronic device, characterized in that: The invention comprises the 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