Optical lens

Abstract

The application provides an optical lens, which comprises seven lenses in sequence along an optical axis from an object side to an imaging surface, and the seven lenses comprise: a first lens with negative optical power, wherein an image side surface of the first lens is a concave surface; a second lens with positive optical power, wherein an object side surface of the second lens is a convex surface near the optical axis, and an image side surface of the second lens is a convex surface; a third lens with negative optical power, wherein an object side surface of the third lens is a concave surface, and an image side surface of the third lens is a convex surface; a fourth lens with negative optical power; a fifth lens with positive optical power, wherein an object side surface of the fifth lens is a convex surface, and an image side surface of the fifth lens is a convex surface; a sixth lens with negative optical power, wherein an object side surface of the sixth lens is a concave surface; and a seventh lens with positive optical power, wherein an image side surface of the seventh lens is a convex surface. The optical lens provided by the application has one or more advantages of good infrared confocal effect, large field of view, large aperture and miniaturization, etc. by specific surface shape matching and reasonable optical power distribution.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of imaging lenses, in particular to an optical lens. BACKGROUND

[0002] With the rapid development of science and technology, wide-angle lenses are widely used in smart home, security, vehicle-mounted and other fields due to their large field of view and wide shooting frame. Due to the difference in application environment, consumers have different requirements for the performance of the lens, but the overall requirement is getting higher and higher. In some complex application scenarios, not only is the lens required to be in focus under the condition of large temperature difference between high and low temperatures, but also is required to meet the shooting requirements in both daytime and nighttime. Therefore, the current wide-angle lens is constantly developing towards high-definition, small size and infrared co-focus, and accordingly, the new architecture of infrared co-focus lens has become an object to be developed. SUMMARY

[0003] In view of the above problems, the purpose of the present application is to provide an optical lens with the advantages of infrared co-focus and excellent imaging quality.

[0004] The technical scheme adopted by the present application is:

[0005] An optical lens, comprising seven lenses in sequence along the optical axis from the object side to the imaging surface, comprising:

[0006] a first lens with negative focal power, the image side surface of which is a concave surface;

[0007] a second lens with positive focal power, the object side surface of which is a convex surface near the optical axis, and the image side surface of which is a convex surface;

[0008] a third lens with negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface;

[0009] a fourth lens with negative focal power;

[0010] a fifth lens with positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface;

[0011] a sixth lens with negative focal power, the object side surface of which is a concave surface;

[0012] a seventh lens with positive focal power, the image side surface of which is a convex surface;

[0013] wherein the object side surface curvature radius R5 of the third lens and the image side surface curvature radius R6 of the third lens satisfy: -0.5<(R5-R6) / (R5+R6)<0.

[0014] It is further preferred that the total track length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6 < TTL / f < 7.5; the total track length TTL of the optical lens and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 3 < TTL / IH < 3.8.

[0015] It is further preferred that the maximum field of view angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 70° < FOV / Fno < 85°; the real image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 3.5 < IH / EPD < 4.5.

[0016] It is further preferred that the real image height IH corresponding to the maximum field of view angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.8 < IH / f < 2.3; the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 1.7 < BFL / f < 2.2.

[0017] It is further preferred that the object side surface aperture d1 of the first lens, the real image height IH corresponding to the maximum field of view angle of the optical lens and the maximum field of view angle FOV of the optical lens satisfy: 0.29 < d1 / (IH / 2) / tan(FOV / 2) < 0.43; the combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens and the combined focal length f567 of the fifth lens, the sixth lens and the seventh lens satisfy: -1 < f1234 / f567 < -0.6.

[0018] It is further preferred that the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -1.4 < f1 / f < -0.9; the image side surface curvature radius R2 of the first lens and the effective focal length f of the optical lens satisfy: 0.8 < R2 / f < 1.1; the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1.4 < f7 / f < 3; the image side surface curvature radius R14 of the seventh lens and the effective focal length f of the optical lens satisfy: -3.7 < R14 / f < -1.1.

[0019] It is further preferred that the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 1.65 < f2 / f < 3.3; the object side surface curvature radius R3 of the second lens and the effective focal length f of the optical lens satisfy: 10 < R3 / f < 30; the image side surface curvature radius R4 of the second lens and the effective focal length f of the optical lens satisfy: -2.2 < R4 / f < -1.1.

[0020] It is further preferred that the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -75 < f3 / f < -4.2; the object side surface curvature radius R5 of the third lens and the effective focal length f of the optical lens satisfy: -1.1 < R5 / f < -0.8; and the image side surface curvature radius R6 of the third lens and the effective focal length f of the optical lens satisfy: -2.1 < R6 / f < -1.

[0021] It is further preferred that the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 1.1 < f5 / f < 1.9; the object side surface curvature radius R9 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.1 < R9 / f < 2; and the image side surface curvature radius R10 of the fifth lens and the effective focal length f of the optical lens satisfy: -3.1 < R10 / f < -0.9.

[0022] It is further preferred that the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -2.5 < f6 / f < -1.3; the object side surface curvature radius R11 of the sixth lens and the effective focal length f of the optical lens satisfy: -3 < R11 / f < -0.8.

[0023] The optical lens provided by the application adopts seven lenses with specific focal lengths, and through specific surface shape matching and reasonable focal length distribution, the imaging quality of the optical lens is improved, the aberration is reduced, and the imaging quality of the optical lens is improved, so that the lens has one or more advantages of large field of view, large aperture, miniaturization, and the like while realizing good infrared confocal effect. BRIEF DESCRIPTION OF DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the following drawings, in which:

[0025] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0026] Figure 2 FIG. 2 is an MTF curve diagram of the optical lens according to the embodiment 1 of the present application.

[0027] Figure 3 FIG. 3 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0028] Figure 4 FIG. 4 is an MTF curve diagram of the optical lens according to the embodiment 2 of the present application.

[0029] Figure 5 FIG. 5 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0030] Figure 6The MTF curve diagram of the optical lens in Embodiment 3 of the present application.

[0031] Figure 7 The structural schematic diagram of the optical lens in Embodiment 4 of the present application.

[0032] Figure 8 The MTF curve diagram of the optical lens in Embodiment 4 of the present application.

[0033] Figure 9 The structural schematic diagram of the optical lens in Embodiment 5 of the present application.

[0034] Figure 10 The MTF curve diagram of the optical lens in Embodiment 5 of the present application.

[0035] Figure 11 The structural schematic diagram of the optical lens in Embodiment 6 of the present application.

[0036] Figure 12 The MTF curve diagram of the optical lens in Embodiment 6 of the present application.

[0037] Figure 13 The structural schematic diagram of the optical lens in Embodiment 7 of the present application.

[0038] Figure 14 The MTF curve diagram of the optical lens in Embodiment 7 of the present application.

[0039] Figure 15 The structural schematic diagram of the optical lens in Embodiment 8 of the present application.

[0040] Figure 16 The MTF curve diagram of the optical lens in Embodiment 8 of the present application.

[0041] Figure 17 The structural schematic diagram of the optical lens in Embodiment 9 of the present application.

[0042] Figure 18 The MTF curve diagram of the optical lens in Embodiment 9 of the present application.

[0043] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0044] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of embodiments of the present application and is not intended in any way to limit the scope of the present application. Throughout the description, like reference numerals refer to like elements. The expression “and / or” includes any and all combinations of one or more of the associated listed items.

[0045] It should be noted that the terms first, second, third, etc. in the present specification are used only to distinguish one feature from another, and do not denote any limitation on the features. Thus, the first lens discussed below can also be referred to as a second lens or a third lens without departing from the teachings of the present application.

[0046] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease 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.

[0047] 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 image plane is referred to as the image side surface of the lens.

[0048] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, indicate the presence of the 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. Furthermore, when describing the embodiments of the present application, the use of "may" indicates that one or more embodiments of the present application. Also, the word "exemplary" is intended to mean an example or an illustration.

[0049] 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 idealized or overly formal sense unless expressly so defined herein.

[0050] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0051] The optical lens provided by the embodiment of the present application is an infrared confocal lens, and the optical lens comprises seven lenses arranged along an optical axis from an object side to an imaging surface in sequence, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens.

[0052] In some embodiments, the first lens can have a negative focal power, the object side surface of the first lens can be a concave surface or a convex surface, and the image side surface of the first lens is a concave surface. The second lens can have a positive focal power, the object side surface of the second lens is a convex surface at a near optical axis, and the image side surface of the second lens is a convex surface. The third lens can have a negative focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface. The fourth lens can have a negative focal power, the object side surface of the fourth lens can be a concave surface or a convex surface, and the image side surface of the fourth lens can be a concave surface or a convex surface. The fifth lens can have a positive focal 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. The sixth lens can have a negative focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens can be a concave surface or a convex surface. The seventh lens can have a positive focal power, the object side surface of the seventh lens can be a concave surface or a convex surface, and the image side surface of the seventh lens is a convex surface.

[0053] In some embodiments, the optical lens can further comprise a diaphragm, and the diaphragm can be located between the fourth lens and the fifth lens. It can be understood that the diaphragm is used to limit the amount of light to change the brightness of the imaging. In addition, when the diaphragm is located between the fourth lens and the fifth lens, the diaphragm can reasonably distribute the functions of the first lens to the seventh lens, for example, the first lens, the second lens, the third lens and the fourth lens can be used to receive light to a greater extent, and the fifth lens to the seventh lens can be used to correct the function of aberration, which is conducive to balancing the structure of the entire optical system. In addition, when the diaphragm is located between the fourth lens and the fifth lens, the diaphragm aberration correction is facilitated.

[0054] In some embodiments, the optical lens can further comprise a filter and a protective glass, and the filter and the protective glass can be sequentially arranged between the seventh lens and the imaging surface along the optical axis. The filter is used to filter out interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting normal imaging. The protective glass plays a role in protecting the optical lens, preventing the photosensitive chip from being damaged, and can improve the impact resistance and scratch resistance of the optical lens, while having little effect on the imaging quality of the optical lens.

[0055] In some embodiments, the object side surface curvature radius R5 of the third lens and the image side surface curvature radius R6 of the third lens satisfy: -0.5<(R5-R6) / (R5+R6)<0. Satisfying the above range can make the third lens have a meniscus shape, which is conducive to improving the light convergence ability of the optical lens, while being able to balance various aberrations generated by the optical lens, and improve the imaging quality of the optical lens. More specifically, -0.35<(R5-R6) / (R5+R6)<-0.12.

[0056] In some embodiments, the total track length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6 < TTL / f < 7.5. Satisfying the above range can effectively limit the length of the lens, which is conducive to the miniaturization of the optical lens. More specifically, 6.52 < TTL / f < 7.25.

[0057] In some embodiments, the total track length TTL of the optical lens and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 3 < TTL / IH < 3.8. Satisfying the above range ensures that the lens has a larger image surface under the condition of the same total length, which can match a larger size imaging chip to realize high-definition imaging, and better realize the balance between the small total length and the large image surface of the lens. More specifically, 3.19 < TTL / IH < 3.5.

[0058] In some embodiments, the maximum field of view angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 70° < FOV / Fno < 85°. Satisfying the above range limits the optical lens to have a suitable field of view angle and aperture value, which can collect light rays of a large angle and obtain good imaging quality. More specifically, 71.18° < FOV / Fno < 80.01°.

[0059] In some embodiments, the real image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 3.5 < IH / EPD < 4.5. Satisfying the above range can increase the width of the light ray bundle entering the optical lens, so that the brightness of the optical lens at the image surface is improved to avoid dark corners. More specifically, 3.7 < IH / EPD < 4.26.

[0060] In some embodiments, the real image height IH corresponding to the maximum field of view angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.8 < IH / f < 2.3. Satisfying the above range controls the image height and the focal length of the optical lens within a reasonable range, which is helpful for the optical lens to have a large image surface and improve the imaging quality. More specifically, 1.94 < IH / f < 2.14.

[0061] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 1.7 < BFL / f < 2.2. Satisfying the above range limits the optical lens to have a suitable back focus, which facilitates the reasonable arrangement of the positions of the lenses and reduces the difficulty of processing and assembly. More specifically, 1.87 < BFL / f < 2.02.

[0062] In some embodiments, the first lens has a back focal length BFL1, the optical lens has a maximum field of view FOV, and the optical lens has an effective focal length f, and the following relationship is satisfied: 0.29 < d1 / (IH / 2) / tan(FOV / 2) < 0.43, where d1 is a light entrance aperture of an object side of the first lens, IH is a real image height corresponding to the maximum field of view of the optical lens, and tan(FOV / 2) is a tangent of half of the maximum field of view of the optical lens. Satisfying the above range can satisfy the optical lens having a large field of view and a large image surface while having a small front aperture.

[0063] In some embodiments, the first lens, the second lens, the third lens, and the fourth lens have a combined focal length f1234, the fifth lens, the sixth lens, and the seventh lens have a combined focal length f567, and the following relationship is satisfied: -1 < f1234 / f567 < -0.6. Satisfying the above range can balance various aberrations generated by the lens group in front of the stop by reasonably setting the focal lengths of the lens groups before and after the stop, and improve the overall imaging quality. More specifically, -0.91 < f1234 / f567 < -0.68.

[0064] In some embodiments, the optical lens has an effective focal length f, the first lens has a focal length f1, and the following relationship is satisfied: -1.4 < f1 / f < -0.9. The first lens has an image side surface with a curvature radius R2, and the optical lens has an effective focal length f, and the following relationship is satisfied: 0.8 < R2 / f < 1.1. Satisfying the above range can help the first lens to accommodate more light rays and collect as much light as possible into the rear optical system by setting the first lens to have negative refractive power and the image side surface to be concave, thereby achieving a large field of view while increasing the light flux. More specifically, -1.29 < f1 / f < -1.01, and 0.84 < R2 / f < 1.04.

[0065] In some embodiments, the optical lens has an effective focal length f, the seventh lens has a focal length f7, and the following relationship is satisfied: 1.4 < f7 / f < 3. The seventh lens has an image side surface with a curvature radius R14, and the optical lens has an effective focal length f, and the following relationship is satisfied: -3.7 < R14 / f < -1.1. Satisfying the above range can help the light rays to converge and smoothly transition to the rear by setting the seventh lens to have positive refractive power and a suitable surface shape, thereby reducing the height of the light rays incident to the rear, avoiding light energy loss caused by the large field of view light reaching the imaging surface and the main light ray angle of the chip being too large, improving the illumination of the edge field of view, and achieving a short total optical length. More specifically, 1.57 < f7 / f < 2.78, and -3.36 < R14 / f < -1.25.

[0066] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 1.65 < f2 / f < 3.3; the object-side surface curvature radius R3 of the second lens and the effective focal length f of the optical lens satisfy: 10 < R3 / f < 30; the image-side surface curvature radius R4 of the second lens and the effective focal length f of the optical lens satisfy: -2.2 < R4 / f < -1.1; the object-side surface curvature radius R3 of the second lens and the image-side surface curvature radius R4 of the second lens satisfy: 0.6 < (R3-R4) / (R3+R4) < 1. Satisfying the above ranges, the second lens is limited to have appropriate positive refractive power and suitable surface shape, has the effect of converging light rays, and reduces the height of peripheral light rays, which is beneficial to the reduction of the aperture of the rear lens. More specifically, 1.79 < f2 / f < 2.99; 10.83 < R3 / f < 29.87; -2.06 < R4 / f < -1.19; 0.76 < (R3-R4) / (R3+R4) < 0.93.

[0067] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -75 < f3 / f < -4.2; the object-side surface curvature radius R5 of the third lens and the effective focal length f of the optical lens satisfy: -1.1 < R5 / f < -0.8; the image-side surface curvature radius R6 of the third lens and the effective focal length f of the optical lens satisfy: -2.1 < R6 / f < -1. Satisfying the above ranges, the third lens has negative refractive power and suitable surface shape, has the effect of diverging light rays, can disperse the central light rays and the edge light rays of each field of view, and can correct the aberration generated by the front lens. More specifically, -74.51 < f3 / f < -4.6; -1.05 < R5 / f < -0.85; -1.96 < R6 / f < -1.1.

[0068] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 1.1 < f5 / f < 1.9; the object-side surface curvature radius R9 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.1 < R9 / f < 2; the image-side surface curvature radius R10 of the fifth lens and the effective focal length f of the optical lens satisfy: -3.1 < R10 / f < -0.9; the object-side surface curvature radius R9 of the fifth lens and the image-side surface curvature radius R10 of the fifth lens satisfy: |(R9+R10) / (R9-R10)| < 0.5. Satisfying the above ranges, the fifth lens is set to have positive refractive power and suitable surface shape, which is beneficial to converging light rays while correcting the field curvature and distortion of the optical lens, and improves the imaging quality of the optical lens. More specifically, 1.18 < f5 / f < 1.74; 1.22 < R9 / f < 1.84; -2.89 < R10 / f < -0.95; -0.41 < (R9+R10) / (R9-R10) < 0.31.

[0069] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -2.5 < f6 / f < -1.3; the object side curvature radius R11 of the sixth lens and the effective focal length f of the optical lens satisfy: -3 < R11 / f < -0.8. By satisfying the above ranges, the sixth lens is provided with negative refractive power and a suitable surface shape, which is beneficial to increasing the divergence degree of light, increasing the area of light entering the imaging surface, realizing large target surface imaging of the lens, and improving the imaging quality of the optical lens. More specifically, -2.34 < f6 / f < -1.41; -2.77 < R11 / f < -0.86.

[0070] In some embodiments, the total length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis satisfy: 0.49 < ∑CT / TTL < 0.58. By satisfying the above range, the total length of the optical lens can be effectively compressed, and the structure design and production process of the optical lens are facilitated.

[0071] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis and the effective focal length f of the optical lens satisfy: 3.51 < ∑CT / f < 3.87. By satisfying the above range, the field curvature and distortion of the optical lens can be effectively corrected, and the imaging quality of the optical lens is improved.

[0072] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -12 < f4 / f < -2.6. By satisfying the above range, the fourth lens is limited to have appropriate negative refractive power, and the light is diverged so that the light of the edge field has an upward trend, which is beneficial to the image points on the imaging surface away from the optical axis, so as to realize the effect of matching with a large chip, obtain a larger picture, effectively eliminate aberration, and improve the resolving power of the optical lens. More specifically, -10.99 < f4 / f < -2.8.

[0073] In some embodiments, the optical lens satisfies the following conditional expressions: 3.9mm < f < 4.1mm; 1.9mm < EPD < 2.2mm; 25mm < TTL < 30mm; 1.8 < Fno < 2.1; 12° < CRA < 15°; 7mm < BFL < 8.5mm; 130° < FOV < 160°; 7.5mm < IH < 9mm. In the above conditional expressions, f represents the effective focal length of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, Fno represents the aperture value of the optical lens, CRA represents the chief ray angle of incidence of the optical lens, BFL represents the back focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, and IH represents the real image height corresponding to the maximum field of view angle of the optical lens. When the above ranges are satisfied, the optical lens has one or more advantages such as a large field of view angle, a large image surface, a large aperture, and the like. More specifically, 3.98mm < f < 4.04mm; 1.99mm < EPD < 2.13mm; 26.27mm < TTL < 28.92mm; 1.89 < Fno < 2.01; 12.77° < CRA < 14.03°; 7.54mm < BFL < 8.08mm; 139° < FOV < 153°; 7.84mm < IH < 8.5mm.

[0074] In some embodiments, the lens material in the optical lens provided by the present application can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected due to the low dispersion characteristic of the glass itself. The optical lens of the present application adopts a seven-piece glass-plastic hybrid lens structure, which can improve the thermal stability. Specifically, the first lens and the fourth lens are glass lenses; the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens are plastic lenses; the glass-plastic hybrid structure can effectively reduce the cost, correct the aberration, reduce the size, and provide an optical lens product with higher cost performance.

[0075] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can adopt a spherical lens or an aspherical lens. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving lens miniaturization. More specifically, in the optical lens provided by the present application, the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens can adopt an aspherical lens, and the first lens and the fourth lens can adopt a spherical lens.

[0076] In various embodiments of the present application, when the lens adopts an aspherical lens, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0077]

[0078] wherein z is the distance of the curved surface to the vertex of the curved surface in the direction of the optical axis, h is the distance of the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the coefficient of the quadratic curved surface, and B, C, D, E, and F are the coefficients of the fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order curved surfaces, respectively.

[0079] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are merely the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, and any change, substitution, combination, or simplification made without departing from the innovative points of the application should be regarded as equivalent replacement, and all are included in the protection scope of the application.

[0080] Embodiment 1

[0081] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens 100 provided in the embodiment 1 of the application. The optical lens 100 includes, in sequence from the object side to the imaging surface along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a stop ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0082] The first lens L1 has a negative focal power, the object side surface S1 thereof is a concave surface, and the image side surface S2 thereof is a concave surface.

[0083] The second lens L2 has a positive focal power, the object side surface S3 thereof is a convex surface near the optical axis, and the image side surface S4 thereof is a convex surface.

[0084] The third lens L3 has a negative focal power, the object side surface S5 thereof is a concave surface, and the image side surface S6 thereof is a convex surface.

[0085] The fourth lens L4 has a negative focal power, the object side surface S7 thereof is a concave surface, and the image side surface S8 thereof is a convex surface.

[0086] The fifth lens L5 has a positive focal power, the object side surface S9 thereof is a convex surface, and the image side surface S10 thereof is a convex surface.

[0087] The sixth lens L6 has a negative focal power, the object side surface S11 thereof is a concave surface, and the image side surface S12 thereof is a concave surface.

[0088] The seventh lens L7 has a positive focal power, the object side surface S13 thereof is a convex surface, and the image side surface S14 thereof is a convex surface.

[0089] The object side surface S15 and the image side surface S16 of the filter G1 are both flat surfaces.

[0090] The object side S17 and the image side S18 of the protective glass G2 are both planar;

[0091] The imaging surface S19 is planar.

[0092] The second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are plastic aspherical lenses; the first lens L1 and the fourth lens L4 are glass spherical lenses.

[0093] The related parameters of the lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0094] Table 1-1

[0095]

[0096]

[0097] The surface type parameters of the aspherical lenses of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0098] Table 1-2

[0099] Face number K B C D E F S3 -4.50E+01 -3.81E-03 -2.52E-04 -2.00E-06 9.04E-07 -7.04E-08 S4 2.71E-01 2.63E-04 -1.18E-04 7.08E-06 -5.19E-07 1.34E-08 S5 -4.26E+00 5.46E-03 -4.13E-04 2.85E-05 -2.16E-06 6.28E-08 S6 -5.62E+00 2.09E-03 -3.34E-04 9.14E-06 -2.34E-07 3.92E-09 S9 -7.76E-01 -5.09E-05 -1.32E-04 1.36E-05 -5.80E-07 -4.87E-09 S10 -1.85E+00 -3.23E-03 3.37E-04 -2.57E-05 8.72E-07 -2.42E-08 S11 -1.43E+01 -4.08E-03 2.93E-04 -2.77E-05 7.95E-07 -1.49E-08 S12 8.65E+00 4.58E-04 -2.25E-05 3.47E-07 -4.98E-07 1.18E-08 S13 -6.74E+00 1.04E-03 4.95E-05 3.59E-06 -3.11E-07 9.19E-09 S14 -3.00E+00 -4.87E-04 1.60E-05 8.27E-06 -4.04E-07 2.70E-08

[0100] In this embodiment, the MTF curve of the optical lens 100 is shown in Figure 2 . Figure 2 The MTF (Modulation Transfer Function) curve of Embodiment 1 is shown, which represents the lens imaging modulation degree of different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of this embodiment is above 0.48 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0101] Embodiment 2

[0102] Please refer to Figure 3 , which is a structural schematic diagram of the optical lens 200 provided in Embodiment 2 of the application. Compared with Embodiment 1, the main difference is that the object side S1 of the first lens L1 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0103] The related parameters of the lenses in the optical lens 200 in Embodiment 2 are shown in Table 2-1.

[0104] Table 2-1

[0105]

[0106] The surface profile parameters of the aspherical lenses of the optical lens 200 in Embodiment 2 are shown in Table 2-2.

[0107] Table 2-2

[0108] Face number K B C D E F S3 -4.29E+01 -3.56E-03 -1.61E-04 -8.63E-06 7.01E-07 -5.21E-08 S4 -2.83E-01 6.37E-04 -1.58E-04 1.14E-05 -7.68E-07 1.67E-08 S5 -4.16E+00 3.13E-03 -2.93E-04 3.45E-05 -2.61E-06 8.07E-08 S6 -3.78E+00 -6.21E-04 -1.62E-04 9.66E-06 -4.00E-07 1.09E-08 S9 -2.78E+00 -5.02E-04 -2.17E-05 -2.89E-06 5.10E-07 -6.62E-08 S10 5.10E+00 -6.28E-03 5.16E-04 -3.20E-05 1.04E-06 -3.21E-08 S11 -2.16E+01 -4.34E-03 1.31E-04 -8.09E-06 2.81E-07 -1.93E-08 S12 2.13E+00 1.01E-04 -1.78E-04 8.53E-06 -2.57E-07 -3.78E-09 S13 -5.46E+00 4.38E-04 -1.71E-05 4.46E-06 -1.00E-07 2.31E-09 S14 -9.35E-01 -3.09E-04 6.35E-06 6.89E-06 -4.10E-07 2.01E-08

[0109] In this embodiment, the MTF curve of the optical lens 200 is shown in Figure 4 From Figure 4 it can be seen that the MTF value of this embodiment is above 0.5 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low and high frequency cases.

[0110] Embodiment 3

[0111] Please refer to Figure 5 , which is a structural schematic diagram of the optical lens 300 provided in Embodiment 3 of the present application. Compared with Embodiment 1, the main difference is that: the object side S7 of the fourth lens L4 is a convex surface; the image side S8 of the fourth lens L4 is a concave surface; the image side S12 of the sixth lens L6 is a convex surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0112] The related parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3-1.

[0113] Table 3-1

[0114]

[0115] The surface profile parameters of the aspherical lenses of the optical lens 300 in Embodiment 3 are shown in Table 3-2.

[0116] Table 3-2

[0117]

[0118]

[0119] In this embodiment, the MTF curve of the optical lens 300 is shown in Figure 6 From Figure 6 it can be seen that the MTF value of this embodiment is above 0.48 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low and high frequency cases.

[0120] Embodiment 4

[0121] Please see Figure 7 The figure shows a schematic diagram of the structure of the optical lens 400 provided in Embodiment 4 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object side S1 of the first lens L1 is a convex surface; the object side S7 of the fourth lens L4 is a convex surface; the image side S8 of the fourth lens L4 is a concave surface; the image side S12 of the sixth lens L6 is a convex surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0122] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0123] Table 4-1

[0124]

[0125]

[0126] The surface profile parameters of the aspherical lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0127] Table 4-2

[0128] Face number K B C D E F S3 -4.42E+01 -3.29E-03 -3.81E-04 6.91E-06 -4.29E-06 2.70E-07 S4 -3.73E-01 7.26E-04 -2.72E-04 1.37E-05 -9.53E-07 4.35E-08 S5 -3.80E+00 4.31E-03 -1.10E-04 3.48E-05 -2.42E-06 5.18E-08 S6 -5.51E+00 2.67E-03 -2.78E-04 2.88E-05 -1.50E-06 4.93E-08 S9 1.26E+00 3.79E-03 -8.69E-04 8.40E-05 -5.08E-06 8.82E-08 S10 -8.23E+00 -4.09E-03 3.12E-04 -3.36E-05 2.96E-06 -1.54E-07 S11 -5.56E+00 -2.65E-03 1.60E-04 -9.87E-06 -1.94E-07 9.72E-08 S12 -4.50E+01 3.51E-03 -1.53E-04 -6.11E-06 9.88E-07 -1.97E-08 S13 -2.11E+01 1.00E-03 -5.58E-06 -5.63E-06 4.89E-07 -1.07E-08 S14 -7.22E-01 -6.68E-05 3.11E-05 2.45E-07 -6.81E-08 5.71E-09

[0129] In this embodiment, the MTF curve of the optical lens 400 is as follows: Figure 8 As shown. From Figure 8 As can be seen, the MTF value of this embodiment is above 0.5 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0130] Example 5

[0131] Please see Figure 9 The figure shows a schematic diagram of the structure of the optical lens 500 provided in Embodiment 5 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object side S7 of the fourth lens L4 is a convex surface; the image side S8 of the fourth lens L4 is a concave surface; the image side S12 of the sixth lens L6 is a convex surface; the object side S13 of the seventh lens L7 is a concave surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0132] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0133] Table 5-1

[0134]

[0135]

[0136] The surface profile parameters of the aspherical lenses of the optical lens 500 in Embodiment 5 are shown in Table 5-2.

[0137] Table 5-2

[0138] Face number K B C D E F S3 -4.50E+01 -8.61E-04 -2.23E-04 1.02E-05 -3.54E-06 1.76E-07 S4 -1.93E-01 9.19E-04 -1.79E-04 9.10E-06 -5.33E-07 2.12E-08 S5 -2.55E+00 5.14E-03 -1.99E-04 3.47E-05 -1.84E-06 3.20E-08 S6 -1.25E+00 4.70E-03 -1.48E-04 1.55E-05 -1.01E-06 3.77E-08 S9 -5.29E-01 1.78E-03 -3.58E-04 2.68E-05 -1.15E-06 1.73E-08 S10 -4.96E+00 -3.46E-03 4.33E-04 -5.48E-05 4.40E-06 -1.61E-07 S11 -9.89E+00 5.08E-03 -1.28E-04 -3.30E-05 4.52E-06 -1.97E-07 S12 -4.50E+01 9.41E-03 -2.41E-04 -1.58E-05 1.88E-06 -8.24E-08 S13 -4.50E+01 1.08E-03 1.50E-04 -1.44E-05 7.78E-07 -1.67E-08 S14 3.58E-01 1.16E-03 3.84E-05 3.51E-06 -2.80E-07 1.98E-08

[0139] In this embodiment, the MTF curve of the optical lens 500 is shown in Figure 10 From Figure 10 it can be seen that the MTF value of this embodiment is above 0.5 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low and high frequency cases.

[0140] Embodiment 6

[0141] Please refer to Figure 11 , which is a structural schematic diagram of the optical lens 600 provided in Embodiment 6 of the present application. Compared with Embodiment 1, the main difference is that: the object side S1 of the first lens L1 is a convex surface; the object side S7 of the fourth lens L4 is a convex surface; the image side S8 of the fourth lens L4 is a concave surface; the image side S12 of the sixth lens L6 is a convex surface; the object side S13 of the seventh lens L7 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0142] The related parameters of each lens in the optical lens 600 in Embodiment 6 are shown in Table 6-1.

[0143] Table 6-1

[0144]

[0145]

[0146] The surface profile parameters of the aspherical lenses of the optical lens 600 in Embodiment 6 are shown in Table 6-2.

[0147] Table 6-2

[0148] Face number K B C D E F S3 -4.50E+01 -2.20E-03 -2.47E-04 1.25E-05 -3.37E-06 1.88E-07 S4 8.87E-01 -9.25E-05 -1.36E-04 1.31E-05 -6.27E-07 2.02E-08 S5 -3.33E+00 5.63E-03 -2.14E-04 3.44E-05 -1.87E-06 3.39E-08 S6 -6.98E+00 5.00E-03 -1.60E-04 2.32E-05 -1.76E-06 9.83E-08 S9 -1.33E+00 1.45E-03 -4.25E-04 3.44E-05 -1.82E-06 4.75E-08 S10 -4.91E+00 -4.44E-03 4.41E-04 -5.19E-05 3.56E-06 -1.17E-07 S11 -7.97E+00 5.11E-03 -1.06E-04 -2.68E-05 3.91E-06 -1.71E-07 S12 -4.50E+01 9.62E-03 -2.63E-04 -1.28E-05 2.51E-06 -1.30E-07 S13 4.50E+01 2.04E-04 1.48E-04 -1.60E-05 9.83E-07 -2.70E-08 S14 4.85E-01 7.28E-04 1.65E-05 2.20E-06 -1.99E-07 1.02E-08

[0149] In this embodiment, the MTF curve of the optical lens 600 is shown in Figure 12 From Figure 12As can be seen, the MTF value of this embodiment is above 0.48 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0150] Example 7

[0151] Please see Figure 13 The figure shows a schematic diagram of the structure of the optical lens 700 provided in Embodiment 7 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object side surface S1 of the first lens L1 is convex; the object side surface S7 of the fourth lens L4 is convex; the image side surface S8 of the fourth lens L4 is concave; the object side surface S13 of the seventh lens L7 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0152] The relevant parameters of each lens in the optical lens 700 in Example 7 are shown in Table 7-1.

[0153] Table 7-1

[0154]

[0155] The surface profile parameters of the aspherical lens of the optical lens 700 in Example 7 are shown in Table 7-2.

[0156] Table 7-2

[0157]

[0158]

[0159] In this embodiment, the MTF curve of the optical lens 700 is as follows: Figure 14 As shown. From Figure 14 As can be seen, the MTF value of this embodiment is above 0.48 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0160] Example 8

[0161] Please see Figure 15 The figure shows a schematic diagram of the structure of the optical lens 800 provided in Embodiment 8 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object side S7 of the fourth lens L4 is a convex surface; the image side S8 of the fourth lens L4 is a concave surface; the object side S13 of the seventh lens L7 is a concave surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0162] The related parameters of the lenses in the optical lens 800 in Embodiment 8 are shown in Table 8-1.

[0163] Table 8-1

[0164]

[0165] The surface type parameters of the aspheric lenses of the optical lens 800 in Embodiment 8 are shown in Table 8-2.

[0166] Table 8-2

[0167] Face number K B C D E F S3 4.50E+01 -5.99E-04 -2.21E-04 8.84E-06 -3.53E-06 1.75E-07 S4 -2.30E+00 9.01E-04 -2.11E-04 6.88E-06 -2.76E-07 1.20E-08 S5 -2.89E+00 4.88E-03 -1.80E-04 3.48E-05 -1.92E-06 3.51E-08 S6 -2.28E+00 4.51E-03 -1.66E-04 2.01E-05 -1.26E-06 4.36E-08 S9 -1.28E+00 1.78E-03 -3.24E-04 2.57E-05 -1.02E-06 1.15E-08 S10 -4.85E+00 -3.53E-03 4.21E-04 -5.22E-05 4.08E-06 -1.41E-07 S11 -1.64E+01 5.45E-03 -1.57E-04 -2.98E-05 3.68E-06 -1.51E-07 S12 4.50E+01 8.59E-03 -1.09E-04 -2.69E-05 1.71E-06 -4.80E-08 S13 -2.34E+01 1.34E-03 1.62E-04 -1.50E-05 6.98E-07 -1.42E-08 S14 1.96E-01 1.18E-03 3.57E-05 2.14E-06 -1.78E-07 1.31E-08

[0168] In this embodiment, the MTF curve of the optical lens 800 is shown in Figure 16 . It can be seen from Figure 16 that the MTF value of this embodiment is above 0.5 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0169] Embodiment 9

[0170] Please refer to Figure 17 , which is a structural schematic diagram of the optical lens 900 provided in Embodiment 9 of the present application. Compared with Embodiment 1, the main difference is that: the image side surface S8 of the fourth lens L4 is a concave surface; the object side surface S13 of the seventh lens L7 is a concave surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0171] The related parameters of the lenses in the optical lens 900 in Embodiment 9 are shown in Table 9-1.

[0172] Table 9-1

[0173]

[0174]

[0175] The surface type parameters of the aspheric lenses of the optical lens 900 in Embodiment 9 are shown in Table 9-2.

[0176] Table 9-2

[0177] Face number K B C D E F S3 4.50E+01 -8.71E-04 -1.38E-04 6.68E-06 -1.63E-06 5.33E-08 S4 -1.77E+00 1.70E-03 -3.41E-04 2.49E-05 -1.24E-06 2.44E-08 S5 -2.92E+00 3.42E-03 -3.47E-04 3.86E-05 -1.72E-06 2.09E-08 S6 -3.80E+00 2.85E-03 -3.49E-04 3.13E-05 -1.72E-06 3.36E-08 S9 2.00E+00 4.14E-03 -8.00E-04 7.66E-05 -4.68E-06 5.25E-08 S10 -5.95E+00 -3.70E-03 3.70E-04 -3.62E-05 2.65E-06 -1.48E-07 S11 -4.13E+01 -3.09E-03 2.86E-05 2.63E-06 -4.10E-07 7.97E-08 S12 -1.74E+01 8.00E-04 -9.87E-05 1.86E-06 6.20E-07 -4.28E-09 S13 -4.50E+01 1.87E-03 1.48E-06 -8.29E-06 7.67E-07 -1.76E-08 S14 -8.04E-01 5.71E-04 -1.40E-05 4.38E-06 -2.10E-07 1.06E-08

[0178] In this embodiment, the MTF curve of the optical lens 900 is shown in Figure 18 . It can be seen from Figure 18As can be seen, the MTF value of the embodiment is above 0.3 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution in the case of low frequency and high frequency.

[0179] Referring to Table 10, the optical characteristics corresponding to the above-mentioned embodiments are shown, including the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view, the maximum field of view FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0180] Table 10

[0181]

[0182]

[0183] In summary, the optical lens provided by the present application adopts seven lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages of large field of view, large aperture, miniaturization, etc. while achieving good infrared confocal effect.

[0184] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0185] The above-described embodiments only express several embodiments of the present application, which are described in a more specific and detailed manner, but should not be understood as limiting the scope of the present patent. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within the scope of protection of the present application. Therefore, the scope of protection of the present patent should be subject to the appended claims.

Claims

1. An optical lens, in total seven pieces of lenses, characterized in that, In order from the object side to the imaging plane along the optical axis, successively comprises: a first lens with negative refractive power, the image side surface of which is a concave surface; a second lens with positive refractive power, the object side surface of which is a convex surface near the optical axis, and the image side surface of which is a convex surface; a third lens with negative refractive power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a fourth lens with negative refractive power; a fifth lens with positive refractive power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface; a sixth lens with negative refractive power, the object side surface of which is a concave surface; a seventh lens with positive refractive power, the image side surface of which is a convex surface; wherein the object side surface curvature radius R5 of the third lens and the image side surface curvature radius R6 of the third lens satisfy: -0.5<(R5-R6) / (R5+R6)<0; and the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6<TTL / f<7.

5.

2. The optical lens of claim 1, wherein, The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.52<TTL / f<7.25; the object side surface curvature radius R5 of the third lens and the image side surface curvature radius R6 of the third lens satisfy: -0.35<(R5-R6) / (R5+R6)<-0.12; and the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 3<TTL / IH<3.

8.

3. The optical lens of claim 1, wherein, The maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 70°<FOV / Fno<85°; and the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 3.5<IH / EPD<4.

5.

4. The optical lens of claim 1, wherein, The real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.8<IH / f<2.3; and the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 1.7<BFL / f<2.

2.

5. The optical lens of claim 1, wherein, The object side surface aperture d1 of the first lens, the real image height IH corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 0.29<d1 / (IH / 2) / tan(FOV / 2)<0.43; and the combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens and the combined focal length f567 of the fifth lens, the sixth lens and the seventh lens satisfy: -1<f1234 / f567<-0.

6.

6. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -1.4<f1 / f<-0.9; the image side surface curvature radius R2 of the first lens and the effective focal length f of the optical lens satisfy: 0.8<R2 / f<1.1; the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1.4<f7 / f<3; and the image side surface curvature radius R14 of the seventh lens and the effective focal length f of the optical lens satisfy: -3.7<R14 / f<-1.

1.

7. The optical lens of claim 1, wherein, An effective focal length f of the optical lens and a focal length f2 of the second lens satisfy: 1.65 < f2 / f < 3.3; a radius of curvature R3 of an object side surface of the second lens and the effective focal length f of the optical lens satisfy: 10 < R3 / f < 30; a radius of curvature R4 of an image side surface of the second lens and the effective focal length f of the optical lens satisfy: -2.2 < R4 / f < -1.

1.

8. The optical lens of claim 1, wherein, An effective focal length f of the optical lens and a focal length f3 of the third lens satisfy: -75 < f3 / f < -4.2; a radius of curvature R5 of an object side surface of the third lens and the effective focal length f of the optical lens satisfy: -1.1 < R5 / f < -0.8; a radius of curvature R6 of an image side surface of the third lens and the effective focal length f of the optical lens satisfy: -2.1 < R6 / f < -1.

9. The optical lens of claim 1, wherein, An effective focal length f of the optical lens and a focal length f5 of the fifth lens satisfy: 1.1 < f5 / f < 1.9; a radius of curvature R9 of an object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 1.1 < R9 / f < 2; a radius of curvature R10 of an image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: -3.1 < R10 / f < -0.

9.

10. The optical lens of claim 1, wherein, An effective focal length f of the optical lens and a focal length f6 of the sixth lens satisfy: -2.5 < f6 / f < -1.3; a radius of curvature R11 of an object side surface of the sixth lens and the effective focal length f of the optical lens satisfy: -3 < R11 / f < -0.8.

Images