Optical lens

Abstract

The utility model relates to an optical lens, which sequentially comprises a first lens, a second lens, a third lens and a fourth lens along the optical axis from the object side to the image side, a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power, a seventh lens with negative focal power and an eighth lens with negative focal power are included. The combined effective focal length of the first lens and the second lens is F12, and the Abbe number Vd1 of the first lens and the Abbe number Vd2 of the second lens meet the following relation: F12 / (Vd1-Vd2) is greater than or equal to 1 and less than or equal to 4.85. The optical lens at least has one of the characteristics of large field of view, miniaturization, large target surface, high resolution, low distortion and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of imaging lenses, and in particular to an optical lens with one of the characteristics of large field of view, miniaturization, large target surface, high resolution, and low distortion. Background Art

[0002] Video lenses are widely used in fields such as video conferencing, security monitoring, and sports photography.

[0003] Meanwhile, with the development of information technology, the application of video conferencing in the remote communication management of enterprises has become very extensive. In video conferencing, the imaging optical system for photography is a very important component, and the performance of the imaging optical system has an obvious impact on the use effect of video conferencing.

[0004] The optical lenses on the current market still have the following deficiencies:

[0005] 1. The frame sizes of existing optical lenses are generally small and cannot meet the requirements of the mainstream large target surface.

[0006] 2. It is difficult for the frame sizes of existing optical lenses to maintain low distortion under the condition of ensuring high resolution.

[0007] 3. To achieve a large target surface, low distortion, and high resolution, existing optical lenses generally need to increase the number of lenses to balance the system performance. At this time, the lens may have problems such as too long total length and too large volume.

[0008] Therefore, designing an optical lens with one of the characteristics of large field of view, low distortion, low cost, miniaturization, large target surface, and high resolution has become the development trend of the market. Summary of the Utility Model

[0009] To solve the problems existing in the above-mentioned prior art, the purpose of the utility model is to provide an optical lens having at least one of the characteristics of a large field of view FOV>61°, optical distortion ≤ |-2.6%|, low cost, miniaturization, large target surface, and high resolution.

[0010] To achieve the above-mentioned utility model purpose, the utility model provides an optical lens. Along the direction of the optical axis from the object side to the image side, there are a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, and an eighth lens with negative optical power.

[0011] The combined effective focal length F12 of the first lens and the second lens, the Abbe number Vd1 of the first lens, and the Abbe number Vd2 of the second lens satisfy the following relationship: 1 ≤ F12 / (Vd1 - Vd2) ≤ 4.85.

[0012] According to a technical solution of the present invention, the first lens is a convex-convex lens, the second lens is a convex-concave lens, the third lens is a concave-convex lens, and the fourth lens is a convex-convex lens.

[0013] According to a technical solution of the present invention, the fifth lens is a concave-convex lens, the sixth lens is a convex-convex lens, the image side of the seventh lens is concave, and the eighth lens is a concave-concave lens.

[0014] According to a technical solution of the present invention, the first lens and the second lens form a doublet lens.

[0015] According to a technical solution of the present invention, the first lens, the second lens, the third lens, the aperture stop, and the fourth lens form an internal focusing structure.

[0016] According to a technical solution of the present invention, the combined effective focal length F12 of the first lens and the second lens and the effective focal length F of the optical lens satisfy the following relationship: 3.95 ≤ F12 / F ≤ 9.6.

[0017] According to a technical solution of the present invention, the effective focal length F1 of the first lens and the effective focal length F2 of the second lens satisfy the following relationship: -2 ≤ F2 / F1 ≤ -1.1.

[0018] According to a technical solution of the present invention, the radius of curvature R31 of the object side of the third lens, the radius of curvature R32 of the image side of the third lens, and the effective focal length F of the optical lens satisfy the following relationship: 0.6 ≤ (F / R31) + (F / R32) ≤ 1.2.

[0019] According to a technical solution of the present invention, the effective focal length F4 of the fourth lens and the effective focal length F of the optical lens satisfy the following relationship: 0.9 ≤ F4 / F ≤ 1.46.

[0020] According to a technical solution of the present invention, the radius of curvature R51 of the object side of the fifth lens, the radius of curvature R52 of the image side of the fifth lens, and the effective focal length F5 of the fifth lens satisfy the following relationship: -2.94 ≤ F5 / (R51 + R52) ≤ -1.68.

[0021] According to a technical solution of the present invention, the effective focal length F6 of the sixth lens and the effective focal length F of the optical lens satisfy the following relationship: 0.8 ≤ F6 / F ≤ 1.15.

[0022] According to a technical solution of the present invention, the effective focal length F7 of the seventh lens and the effective focal length F6 of the sixth lens satisfy the following relationship: -2.5 ≤ F7 / F6 ≤ -1.8.

[0023] According to a technical solution of the present utility model, the radius of curvature R72 of the image side of the seventh lens and the effective focal length F7 of the seventh lens satisfy the following relationship: 0.4 ≤ |R72 / F7| ≤ 1.4.

[0024] According to a technical solution of the present utility model, the maximum sagitta SSAG_R82_max of the image side of the eighth lens, the sagitta SSAG_R82 at the optically effective diameter position of the image side and the sagitta SSAG_R81 at the optically effective diameter position of the object side satisfy the following relationship: -0.4 ≤ (SSAG_R82_max - SSAG_R82) / SSAG_R81 ≤ -0.17.

[0025] According to a technical solution of the present utility model, the radius of curvature R81 of the object side of the eighth lens and the radius of curvature R82 of the image side satisfy the following relationship: 0.88 ≤ |R81 / R82| ≤ 2.9.

[0026] According to a technical solution of the present utility model, the combined effective focal length F78 of the seventh lens and the eighth lens and the effective focal length F of the optical lens satisfy the following relationship: -2.2 ≤ F / F78 ≤ -1.8.

[0027] According to a technical solution of the present utility model, the effective focal length F7 of the seventh lens, half of the diagonal length H of the imaging chip of the optical lens and the effective focal length F of the optical lens satisfy the following relationship: -18 ≤ F7*H / F ≤ -14.7.

[0028] According to a technical solution of the present utility model, the combined effective focal length Fa of the first lens to the fourth lens, the combined effective focal length Fb of the fifth lens to the eighth lens and the effective focal length F of the optical lens satisfy the following relationship: 1.79 ≤ (Fa - Fb) / F ≤ 2.31.

[0029] According to a technical solution of the present utility model, the total optical length TTL of the optical lens, the effective focal length F and half of the diagonal length H of the imaging chip of the optical lens satisfy the following relationship: 13 ≤ TTL*H / F ≤ 13.62.

[0030] According to a technical solution of the present utility model, the optical lens satisfies at least one of the following conditions:

[0031] 3.95 ≤ F12 / F ≤ 8.7,

[0032] 1.1 ≤ F12 / (Vd1 - Vd2) ≤ 4.25,

[0033] -1.9 ≤ F2 / F1 ≤ -1.2,

[0034] 0.65 ≤ (F / R31) + (F / R32) ≤ 0.9,

[0035] 1 ≤ F4 / F ≤ 1.46,

[0036] -2.8 ≤ F5 / (R51 + R52) ≤ -1.8,

[0037] 0.85 ≤ F6 / F ≤ 1.05,

[0038] -2.4 ≤ F7 / F6 ≤ -1.9,

[0039] 0.5 ≤ |R72 / F7| ≤ 1.3,

[0040] -0.3 ≤ (SSAG_R82_max - SSAG_R82) / SSAG_R81 ≤ -0.17,

[0041] 1 ≤ |R81 / R82| ≤ 2.7,

[0042] -2.0 ≤ F / F78 ≤ -1.85,

[0043] -18 ≤ F7 * H / F ≤ -15.2,

[0044] 1.9 ≤ (Fa - Fb) / F ≤ 2.26,

[0045] 13 ≤ TTL * H / F ≤ 13.6,

[0046] Among them, F12 is the combined effective focal length of the first lens and the second lens, F is the effective focal length of the optical lens, Vd1 is the Abbe number of the first lens, Vd2 is the Abbe number of the second lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, R31 is the curvature radius of the object side of the third lens, R32 is the curvature radius of the image side of the third lens, F4 is the effective focal length of the fourth lens, R51 is the curvature radius of the object side of the fifth lens, R52 is the curvature radius of the image side of the fifth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, F7 is the effective focal length of the seventh lens, R72 is the curvature radius of the image side of the seventh lens, SSAG_R82_max is the maximum sagittal height of the image side of the eighth lens, SSAG_R82 is the sagittal height of the optical effective diameter position of the image side of the eighth lens, SSAG_R81 is the sagittal height of the optical effective diameter position of the object side of the eighth lens, R81 is the curvature radius of the object side of the eighth lens, R82 is the curvature radius of the image side of the eighth lens, F78 is the combined effective focal length of the seventh lens and the eighth lens, H is half of the diagonal length of the imaging chip of the optical lens, Fa is the combined effective focal length of the first lens to the fourth lens, Fb is the combined effective focal length of the fifth lens to the eighth lens, and TTL is the total optical length of the optical lens.

[0047] According to the solution of the present invention, by setting the optical lens to include eight lenses, and setting the optical powers of the first lens to the eighth lens to be positive optical power, negative optical power, positive optical power, positive optical power, negative optical power, positive optical power, negative optical power, and negative optical power respectively, the optical lens has at least one of the characteristics of a large field of view FOV>61°, low distortion (optical distortion ≤ |-2.6%|), low cost, miniaturization (TTL<23mm), large target surface (the diagonal size of the imaging surface can reach 16.4mm), and high resolution (the highest resolution can reach 50 million pixels). BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings without creative efforts based on these drawings.

[0049] Figure 1 It is a schematic structural diagram of the optical lens of Embodiment 1 in the present invention;

[0050] Figure 2Schematic diagram of F-Tan(theta) distortion of the optical lens in the first embodiment of the present utility model;

[0051] Figure 3 Schematic diagram of the structure of the optical lens in the second embodiment of the present utility model;

[0052] Figure 4 Schematic diagram of F-Tan(theta) distortion of the optical lens in the second embodiment of the present utility model;

[0053] Figure 5 Schematic diagram of the structure of the optical lens in the third embodiment of the present utility model;

[0054] Figure 6 Schematic diagram of F-Tan(theta) distortion of the optical lens in the third embodiment of the present utility model;

[0055] Figure 7 Schematic diagram of the structure of the optical lens in the fourth embodiment of the present utility model;

[0056] Figure 8 Schematic diagram of F-Tan(theta) distortion of the optical lens in the fourth embodiment of the present utility model. Detailed implementation manners

[0057] To better understand the present application, more detailed descriptions of various aspects of the present application will be made 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 do not 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.

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

[0059] In the drawings, for the sake of clarity, the thickness, dimensions and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only for illustration and are not drawn to an exact scale.

[0060] In this text, 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 object being photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0061] It should also be understood that the terms "comprises", "comprising", "has", "including" and / or "including having", when used in this specification, denote 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 combinations thereof. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than an individual element in the list. In addition, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0062] Unless otherwise defined, all terms (including technical 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 should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning 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.

[0063] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The following embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but should not be construed as a limitation on the patent scope of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application.

[0064] As Figures 1 to 8 shown, an embodiment of the present utility model provides an optical lens, which sequentially includes, in the direction from the object side to the image side along the optical axis: a first lens L1, a second lens L2, a third lens L3, a stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a protective flat glass CG, wherein the first lens L1 and the second lens L2 are spherical lenses, and the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are aspherical lenses.

[0065] The first lens L1 is a convex-convex lens with a positive optical power, and the second lens L2 is a concave-convex lens with a negative optical power. The first lens L1 and the second lens L2 are glued together, which is beneficial to correcting chromatic aberration, improving color restoration, and enhancing the resolution quality of the lens. At the same time, it is beneficial to reducing the tolerance sensitivity and improving the assembly yield of the lens.

[0066] The third lens L3 is a convex-concave lens with a positive optical power, which is beneficial to correcting astigmatism.

[0067] The fourth lens L4 is a convex-convex lens with a positive optical power, which can compensate for the aberration generated by the front group of lenses (the lenses in front of the aperture, i.e., the first lens L1 to the third lens L3), and reduce the aberration correction pressure of the rear group of lenses (the lenses behind the aperture, i.e., the fourth lens L4 to the eighth lens L8).

[0068] The fifth lens L5 is a convex-concave lens with a negative optical power, which is beneficial to correcting distortion; at the same time, it can effectively and smoothly lift the light, which is beneficial to the rear group to correct the marginal aberration.

[0069] The sixth lens L6 is a convex-convex lens with a positive optical power, which is beneficial to correcting field curvature.

[0070] The image side of the seventh lens L7 is concave, with a negative optical power, which is beneficial to correcting marginal aberration.

[0071] The eighth lens L8 is a concave-concave lens with a negative optical power, which is beneficial to correcting distortion and residual aberration; at the same time, the surface shape of the eighth lens L8 is an aspherical surface, which is beneficial to effectively matching the chip size and large CRA, and helps to achieve a large target surface.

[0072] The first lens L1, the second lens L2, the third lens L3, the aperture STO, and the fourth lens L4 form an internal focusing structure, that is, by taking the first lens L1, the second lens L2, the third lens L3, the aperture STO, and the fourth lens L4 as a focusing group, and by moving the focusing group, the focusing of the scene with an object distance of 1m to Inf is achieved.

[0073] In some embodiments of the present invention, the combined effective focal length F12 of the first lens L1 and the second lens L2 and the effective focal length F of the optical lens satisfy the following relationship: 3.95 ≤ F12 / F ≤ 9.6. Preferably, 3.95 ≤ F12 / F ≤ 8.7. By reasonably controlling the ratio of the combined effective focal length of the first lens L1 and the second lens L2 to the total effective focal length of the optical lens, the incident light of the large field of view angle can be effectively controlled to enter the optical system, the field of view angle can be effectively expanded, and at the same time, the trend of the light can be effectively controlled, so that the light of the large field of view angle can be smoothly transitioned to the rear, which is beneficial to reducing the generation of various aberrations and correcting the spherical aberration of the system, and helps to achieve high resolution.

[0074] In some embodiments of the present utility model, the combined effective focal length F12 of the first lens L1 and the second lens L2, the Abbe number Vd1 of the first lens L1, and the Abbe number Vd2 of the second lens L2 satisfy the following relationship: 1 ≤ F12 / (Vd1 - Vd2) ≤ 4.85. Preferably, 1.1 ≤ F12 / (Vd1 - Vd2) ≤ 4.25. Reasonably allocating the ratio of the Abbe number difference between the first lens L1 and the second lens L2 to the combined effective focal length of the first lens L1 and the second lens L2 is conducive to correcting the chromatic aberration of the system, improving the color restoration degree, and improving the performance quality of the lens.

[0075] In some embodiments of the present utility model, the effective focal length F1 of the first lens L1 and the effective focal length F2 of the second lens L2 satisfy the following relationship: -2 ≤ F2 / F1 ≤ -1.1. Preferably, -1.9 ≤ F2 / F1 ≤ -1.2. Reasonably controlling the ratio of the effective focal lengths of the positive and negative lenses of the first lens L1 and the second lens L2 helps the smooth transition of light, is conducive to correcting chromatic aberration, and at the same time effectively reduces the tolerance sensitivity, which is beneficial to improving the assembly yield of the lens.

[0076] In some embodiments of the present utility model, the curvature radius R31 of the object side of the third lens L3, the curvature radius R32 of the image side, and the effective focal length F of the optical lens satisfy the following relationship: 0.6 ≤ (F / R31) + (F / R32) ≤ 1.2. Preferably, 0.65 ≤ (F / R31) + (F / R32) ≤ 0.9. Reasonably configuring the ratio of the curvature radii of the object side and the image side of the third lens L3 to the total effective focal length of the optical lens is conducive to correcting astigmatism and improving the resolution of the optical system.

[0077] In some embodiments of the present utility model, the effective focal length F4 of the fourth lens L4 and the effective focal length F of the optical lens satisfy the following relationship: 0.9 ≤ F4 / F ≤ 1.46, 1 ≤ F4 / F ≤ 1.46. Reasonably controlling the ratio of the fourth lens L4 to the total effective focal length of the optical system is conducive to correcting the spherical aberration of the system and improving the resolution ability of the lens.

[0078] In some embodiments of the present utility model, the curvature radius R51 of the object side of the fifth lens L5, the curvature radius R52 of the image side, and the effective focal length F5 of the fifth lens L5 satisfy the following relationship: -2.94 ≤ F5 / (R51 + R52) ≤ -1.68. Preferably, -2.8 ≤ F5 / (R51 + R52) ≤ -1.8. Reasonably controlling the ratio of the effective focal length of the fifth lens L5 to the sum of the curvature radii of the object side and the image side of the fifth lens L5 is conducive to better reducing the optical distortion of the lens, achieving low distortion, and controlling the absolute value of the optical distortion within 2.6%.

[0079] In some embodiments of the present utility model, the effective focal length F6 of the sixth lens L6 and the effective focal length F of the optical lens satisfy the following relationship: 0.8 ≤ F6 / F ≤ 1.15. Preferably, 0.85 ≤ F6 / F ≤ 1.05. Controlling the ratio range of the effective focal length of the sixth lens L6 to the total effective focal length of the optical system is beneficial to correcting the field curvature of the optical system and improving the resolution performance of the lens.

[0080] In some embodiments of the present utility model, the effective focal length F7 of the seventh lens L7 and the effective focal length F6 of the sixth lens L6 satisfy the following relationship: -2.5 ≤ F7 / F6 ≤ -1.8. Preferably, -2.4 ≤ F7 / F6 ≤ -1.9. Reasonably controlling the ratio of the effective focal lengths of the sixth lens L6 and the seventh lens L7 is beneficial to correcting the back focal shift of the system after high and low temperatures and helps to ensure that the optical system is not defocused in the high and low temperature environment of -20°C to +60°C.

[0081] In some embodiments of the present utility model, the radius of curvature R72 of the image side of the seventh lens L7 and the effective focal length F7 of the seventh lens L7 satisfy the following relationship: 0.4 ≤ |R72 / F7| ≤ 1.4. Preferably, 0.5 ≤ |R72 / F7| ≤ 1.3. Controlling the ratio of the radius of curvature of the image side of the seventh lens L7 to the effective focal length of the seventh lens L7 is beneficial to correcting the marginal aberration; at the same time, it makes the marginal rays rise slowly, which is beneficial to achieving a large target surface.

[0082] In some embodiments of the present utility model, the maximum sagittal height SSAG_R82_max of the image side of the eighth lens L8, the sagittal height SSAG_R82 at the optically effective diameter position of the image side, and the sagittal height SSAG_R81 at the optically effective diameter position of the object side satisfy the following relationship: -0.4 ≤ (SSAG_R82_max - SSAG_R82) / SSAG_R81 ≤ -0.17. Preferably, -0.3 ≤ (SSAG_R82_max - SSAG_R82) / SSAG_R81 ≤ -0.17. Reasonably controlling the sagittal heights of the object side and the image side of the eighth lens L8 is beneficial to correcting the optical distortion, achieving low distortion, and controlling the absolute value of the optical distortion within 2.6%.

[0083] In some embodiments of the present utility model, the radius of curvature R81 of the object side of the eighth lens L8 and the radius of curvature R82 of the image side satisfy the following relationship: 0.88 ≤ |R81 / R82| ≤ 2.9. Preferably, 1 ≤ |R81 / R82| ≤ 2.7. Reasonably controlling the ratio of the radius of curvature of the object side and the image side of the eighth lens L8 is beneficial to better correcting the distortion, achieving low distortion, and controlling the absolute value of the optical distortion within 2.6%.

[0084] In some embodiments of the present utility model, the combined effective focal length F78 of the seventh lens L7 and the eighth lens L8 and the effective focal length F of the optical lens satisfy the following relationship: -2.2 ≤ F / F78 ≤ -1.8. Preferably, -2.0 ≤ F / F78 ≤ -1.85. By controlling the ratio of the combined focal length of the seventh lens L7 and the eighth lens L8 to the effective focal length of the system, the light is transmitted smoothly, and the relative illumination of the system is improved.

[0085] In some embodiments of the present utility model, the effective focal length F7 of the seventh lens L7, half of the diagonal length H of the imaging chip of the optical lens, and the effective focal length F of the optical lens satisfy the following relationship: -18 ≤ F7*H / F ≤ -14.7. Preferably, -18 ≤ F7*H / F ≤ -15.2. By reasonably controlling the effective focal length of the seventh lens L7, the light is lifted, which is beneficial to effectively match the chip size and large CRA, and helps to achieve a large target surface.

[0086] In some embodiments of the present utility model, the combined effective focal length Fa of the first lens L1 to the fourth lens L4, the combined effective focal length Fb of the fifth lens L5 to the eighth lens L8, and the effective focal length F of the optical lens satisfy the following relationship: 1.79 ≤ (Fa - Fb) / F ≤ 2.31. Preferably, 1.9 ≤ (Fa - Fb) / F ≤ 2.26. By reasonably controlling the combined effective focal length of the first lens L1 to the fourth lens L4 and the combined effective focal length of the fifth lens L5 to the eighth lens L8, it is beneficial to balance various aberrations of the system and improve the resolution of the lens. At the same time, when the lens is focused, the lens can achieve clear focus on the scenery with an object distance of 1m to Inf, so that the resolution of the lens meets the requirements of high resolution, and the highest resolution can reach 50 million pixels.

[0087] In some embodiments of the present utility model, the total optical length TTL, the effective focal length F of the optical lens, and half of the diagonal length H of the imaging chip of the optical lens satisfy the following relationship: 13 ≤ TTL*H / F ≤ 13.62. Preferably, 13 ≤ TTL*H / F ≤ 13.6. By reasonably setting the focal length, half image height, and total system length, the requirements for compatible monitoring perspectives corresponding to different chips can be met. When the half image height is determined and a certain system focal length value is set, by reasonably controlling the total optical length of the system, the total optical length of the system is smaller, which is beneficial to realizing a small volume of the lens.

[0088] Four specific embodiments are given below according to the above settings of the present utility model to specifically illustrate the optical lens according to the present utility model. The optical lens according to the present utility model has a total of eight lenses. Each cemented surface of the cemented lens is denoted as one surface. Together with the stop STO, the protective glass CG, and the image plane IMA, there are a total of 19 surfaces. Among them, the stop STO is disposed between the third lens L3 and the fourth lens L4. For the convenience of description, each lens surface, the stop STO, and the protective glass CG are numbered S1, S2 to S18. And the aspheric surface satisfies the following formula:

[0089]

[0090] In the above formula, z is the axial distance from the vertex of the curved surface at the position where the height perpendicular to the optical axis is y along the optical axis direction; c represents the curvature at the vertex of the aspheric surface; k is the conic coefficient; A4, A6, A8, A 10 、A 12 、A 14 、A 16 ··· represent the aspheric coefficients of the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, sixteenth order ··· respectively.

[0091] The data of the four groups of embodiments are as shown in Table 1 below:

[0092] Conditional Example 1 Example 2 Example 3 Example 4 3.95 ≤ F12 / F ≤ 9.6 5.02 8.64 4.70 4.00 1 ≤ F12 / (Vd1 - Vd2) ≤ 4.85 4.23 3.27 1.13 4.12 -2 ≤ F2 / F1 ≤ -1.1 -1.30 -1.25 -1.85 -1.36 0.6 ≤ (F / R31) + (F / R32) ≤ 1.2 0.67 0.81 0.86 0.78 0.9 ≤ F4 / F ≤ 1.46 1.34 1.03 1.33 1.39 -2.94 ≤ F5 / (R51 + R52) ≤ -1.68 -1.86 -2.76 -2.13 -2.39 0.8 ≤ F6 / F ≤ 1.15 0.96 1.01 0.90 0.93 -2.5 ≤ F7 / F6 ≤ -1.8 -2.04 -1.94 -2.37 -2.00 0.4 ≤ |R72 / F7| ≤ 1.4 0.55 0.77 0.52 1.27 -0.4 ≤ (SSAG_R82_max - SSAG_R82) / SSAG_R81 ≤ -0.17 -0.21 -0.24 -0.18 -0.24 0.88 ≤ |R81 / R82| ≤ 2.9 1.20 1.17 2.61 2.20 -2.2 ≤ F / F78 ≤ -1.8 -1.92 -1.98 -1.90 -1.99 -18 ≤ F7*H / F ≤ -14.7 -16.10 -16.01 -17.55 -15.24 1.79 ≤ (Fa - Fb) / F ≤ 2.31 1.978 1.992 2.237 2.071 13 ≤ TTL*H / F ≤ 13.62 13.43 13.53 13.10 13.21

[0093] Table 1

[0094] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be enumerated one by one here, but the embodiments of the present invention are not limited to the following embodiments.

[0095] Embodiment 1

[0096] Figure 1 is a schematic structural diagram of the optical lens of Embodiment 1 in the present utility model;

[0097] Figure 2 is a schematic diagram of the F-Tan(theta) distortion of the optical lens of Embodiment 1 in the present utility model.

[0098] In Embodiment 1, the first lens L1 is a convex-convex lens with a positive optical power, the second lens L2 is a concave-convex lens with a negative optical power, the third lens L3 is a convex-concave lens with a positive optical power, the fourth lens L4 is a convex-convex lens with a positive optical power, the fifth lens L5 is a concave-convex lens with a negative optical power, the sixth lens L6 is a convex-convex lens with a positive optical power, the seventh lens L7 is a concave-convex lens with a negative optical power, and the eighth lens L8 is a concave-concave lens with a negative optical power.

[0099] The third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are aspherical lenses; the aperture stop STO is disposed between the third lens L3 and the fourth lens L4.

[0100] Table 2 lists the relevant parameters of each lens in the optical lens of this embodiment, including: surface type, radius of curvature R, thickness d, refractive index Nd of the material, and Abbe number Vd.

[0101]

[0102]

[0103] Table 2

[0104] Table 3 lists the aspherical coefficients of each aspherical lens in the optical lens of this embodiment, including: conic constant K of the surface, fourth-order aspherical coefficient A4, sixth-order aspherical coefficient A6, eighth-order aspherical coefficient A8, tenth-order aspherical coefficient A 10 , twelfth-order aspherical coefficient A 12 , fourteenth-order aspherical coefficient A 14 and sixteenth-order aspherical coefficient A 16 .

[0105] Surface number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 > <![CDATA[A 12 > <![CDATA[A 14 > <![CDATA[A 16 > S4 -62.40 -3.95E-04 -2.23E-05 6.53E-07 -4.65E-09 7.09E-11 -2.61E-12 3.12E-14 S5 -90.00 -1.08E-03 3.33E-06 9.45E-07 -2.33E-08 5.64E-10 -2.56E-11 6.54E-13 S7 54.58 -7.87E-04 -3.89E-05 1.98E-06 -8.58E-08 -1.10E-08 1.30E-09 -5.31E-11 S8 -17.14 -1.40E-03 -1.32E-05 1.12E-06 -6.05E-08 -5.60E-09 5.21E-10 -1.93E-11 S9 3.31 -1.62E-03 1.01E-05 4.48E-07 -3.35E-08 -1.07E-10 2.72E-11 -8.11E-13 S10 0.65 -2.19E-03 5.51E-05 -2.86E-06 9.91E-08 -7.37E-10 -6.23E-11 1.26E-12 S11 60.13 -1.39E-03 3.37E-05 -1.48E-06 1.31E-08 2.17E-09 7.83E-12 -2.60E-12 S12 -0.51 -2.14E-04 -3.40E-06 2.46E-07 -1.00E-09 2.13E-10 6.24E-12 -6.09E-13 S13 -90.00 8.65E-05 -6.39E-05 2.30E-06 -2.84E-08 -1.19E-09 3.64E-11 -6.63E-13 S14 0.31 7.82E-05 -7.01E-05 2.80E-06 -6.29E-08 5.41E-10 -1.38E-12 3.54E-14 S15 0.25 -2.03E-03 6.71E-05 -1.86E-06 4.18E-08 -2.22E-10 -4.27E-12 4.61E-14 S16 -22.63 -5.96E-04 2.04E-06 2.54E-07 -8.98E-09 3.82E-11 1.85E-12 -1.72E-14

[0106] Table 3

[0107] Combined Figure 1 , Figure 2 As shown in the above Table 1 to Table 3, in the first embodiment, the effective focal length F of the optical lens is 13.98, the field of view angle FOV is 61.56°, and the optical distortion is -2.43%.

[0108] The first embodiment is an optical lens having at least one of the characteristics of a large field of view FOV>61°, low distortion (optical distortion ≤ |-2.6%|), low cost, miniaturization (TTL<23mm), large target surface (imaging surface diagonal size up to 16.4mm), high resolution (resolution up to 50 million pixels), etc.

[0109] Embodiment 2

[0110] Figure 3 is a schematic structural diagram of the optical lens of the second embodiment in the present invention;

[0111] Figure 4 is a schematic diagram of the F-Tan(theta) distortion of the optical lens of the second embodiment in the present invention.

[0112] In the second embodiment, the first lens L1 is a convex-convex lens with positive optical power, the second lens L2 is a concave-convex lens with negative optical power, the third lens L3 is a convex-concave lens with positive optical power, the fourth lens L4 is a convex-convex lens with positive optical power, the fifth lens L5 is a convex-concave lens with negative optical power, the sixth lens L6 is a convex-convex lens with positive optical power, the seventh lens L7 is a concave-concave lens with negative optical power, and the eighth lens L8 is a concave-concave lens with negative optical power.

[0113] The third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are aspherical lenses; the aperture stop STO is disposed between the third lens L3 and the fourth lens L4.

[0114] Table 4 lists the relevant parameters of each lens in the optical lens of this embodiment, including: surface type, radius of curvature R, thickness d, refractive index Nd of the material, and Abbe number Vd.

[0115]

[0116]

[0117] Table 4

[0118] Table 5 lists the aspherical coefficients of each aspherical lens in the optical lens of this embodiment, including: conic constant K of the surface, fourth-order aspherical coefficient A4, sixth-order aspherical coefficient A6, eighth-order aspherical coefficient A8, tenth-order aspherical coefficient A 10 , twelfth-order aspherical coefficient A 12 , fourteenth-order aspherical coefficient A 14 , and sixteenth-order aspherical coefficient A 16 .

[0119] Surface number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 > <![CDATA[A 12 > <![CDATA[A 14 > <![CDATA[A 16 > S4 -90.00 -6.01E-04 -1.40E-05 7.55E-07 -7.14E-09 0.00E+00 0.00E+00 0.00E+00 S5 52.05 -1.29E-03 4.10E-06 1.23E-06 -3.05E-08 0.00E+00 0.00E+00 0.00E+00 S7 -0.98 -2.34E-04 -1.44E-05 1.15E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S8 1.02 -4.58E-05 -2.51E-05 1.08E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S9 0.90 -1.57E-03 2.13E-05 -1.54E-06 5.94E-08 -2.15E-09 0.00E+00 0.00E+00 S10 0.64 -2.59E-03 4.16E-05 -3.61E-06 7.56E-08 -2.64E-09 0.00E+00 0.00E+00 S11 -22.58 -1.49E-03 -1.23E-06 -7.11E-07 1.78E-08 3.22E-09 0.00E+00 0.00E+00 S12 0.71 -8.77E-04 2.30E-05 -3.14E-07 4.10E-09 1.78E-09 0.00E+00 0.00E+00 S13 90.00 2.09E-04 -4.71E-05 2.66E-06 -3.69E-08 -8.81E-10 0.00E+00 0.00E+00 S14 10.68 4.98E-04 -8.33E-05 2.97E-06 -5.34E-08 1.62E-10 0.00E+00 0.00E+00 S15 3.43 -2.12E-03 9.12E-05 -3.26E-06 7.46E-08 -5.46E-10 0.00E+00 0.00E+00 S16 -20.52 -8.54E-04 2.24E-05 -4.97E-07 4.72E-09 -1.13E-11 0.00E+00 0.00E+00

[0120] Table 5

[0121] Combined with Figure 3 , Figure 4 and as shown in Table 1, Table 4, and Table 5 above, combined with Figure 1 and Figure 2 and as shown in Table 1 to Table 3 above, in the second embodiment, the effective focal length F of the optical lens is 13.86, the field of view FOV is 61.11°, and the optical distortion is -0.75%.

[0122] The second embodiment is an optical lens that has at least one of the following characteristics: a large field of view FOV > 61°, low distortion (optical distortion ≤ |-2.6%|), low cost, miniaturization (TTL < 23 mm), a large image sensor format (the diagonal size of the imaging surface can reach 16.4 mm), and high resolution (the highest resolution can reach 50 million pixels).

[0123] Embodiment Three

[0124] Figure 5 It is a schematic structural diagram of the optical lens in Embodiment Three of the present utility model;

[0125] Figure 6 It is a schematic diagram of the F-Tan(theta) distortion of the optical lens in Embodiment Three of the present utility model.

[0126] In Embodiment Three, the first lens L1 is a convex-convex lens with a positive optical power, the second lens L2 is a concave-convex lens with a negative optical power, the third lens L3 is a convex-concave lens with a positive optical power, the fourth lens L4 is a convex-convex lens with a positive optical power, the fifth lens L5 is a concave-convex lens with a negative optical power, the sixth lens L6 is a convex-convex lens with a positive optical power, the seventh lens L7 is a concave-convex lens with a negative optical power, and the eighth lens L8 is a concave-concave lens with a negative optical power.

[0127] The third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are aspherical lenses; the aperture stop STO is disposed between the third lens L3 and the fourth lens L4.

[0128] Table 6 lists the relevant parameters of each lens in the optical lens of this embodiment, including: surface type, radius of curvature R, thickness d, refractive index Nd of the material, and Abbe number Vd.

[0129] Surface number Surface type Radius of curvature R Thickness d Refractive index Nd Abbe number Vd S1 Spherical surface 28.020 2.019 1.50 81.61 S2 Spherical surface -32.872 0.603 1.85 23.78 S3 Spherical surface -102.473 0.548 S4 Aspherical surface 27.641 1.297 1.64 23.53 S5 Aspherical surface 38.938 1.201 S6(STO) Spherical surface Infinity 0.901 S7 Aspherical surface 49.668 1.752 1.54 55.71 S8 Aspherical surface -12.161 0.868 S9 Aspherical surface 9.286 1.149 1.64 23.53 S10 Aspherical surface 6.145 1.044 S11 Aspherical surface 36.390 2.673 1.54 55.71 S12 Aspherical surface -8.020 0.100 S13 Aspherical surface 80.920 1.800 1.64 23.53 S14 Aspherical surface 15.340 2.827 S15 Aspherical surface -21.357 1.932 1.54 55.71 S16 Aspherical surface 8.185 0.978 S17 Spherical surface Infinity 0.300 1.52 64.20 S18 Spherical surface Infinity 0.200 IMA Spherical surface Infinity 0.000

[0130] Table 6

[0131] Table 7 lists the aspherical coefficients of each aspherical lens in the optical lens of this embodiment, including: the conic constant K of the surface, the fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, the tenth-order aspherical coefficient A 10 , the twelfth-order aspherical coefficient A 12 , the fourteenth-order aspherical coefficient A 14 and the sixteenth-order aspherical coefficient A 16 .

[0132]

[0133]

[0134] Table 7

[0135] Combined Figure 5 、 Figure 6 As shown in Table 1, Table 6 and Table 7 above, in the third embodiment, the effective focal length F of the optical lens is 13.89, the field of view FOV is 61.52°, and the optical distortion is -1.67%.

[0136] The third embodiment is an optical lens having at least one of the characteristics of a large field of view FOV>61°, low distortion (optical distortion ≤ |-2.6%|), low cost, miniaturization (TTL<23mm), large target surface (imaging surface diagonal size up to 16.4mm), and high resolution (highest resolution up to 50 million pixels).

[0137] Embodiment Four

[0138] Figure 7 It is a schematic structural diagram of the optical lens in Embodiment Four of the present utility model;

[0139] Figure 8 It is a schematic diagram of the F-Tan(theta) distortion of the optical lens in Embodiment Four of the present utility model.

[0140] In the fourth embodiment, the first lens L1 is a convex-convex lens with a positive optical power, the second lens L2 is a concave-convex lens with a negative optical power, the third lens L3 is a convex-concave lens with a positive optical power, the fourth lens L4 is a convex-convex lens with a positive optical power, the fifth lens L5 is a convex-concave lens with a negative optical power, the sixth lens L6 is a convex-convex lens with a positive optical power, the seventh lens L7 is a concave-concave lens with a negative optical power, and the eighth lens L8 is a concave-concave lens with a negative optical power.

[0141] The third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are aspherical lenses; the aperture stop STO is arranged between the third lens L3 and the fourth lens L4.

[0142] Table 8 lists the relevant parameters of each lens in the optical lens of this embodiment, including: surface type, radius of curvature R, thickness d, refractive index Nd of the material and Abbe number Vd.

[0143] Surface number Surface type Radius of curvature R Thickness d Refractive index Nd Abbe number Vd S1 Spherical surface 84.157 2.413 1.83 37.32 S2 Spherical surface -14.640 0.600 1.85 23.78 S3 Spherical surface -93.572 0.120 S4 Aspherical surface 25.602 2.607 1.54 55.71 S5 Aspherical surface 58.699 1.206 S6(STO) Spherical surface Infinity 1.000 S7 Aspherical surface 36.683 1.708 1.54 55.71 S8 Aspherical surface -14.232 0.847 S9 Aspherical surface 10.428 1.479 1.64 23.53 S10 Aspherical surface 7.106 1.093 S11 Aspherical surface 30.397 2.312 1.54 55.71 S12 Aspherical surface -8.780 0.100 S13 Aspherical surface -34.370 1.472 1.64 23.53 S14 Aspherical surface 33.066 2.050 S15 Aspherical surface -19.106 1.896 1.54 55.71 S16 Aspherical surface 8.684 1.100 S17 Spherical surface Infinity 0.300 1.52 64.20 S18 Spherical surface Infinity 0.200 IMA Spherical surface Infinity 0.000

[0144] Table 8

[0145] Table 9 lists the aspherical coefficients of each aspherical lens in the optical lens of this embodiment, including: conic constant K of the surface, fourth-order aspherical coefficient A4, sixth-order aspherical coefficient A6, eighth-order aspherical coefficient A8, tenth-order aspherical coefficient A 10 、twelfth-order aspherical coefficient A12 , the aspheric coefficient A of the fourteenth order 14 and the aspheric coefficient A of the sixteenth order 16 .

[0146] Surface number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 > <![CDATA[A 12 > <![CDATA[A 14 > <![CDATA[A 16 > S4 -55.23 -5.09E-04 -2.32E-05 7.10E-07 -4.18E-09 -7.50E-12 0.00E+00 0.00E+00 S5 90.00 -1.36E-03 -2.48E-06 1.53E-06 -4.91E-08 6.69E-10 0.00E+00 0.00E+00 S7 20.14 -7.44E-04 -5.43E-05 5.85E-06 -7.47E-07 5.35E-08 -1.81E-09 0.00E+00 S8 -29.01 -1.78E-03 2.14E-05 -6.03E-07 -1.64E-07 1.49E-08 -6.06E-10 0.00E+00 S9 1.86 -1.37E-03 3.56E-06 8.34E-07 -7.19E-08 2.05E-09 -4.72E-11 0.00E+00 S10 0.51 -2.00E-03 4.25E-05 -2.74E-06 1.12E-07 -4.01E-09 4.91E-11 0.00E+00 S11 21.23 -1.25E-03 3.63E-05 -1.42E-06 -3.15E-08 4.34E-09 -5.60E-11 0.00E+00 S12 -0.72 -1.00E-04 -5.55E-06 -3.05E-07 3.64E-08 -3.61E-10 3.20E-11 0.00E+00 S13 33.25 6.94E-04 -9.45E-05 2.53E-06 -1.59E-08 1.77E-10 -2.71E-11 0.00E+00 S14 0.57 7.93E-04 -9.79E-05 3.45E-06 -6.57E-08 4.52E-10 1.50E-12 0.00E+00 S15 1.62 -2.68E-03 9.94E-05 -2.59E-06 5.38E-08 -4.12E-10 -4.65E-13 0.00E+00 S16 -14.78 -9.76E-04 1.74E-05 -1.19E-07 -5.87E-09 1.39E-10 -7.87E-13 0.00E+00

[0147] Table 9

[0148] Combined Figure 7 , Figure 8 and as shown in Table 1, Table 8 and Table 9 above, in the fourth embodiment, the effective focal length F of the optical lens is 13.97, the field of view FOV is 61.52°, and the optical distortion is -2.26%.

[0149] The fourth embodiment is an optical lens having at least one of the characteristics such as a large field of view FOV > 61°, low distortion (optical distortion ≤ |-2.6%|), low cost, miniaturization (TTL < 23 mm), large target surface (the diagonal size of the imaging surface can reach 16.4 mm), and high resolution (the highest resolution can reach 50 million pixels).

[0150] The above description is only the preferred embodiments of the present application and the description of the applied technical principles. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solutions formed by the 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 technical solutions formed by the mutual replacement of the above features and the technical features (but not limited to) with similar functions disclosed in the present application.

Claims

1. An optical lens, comprising, in order from the object side to the image side along the optical axis: a first lens (L1) having positive focal power, a second lens (L2) having negative focal power, a third lens (L3) having positive focal power, a fourth lens (L4) having positive focal power, a fifth lens (L5) having negative focal power, a sixth lens (L6) having positive focal power, a seventh lens (L7) having negative focal power, and an eighth lens (L8) having negative focal power, wherein the eighth lens (L8) is a concave-concave lens; The combined effective focal length F12 of the first lens (L1) and the second lens (L2), the Abbe number Vd1 of the first lens (L1) and the Abbe number Vd2 of the second lens (L2) satisfy the following relationship: 1≤F12 / (Vd1-Vd2)≤4.

85.

2. The optical lens according to claim 1, characterized in that: The first lens (L1) is a convex-convex lens, the second lens (L2) is a concave-convex lens, the third lens (L3) is a convex-concave lens, and the fourth lens (L4) is a convex-convex lens.

3. The optical lens according to claim 1, characterized in that: The first lens (L1), the second lens (L2), the third lens (L3), the stop (STO), and the fourth lens (L4) form a fixed focus structure or an internal focus structure.

4. The optical lens according to claim 1, characterized in that: The first lens (L1) and the second lens (L2) form a doublet lens.

5. The optical lens according to claim 1, characterized in that: The fifth lens (L5) is a convex-concave lens, the sixth lens (L6) is a convex-convex lens, and the image side surface of the seventh lens (L7) is a concave surface.

6. The optical lens according to any one of claims 1 to 4, characterized in that: The effective focal length F12 of the combination of the first lens (L1) and the second lens (L2) and the effective focal length F of the optical lens satisfy the following relationship: 3.95≤F12 / F≤9.

6.

7. The optical lens according to any one of claims 1 to 5, characterized in that: The effective focal length F1 of the first lens (L1) and the effective focal length F2 of the second lens (L2) satisfy the following relationship: -2≤F2 / F1≤-1.

1.

8. The optical lens according to any one of claims 1 to 5, characterized in that: The curvature radius R31 of the object side surface and the curvature radius R32 of the image side surface of the third lens (L3) satisfy the following relationship with the effective focal length F of the optical lens: 0.6≤(F / R31)+(F / R32)≤1.

2.

9. The optical lens according to any one of claims 1 to 5, characterized in that: The effective focal length F4 of the fourth lens (L4) and the effective focal length F of the optical lens satisfy the following relationship: 0.9≤F4 / F≤1.

46.

10. The optical lens according to any one of claims 1 to 5, characterized in that: The curvature radius R51 of the object side surface and the curvature radius R52 of the image side surface of the fifth lens (L5) and the effective focal length F5 of the fifth lens (L5) satisfy the following relationship: -2.94≤F5 / (R51+R52)≤-1.

68.

11. The optical lens according to any one of claims 1 to 5, characterized in that: The effective focal length F6 of the sixth lens (L6) and the effective focal length F of the optical lens satisfy the following relationship: 0.8≤F6 / F≤1.

15.

12. The optical lens according to any one of claims 1 to 5, characterized in that: The effective focal length F7 of the seventh lens (L7) and the effective focal length F6 of the sixth lens (L6) satisfy the following relationship: -2.5≤F7 / F6≤-1.

8.

13. The optical lens according to any one of claims 1 to 5, characterized in that: A curvature radius R72 of the image-side surface of the seventh lens (L7) and an effective focal length F7 of the seventh lens (L7) satisfy the following relationship: 0.4≤|R72 / F7|≤1.

4.

14. The optical lens according to any one of claims 1 to 5, characterized in that: The maximum sag height SSAG_R82_max of the image side surface, the sag height SSAG_R82 of the optical effective diameter position of the image side surface and the sag height SSAG_R81 of the optical effective diameter position of the object side surface of the eighth lens (L8) satisfy the following relationship: -0.4≤(SSAG_R82_max-SSAG_R82) / SSAG_R81≤-0.

17.

15. The optical lens according to any one of claims 1 to 5, characterized in that: A curvature radius R81 of the object-side surface and a curvature radius R82 of the image-side surface of the eighth lens (L8) satisfy the following relationship: 0.88≤|R81 / R82|≤2.

9.

16. The optical lens according to any one of claims 1 to 5, characterized in that: The effective focal length F78 of the combination of the seventh lens (L7) and the eighth lens (L8) and the effective focal length F of the optical lens satisfy the following relationship: -2.2≤F / F78≤-1.

8.

17. The optical lens according to any one of claims 1 to 5, characterized in that: The effective focal length F7 of the seventh lens (L7), half H of the diagonal length of the imaging chip of the optical lens and the effective focal length F of the optical lens satisfy the following relationship: -18≤F7*H / F≤-14.

7.

18. The optical lens according to any one of claims 1 to 5, characterized in that: The combined effective focal length Fa of the first lens (L1) to the fourth lens (L4), the combined effective focal length Fb of the fifth lens (L5) to the eighth lens (L8) and the effective focal length F of the optical lens satisfy the following relationship: 1.79≤(Fa-Fb) / F≤2.

31.

19. The optical lens according to any one of claims 1 to 5, characterized in that: The total optical length TTL of the optical lens, the effective focal length F and half the diagonal length H of the imaging chip of the optical lens satisfy the following relationship: 13≤TTL*H / F≤13.

62.

20. The optical lens according to claim 1, characterized in that: The optical lens meets at least one of the following conditions: 3.95≤F12 / F≤8.7, 1.1≤F12 / (Vd1-Vd2)≤4.25, -1.9≤F2 / F1≤-1.2, 0.65≤(F / R31)+(F / R32)≤0.9, 1≤F4 / F≤1.46, -2.8≤F5 / (R51+R52)≤-1.8, 0.85≤F6 / F≤1.05, -2.4≤F7 / F6≤-1.9, 0.5≤|R72 / F7|≤1.3, -0.3≤(SSAG_R82_max-SSAG_R82) / SSAG_R81≤-0.17, 1≤|R81 / R82|≤2.7, -2.0≤F / F78≤-1.85, -18≤F7*H / F≤-15.2, 1.9≤(Fa-Fb) / F≤2.26, 13≤TTL*H / F≤13.6, Wherein, F12 is the effective focal length of the combination of the first lens (L1) and the second lens (L2), F is the effective focal length of the optical lens, Vd1 is the Abbe number of the first lens (L1), Vd2 is the Abbe number of the second lens (L2), F1 is the effective focal length of the first lens (L1), F2 is the effective focal length of the second lens (L2), R31 is the radius of curvature of the object side surface of the third lens (L3), R32 is the radius of curvature of the image side surface of the third lens (L3), F4 is the effective focal length of the fourth lens (L4), R51 is the radius of curvature of the object side surface of the fifth lens (L5), R52 is the radius of curvature of the image side surface of the fifth lens (L5), F5 is the effective focal length of the fifth lens (L5), F6 is the effective focal length of the sixth lens (L6), F7 is the effective focal length of the seventh lens (L7), and R72 is The curvature radius of the image side surface of the seventh lens (L7), SSAG_R82_max is the maximum sag height of the image side surface of the eighth lens (L8), SSAG_R82 is the sag height of the optical effective diameter position of the image side surface of the eighth lens (L8), SSAG_R81 is the sag height of the optical effective diameter position of the object side surface of the eighth lens (L8), R81 is the curvature radius of the object side surface of the eighth lens (L8), R82 is the curvature radius of the image side surface of the eighth lens (L8), F78 is the combined effective focal length of the seventh lens (L7) and the eighth lens (L8), H is half of the diagonal length of the imaging chip of the optical lens, Fa is the combined effective focal length of the first lens (L1) to the fourth lens (L4), Fb is the combined effective focal length of the fifth lens (L5) to the eighth lens (L8), and TTL is the total optical length of the optical lens.

Images