Optical lens and electronic equipment

Abstract

The invention discloses an optical lens and electronic equipment. The optical lens sequentially comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with focal power, a fourth lens with positive focal power, a fifth lens with focal power and a sixth lens with focal power from a first side to a second side along an optical axis, the seventh lens has positive focal power; the eighth lens has focal power; the fifth lens and the sixth lens form a balsaming lens group, and the positive and negative attributes of the focal power of the fifth lens and the sixth lens are opposite; the combined focal length F56 of the fifth lens and the sixth lens and the effective focal length F of the optical lens meet the condition that F56 / F is greater than or equal to 1 and less than or equal to 15; the air interval d78 between the seventh lens and the eighth lens on the optical axis and the total optical length TTL of the optical lens meet the condition that d78 / TTL is larger than or equal to 0.02 and smaller than or equal to 0.2. And the effective focal length F8 of the eighth lens and the effective focal length F of the optical lens meet the condition that F8 / F is greater than or equal to 9.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and more specifically, to an optical lens and an electronic device. Background Art

[0002] In recent years, thanks to the rapid development of automobile assisted driving systems, lenses have been widely used in automobiles, including on-board reversing visual systems, driving recorders, automatic parking and panoramic parking systems, road finding systems, etc.

[0003] The vehicle-mounted lens is a key component for the automatic driving assistance system to obtain external information. In order to ensure driving safety and more accurately detect the driving environment, people have an increasingly high demand for vehicle-mounted lenses. At the same time, the performance and structural size requirements for the lenses used for side view, front view, and surround view are also becoming increasingly high, which is mainly reflected in the following aspects: 1) In order to obtain information more accurately, the system needs to be equipped with a larger chip with higher resolution, so the resolution requirements for the lens itself are getting higher and higher; 2) In order to meet higher imaging quality requirements, more lens structures are often selected, but this will seriously affect the miniaturization of the lens; 3) On the basis of meeting the imaging requirements of vehicle-mounted lenses, the smaller the lens, the easier it is to install the vehicle-mounted lens, but this will lead to a contradiction between the resolution and miniaturization of ordinary vehicle-mounted lenses; 4) The CRA (Chief Ray Angle) design of the lens also needs to match the chip. Excessive CRA will cause serious color cast problems; 5) For practical reasons, vehicle-mounted lenses used for assisted driving should meet night vision requirements as much as possible to improve the safety of autonomous driving at night.

[0004] The optical lenses in the prior art still have the following problems: 1) They cannot meet the requirements of high resolution and miniaturization at the same time; 2) They cannot meet the requirements of small front port diameter and miniaturization at the same time; 3) They cannot meet the requirement of small CRA of the optical lens. A small CRA can avoid stray light hitting the lens barrel when the light is emitted from the rear end, and can match the vehicle-mounted chip well without color cast and vignetting; 4) The light transmission ability is not strong and cannot meet the requirements in low-light environments such as at night. Summary of the invention

[0005] In a first aspect, the present application provides an optical lens, which includes, in order from the first side to the second side along the optical axis: a first lens with negative optical power, a second lens with positive optical power, a third lens with optical power, a fourth lens with positive optical power, a fifth lens with optical power, a sixth lens with optical power, a seventh lens with positive optical power, and an eighth lens with optical power; the number of lenses with optical power in the optical lens is eight. The second side surface of the first lens is concave. At least one of the first side surface and the second side surface of the second lens is convex. The first side surface of the third lens is concave, and the second side surface is convex. The first side surface of the fourth lens is convex, and the second side surface is convex. The first side surface of the seventh lens is convex, and the second side surface is concave. The fifth lens and the sixth lens form a cemented lens group, and the positive and negative properties of the optical powers of the fifth lens and the sixth lens are opposite; the combined focal length F56 of the fifth lens and the sixth lens satisfies the following conditions: 1≤|F56 / F|≤15; the air interval d78 between the seventh lens and the eighth lens on the optical axis satisfies the following conditions: 0.02≤d78 / TTL≤0.2; and the effective focal length F8 of the eighth lens satisfies the following conditions: |F8 / F|≥9.

[0006] In one embodiment, the optical lens satisfies at least one of the following conditional formulas: 0.29≤D82 / TTL≤0.4, 1≤|F3 / F|≤40, 1≤F7 / F≤25, 55°≤(FOV×F) / H≤70°, 2.5≤TTL / H≤3.5, 0.06≤BFL / TL≤0.16, -17≤R32 / F≤-0.5, 0.45≤F / H≤0.7, 1.4≤F / ENPD≤2, 0.8≤D82 / H≤1.2, wherein D82 is the maximum clear aperture of the second side surface of the eighth lens corresponding to the maximum field of view of the optical lens, F3 is the effective focal length of the third lens, F7 is the effective focal length of the seventh lens, FOV is the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, BFL is the optical back focus of the optical lens, TL is the distance on the optical axis from the center of the first side surface of the first lens to the center of the second side surface of the eighth lens, R32 is the curvature radius of the second side surface of the third lens, and ENPD is the entrance pupil diameter of the optical lens.

[0007] In one embodiment, the optical lens satisfies at least one of the following conditional expressions: 10≤|F8 / F|≤2000, 0.7≤d8 / (d8+SAG82-SAG81)≤1.3, 0.30≤D / TTL≤0.33, 0.07≤(d2+d3) / TTL≤0.2, 0.3≤D82 / TTL≤0.39, 0.03≤d78 / TTL≤0.19, 0.01≤R71 / R72≤1, 2≤R72 / d78≤600, 0.5≤|F5 / F6|≤2.8, 0.02≤d23 / TTL≤0.16, -1.5≤F1 / F≤-1.1, 3≤F2 / F≤260, 1.3≤|F3 / F|≤ 35, 1≤F4 / F≤2.2, 1.5≤F7 / F≤20, 1.2≤|F56 / F|≤12, 58°≤(FOV×F) / H≤65°, 0 .008≤D / H / FOV×1°≤0.01, 2.8≤TTL / H≤3, 0.065≤BFL / TL≤0.15, |R11 / F|≥25 , 0.07≤(1 / F4+1 / F56+1 / F7) / (1 / F)≤1.8, -14≤R32 / F≤-0.8, 0.5≤F / H≤0.65 , 0.002≤d34 / TTL≤0.006, 4.5≤TTL / F≤5, 1.6≤F / ENPD≤1.9, 0.85≤D82 / H≤1.1, wherein d8 is the center thickness of the eighth lens on the optical axis, SAG82 is the distance from the intersection of the second side surface of the eighth lens and the optical axis to the vertex of the effective radius of the second side surface of the eighth lens on the optical axis, SAG81 is the distance from the intersection of the first side surface of the eighth lens and the optical axis to the vertex of the effective radius of the first side surface of the eighth lens on the optical axis, D is the maximum clear aperture of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, d2 is the center thickness of the second lens on the optical axis, d3 is the center thickness of the third lens on the optical axis, D82 is the maximum clear aperture of the second side surface of the eighth lens corresponding to the maximum field angle of the optical lens, d78 is the air gap between the seventh lens and the eighth lens on the optical axis, R71 is the radius of curvature of the first side surface of the seventh lens, and R72 is the radius of curvature of the second side surface of the seventh lens. diameter, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, d23 is the air gap between the second lens and the third lens on the optical axis, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F7 is the effective focal length of the seventh lens, FOV is the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, BFL is the optical back focus of the optical lens, TL is the distance on the optical axis from the center of the first side surface of the first lens to the center of the second side surface of the eighth lens, R11 is the curvature radius of the first side surface of the first lens, d34 is the air gap between the third lens and the fourth lens on the optical axis, R32 is the curvature radius of the second side surface of the third lens, and ENPD is the entrance pupil diameter of the optical lens. .

[0008] In one embodiment, the optical lens satisfies at least one of the following conditional expressions: 12.9677≤|F8 / F|≤1397.2671, 0.7891≤d8 / (d8+SAG82-SAG81)≤1.1869, 0.3074≤D / TTL≤0.3243, 0.1060≤(d2+d3) / TTL≤0.1835, 0.3202≤D82 / TTL≤0.3734, 0.0433≤d78 / TTL ≤0.1449, 0.0202≤R71 / R72≤0.9447, 2.4606≤R72 / d78≤384.4675, 0.5773≤|F5 / F6|≤2.6631, 0.0348≤d 23 / TTL≤0.1219, -1.3782≤F1 / F≤-1.1319, 4.0869≤F2 / F≤160.4574, 1.6770≤|F3 / F|≤23.1406, 1.2236 ≤F4 / F≤1.9881, 2.2311≤F7 / F≤15.3532, 1.4339≤|F56 / F|≤8.6395, 60.6630°≤(FOV×F) / H≤61.5807°, 0 .0088≤D / H / FOV×1°≤0.0093, 2.8638≤TTL / H≤2.9258, 0.0791≤BFL / TL≤0.1296, 16.2696≤|R11 / F|≤1.2 316E+17,0.1333≤(1 / F4+1 / F56+1 / F7) / (1 / F)≤1.2734,-9.3384≤R32 / F≤-1.1958,0.5965≤F / H≤0.605 5. 0.0033≤d34 / TTL≤0.0057, 4.8010≤TTL / F≤4.8396, 1.6400≤F / ENPD≤1.8501, 0.9334≤D82 / H≤1.0884.

[0009] The second aspect of the present application provides an electronic device. The electronic device includes the optical lens provided according to the present application, and also includes: at least one of an imaging element and a light source, wherein the imaging element is used to convert an optical image formed by the optical lens into an electrical signal, and the light emitted by the light source is projected onto a target area after passing through the optical lens to form an image or illuminate the area.

[0010] The optical lens provided in the exemplary embodiment of the present application includes eight lenses with optical power, and the optical power and surface shape of some lenses are reasonably distributed. The first lens is set to have a negative optical power, and the second side surface is a concave surface, which can effectively diverge the light; the second lens is matched with a positive lens to compress the light diverged by the first lens, so that the light can smoothly enter the rear optical system. The two are matched with each other, which is conducive to the first lens to better diverge the light, thereby reducing the front port diameter; the third lens is set to be concave and convex, and the light is further transferred to the fourth lens; the fourth lens is set to be a convex-convex lens with positive optical power, and the light that is generally divergent in the front is quickly converged, and the light trend is changed, so that the light is close to the optical axis. This is a key light turning point in this architecture, which is conducive to the light entering the rear optical system smoothly, reducing the rear port diameter, and improving the resolution quality. The fifth lens and the sixth lens form a cemented lens group, and the focal length F56 of the cemented lens group and the effective focal length F of the optical lens are controlled to meet: 1≤|F56 / F|≤15, which can better receive the light converging in front and smoothly transition the light to the seventh lens, so that the light is generally in a trend of gentle convergence, which is beneficial to improving the imaging quality while reducing the back port diameter. The light is generally in a trend of convergence from the fourth lens to the seventh lens, and the air interval d78 on the optical axis between the seventh lens and the eighth lens and the total optical length TTL of the optical lens are controlled to meet: 0.02≤d78 / TTL≤0.2, and the distance between the seventh lens and the eighth lens is appropriately increased, which is beneficial to reducing the back port diameter and achieving miniaturization; at the same time, it is beneficial to ease the converging light and smoothly enter the eighth lens, thereby improving the imaging quality. After the light is converged by the seventh lens, it reaches the eighth lens. The effective focal length F8 of the eighth lens and the effective focal length F of the optical lens are controlled to meet: |F8 / F|≥9, so that the focal length of the eighth lens is larger, which is conducive to the smooth transition of light, reducing the sensitivity of the system and improving the imaging quality; the eighth lens has a small deflection angle of light, which is conducive to the light being nearly perpendicular to the imaging surface and reducing CRA. Therefore, by satisfying 1≤|F56 / F|≤15, 0.02≤d78 / TTL≤0.2 and |F8 / F|≥9, and by controlling the relevant parameters of the fifth lens to the eighth lens of the lens, it is conducive to the optical lens to achieve the characteristics of small aperture at the back end, miniaturization, high resolution and small CRA.

[0011] In addition, the optical lens provided in the present application uses eight lenses. By optimizing the shape, optical power, etc. of each lens, the optical lens has at least one beneficial effect of miniaturization, small aperture, large field of view, long focal length, weak ghost images, high resolution, small CRA, high illumination and good temperature performance, so that the optical lens can better meet the high requirements of vehicle-mounted applications (for example, automatic driving assistance systems). BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings. In the drawings: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13 , Fig.14 , Fig.15 , Fig.16 , Fig.17 , Fig.18 , Fig.19 , Fig. 20 The schematic diagrams of the structures of the optical lenses according to Embodiments 1 to 20 of the present application are shown respectively; Fig.21 , Fig. 22 , Fig.23 , Fig.24 , Fig.25 , Fig.26 , Fig. 27 , Fig.28 The modulation transfer function curves of the optical lenses according to Examples 1 to 8 of the present application are respectively shown. DETAILED DESCRIPTION

[0013] In order to facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant 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 figure numbers refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0014] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0015] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0016] It should be understood that the optical lens provided in the present application can be used for both video and projection, and can also be used for laser radar lenses. When the optical lens provided in the present application is used for a camera lens or a laser radar receiving end lens, the "first side" referred to in this article may refer to the object side, and the "second side" may refer to the image side. The light from the object side can be imaged on the image side, for example, wherein the camera lens can be, for example, a vehicle-mounted camera, an infrared camera, a drone camera, a night vision camera, a security monitoring camera, etc.; when the optical lens provided in the present application is used for a projection lens or a radar transmitting end lens, the "first side" referred to in this article may refer to the object side, and the "second side" may refer to the light source side. The light source side can provide light with or without image information. The light from the light source side passes through the optical lens and is projected to the first side, for example, forming an image or illuminating an area on the first side.

[0017] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface type in the paraxial region can be judged according to the general method in the art, for example, the positive and negative R value (R refers to the radius of curvature of the paraxial region) is used to judge the concave and convex. Exemplarily, the positive and negative numerical signs of the radius of curvature of each surface in the parameter table of each lens of the optical lens (for example, Table 1, Table 3, Table 5, etc.) only indicate the curvature direction of the surface. For the first side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the second side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0018] In this article, the positive and negative values ​​of the thickness / distance of each surface in the parameter tables of each lens of the optical lens (e.g., Table 1, Table 3, Table 5, etc.) only indicate the direction, not the size. For example, the direction from the first side to the second side along the optical axis is defined as the positive direction, and the direction from the second side to the first side along the optical axis is defined as the negative direction. The thickness / distance of a row where a surface is located indicates the distance from the surface to the next surface. The thickness / distance of the row where S1 is located is the distance from S1 to S2 on the optical axis (i.e., the center thickness of the first lens L1 on the optical axis), the thickness / distance of the row where S2 is located is the distance from S2 to S3 on the optical axis (i.e., the spacing distance between the second side surface S2 of the first lens L1 and the first side surface S3 of the second lens L2), the thickness / distance of the row where S3 is located is the distance from S3 to S4 on the optical axis (i.e., the center thickness of the second lens L2 on the optical axis), and so on. If the direction from this surface to the next surface is consistent with the positive direction, the thickness / distance is a positive number; if the direction from this surface to the next surface is consistent with the negative direction, the thickness / distance is a negative number. For example, the thickness / distance of the row where S6 is located is the distance from S6 to STO on the optical axis. The distance in Table 1 is -0.6673, which means that the direction from S6 to STO is along the negative direction, and STO is located on the first side of S6. Similarly, when the direction from the first side to the second side along the optical axis is defined as the positive direction, and the direction from the second side to the first side along the optical axis is defined as the negative direction, the positive and negative numerical signs of the vector heights (such as SAG81, SAG82) involved in this application only indicate the direction, not the size.

[0019] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0020] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] The features, principles and other aspects of the present application are described in detail below.

[0023] In an exemplary embodiment, the optical lens includes, for example, eight lenses having optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, which are arranged in sequence from the first side to the second side along the optical axis.

[0024] In an exemplary embodiment, the optical lens provided by the present application can be used as, for example, a vehicle-mounted lens or a laser radar receiving end lens. In this case, the first side of the optical lens can be the object side, and the second side can be the image side. Light from the object side can be imaged on the image side. The second side of the optical lens can be provided with an imaging surface of the optical lens. In this case, TTL is the distance from the center of the first side surface (object side surface) of the first lens to the imaging surface of the optical lens on the optical axis. BFL is the distance from the center of the second side surface (image side surface) of the eighth lens to the imaging surface on the optical axis.

[0025] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the second side surface. Optionally, the photosensitive element disposed on the second side surface may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0026] In an exemplary embodiment, the optical lens provided in the present application can be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, the first side of the optical lens can be the object side, and the second side can be the light source side. The light from the light source side passes through the optical lens and is projected to the object side. For example, an image can be formed on the object side or an illuminated area can be illuminated. The second side of the optical lens can be provided with a light source surface of the optical lens. In this case, TTL is the distance from the center of the first side surface of the first lens to the light source surface of the optical lens on the optical axis. BFL is the distance from the center of the second side surface of the eighth lens to the light source surface on the optical axis.

[0027] In an exemplary embodiment, an aperture may be provided between the second lens and the third lens or between the third lens and the fourth lens. The aperture is provided between the second lens and the third lens or between the third lens and the fourth lens, which is conducive to effectively converging the light entering the optical lens, reducing the aperture size of the front lens of the optical lens, and reducing the assembly sensitivity of the system while increasing the amount of light passing. However, it should be noted that the position of the aperture disclosed here is only an example and not a limitation; in alternative embodiments, the aperture may also be provided at other positions according to actual needs.

[0028] In an exemplary embodiment, the first lens has negative optical power, and its first side surface is convex and its second side surface is concave. The first lens has negative optical power, and can collect and diverge light with a large field of view. Under the same field of view angle, the light emitted through the second side surface (image side surface) of the first lens can enable the subsequent optical system to have a larger light receiving surface. The first side surface (object side surface) of the first lens is convex, which can collect as much light as possible from a large field of view to enter the rear optical system, and in actual use environments such as rainy and snowy weather, it is conducive to the sliding of water droplets and reduces the impact on imaging. The second side surface (image side surface) of the first lens is concave, which can quickly diverge the large-angle light passing through the first side surface (object side surface) of the first lens, which is conducive to the aberration correction of large-angle light by the rear optical system to achieve high resolution.

[0029] In an exemplary embodiment, the first lens has negative optical power, and its first side surface is concave, and its second side surface is concave. The first lens has negative optical power, and can collect and diverge light of a large field of view. Under the same field of view angle, the light emitted through the second side surface (image side surface) of the first lens can enable the subsequent optical system to have a larger light receiving surface. The first side surface (object side surface) of the first lens is a concave surface, which can receive and diverge peripheral light with a smaller aperture, which is conducive to reducing the front port aperture and rapidly expanding the light beam to reduce the incident angle of the light of the rear lens, which is conducive to reducing the light sensitivity and achieving both telephoto and high resolution. The second side surface (image side surface) of the first lens is a concave surface, which can quickly diverge the large-angle light passing through the first side surface (object side surface) of the first lens, which is conducive to the aberration correction of the large-angle light by the rear optical system to achieve high resolution.

[0030] In an exemplary embodiment, the second lens has positive optical power, which can effectively compress the light diverged by the first lens, allowing the light to smoothly enter the rear optical system. The second lens is matched with the first lens, which helps the first lens to better diverge the light and thus reduce the front port diameter.

[0031] In an exemplary embodiment, the second lens has positive optical power, and its first side surface is convex, and its second side surface is convex. Both sides of the second lens are convex, which is conducive to further converging light, so that the light emitted by the second lens is closer to the optical axis, which is conducive to reducing the front and rear port diameters and achieving miniaturization.

[0032] In an exemplary embodiment, the second lens has positive optical power, and its first side surface is convex and its second side surface is concave. The first side surface (object side surface) of the second lens is convex, which further converges the light entering the second lens and reduces the front port diameter; the second side surface (image side surface) is concave, which can receive the light converged in front and diverge appropriately, which is conducive to increasing the amount of light passing and improving the illumination of the edge field of view.

[0033] In an exemplary embodiment, the second lens has positive focal power, and its first side surface is concave, and its second side surface is convex. The first side surface (object side) of the second lens is concave, which matches the concave surface of the second side surface (image side) of the first lens, which is conducive to the second lens to better receive the front light, so that the light transitions smoothly, reduces the light sensitivity, and improves the resolution quality; at the same time, it is also conducive to reducing light energy loss and improving the illumination of the peripheral field of view; the second side surface (image side) is convex, which is conducive to further converging the light, reducing the incident height of the large-angle light, and then reducing the diameter of the rear port of the lens, so as to achieve miniaturization of the lens.

[0034] In an exemplary embodiment, the third lens has negative optical power, and its first side surface is concave and the second side surface is convex. The third lens has negative optical power and can diverge the light converged by the second lens, dispersing the central light and the edge light of each field of view, which is beneficial to the regulation of light by the rear lens and improves the resolution quality. The first side surface (object side) of the third lens is concave, which can better receive the light in front, so that the incident angle of the light entering the third lens is smaller, which is beneficial to reduce the loss of light energy, reduce the light sensitivity, and improve the resolution quality; the second side surface (image side) of the third lens is convex, and with the concave surface of the first side surface (object side), the light can be smoothly emitted after passing through the third lens, which is beneficial to improve the field curvature and other off-axis aberrations.

[0035] In an exemplary embodiment, the third lens has positive optical power, and its first side surface is concave and the second side surface is convex. The third lens has positive optical power, which can share the convergence pressure of the second lens, which is beneficial to reduce light sensitivity and improve resolution quality; the second lens and the third lens are both positive optical power, which can continuously converge light, and is more conducive to achieving a small front aperture. The first side surface (object side) of the third lens is concave, which can better receive the light in front, and the incident angle of the light entering the third lens is small, which is beneficial to reduce light energy loss, reduce light sensitivity, and improve resolution quality; the second side surface (image side) of the third lens is convex, and with the concave surface of the first side surface (object side), the light can be smoothly emitted after passing through the third lens, which is beneficial to improve the field curvature and other off-axis aberrations.

[0036] In an exemplary embodiment, the fourth lens has positive focal length, and its first side is convex, and its second side is convex. The fourth lens has positive focal length, and can quickly converge the light that is generally divergent in the front, change the light trend, and deflect the light in the direction of the optical axis. This is a key light turning point in the architecture of the optical lens of the present application, which is conducive to the smooth entry of light into the rear optical system, reducing the rear port diameter, and improving the resolution quality. The first side (object side) of the fourth lens is convex, which has a converging effect on the light, can further reduce aberrations, is conducive to achieving high resolution, and improves the resolution ability of the optical system; the second side (image side) of the fourth lens is convex, and the edge field light continues to converge after passing through the fourth lens, which is conducive to reducing the rear port diameter and achieving miniaturization, while making the rear end light trend stable, reducing light sensitivity, and improving resolution quality.

[0037] In an exemplary embodiment, the fifth lens has positive power, and its first side surface is convex, and its second side surface is convex. The fifth lens has positive power and is biconvex in shape, which further converges the front light and makes the light transition smooth, thereby generating less aberration, which is conducive to achieving rear-end miniaturization and high resolution, and improving the resolution capability of the optical system.

[0038] In an exemplary embodiment, the fifth lens has negative optical power, and its first side surface is convex and its second side surface is concave. The fifth lens has negative optical power and a convex-concave shape, which can effectively receive the light converging in front, reduce the degree of deflection of the light, facilitate the smooth passage of light, reduce light energy loss, improve relative illumination, and reduce system sensitivity.

[0039] In an exemplary embodiment, the fifth lens has negative optical power, and its first side surface is concave, and its second side surface is concave. The fifth lens has negative optical power and a concave-concave shape, which can properly diverge the light converging in front, increase the distance between the edge light, make the edge light effectively diverge, improve the peripheral illumination, and achieve large image plane imaging.

[0040] In an exemplary embodiment, the sixth lens has negative optical power, and its first side surface is concave and its second side surface is convex. The sixth lens has negative optical power and a concave-convex shape, and can receive the light continuously converged by the fourth lens and the fifth lens and properly diverge it, so that the light can be emitted smoothly, which is conducive to improving aberrations and achieving high resolution.

[0041] In an exemplary embodiment, the sixth lens has negative optical power, and its first side surface is concave, and its second side surface is concave. The sixth lens has negative optical power and a concave-concave shape, receives the light continuously converged by the fourth lens and the fifth lens and further diverges the light, increases the distance between the edge light, makes the edge light effectively diverge, improves the peripheral illumination, and realizes large image plane imaging.

[0042] In an exemplary embodiment, the sixth lens has positive power, a first side surface thereof is convex, and a second side surface thereof is convex. The sixth lens has positive power and a biconvex shape, which can appropriately converge the light rays smoothly transitioning in front, is conducive to achieving rear-end miniaturization and high resolution, and improves the resolution capability of the optical system.

[0043] In an exemplary embodiment, the seventh lens has positive power, and its first side surface is convex and its second side surface is concave. The seventh lens has positive power, further converges the front light, which is conducive to a small rear aperture and realizes miniaturization of the lens. On the basis of realizing a small rear aperture, the first side surface (object side) of the seventh lens is a convex surface, which effectively converges the light, and is matched with a concave surface on the second side surface (image side), which receives the light and appropriately diverges the light, increases the distance between the edge light and the optical axis, effectively diverges the edge light, and improves the edge illumination of the lens.

[0044] In an exemplary embodiment, the eighth lens has negative optical power, and can diverge the light from the seventh lens, further diverge the light trend, increase the illumination of the peripheral field of view, and improve the resolution quality.

[0045] In an exemplary embodiment, the eighth lens has negative optical power, and its first side surface is convex and its second side surface is concave. The first side surface (object side surface) of the eighth lens is convex, which makes the incident angle of light smaller, which is conducive to more light entering the optical system and achieving high-throughput effect; at the same time, it is conducive to converging light, so that the light reaches the image plane quickly, which is conducive to reducing the total optical length and achieving miniaturization. The second side surface (image side surface) of the eighth lens is concave, which can diverge the central light so that the light can reach a higher imaging position. At the same time, the first side surface and / or the second side surface of the eighth lens can have an inflection point, so that the peripheral light can be converged, thereby reducing the incident angle of light entering the chip, which helps to improve the illumination and reduce the CRA, and improve the imaging quality.

[0046] In an exemplary embodiment, the eighth lens has negative optical power, and its first side surface is concave, and its second side surface is concave. The first side surface (object side surface) of the eighth lens is concave, which can diverge the light converging in front, reduce the optical path difference, and improve the imaging quality; the second side surface (image side surface) of the eighth lens is concave, which can diverge the central light, so that the light can reach a higher imaging position, and at the same time, the first side surface and / or the second side surface of the eighth lens can have an inflection point, so that the peripheral light can be converged, thereby reducing the incident angle of the light entering the chip, which helps to improve the illumination and reduce the CRA, and improve the imaging quality.

[0047] In an exemplary embodiment, the eighth lens has negative optical power, and its first side surface is concave and its second side surface is convex. The first side surface (object side surface) of the eighth lens is concave, which diverges the light rays converging in front, so that the light rays can reach a higher imaging position, realize imaging on a large image plane, and improve the imaging quality; the second side surface (image side surface) of the eighth lens is convex, which appropriately converges the light rays diverging through the first side surface (object side surface), and realizes a small aperture at the rear end while satisfying high resolution.

[0048] In an exemplary embodiment, the eighth lens has positive optical power, and further converges the light, thereby reducing the distance from the light to the imaging surface, achieving miniaturization, reducing light loss, and improving imaging quality.

[0049] In an exemplary embodiment, the eighth lens has positive focal power, and its first side surface is convex and its second side surface is concave. The first side surface (object side surface) of the eighth lens is convex, which makes the incident angle of light smaller, which is conducive to more light entering the optical system and achieving high-throughput effect; at the same time, it is conducive to converging light, so that the light quickly reaches the image plane, which is conducive to reducing the total optical length and achieving miniaturization. The second side surface (image side surface) of the eighth lens is concave, which diverges the central light so that the light can reach a higher imaging position. At the same time, the first side surface and / or the second side surface of the eighth lens may have an inflection point, so that the peripheral light is converged, thereby reducing the incident angle of light entering the chip, which helps to improve the illumination and reduce the CRA, and improve the imaging quality.

[0050] In an exemplary embodiment, the eighth lens has positive focal power, and its first side surface is convex and its second side surface is concave. The first side surface (object side surface) of the eighth lens is convex, which makes the incident angle of light smaller, which is conducive to more light entering the optical system and achieving high-throughput effect; at the same time, it is conducive to converging light, so that the light quickly reaches the image plane, which is conducive to reducing the total optical length and achieving miniaturization. The second side surface (image side surface) of the eighth lens is convex, which further converges light and reduces the back port diameter.

[0051] In an exemplary embodiment, the eighth lens may be an aspherical lens, which is conducive to smoothly transitioning light to the imaging surface, correcting astigmatism and field curvature, and improving the resolution of the optical system. Furthermore, the first side surface and the second side surface of the eighth lens may have a recurve, which is conducive to balancing the aberration of the central field of view and the edge field of view, and improving the resolution.

[0052] In an exemplary embodiment, the optical lens may use at least two aspherical lenses. For example, at least two of the second lens, the third lens, and the eighth lens may be aspherical lenses. The curvature of each position of the aspherical surface is different, which is conducive to correcting the aberration of the system, improving the resolution capability, and especially reducing the aberration of the large field of view. The aspherical lens can realize the plasticization of the lens, and realize the cost reduction requirement without affecting the temperature performance.

[0053] In an exemplary embodiment, the fifth lens and the sixth lens form a cemented lens group, and the positive and negative properties of the optical power of the fifth lens and the sixth lens are opposite. After passing through the first lens and the second lens, the light tends to diverge, and transitions to the fourth lens through the third lens. The fourth lens can quickly converge the light to achieve a turning point in the light trend. At this time, more optical path differences will be introduced, making it difficult to completely eliminate chromatic aberration. The optical power and surface shape of the first lens to the fourth lens are reasonably matched, so that the light can enter the fifth lens more smoothly when it is emitted from the fourth lens. The fifth lens and the sixth lens form a cemented lens group, which is more conducive to correcting chromatic aberration, so that various aberrations of the optical system are fully corrected. Under the premise of compact structure, the resolution can be improved, and the optical performance such as distortion and CRA can be optimized. In addition, the cementation of the fifth lens and the sixth lens can effectively eliminate the influence of ghost images on the lens, so that the lens can ensure a high resolution quality on the basis of eliminating ghost images.

[0054] The present application forms a cemented lens group with the fifth lens and the sixth lens, which has at least the following technical effects: 1) The use of the cemented component allows the various aberrations of the optical system to be fully corrected, and under the premise of compact structure, the resolution can be improved, and the optical properties such as distortion and CRA can be optimized; 2) The negative lens in the cemented component has a higher refractive index (relative to the positive lens), so that the light can be effectively and smoothly converged at the end, so that the light can reach the imaging surface smoothly, reducing the overall weight and cost; 3) Reducing the light loss caused by reflection between lenses; the combination of high and low refractive indices of the fifth lens and the sixth lens is conducive to the rapid transition of the front light, increasing the aperture and improving the amount of light passing; 4) The use of the cemented component reduces the air gap between the two lenses, making the overall structure of the optical system compact, while reducing the tolerance sensitivity problems such as overall eccentricity of the lens unit caused by the assembly process.

[0055] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1≤|F56 / F|≤15, wherein F56 is the combined focal length of the fifth lens and the sixth lens, and F is the effective focal length of the optical lens. Satisfying 1≤|F56 / F|≤15 and rationally controlling the focal length F56 of the cemented lens group can better receive the light converging in front and smoothly transition the light to the seventh lens, so that the light as a whole tends to converge gently, which is beneficial to improving the imaging quality while reducing the back port diameter. More specifically, the optical lens may further satisfy 1.2≤|F56 / F|≤12, and may further satisfy 1.4339≤|F56 / F|≤8.6395, and the further range may better achieve high resolution and reduce the back port diameter.

[0056] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.02≤d78 / TTL≤0.2, wherein d78 is the air interval between the seventh lens and the eighth lens on the optical axis, and TTL is the total optical length of the optical lens. The light rays from the fourth lens to the seventh lens as a whole tend to converge, satisfying 0.02≤d78 / TTL≤0.2. Properly increasing the distance between the seventh lens and the eighth lens is conducive to reducing the diameter of the back port and achieving miniaturization; at the same time, it is conducive to alleviating the converged light rays, smoothly entering the eighth lens, and improving the imaging quality. More specifically, the optical lens may further satisfy 0.03≤d78 / TTL≤0.19, and may further satisfy 0.0433≤d78 / TTL≤0.1449, and the further range may better reduce the diameter of the back port and achieve miniaturization.

[0057] In an exemplary embodiment, the optical lens according to the present application may satisfy: |F8 / F|≥9, where F8 is the effective focal length of the eighth lens, and F is the effective focal length of the optical lens. After the light is converged by the seventh lens, it reaches the eighth lens, satisfying |F8 / F|≥9, so that the focal length of the eighth lens is larger, which is conducive to a smooth transition of light, reducing system sensitivity, and improving imaging quality; the eighth lens has a small light deflection angle, which is conducive to the light being approximately perpendicular to the imaging surface and reducing CRA. More specifically, the optical lens may further satisfy 10≤|F8 / F|≤2000, and may further satisfy 12.9677≤|F8 / F|≤1397.2671, and a further range may better achieve high resolution and small CRA.

[0058] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.05≤(d2+d3) / TTL≤0.25, wherein d2 is the center thickness of the second lens on the optical axis, d3 is the center thickness of the third lens on the optical axis, and TTL is the total optical length of the optical lens. When 0.05≤(d2+d3) / TTL≤0.25 is satisfied, the second lens and the third lens are thinner as a whole, and light can quickly pass through to the fourth lens for convergence, reducing light energy loss, improving imaging quality, and reducing the front end diameter to achieve miniaturization. More specifically, the optical lens may further satisfy 0.07≤(d2+d3) / TTL≤0.2, and may further satisfy 0.1060≤(d2+d3) / TTL≤0.1835, and the further range may better achieve small front end diameter and miniaturization.

[0059] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0<R71 / R72≤1.5, wherein R71 is the radius of curvature of the first side surface of the seventh lens, and R72 is the radius of curvature of the second side surface of the seventh lens. Satisfying 0<R71 / R72≤1.5, the seventh lens is a convex-concave type, and its radius of curvature is reasonably controlled so that the light is effectively converged after passing through the first side surface (object side surface) of the seventh lens, and smoothly diverges after passing through the second side surface (image side surface), which is conducive to increasing the distance between the edge light and the optical axis and the distance between the edge light rays, so that the edge light rays are effectively diverged, the relative illumination is improved, and the small aperture at the rear end is achieved. More specifically, the optical lens may further satisfy 0.01≤R71 / R72≤1, and may further satisfy 0.0202≤R71 / R72≤0.9447, and the further range may better improve the relative illumination and achieve the small aperture at the rear end.

[0060] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.4≤|F5 / F6|≤3, where F5 is the effective focal length of the fifth lens and F6 is the effective focal length of the sixth lens. Satisfying 0.4≤|F5 / F6|≤3 and reasonably matching the focal lengths of the positive and negative films in the glued component is conducive to smoothing the light in the glued component, reducing light energy loss, better correcting chromatic aberration, and improving resolution quality. More specifically, the optical lens may further satisfy 0.5≤|F5 / F6|≤2.8, and may further satisfy 0.5773≤|F5 / F6|≤2.6631, and further ranges may better improve resolution.

[0061] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.015≤d23 / TTL≤0.17, wherein d23 is the air spacing between the second lens and the third lens on the optical axis, and TTL is the total optical length of the optical lens. When 0.015≤d23 / TTL≤0.17 is satisfied, the light will diverge as a whole after passing through the first lens and the second lens. Controlling the air spacing between the second lens and the third lens is conducive to better divergence of the light and reducing the front port diameter. At the same time, the spacing should not be too large, so as to achieve short TTL on the basis of high resolution. More specifically, the optical lens may further satisfy 0.02≤d23 / TTL≤0.16, and may further satisfy 0.0348≤d23 / TTL≤0.1219. The further range may better achieve miniaturization while taking into account high resolution.

[0062] In an exemplary embodiment, the optical lens according to the present application may satisfy: F2 / F≥2.5, where F2 is the effective focal length of the second lens, and F is the effective focal length of the optical lens. When F2 / F≥2.5 is satisfied, the light rays converge smoothly after passing through the second lens, which is conducive to the smooth transition of the light rays to the third lens, reduces light sensitivity, reduces light energy loss, and improves resolution quality. More specifically, the optical lens may further satisfy 3≤F2 / F≤260, and may further satisfy 4.0869≤F2 / F≤160.4574, and a further range may better achieve high resolution.

[0063] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.6≤d8 / (d8+SAG82-SAG81)≤1.5, wherein d8 is the center thickness of the eighth lens on the optical axis, SAG82 is the distance from the intersection of the second side surface of the eighth lens and the optical axis to the effective radius vertex of the second side surface of the eighth lens on the optical axis, and SAG81 is the distance from the intersection of the first side surface of the eighth lens and the optical axis to the effective radius vertex of the first side surface of the eighth lens on the optical axis. Satisfying 0.6≤d8 / (d8+SAG82-SAG81)≤1.5 makes the lens proportions of the eighth lens uniform, the overall shape relatively flat, the overall moment is small when subjected to radial force, the thermal expansion and contraction changes are uniform, and the temperature performance is good. More specifically, the optical lens can further satisfy 0.7≤d8 / (d8+SAG82-SAG81)≤1.3, and can further satisfy 0.7891≤d8 / (d8+SAG82-SAG81)≤1.1869. The further range can better ensure the temperature performance of the lens and improve the imaging quality.

[0064] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.25≤D / TTL≤0.37, wherein D is the maximum aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, and TTL is the total optical length of the optical lens. Satisfying 0.25≤D / TTL≤0.37, controlling the ratio of D to TTL, and achieving short TTL and high resolution while satisfying the small aperture at the front end. More specifically, the optical lens may further satisfy 0.30≤D / TTL≤0.33, and may further satisfy 0.3074≤D / TTL≤0.3243, and further ranges may better achieve miniaturization and high resolution.

[0065] In an exemplary embodiment, the optical lens according to the present application may satisfy: R72 / d78≥1.5, wherein R72 is the radius of curvature of the second side of the seventh lens, and d78 is the air gap between the seventh lens and the eighth lens on the optical axis. Satisfying R72 / d78≥1.5, the second side of the seventh lens is concave and relatively flat, which is conducive to the smooth divergence of light to the eighth lens, reducing system sensitivity, and improving imaging quality. In combination with controlling the air gap between the seventh lens and the eighth lens, the edge light can be effectively diverged, improving edge illumination. More specifically, the optical lens may further satisfy 2≤R72 / d78≤600, and may further satisfy 2.4606≤R72 / d78≤384.4675, and the further range may better achieve high resolution and high relative illumination.

[0066] In an exemplary embodiment, the optical lens according to the present application may satisfy: -2≤F1 / F≤-0.5, where F1 is the effective focal length of the first lens, and F is the effective focal length of the optical lens. When -2≤F1 / F≤-0.5 is satisfied, the focal length of the first lens is relatively small, which is conducive to collecting light with a large field of view. After the light is diverged by the first lens, it can enter the rear optical system well, realizing the telephoto feature. More specifically, the optical lens may further satisfy -1.5≤F1 / F≤-1.1, and may further satisfy -1.3782≤F1 / F≤-1.1319, and the further range may better realize the large field of view and telephoto features.

[0067] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.8≤F4 / F≤2.5, where F4 is the effective focal length of the fourth lens, and F is the effective focal length of the optical lens. When 0.8≤F4 / F≤2.5 is satisfied, the focal length of the fourth lens is positive and small, which plays a key converging role in the entire optical system, allowing light to smoothly enter the rear optical system, compressing the rear port diameter, and achieving miniaturization while meeting high resolution. More specifically, the optical lens may further satisfy 1≤F4 / F≤2.2, and may further satisfy 1.2236≤F4 / F≤1.9881, and further ranges may better achieve high resolution and small aperture.

[0068] In an exemplary embodiment, the optical lens according to the present application may satisfy: D / H / FOV×1°≤0.015, wherein D is the maximum clear aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, and FOV is the maximum field of view of the optical lens. Satisfying D / H / FOV×1°≤0.015 and rationally controlling D, H, and FOV are conducive to achieving high resolution while realizing a small front-end aperture that takes into account a large field of view and a large image surface. More specifically, the optical lens may further satisfy 0.008≤D / H / FOV×1°≤0.01, and may further satisfy 0.0088≤D / H / FOV×1°≤0.0093, and the further range may better achieve high resolution while realizing a small front-end aperture that takes into account a large field of view and a large image surface.

[0069] In an exemplary embodiment, the optical lens according to the present application may satisfy: |R11 / F|≥20, where R11 is the radius of curvature of the first side of the first lens, and F is the effective focal length of the optical lens. Satisfying |R11 / F|≥20, controlling the radius of curvature of the first side of the first lens can make the pupil image of the ghost image away from the focal plane, so that the ghost image light on the image plane is relatively divergent, effectively reducing the relative energy value of the ghost image, and improving the quality of the lens imaging picture. More specifically, the optical lens may further satisfy |R11 / F|≥25, and may further satisfy 16.2696≤|R11 / F|≤1.2316E+17, and further ranges may better achieve weak ghost images.

[0070] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.05≤(1 / F4+1 / F56+1 / F7) / (1 / F)≤2, wherein F4 is the effective focal length of the fourth lens, F56 is the combined focal length of the fifth lens and the sixth lens, F7 is the effective focal length of the seventh lens, and F is the effective focal length of the optical lens. Satisfying 0.05≤(1 / F4+1 / F56+1 / F7) / (1 / F)≤2, the optical power of the fourth lens to the seventh lens is reasonably set, so that the light passes through the fourth lens to the seventh lens more smoothly, the light can be effectively and continuously converged, the light energy loss is reduced, the system sensitivity is reduced, and the resolution quality is improved. More specifically, the optical lens can further satisfy 0.07≤(1 / F4+1 / F56+1 / F7) / (1 / F)≤1.8, and can further satisfy 0.1333≤(1 / F4+1 / F56+1 / F7) / (1 / F)≤1.2734. The further range can better reduce the system sensitivity and improve the resolution.

[0071] In an exemplary embodiment, the optical lens according to the present application may satisfy: 3.5≤TTL / F≤6.5, where TTL is the total optical length of the optical lens and F is the effective focal length of the optical lens. Satisfying 3.5≤TTL / F≤6.5 and rationally controlling TTL and F are conducive to achieving both miniaturization and telephoto. More specifically, the optical lens may further satisfy 4.5≤TTL / F≤5, and may further satisfy 4.8010≤TTL / F≤4.8396, and a further range may better achieve both miniaturization and telephoto.

[0072] In an exemplary embodiment, the optical lens according to the present application may satisfy: d34 / TTL≤0.01, wherein d34 is the air spacing between the third lens and the fourth lens on the optical axis, and TTL is the total optical length of the optical lens. Satisfying d34 / TTL≤0.01 and controlling the spacing between the third lens and the fourth lens to be smaller, on the one hand, is conducive to the compact structure of the front lens, leaving a larger adjustment space for the design of the rear lens to meet the requirements of miniaturization and high resolution; on the other hand, the light can quickly enter the fourth lens after passing through the third lens, reducing light energy loss and increasing light throughput. More specifically, the optical lens may further satisfy 0.002≤d34 / TTL≤0.006, and may further satisfy 0.0033≤d34 / TTL≤0.0057, and the further range may better achieve miniaturization and high resolution, and increase light throughput.

[0073] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.29≤D82 / TTL≤0.4, wherein D82 is the maximum aperture of the second side of the eighth lens corresponding to the maximum field of view of the optical lens, and TTL is the total optical length of the optical lens. Satisfying 0.29≤D82 / TTL≤0.4, controlling the ratio of D82 to TTL, and achieving short TTL and high resolution while satisfying the small aperture at the rear end. More specifically, the optical lens may further satisfy 0.3≤D82 / TTL≤0.39, and may further satisfy 0.3202≤D82 / TTL≤0.3734, and the further range may better achieve miniaturization and high resolution.

[0074] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1≤|F3 / F|≤40, where F3 is the effective focal length of the third lens, and F is the effective focal length of the optical lens. Satisfying 1≤|F3 / F|≤40 and rationally controlling the focal length of the third lens is conducive to the smooth entry of light into the fourth lens, thereby improving the resolution quality. More specifically, the optical lens may further satisfy 1.3≤|F3 / F|≤35, and may further satisfy 1.6770≤|F3 / F|≤23.1406, and a further range may better achieve high resolution.

[0075] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1≤F7 / F≤25, where F7 is the effective focal length of the seventh lens, and F is the effective focal length of the optical lens. The focal length of the seventh lens is positive, which can effectively converge light, satisfying 1≤F7 / F≤25, and reasonably controlling the focal length of the seventh lens so that light enters the eighth lens smoothly, reducing light energy loss, and improving imaging quality while achieving a small aperture at the rear end. More specifically, the optical lens may further satisfy 1.5≤F7 / F≤20, and may further satisfy 2.2311≤F7 / F≤15.3532, and a further range may better achieve high resolution.

[0076] In an exemplary embodiment, the optical lens according to the present application may satisfy: 55°≤(FOV×F) / H≤70°, wherein FOV is the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, and F is the effective focal length of the optical lens. Satisfying 55°≤(FOV×F) / H≤70° and rationally controlling FOV, F, and H are conducive to achieving telephoto and large field of view while meeting high resolution. More specifically, the optical lens may further satisfy 58°≤(FOV×F) / H≤65°, and may further satisfy 60.6630°≤(FOV×F) / H≤61.5807°, and the further range may better achieve high resolution, telephoto, and large field of view.

[0077] In an exemplary embodiment, the optical lens according to the present application may satisfy: 2.5≤TTL / H≤3.5, wherein TTL is the total optical length of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens. Satisfying 2.5≤TTL / H≤3.5 and rationally controlling TTL and H are beneficial to the optical system in meeting high resolution and miniaturization. More specifically, the optical lens may further satisfy 2.8≤TTL / H≤3, and may further satisfy 2.8638≤TTL / H≤2.9258, and the further range may better achieve high resolution and miniaturization.

[0078] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.06≤BFL / TL≤0.16, wherein BFL is the optical back focus of the optical lens, and TL is the distance on the optical axis from the center of the first side surface of the first lens to the center of the second side surface of the eighth lens. Satisfying 0.06≤BFL / TL≤0.16 and rationally controlling BFL and TL are conducive to flexible adjustment of the center thickness and air spacing of the lens, achieving miniaturization while taking into account a suitable back focus. More specifically, the optical lens may further satisfy 0.065≤BFL / TL≤0.15, and may further satisfy 0.0791≤BFL / TL≤0.1296, and a further range may better achieve miniaturization while taking into account a suitable back focus.

[0079] In an exemplary embodiment, the optical lens according to the present application may satisfy: -17≤R32 / F≤-0.5, wherein R32 is the radius of curvature of the second side of the third lens, and F is the effective focal length of the optical lens. Satisfying -17≤R32 / F≤-0.5, controlling the second side of the third lens to be convex, and the radius of curvature value to be within a certain range, is conducive to the proper convergence of the divergent light in front to the fourth lens, so that the convergence of the light reaching the fourth lens can be relatively smooth, reducing light sensitivity and improving imaging quality. More specifically, the optical lens may further satisfy -14≤R32 / F≤-0.8, and may further satisfy -9.3384≤R32 / F≤-1.1958, and a further range may better achieve high resolution.

[0080] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.45≤F / H≤0.7, where F is the effective focal length of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens. Satisfying 0.45≤F / H≤0.7 and rationally controlling F and H are beneficial to the optical system in satisfying both high resolution and telephoto. More specifically, the optical lens may further satisfy 0.5≤F / H≤0.65, and may further satisfy 0.5965≤F / H≤0.6055, and the further range may better achieve both high resolution and telephoto.

[0081] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1.4≤F / ENPD≤2, where F is the effective focal length of the optical lens, and ENPD is the entrance pupil diameter of the optical lens. Satisfying 1.4≤F / ENPD≤2, achieving a small FNO is conducive to increasing the amount of light passing through, and a large entrance pupil diameter helps to improve relative illumination. More specifically, the optical lens may further satisfy 1.6≤F / ENPD≤1.9, and may further satisfy 1.6400≤F / ENPD≤1.8501, and a further range may better achieve a small FNO and a high amount of light passing through.

[0082] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.8≤D82 / H≤1.2, wherein D82 is the maximum clear aperture of the second side of the eighth lens corresponding to the maximum field angle of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens. Satisfying 0.8≤D82 / H≤1.2 makes the clear aperture of the second side of the eighth lens close to the image height, and the light deflection is small, which is conducive to achieving a small CRA. More specifically, the optical lens may further satisfy 0.85≤D82 / H≤1.1, and may further satisfy 0.9334≤D82 / H≤1.0884, and a further range may better achieve a small CRA.

[0083] In an exemplary embodiment, as needed, the optical lens of the present application may further include a filter and / or a protective glass disposed between the eighth lens and the imaging surface, the filter may filter light with different wavelengths, and the protective glass may prevent the elements (e.g., chip) on the second side of the optical lens from being damaged.

[0084] In an exemplary embodiment, the first lens to the eighth lens may be a spherical lens or an aspherical lens. The present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When focusing on imaging quality, the number of aspherical lenses can be increased, or even all lenses use aspherical lenses. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens. The setting of an aspherical lens helps to correct system aberrations and improve resolution.

[0085] In an exemplary embodiment, the first lens to the eighth lens may be a glass lens or a plastic lens. The present application does not specifically limit the specific number of glass lenses and plastic lenses. An optical lens made of glass can suppress the deviation of the back focus of the optical lens with temperature changes to improve the stability of the system. At the same time, the use of glass material can avoid problems such as lens imaging blur caused by high and low temperature changes in the use environment and affecting the normal use of the lens. Specifically, when focusing on temperature performance, the first lens to the eighth lens can all be made of glass. In applications where temperature stability requirements are lower, the first lens to the eighth lens in the optical lens can also be made of plastic. Making optical lenses with plastic can effectively reduce production costs. Of course, the first lens to the eighth lens in the optical lens can also be made of a combination of plastic and glass.

[0086] According to the optical lens of the above-mentioned embodiment of the present application, by reasonably setting parameters such as the shape of each lens and the optical focal length, the optical lens can achieve at least one beneficial effect such as miniaturization, small aperture, large field of view, long focal length, weak ghost image, high resolution, small CRA, high illumination and good temperature performance.

[0087] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the lens can be changed to obtain the various results and advantages described in this specification. For example, although eight lenses are described as an example in the embodiment, the optical lens is not limited to including eight lenses. If necessary, the optical lens may also include other numbers of lenses.

[0088] MTF stands for modulation transfer function, which describes the ability of an optical system to "restore" the object side in the image side. The horizontal axis of the modulation transfer function (MTF) curve is the spatial frequency, and the unit of the spatial frequency is line pairs per millimeter (lp / mm). The vertical axis is the optical modulation function value (i.e., MTF value). The MTF curve of the central field of view of the optical lens provided in this application has an MTF value of more than 0.72 at 119lp / mm, which can meet the required image quality requirements. It should be noted that the optical lenses provided in Examples 1 to 20 of this application can meet the high resolution capability of 8M (eight million) pixels, and their modulation transfer function (MTF) curves are relatively close. Therefore, only the modulation transfer function (MTF) curves of Examples 1 to 8 are exemplarily shown in this application. As for the modulation transfer function (MTF) curves of other embodiments, they are no longer shown one by one, and those skilled in the art should also be able to know based on the content disclosed in this application.

[0089] Specific embodiments of the optical lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0090] Example 1

[0091] The following reference Figure 1 An optical lens according to Embodiment 1 of the present application is described.

[0092] like Figure 1 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8 in sequence from the first side to the second side along the optical axis.

[0093] The first lens L1 is a concave-concave lens with negative focal power, whose first side surface S1 is concave, and whose second side surface S2 is concave. The second lens L2 is a convex-convex lens with positive focal power, whose first side surface S3 is convex, and whose second side surface S4 is convex. The third lens L3 is a concave-convex lens with negative focal power, whose first side surface S5 is concave, and whose second side surface S6 is convex. The fourth lens L4 is a convex-convex lens with positive focal power, whose first side surface S7 is convex, and whose second side surface S8 is convex. The fifth lens L5 is a convex-convex lens with positive focal power, whose first side surface S9 is convex, and whose second side surface S10 is convex. The sixth lens L6 is a concave-convex lens with negative focal power, whose first side surface S10 is concave, and whose second side surface S11 is convex. The seventh lens L7 is a convex-concave lens with positive focal power, whose first side surface S12 is convex, and whose second side surface S13 is concave. The eighth lens L8 is a convex-concave lens with positive refractive power, wherein the first side surface S14 is a convex surface, and the second side surface S15 is a concave surface.

[0094] The fifth lens L5 and the sixth lens L6 form a doublet lens group.

[0095] The optical lens may further include a stop STO, and the stop STO may be disposed between the third lens L3 and the fourth lens L4. Optionally, the optical lens may further include a filter and / or a protective glass having a first side surface S16 and a second side surface S17.

[0096] Table 1 shows the radius of curvature R, thickness / distance (it should be understood that the thickness / distance of the row where S1 is located is the center thickness of the first lens L1, the thickness / distance of the row where S2 is located is the spacing distance between the second side surface S2 of the first lens L1 and the first side surface S3 of the second lens L2, the thickness / distance of the row where S3 is located is the center thickness of the second lens L2, and so on), refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 1.

[0097] Table 1

[0098] In Example 1, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S14 and the second side surface S15 of the eighth lens L8 may be aspherical surfaces, and the second side surface S4 of the second lens L2, the first side surface S14 and the second side surface S15 of the eighth lens L8 have recurves. The surface shape of each aspherical lens may be defined by, but not limited to, the following aspherical surface formula: (1) Wherein, x is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface in Example 1.

[0099] Table 2

[0100] like Fig.21 As shown, the MTF value of the central field of view of the optical lens of Example 1 at a spatial frequency of 119lp / mm exceeds 0.72, and the optical lens provided in Example 1 has a relatively high resolution.

[0101] Example 2

[0102] The following reference Figure 2 The optical lens according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted.

[0103] like Figure 2 As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1 with negative optical power, a second lens L2 with positive optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with negative optical power, a seventh lens L7 with positive optical power, and an eighth lens L8 with positive optical power. The surface shape of each lens can be obtained according to the data in Table 3, and no further description is given. Table 3 shows the parameters of each lens of the optical lens of Example 2. Table 4 shows the parameters of each aspherical mirror surface that can be used in Example 2, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The first side surface S14 and the second side surface S15 of the eighth lens L8 have a reverse curve.

[0104] Table 3

[0105] Table 4

[0106] like Fig. 22 As shown, the MTF value of the central field of view of the optical lens of Example 2 at a spatial frequency of 119lp / mm exceeds 0.72, and the optical lens provided in Example 2 has a relatively high resolution.

[0107] Example 3

[0108] like Figure 3 As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1 with negative focal power, a second lens L2 with positive focal power, a third lens L3 with positive focal power, a fourth lens L4 with positive focal power, a fifth lens L5 with positive focal power, a sixth lens L6 with negative focal power, a seventh lens L7 with positive focal power, and an eighth lens L8 with negative focal power. The aperture STO can be arranged between the second lens L2 and the third lens L3. The surface shape of each lens can be obtained according to the data in Table 5, which will not be repeated. Table 5 shows the parameters of each lens of the optical lens of Example 3. Table 6 shows the parameters of each aspherical mirror surface that can be used in Example 3, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The first side surface S14 and the second side surface S15 of the eighth lens L8 have a reverse curve.

[0109] Table 5

[0110] Table 6

[0111] like Fig.23 As shown, the MTF value of the central field of view of the optical lens of Example 3 at the spatial frequency of 119lp / mm exceeds 0.8, and the optical lens provided in Example 3 has a high resolution.

[0112] Example 4

[0113] like Figure 4 As shown, the optical lens includes, from the first side to the second side along the optical axis: a first lens L1 with negative focal power, a second lens L2 with positive focal power, a third lens L3 with positive focal power, a fourth lens L4 with positive focal power, a fifth lens L5 with positive focal power, a sixth lens L6 with negative focal power, a seventh lens L7 with positive focal power and an eighth lens L8 with negative focal power. The aperture STO can be arranged between the second lens L2 and the third lens L3. The surface shape of each lens can be obtained according to the data in Table 7, which will not be repeated. Table 7 shows the parameters of each lens of the optical lens of Example 4. Table 8 shows the parameters of each aspherical mirror surface that can be used in Example 4, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The first side surface S14 and the second side surface S15 of the eighth lens L8 have a reverse curve.

[0114] Table 7

[0115] Table 8

[0116] like Fig.24 As shown, the MTF value of the central field of view of the optical lens of Example 4 at a spatial frequency of 119lp / mm exceeds 0.81, and the optical lens provided in Example 4 has a relatively high resolution.

[0117] Example 5

[0118] like Figure 5As shown, the optical lens includes, from the first side to the second side along the optical axis: a first lens L1 with negative focal power, a second lens L2 with positive focal power, a third lens L3 with positive focal power, a fourth lens L4 with positive focal power, a fifth lens L5 with positive focal power, a sixth lens L6 with negative focal power, a seventh lens L7 with positive focal power and an eighth lens L8 with positive focal power. The aperture STO can be arranged between the second lens L2 and the third lens L3. The surface shape of each lens can be obtained according to the data in Table 9, which will not be repeated. Table 9 shows the parameters of each lens of the optical lens of Example 5. Table 10 shows the parameters of each aspherical mirror surface that can be used in Example 5, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The first side surface S14 and the second side surface S15 of the eighth lens L8 have a reverse curve.

[0119] Table 9

[0120] Table 10

[0121] like Fig.25 As shown, the MTF value of the central field of view of the optical lens of Example 5 at the spatial frequency of 119lp / mm exceeds 0.79, and the optical lens provided in Example 5 has a relatively high resolution.

[0122] Example 6

[0123] like Figure 6 As shown, the optical lens includes, from the first side to the second side along the optical axis: a first lens L1 with negative focal power, a second lens L2 with positive focal power, a third lens L3 with positive focal power, a fourth lens L4 with positive focal power, a fifth lens L5 with positive focal power, a sixth lens L6 with negative focal power, a seventh lens L7 with positive focal power and an eighth lens L8 with positive focal power. The aperture STO can be arranged between the second lens L2 and the third lens L3. The surface shape of each lens can be known according to the data in Table 11, which will not be repeated. Table 11 shows the parameters of each lens of the optical lens of Example 6. Table 12 shows the parameters of each aspherical mirror surface that can be used in Example 6, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The first side surface S14 of the eighth lens L8 has a reverse curve.

[0124] Table 11

[0125] Table 12

[0126] like Fig.26As shown, the MTF value of the central field of view of the optical lens of Example 6 at a spatial frequency of 119lp / mm exceeds 0.79, and the optical lens provided in Example 6 has a relatively high resolution.

[0127] Example 7

[0128] like Figure 7 As shown, the optical lens includes, from the first side to the second side along the optical axis: a first lens L1 with negative optical power, a second lens L2 with positive optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with negative optical power, a sixth lens L6 with positive optical power, a seventh lens L7 with positive optical power and an eighth lens L8 with negative optical power. The surface shape of each lens can be obtained according to the data in Table 13, which will not be repeated. Table 13 shows the parameters of each lens of the optical lens of Example 7. Table 14 shows the parameters of each aspherical mirror surface that can be used in Example 7, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The second side surface S15 of the eighth lens L8 has a reverse curve.

[0129] Table 13

[0130] Table 14

[0131] like Fig. 27 As shown, the MTF value of the central field of view of the optical lens of Example 7 at the spatial frequency of 119lp / mm exceeds 0.74, and the optical lens provided in Example 7 has a relatively high resolution.

[0132] Example 8

[0133] like Figure 8 As shown, the optical lens includes, from the first side to the second side along the optical axis: a first lens L1 with negative optical power, a second lens L2 with positive optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with negative optical power, a sixth lens L6 with positive optical power, a seventh lens L7 with positive optical power, and an eighth lens L8 with negative optical power. The surface shape of each lens can be obtained according to the data in Table 15, which will not be repeated. Table 15 shows the parameters of each lens of the optical lens of Example 8. Table 16 shows the parameters of each aspherical mirror surface that can be used in Example 8, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0134] Table 15

[0135] Table 16

[0136] like Fig.28 As shown, the MTF value of the central field of view of the optical lens of Example 8 at the spatial frequency of 119lp / mm exceeds 0.73, and the optical lens provided in Example 8 has a relatively high resolution.

[0137] Example 9

[0138] like Fig. 9 As shown, the optical lens includes, from the first side to the second side along the optical axis: a first lens L1 with negative optical power, a second lens L2 with positive optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with negative optical power, a sixth lens L6 with positive optical power, a seventh lens L7 with positive optical power, and an eighth lens L8 with positive optical power. The surface shape of each lens can be obtained according to the data in Table 17, which will not be repeated. Table 17 shows the parameters of each lens of the optical lens of Example 9. Table 18 shows the parameters of each aspherical mirror surface that can be used in Example 9, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The second side surface S4 of the second lens L2, the first side surface S14 and the second side surface S15 of the eighth lens L8 have reverse curvature.

[0139] Table 17

[0140] Table 18

[0141] Example 10

[0142] like Fig.10 As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1 with negative optical power, a second lens L2 with positive optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with negative optical power, a sixth lens L6 with positive optical power, a seventh lens L7 with positive optical power, and an eighth lens L8 with positive optical power. The surface shape of each lens can be obtained according to the data in Table 19, which will not be repeated. Table 19 shows the parameters of each lens of the optical lens of Example 10. Table 20 shows the parameters of each aspherical mirror surface that can be used in Example 10, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The first side surface S14 and the second side surface S15 of the eighth lens L8 have a reverse curve.

[0143] Table 19

[0144] Table 20

[0145] Embodiment 11

[0146] like Fig.11 As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1 with negative optical power, a second lens L2 with positive optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with negative optical power, a seventh lens L7 with positive optical power, and an eighth lens L8 with negative optical power. The surface shape of each lens can be obtained according to the data in Table 21, and will not be repeated here. Table 21 shows the parameters of each lens of the optical lens of Example 11. Table 22 shows the parameters of each aspherical mirror surface that can be used in Example 11, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The second side surface S4 of the second lens L2, the first side surface S14 and the second side surface S15 of the eighth lens L8 have reverse curvature.

[0147] Table 21

[0148] Table 22

[0149] Example 12

[0150] like Fig.12 As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1 with negative optical power, a second lens L2 with positive optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with negative optical power, a seventh lens L7 with positive optical power, and an eighth lens L8 with negative optical power. The surface shape of each lens can be obtained according to the data in Table 23, and will not be repeated here. Table 23 shows the parameters of each lens of the optical lens of Example 12. Table 24 shows the parameters of each aspherical mirror surface that can be used in Example 12, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The second side surface S4 of the second lens L2, the first side surface S14 and the second side surface S15 of the eighth lens L8 have reverse curvature.

[0151] Table 23

[0152] Table 24

[0153] Example 13

[0154] like Fig.13 As shown, the optical lens includes, from the first side to the second side along the optical axis: a first lens L1 with negative focal power, a second lens L2 with positive focal power, a third lens L3 with positive focal power, a fourth lens L4 with positive focal power, a fifth lens L5 with negative focal power, a sixth lens L6 with positive focal power, a seventh lens L7 with positive focal power, and an eighth lens L8 with positive focal power. The aperture STO can be arranged between the second lens L2 and the third lens L3. The surface shape of each lens can be known according to the data in Table 25, and will not be repeated here. Table 25 shows the parameters of each lens of the optical lens of Example 13. Table 26 shows the parameters of each aspherical mirror surface that can be used in Example 13, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The first side surface S3 and the second side surface S4 of the second lens L2, and the first side surface S14 and the second side surface S15 of the eighth lens L8 have reverse curvature.

[0155] Table 25

[0156] Table 26

[0157] Embodiment 14

[0158] like Fig.14 As shown, the optical lens includes, from the first side to the second side along the optical axis: a first lens L1 with negative focal power, a second lens L2 with positive focal power, a third lens L3 with positive focal power, a fourth lens L4 with positive focal power, a fifth lens L5 with negative focal power, a sixth lens L6 with positive focal power, a seventh lens L7 with positive focal power, and an eighth lens L8 with positive focal power. The aperture STO can be arranged between the second lens L2 and the third lens L3. The surface shape of each lens can be obtained according to the data in Table 27, which will not be repeated. Table 27 shows the parameters of each lens of the optical lens of Example 14. Table 28 shows the parameters of each aspherical mirror surface that can be used in Example 14, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The first side surface S3 and the second side surface S4 of the second lens L2 and the first side surface S14 of the eighth lens L8 have reverse curvature.

[0159] Table 27

[0160] Table 28

[0161] Embodiment 15

[0162] like Fig.15 As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1 with negative focal power, a second lens L2 with positive focal power, a third lens L3 with positive focal power, a fourth lens L4 with positive focal power, a fifth lens L5 with negative focal power, a sixth lens L6 with positive focal power, a seventh lens L7 with positive focal power, and an eighth lens L8 with negative focal power. The aperture STO can be arranged between the second lens L2 and the third lens L3. The surface shape of each lens can be known according to the data in Table 29, which will not be repeated. Table 29 shows the parameters of each lens of the optical lens of Example 15. Table 30 shows the parameters of each aspherical mirror surface that can be used in Example 15, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The first side surface S3 and the second side surface S4 of the second lens L2, and the first side surface S14 and the second side surface S15 of the eighth lens L8 have reverse curvature.

[0163] Table 29

[0164] Table 30

[0165] Example 16

[0166] like Fig.16 As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1 with negative focal power, a second lens L2 with positive focal power, a third lens L3 with positive focal power, a fourth lens L4 with positive focal power, a fifth lens L5 with negative focal power, a sixth lens L6 with positive focal power, a seventh lens L7 with positive focal power, and an eighth lens L8 with negative focal power. The aperture STO can be arranged between the second lens L2 and the third lens L3. The surface shape of each lens can be known according to the data in Table 31, and will not be repeated here. Table 31 shows the parameters of each lens of the optical lens of Example 16. Table 32 shows the parameters of each aspherical mirror surface that can be used in Example 16, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The first side surface S3 and the second side surface S4 of the second lens L2, and the first side surface S14 and the second side surface S15 of the eighth lens L8 have reverse curvature.

[0167] Table 31

[0168] Table 32

[0169] Embodiment 17

[0170] like Fig.17 As shown, the optical lens includes, from the first side to the second side along the optical axis: the optical lens includes, from the first side to the second side along the optical axis, a first lens L1 with negative optical power, a second lens L2 with positive optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with negative optical power, a seventh lens L7 with positive optical power, and an eighth lens L8 with negative optical power. The surface shape of each lens can be obtained according to the data in Table 33, and will not be repeated here. Table 33 shows the parameters of each lens of the optical lens of Example 17. Table 34 shows the parameters of each aspherical mirror surface that can be used in Example 17, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The first side surface S14 and the second side surface S15 of the eighth lens L8 have a reverse curve.

[0171] Table 33

[0172] Table 34

[0173] Embodiment 18

[0174] like Fig.18 As shown, the optical lens includes, from the first side to the second side along the optical axis: the optical lens includes, from the first side to the second side along the optical axis, a first lens L1 with negative optical power, a second lens L2 with positive optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with negative optical power, a seventh lens L7 with positive optical power, and an eighth lens L8 with negative optical power. The surface shape of each lens can be obtained according to the data in Table 35, and will not be repeated. Table 35 shows the parameters of each lens of the optical lens of Example 18. Table 36 shows the parameters of each aspherical mirror surface that can be used in Example 18, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The second side surface S4 of the second lens L2, the first side surface S14 and the second side surface S15 of the eighth lens L8 have reverse curvature.

[0175] Table 35

[0176] Table 36

[0177] Embodiment 19

[0178] like Fig.19As shown, the optical lens includes, from the first side to the second side along the optical axis: the optical lens includes, from the first side to the second side along the optical axis, a first lens L1 with negative optical power, a second lens L2 with positive optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with negative optical power, a seventh lens L7 with positive optical power, and an eighth lens L8 with negative optical power. The surface shape of each lens can be obtained according to the data in Table 37, and will not be repeated here. Table 37 shows the parameters of each lens of the optical lens of Example 19. Table 38 shows the parameters of each aspherical mirror surface that can be used in Example 19, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The first side surface S14 and the second side surface S15 of the eighth lens L8 have a reverse curve.

[0179] Table 37

[0180] Table 38

[0181] Embodiment 20

[0182] like Fig. 20 As shown, the optical lens includes, from the first side to the second side along the optical axis: the optical lens includes, from the first side to the second side along the optical axis, a first lens L1 with negative optical power, a second lens L2 with positive optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with negative optical power, a seventh lens L7 with positive optical power, and an eighth lens L8 with negative optical power. The surface shape of each lens can be obtained according to the data in Table 39, which will not be repeated. Table 39 shows the parameters of each lens of the optical lens of Example 20. Table 40 shows the parameters of each aspherical mirror surface that can be used in Example 20, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1. The first side surface S14 and the second side surface S15 of the eighth lens L8 have a reverse curve.

[0183] Table 39

[0184] Table 40

[0185] In summary, Examples 1 to 20 respectively satisfy the relationships shown in Table 41 and Table 42. In Table 41 and Table 42, the units of F, ENPD, TTL, H, D, TL, BFL, F1-F8, D82, SAG81, SAG82, and F56 are millimeters (mm), the unit of FOV is degrees (°), and FNO has no unit.

[0186] Table 41

[0187] Table 42

[0188] The optical lenses provided in Examples 1 to 20 of the present application can be used as, for example, vehicle-mounted lenses. In this case, Figures 1 to 20 IMA represents an imaging surface, and light from an object passes through each surface S1 to S17 in sequence and is finally imaged on the imaging surface arranged on the second side, wherein an image sensor chip is arranged on the imaging surface. It should be understood that the optical lens provided in Embodiments 1 to 20 of the present application can also be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, Figures 1 to 20 IMA may represent a light source surface, for example. Light from the light source surface sequentially passes through the surfaces S17 to S1 and is finally projected to the first side, for example, to form an image or illuminate an area on the first side.

[0189] The present application also provides an electronic device, which may include an optical lens according to the above-mentioned embodiment of the present application, and also includes at least one of an imaging element and a light source, wherein the imaging element is used to convert the optical image formed by the optical lens into an imaging element of an electrical signal, and the light emitted by the light source is projected to the target area after passing through the optical lens to form an image or illuminate the area. When the electronic device includes an optical lens and an imaging element, the electronic device can be an independent electronic device such as a detection distance camera, an imaging module integrated on a device such as a detection distance, an independent imaging device such as a vehicle-mounted camera, an infrared camera, a drone camera, a night vision camera, a security monitoring camera, etc., an imaging module integrated on an auxiliary driving system, or a laser radar with at least a receiving end. When the electronic device includes an optical lens and a light source, the electronic device can be a projection module integrated on a mobile electronic device, an independent projection device such as a projector, or a laser radar with at least a transmitting end. When the electronic device includes an optical lens, an imaging element and a light source, the electronic device can be, for example, a laser radar with a transmitting end and a receiving end.

[0190] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An optical lens, characterized in that: The optical lens includes, in sequence from the first side to the second side along the optical axis: A first lens having negative optical power, wherein the second side surface of the first lens is concave; a second lens having positive optical power, wherein at least one of the first side surface and the second side surface is convex; a third lens having optical power, wherein the first side surface is concave and the second side surface is convex; a fourth lens having positive power, wherein the first side surface is convex and the second side surface is convex; a fifth lens having optical power; a sixth lens having optical power; a seventh lens element having positive optical power, wherein the first side surface is convex and the second side surface is concave; and an eighth lens having optical power; The number of lenses having optical power in the optical lens is eight; The fifth lens and the sixth lens form a cemented lens group, and the positive and negative properties of the optical power of the fifth lens and the sixth lens are opposite; The combined focal length F56 of the fifth lens and the sixth lens and the effective focal length F of the optical lens satisfy the following conditions: 1≤|F56 / F|≤15; An air interval d78 between the seventh lens and the eighth lens on the optical axis and a total optical length TTL of the optical lens satisfy the following: 0.02≤d78 / TTL≤0.2; and The effective focal length F8 of the eighth lens and the effective focal length F of the optical lens satisfy: |F8 / F|≥9.

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

3. The optical lens according to claim 1, characterized in that: The first side surface of the second lens is a concave surface, and the second side surface is a convex surface; or The first side surface of the second lens is a convex surface, and the second side surface is a concave surface; or The first side surface of the second lens is a convex surface, and the second side surface is a convex surface.

4. The optical lens according to claim 1, characterized in that: The third lens has positive or negative power.

5. The optical lens according to claim 1, characterized in that: The fifth lens has positive power, a first side surface is convex, and a second side surface is convex; The sixth lens has negative optical power, a first side surface of which is concave, and a second side surface of which is convex or concave; or The fifth lens has negative optical power, a first side surface of the fifth lens is a concave surface, and a second side surface of the fifth lens is a convex surface or a concave surface; The sixth lens has positive optical power, and its first side surface is convex, and its second side surface is convex.

6. The optical lens according to claim 1, characterized in that: The eighth lens has positive power, a first side surface is convex, and a second side surface is convex or concave; or The eighth lens has negative optical power, and its first side surface is convex and its second side surface is concave, or the first side surface is concave and the second side surface is convex or concave.

7. The optical lens according to any one of claims 1 to 6, characterized in that: The center thickness d2 of the second lens on the optical axis, the center thickness d3 of the third lens on the optical axis, and the total optical length TTL of the optical lens satisfy the following: 0.05≤(d2+d3) / TTL≤0.

25.

8. The optical lens according to any one of claims 1 to 6, characterized in that: A curvature radius R71 of the first side surface of the seventh lens and a curvature radius R72 of the second side surface of the seventh lens satisfy: 0<R71 / R72≤1.

5.

9. The optical lens according to any one of claims 1 to 6, characterized in that: An effective focal length F5 of the fifth lens and an effective focal length F6 of the sixth lens satisfy: 0.4≤|F5 / F6|≤3.

10. The optical lens according to any one of claims 1 to 6, characterized in that: An air interval d23 between the second lens and the third lens on the optical axis and a total optical length TTL of the optical lens satisfy the following: 0.015≤d23 / TTL≤0.

17.

11. The optical lens according to any one of claims 1 to 6, characterized in that: The effective focal length F2 of the second lens and the effective focal length F of the optical lens satisfy: F2 / F≥2.

5.

12. The optical lens according to any one of claims 1 to 6, characterized in that: The center thickness d8 of the eighth lens on the optical axis, the distance SAG82 from the intersection of the second side surface of the eighth lens and the optical axis to the effective radius vertex of the second side surface of the eighth lens on the optical axis, and the distance SAG81 from the intersection of the first side surface of the eighth lens and the optical axis to the effective radius vertex of the first side surface of the eighth lens on the optical axis satisfy: 0.6≤d8 / (d8+SAG82-SAG81)≤1.

5.

13. The optical lens according to any one of claims 1 to 6, characterized in that: The maximum light clearance diameter D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens and the total optical length TTL of the optical lens satisfy the following: 0.25≤D / TTL≤0.

37.

14. The optical lens according to any one of claims 1 to 6, characterized in that: A curvature radius R72 of the second side surface of the seventh lens and an air distance d78 between the seventh lens and the eighth lens on the optical axis satisfy: R72 / d78≥1.

5.

15. The optical lens according to any one of claims 1 to 6, characterized in that: The effective focal length F1 of the first lens and the effective focal length F of the optical lens satisfy: -2≤F1 / F≤-0.

5.

16. The optical lens according to any one of claims 1 to 6, characterized in that: The effective focal length F4 of the fourth lens and the effective focal length F of the optical lens satisfy: 0.8≤F4 / F≤2.

5.

17. The optical lens according to any one of claims 1 to 6, characterized in that: The maximum light clearance aperture D of the first side surface of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: D / H / FOV×1°≤0.

015.

18. The optical lens according to any one of claims 1 to 6, characterized in that: The curvature radius R11 of the first side surface of the first lens and the effective focal length F of the optical lens satisfy: |R11 / F|≥20.

19. The optical lens according to any one of claims 1 to 6, characterized in that: The effective focal length F4 of the fourth lens, the combined focal length F56 of the fifth lens and the sixth lens, the effective focal length F7 of the seventh lens and the effective focal length F of the optical lens satisfy: 0.05≤(1 / F4+1 / F56+1 / F7) / (1 / F)≤2.

20. The optical lens according to any one of claims 1 to 6, characterized in that: The total optical length TTL of the optical lens and the effective focal length F of the optical lens satisfy: 3.5≤TTL / F≤6.

5.

21. The optical lens according to any one of claims 1 to 6, characterized in that: An air interval d34 between the third lens and the fourth lens on the optical axis and a total optical length TTL of the optical lens satisfy the following: d34 / TTL≤0.

01.

22. The optical lens according to claim 1, characterized in that: The optical lens satisfies at least one of the following conditions: 0.29≤D82 / TTL≤0.4, 1≤|F3 / F|≤40, 1≤F7 / F≤25, 55°≤(FOV×F) / H≤70°, 2.5≤TTL / H≤3.5, 0.06≤BFL / TL≤0.16, -17≤R32 / F≤-0.5, 0.45≤F / H≤0.7, 1.4≤F / ENPD≤2, 0.8≤D82 / H≤1.2, Among them, D82 is the maximum clear aperture of the second side surface of the eighth lens corresponding to the maximum field of view angle of the optical lens, F3 is the effective focal length of the third lens, F7 is the effective focal length of the seventh lens, FOV is the maximum field of view angle of the optical lens, H is the image height corresponding to the maximum field of view angle of the optical lens, BFL is the optical back focus of the optical lens, TL is the distance from the center of the first side surface of the first lens to the center of the second side surface of the eighth lens on the optical axis, R32 is the curvature radius of the second side surface of the third lens, and ENPD is the entrance pupil diameter of the optical lens.

23. The optical lens according to claim 1, characterized in that: The optical lens satisfies at least one of the following conditions: 10≤|F8 / F|≤2000, 0.7≤d8 / (d8+SAG82-SAG81)≤1.3, 0.30≤D / TTL≤0.33, 0.07≤(d2+d3) / TTL≤0.2, 0.3≤D82 / TTL≤0.39, 0.03≤d78 / TTL≤0.19, 0.01≤R71 / R72≤1, 2≤R72 / d78≤600, 0.5≤|F5 / F6|≤2.8, 0.02≤d23 / TTL≤0.16, -1.5≤F1 / F≤-1.1, 3≤F2 / F≤260, 1.3≤|F3 / F|≤35, 1≤F4 / F≤2.2, 1.5≤F7 / F≤20, 1.2≤|F56 / F|≤12, 58°≤(FOV×F) / H≤65°, 0.008≤D / H / FOV×1°≤0.01, 2.8≤TTL / H≤3, 0.065≤BFL / TL≤0.15, |R11 / F|≥25, 0.07≤(1 / F4+1 / F56+1 / F7) / (1 / F)≤1.8, -14≤R32 / F≤-0.8, 0.5≤F / H≤0.65, 0.002≤d34 / TTL≤0.006, 4.5≤TTL / F≤5, 1.6≤F / ENPD≤1.9, 0.85≤D82 / H≤1.1, Wherein, d8 is the center thickness of the eighth lens on the optical axis, SAG82 is the distance from the intersection of the second side surface of the eighth lens and the optical axis to the vertex of the effective radius of the second side surface of the eighth lens on the optical axis, SAG81 is the distance from the intersection of the first side surface of the eighth lens and the optical axis to the vertex of the effective radius of the first side surface of the eighth lens on the optical axis, D is the maximum clear aperture of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, d2 is the center thickness of the second lens on the optical axis, d3 is the center thickness of the third lens on the optical axis, D82 is the maximum clear aperture of the second side surface of the eighth lens corresponding to the maximum field angle of the optical lens, d78 is the air gap between the seventh lens and the eighth lens on the optical axis, R71 is the radius of curvature of the first side surface of the seventh lens, and R72 is the curvature of the second side surface of the seventh lens. radius, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, d23 is the air spacing between the second lens and the third lens on the optical axis, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F7 is the effective focal length of the seventh lens, FOV is the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, BFL is the optical back focus of the optical lens, TL is the distance from the center of the first side surface of the first lens to the center of the second side surface of the eighth lens on the optical axis, R11 is the curvature radius of the first side surface of the first lens, d34 is the air spacing between the third lens and the fourth lens on the optical axis, R32 is the curvature radius of the second side surface of the third lens, and ENPD is the entrance pupil diameter of the optical lens.

24. The optical lens according to claim 1, characterized in that: The optical lens satisfies at least one of the following conditions: 12.9677≤|F8 / F|≤1397.2671, 0.7891≤d8 / (d8+SAG82-SAG81)≤1.1869, 0.3074≤D / TTL≤0.3243, 0.1060≤(d2+d3) / TTL≤0.1835, 0.3202≤D82 / TTL≤0.3734, 0.0433≤d78 / TTL≤0.1449, 0.0202≤R71 / R72≤0.9447, 2.4606≤R72 / d78≤384.4675, 0.5773≤|F5 / F6|≤2.6631, 0.0348≤d23 / TTL≤0.1219, -1.3782≤F1 / F≤-1.1319, 4.0869≤F2 / F≤160.4574, 1.6770≤|F3 / F|≤23.1406, 1.2236≤F4 / F≤1.9881, 2.2311≤F7 / F≤15.3532, 1.4339≤|F56 / F|≤8.6395, 60.6630°≤(FOV×F) / H≤61.5807°, 0.0088≤D / H / FOV×1°≤0.0093, 2.8638≤TTL / H≤2.9258, 0.0791≤BFL / TL≤0.1296, 16.2696≤|R11 / F|≤1.2316E+17, 0.1333≤(1 / F4+1 / F56+1 / F7) / (1 / F)≤1.2734, -9.3384≤R32 / F≤-1.1958, 0.5965≤F / H≤0.6055, 0.0033≤d34 / TTL≤0.0057, 4.8010≤TTL / F≤4.8396, 1.6400≤F / ENPD≤1.8501, 0.9334≤D82 / H≤1.0884, Wherein, d8 is the center thickness of the eighth lens on the optical axis, SAG82 is the distance from the intersection of the second side surface of the eighth lens and the optical axis to the vertex of the effective radius of the second side surface of the eighth lens on the optical axis, SAG81 is the distance from the intersection of the first side surface of the eighth lens and the optical axis to the vertex of the effective radius of the first side surface of the eighth lens on the optical axis, D is the maximum clear aperture of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, d2 is the center thickness of the second lens on the optical axis, d3 is the center thickness of the third lens on the optical axis, D82 is the maximum clear aperture of the second side surface of the eighth lens corresponding to the maximum field angle of the optical lens, d78 is the air gap between the seventh lens and the eighth lens on the optical axis, R71 is the radius of curvature of the first side surface of the seventh lens, and R72 is the curvature of the second side surface of the seventh lens. radius, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, d23 is the air spacing between the second lens and the third lens on the optical axis, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F7 is the effective focal length of the seventh lens, FOV is the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, BFL is the optical back focus of the optical lens, TL is the distance from the center of the first side surface of the first lens to the center of the second side surface of the eighth lens on the optical axis, R11 is the curvature radius of the first side surface of the first lens, d34 is the air spacing between the third lens and the fourth lens on the optical axis, R32 is the curvature radius of the second side surface of the third lens, and ENPD is the entrance pupil diameter of the optical lens.

25. An electronic device, characterized in that: comprising an optical lens according to any one of claims 1-24; as well as The electronic device further comprises: at least one of an imaging element and a light source, wherein: The imaging element is used to convert the optical image formed by the optical lens into an electrical signal. The light emitted by the light source is projected onto the target area after passing through the optical lens to form an image or illuminate the area.

Images