Optical lens

Abstract

The application provides an optical lens, which comprises eight lenses in sequence along an optical axis from an object side to an imaging surface, and the eight lenses comprise: a first lens with negative optical power, wherein an object side surface of the first lens is a convex surface, and an image side surface of the first lens is a concave surface; a second lens with negative optical power, wherein an object side surface of the second lens is a concave surface, and an image side surface of the second lens is a convex surface; a third lens with positive optical power; a fourth lens with positive optical power, wherein an image side surface of the fourth lens is a convex surface; a fifth lens with positive optical power; a sixth lens with negative optical power; a seventh lens with positive optical power; and an eighth lens with negative optical power. The optical lens provided by the application improves the imaging quality of the optical lens, reduces aberration, improves the imaging quality of the optical lens, and makes the lens have one or more advantages of super wide angle, high pixel, high imaging quality and the like.

Description

TECHNICAL FIELD

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

[0002] With the continuous progress of existing image processing algorithms and AI technology, high-definition wide-angle lenses, as a special type of optical lens, are widely used in action cameras, vehicle-mounted lenses, smart homes and other fields. Therefore, the requirements for high-definition wide-angle lenses are becoming higher and higher.

[0003] However, the existing high-definition wide-angle lens devices still have many shortcomings, for example, the size of the lens is too long, the volume is large, the weight is heavy, which is not convenient for carrying; the field of view of the lens is increased, which leads to difficulty in system aberration correction and decline in imaging quality; the relative aperture of the lens is small, the light transmission performance is poor, and it cannot adapt to dark environments; and the existing lens imaging target surface is small, which is difficult to meet market demand.

[0004] Therefore, it is necessary to develop an optical lens with one or more advantages of ultra-wide angle, high imaging quality, high pixels, etc., so as to better meet the high demand of the market for high-definition wide-angle lenses. SUMMARY

[0005] In view of the above problems, the purpose of the present application is to provide an optical lens with one or more advantages of ultra-wide angle, high pixels, high imaging quality, etc.

[0006] The present application provides an optical lens, which comprises eight lenses arranged along the optical axis from the object side to the imaging surface, including: a first lens with negative focal power, the object side surface of which is convex, and the image side surface of which is concave; a second lens with negative focal power, the object side surface of which is concave, and the image side surface of which is convex; a third lens with positive focal power; a fourth lens with positive focal power, the image side surface of which is convex; a fifth lens with positive focal power; a sixth lens with negative focal power; a seventh lens with positive focal power; and an eighth lens with negative focal power.

[0007] Further preferably, at least one of the fifth lens, the sixth lens and the seventh lens is a meniscus lens, the object side surface of which is convex, and the image side surface of which is concave, or the object side surface of which is concave, and the image side surface of which is convex.

[0008] Further preferably, a reflective element is arranged between the third lens and the fourth lens, the surface of the reflective element facing the object side is an incident surface, and the surface of the reflective element facing the imaging surface is an exit surface.

[0009] Further preferably, the effective focal length f of the optical lens and the total track length TTL satisfy: TTL / f < 25.0.

[0010] It is further preferred that the total track length TTL of the optical lens and the real image height IH corresponding to the maximum field of view angle satisfy: TTL / IH<9.0.

[0011] It is further preferred that the effective focal length f of the optical lens, the radian θ of the maximum half field of view angle, and the real image height IH corresponding to the maximum field of view angle satisfy: 0.55<(IH / 2) / (f×θ)<1.0.

[0012] It is further preferred that the effective focal length f of the optical lens and the back focal length BFL satisfy: BFL / f>0.8.

[0013] It is further preferred that the effective focal length f of the optical lens, the maximum field of view angle FOV, and the real image height IH corresponding to the maximum field of view angle satisfy: 58.0<(f×FOV) / IH.

[0014] It is further preferred that the real image height IHm corresponding to the central field of view angle of the optical lens and the real image height IH corresponding to the maximum field of view angle satisfy: 0.51≤IHm / IH.

[0015] It is further preferred that the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: f1 / f<-4.5.

[0016] It is further preferred that the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: f2 / f<-3.5.

[0017] It is further preferred that the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 5.8<f3 / f.

[0018] It is further preferred that the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 4.5<f4 / f.

[0019] It is further preferred that the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 2.8<f5 / f.

[0020] It is further preferred that the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -6.5<f6 / f<-1.2.

[0021] It is further preferred that the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.2<f7 / f<5.5.

[0022] It is further preferred that the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: f8 / f<-2.5.

[0023] It is further preferred that the effective focal length f of the optical lens and the image-side radius of curvature R8 of the fourth lens satisfy: R8 / f<-4.0.

[0024] It is further preferred that the object-side radius of curvature R3 and the image-side radius of curvature R4 of the second lens satisfy: -0.95<(R3-R4) / (R3+R4)<-0.15.

[0025] It is further preferred that the interval distance CT34 on the optical axis between the third lens and the fourth lens and the effective focal length f of the optical lens satisfy: 1.0<CT34 / f<6.5.

[0026] It is further preferred that the sum ∑CT of the central thicknesses of the first lens to the eighth lens and the total optical length TTL of the optical lens satisfy: 0.35<∑CT / TTL<0.55.

[0027] The optical lens provided by the present application improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens by reasonable configuration of each lens surface and reasonable matching of optical power, so that the optical lens has one or more advantages such as super wide angle, high pixel, and high imaging quality. BRIEF DESCRIPTION OF DRAWINGS

[0028] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the following drawings, in which:

[0029] Figure 1 The figure is a structural schematic diagram of the optical lens in the example of the present application.

[0030] Figure 2 The figure is a structural schematic diagram of the optical lens in the example 1 of the present application.

[0031] Figure 3 The figure is an MTF curve diagram of the optical lens in the example 1 of the present application.

[0032] Figure 4 The figure is a structural schematic diagram of the optical lens in the example 2 of the present application.

[0033] Figure 5 The figure is an MTF curve diagram of the optical lens in the example 2 of the present application.

[0034] Figure 6 The figure is a structural schematic diagram of the optical lens in the example 3 of the present application.

[0035] Figure 7 The figure is an MTF curve diagram of the optical lens in the example 3 of the present application.

[0036] Figure 8 The figure is a structural schematic diagram of the optical lens in the example 4 of the present application.

[0037] Figure 9 MTF curve diagram of the optical lens in embodiment 4 of the present application.

[0038] Figure 10 Structural schematic diagram of the optical lens in embodiment 5 of the present application.

[0039] Figure 11 MTF curve diagram of the optical lens in embodiment 5 of the present application.

[0040] Figure 12 Structural schematic diagram of the optical lens in embodiment 6 of the present application.

[0041] Figure 13 MTF curve diagram of the optical lens in embodiment 6 of the present application.

[0042] Figure 14 Structural schematic diagram of the optical lens in embodiment 7 of the present application.

[0043] Figure 15 MTF curve diagram of the optical lens in embodiment 7 of the present application.

[0044] Figure 16 Structural schematic diagram of the optical lens in embodiment 8 of the present application.

[0045] Figure 17 MTF curve diagram of the optical lens in embodiment 8 of the present application.

[0046] Figure 18 Structural schematic diagram of the optical lens in embodiment 9 of the present application.

[0047] Figure 19 MTF curve diagram of the optical lens in embodiment 9 of the present application.

[0048] Figure 20 Structural schematic diagram of the optical lens in embodiment 10 of the present application.

[0049] Figure 21 MTF curve diagram of the optical lens in embodiment 10 of the present application.

[0050] Figure 22 Structural schematic diagram of the optical lens in embodiment 11 of the present application.

[0051] Figure 23 MTF curve diagram of the optical lens in embodiment 11 of the present application.

[0052] Figure 24 Structural schematic diagram of the optical lens in embodiment 12 of the present application.

[0053] Figure 25A MTF curve diagram of the optical lens in Embodiment 12 of the present application.

[0054] Figure 26 A structure diagram of the optical lens in Embodiment 13 of the present application.

[0055] Figure 27 A MTF curve diagram of the optical lens in Embodiment 13 of the present application.

[0056] Figure 28 A structure diagram of the optical lens in Embodiment 14 of the present application.

[0057] Figure 29 A MTF curve diagram of the optical lens in Embodiment 14 of the present application.

[0058] Figure 30 A structure diagram of the optical lens in Embodiment 15 of the present application.

[0059] Figure 31 A MTF curve diagram of the optical lens in Embodiment 15 of the present application.

[0060] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0061] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0062] It is noted that, in this specification, the expressions first, second, third, etc. are merely used to distinguish one feature from another feature, and do not indicate any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0063] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical surface or the aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0064] In the present disclosure, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side surface of the lens.

[0065] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when expressions such as "at least one of" appear after a list of items, it modifies the entire list of items and not the individual items themselves. Furthermore, when describing embodiments of the present application, the word "may" means "one or more embodiments of the present application". Also, the word "exemplary" is intended to mean an example or an illustration.

[0066] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that the terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0067] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0068] Examples

[0069] Please refer to Figure 1 The structure of the optical lens in the present application is shown in the following figure. Figure 1 The difference between (A) and (B) is that the prism structure in (B) is a fold-back structure. The reason for this phenomenon is that a fold-back coordinate breakpoint is added to the prism during the design process, the target surface is changed to a mirror of folded light path, the coordinate system of the optical lens after the prism is changed, and the curvature radius R and the thickness D of the lens after the prism are opposite to the distance L. It should be noted that the optical lens data of the fold-back structure is transformed into the optical lens of the straight line structure in order to unify the coordinate system for the description and calculation of the optical lens, and it cannot be understood as a limitation of the scope of the present application. Figure 1The difference between the middle (A) and (C) is that the prism structure is cancelled in (C), and the reason for this phenomenon is that the optical path of the optical lens is designed as a return structure in the design process, which is beneficial to the assembly in a small space. It should be noted that the purpose of adding the return structure is to improve the compactness of the optical lens, so as to avoid the optical lens being too large to be assembled, and it cannot be understood as a limitation of the scope of the present application.

[0070] The optical lens provided by the embodiment of the present application comprises eight lenses, which are sequentially arranged along the optical axis from the object side to the imaging surface as the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens.

[0071] In some embodiments, the first lens can have a negative focal power, which is beneficial to reduce the inclination angle of the incident light, thereby effectively sharing the large field of view on the object side. The object side of the first lens is convex, and the image side is concave, which is beneficial to collect as much edge field of view light as possible into the rear optical lens, thereby realizing large-angle light collection.

[0072] In some embodiments, the second lens can have a negative focal power, which is helpful for smooth transition of light, expands the field of view angle of the optical imaging lens, reduces the difficulty of correcting distortion and chromatic aberration of the rear end lens, and improves the image quality of the optical imaging lens. The object side of the second lens is concave, and the image side is convex, which is beneficial to receive the light emitted by the first lens and further disperse the light, so that the trend of the light is as smooth as possible, while reducing the field curvature and improving the imaging quality of the optical lens.

[0073] In some embodiments, the third lens can have a positive focal power, which is beneficial to improve the light converging ability of the optical lens, balance various aberrations of the optical lens, and improve the imaging quality of the optical lens. The third lens can have a convex object side and a concave image side, or both the object side and the image side are convex, or the object side is concave and the image side is convex.

[0074] In some embodiments, the fourth lens can have a positive focal power, which is beneficial to improve the light converging ability of the optical lens, balance various aberrations of the optical lens, and improve the imaging quality of the optical lens. The image side of the fourth lens is convex, which can fold and converge the light, share the converging effect of the third lens on the light, and is beneficial to the light entering the fifth lens more smoothly, reduce the aperture of the rear lens group, and reduce the sensitivity of the optical lens.

[0075] In some embodiments, the fifth lens can have a positive focal power, which is beneficial to improve the light converging ability of the optical lens, balance various aberrations of the optical lens, and improve the imaging quality of the optical lens. The fifth lens can have a convex object side and a concave image side, or both the object side and the image side are convex, or the object side is concave and the image side is convex.

[0076] In some embodiments, the sixth lens can have negative focal power, which is beneficial for diverging the light rays converged by the fourth lens and the fifth lens, so that the light rays can reach a higher imaging position. The sixth lens can have a convex object side surface and a concave image side surface, or both the object side surface and the image side surface are concave, or the object side surface is concave and the image side surface is convex.

[0077] In some embodiments, the seventh lens can have positive focal power, which is beneficial for further converging the light rays, and in combination with the sixth lens having negative focal power, can correct chromatic aberration. The seventh lens can have a convex object side surface and a concave image side surface, or both the object side surface and the image side surface are convex, or the object side surface is concave and the image side surface is convex.

[0078] In some embodiments, the eighth lens can have negative focal power, which is beneficial for diverging the incident light rays, so that the peripheral light rays and the central light rays are turned upward to reach a higher imaging position. The eighth lens can have a convex object side surface and a concave image side surface, or both the object side surface and the image side surface are concave, or the object side surface is concave and the image side surface is convex.

[0079] In some embodiments, at least one of the fifth lens, the sixth lens and the seventh lens is a meniscus lens, which has a convex object side surface and a concave image side surface, or a concave object side surface and a convex image side surface. If the fifth lens is a meniscus lens, the distance between the incident light rays and the optical axis can be reduced, which is beneficial for reducing the front end aperture of the optical lens and smoothly transitioning the light rays in the fifth lens. Meanwhile, the deflection angle of the light rays can be reduced, the generation of aberration can be reduced, and the imaging quality of the optical lens can be improved. If the sixth lens is a meniscus lens, the height of the light rays in the lens can be reduced, which is beneficial for reducing the rear end aperture of the optical lens. Meanwhile, the light rays can smoothly transition, the light rays are not deflected greatly, the ghost energy of the light rays reflected by the object side surface of the sixth lens can be reduced, and thus the ghost energy on the imaging screen can be reduced. If the seventh lens is a meniscus lens, the diverging light rays from the sixth lens can be quickly converged, the energy loss of the light rays can be reduced, and meanwhile the converged diverging light rays can smoothly enter the rear, which further makes the light rays smoothly transition and improves the relative luminance of the edge field of view.

[0080] In some embodiments, the optical lens can further include a diaphragm, which can be located between the fifth lens and the sixth lens. It can be understood that the diaphragm is used to limit the amount of light, so as to change the brightness of the imaging. In addition, when the diaphragm is located between the fifth lens and the sixth lens, the diaphragm can reasonably distribute the functions of the first lens to the eighth lens, for example, the first lens, the second lens and the fifth lens can be used to receive light rays to a greater extent and reduce the generation of various types of aberration, and the sixth lens to the eighth lens can be used for the function of correcting aberration, which is beneficial for balancing the structure of the entire optical system. Furthermore, when the diaphragm is located between the fifth lens and the sixth lens, the diaphragm aberration can be corrected.

[0081] In some embodiments, the optical lens can further comprise a filter disposed between the eighth lens and the imaging surface. The filter is used to filter out interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0082] In some embodiments, in order to reduce the size of the optical lens, a reflection element with no optical power for light path folding can be disposed between the third lens and the fourth lens, and the reflection element is a prism. The surface of the prism towards the object side is an incident surface, and the surface towards the imaging surface is an exit surface, both of which are planar. The prism can be a right-angle prism, and the light from the object side direction enters the prism from the incident surface, is reflected by the reflection surface, and then exits from the exit surface. By bending the light path through the prism, the thickness of the lens can be effectively shortened.

[0083] In some embodiments, the effective focal length f of the optical lens and the total optical length TTL satisfy: TTL / f < 25.0. Satisfying the above range means that the optical length of the optical lens can be effectively limited, which is beneficial to realize the miniaturization of the optical lens.

[0084] In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field of view angle satisfy: TTL / IH < 9.0. Satisfying the above range means that the total optical length and the image height of the optical lens can be effectively limited, which is beneficial to realize short total optical length and large image height.

[0085] In some embodiments, the effective focal length f of the optical lens, the radian θ of the maximum half field of view angle, and the real image height IH corresponding to the maximum field of view angle satisfy: 0.55 < (IH / 2) / (f x θ) < 1.0. Satisfying the above range means that the structure has higher design flexibility, which can effectively control the distortion range and meet the requirements of different distortion algorithms.

[0086] In some embodiments, the effective focal length f of the optical lens and the optical back focal length BFL satisfy: BFL / f > 0.8. Satisfying the above range can make the lens have a larger back focus, which is beneficial to the assembly of the module, reduces interference, and improves production yield.

[0087] In some embodiments, the effective focal length f of the optical lens, the maximum field of view angle FOV, and the real image height IH corresponding to the maximum field of view angle satisfy: 58.0 < (f x FOV) / IH. Satisfying the above range is beneficial to meet the requirements of large field of view of the optical lens, while realizing large image height and long focal length, and is more beneficial to realize small distortion and improve the imaging quality of the optical lens.

[0088] In some embodiments, a real image height IHm corresponding to a central field of view angle of the optical lens satisfies: 0.51≤IHm / IH. Satisfying the above range can effectively increase the proportion of the central field of view imaging range in the entire imaging range, and compared with lenses of the same field of view angle, the proportion of the central field of view imaging range in the entire imaging range is larger, and more detailed information can be obtained.

[0089] In some embodiments, a focal length f1 of the first lens and an effective focal length f of the optical lens satisfy: f1 / f<-4.5. Satisfying the above range can make the first lens have appropriate negative refractive power, avoid excessive concentration of negative refractive power, and at the same time, be beneficial to increasing the field of view angle and collecting as much edge field of view light as possible into the rear optical lens to realize large-angle light collection.

[0090] In some embodiments, a focal length f2 of the second lens and an effective focal length f of the optical lens satisfy: f2 / f<-3.5. Satisfying the above range can make the second lens have appropriate negative refractive power, increase the field of view angle, and improve the imaging quality of the optical lens.

[0091] In some embodiments, a focal length f3 of the third lens and an effective focal length f of the optical lens satisfy: 5.8<f3 / f. Satisfying the above range can make the third lens have appropriate positive refractive power, be beneficial to improving the light converging ability of the optical lens, and at the same time, balance various aberrations generated by the optical lens to improve the imaging quality of the optical lens.

[0092] In some embodiments, a focal length f4 of the fourth lens and an effective focal length f of the optical lens satisfy: 4.5<f4 / f. Satisfying the above range can make the fourth lens have appropriate positive refractive power, be beneficial to improving the light converging ability of the optical lens, and at the same time, balance the aberration of the optical lens to improve the imaging quality of the optical lens.

[0093] In some embodiments, a focal length f5 of the fifth lens and an effective focal length f of the optical lens satisfy: 2.8<f5 / f. Satisfying the above range can make the fifth lens have appropriate positive refractive power, be beneficial to improving the light converging ability of the optical lens, and at the same time, balance the aberration of the optical lens to improve the imaging quality of the optical lens.

[0094] In some embodiments, a focal length f6 of the sixth lens and an effective focal length f of the optical lens satisfy: -6.5<f6 / f<-1.2. Satisfying the above range can make the sixth lens have appropriate negative refractive power, be beneficial to diverging the light converging through the fourth lens and the fifth lens, and increase the image height of the optical lens.

[0095] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.2 < f7 / f < 5.5. Satisfying the above range, the seventh lens can have a proper positive refractive power, which is conducive to suppressing the angle of exiting light rays in the edge field of view.

[0096] In some embodiments, the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: f8 / f < -2.5. Satisfying the above range, the eighth lens can have a proper negative refractive power, which is conducive to diverging light rays and making peripheral light rays and central light rays turn upward to a higher imaging position.

[0097] In some embodiments, the effective focal length f of the optical lens and the image-side curvature radius R8 of the fourth lens satisfy: R8 / f < -4.0. Satisfying the above range, the image-side surface of the fourth lens is relatively flat, and the light rays passing through the image-side surface of the fourth lens have a small influence on the light ray trend, which is conducive to reducing the CRA of the optical lens.

[0098] In some embodiments, the object-side curvature radius R3 and the image-side curvature radius R4 of the second lens satisfy: -0.95 < (R3-R4) / (R3+R4) < -0.15. Satisfying the above range, the light rays exiting the first lens can be received and further diverged, so that the light ray trend is as flat as possible, while the field curvature can be reduced and the imaging quality of the optical lens can be improved.

[0099] In some embodiments, the interval distance CT34 of the third lens and the fourth lens on the optical axis and the effective focal length f of the optical lens satisfy: 1.0 < CT34 / f < 6.5. Satisfying the above range, the folding structure of the optical lens can be realized, and the thickness of the lens can be reduced.

[0100] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the eighth lens and the total optical length TTL of the optical lens satisfy: 0.35 < ∑CT / TTL < 0.55. Satisfying the above range, the total length and volume of the optical lens can be compressed, and the miniaturization of the optical lens can be maintained.

[0101] In some embodiments, the optical lens satisfies the condition: FOV > 190°, 33.0 mm < TTL < 35.5 mm, 1.4 mm < f < 2.4 mm, 4.0 mm < IH < 6.0 mm, where FOV represents the maximum field of view of the optical lens, TTL represents the total optical length of the optical lens, f represents the effective focal length of the optical lens, and IH represents the real image height corresponding to the maximum field of view of the optical lens. Satisfying the above conditions indicates that the optical lens provided in the embodiments has at least one of the characteristics of super wide angle and large image surface.

[0102] In some embodiments, the sixth lens and the seventh lens can be bonded to form a bonded lens, which can effectively correct chromatic aberration of the optical lens, reduce sensitivity of the optical lens to decentration, balance aberration of the optical lens, improve imaging quality of the optical lens, reduce assembly sensitivity of the optical lens, and thus reduce processing difficulty of the optical lens and improve assembly yield of the optical lens.

[0103] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens can be spherical lenses or aspherical lenses. Compared with spherical structures, aspherical structures can effectively reduce aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving miniaturization of the optical lens. More specifically, the second lens, the third lens, and the eighth lens in the optical lens provided by the application can be aspherical lenses, and the first lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can be spherical lenses.

[0104] In various embodiments of the application, when the lenses are aspherical lenses, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0105]

[0106] wherein z is the distance of the curved surface from the vertex of the curved surface in the direction of the optical axis, h is the distance from the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the quadratic surface coefficient, and B, C, D, E, and F are the fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients, respectively.

[0107] The application will be further described in the following embodiments. In various embodiments, the thickness, the radius of curvature, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, and any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the application should be regarded as equivalent replacement modes, and are included in the protection scope of the application.

[0108] Embodiment 1

[0109] Please refer to Figure 2 , which is a structural schematic diagram of the optical lens provided in Embodiment 1 of the application. The optical lens includes, in order from the object side to the imaging surface along the optical axis, a first lens L1, a second lens L2, a third lens L3, a prism, a fourth lens L4, a fifth lens L5, a diaphragm ST, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter G1.

[0110] The first lens L1 has negative focal power, the object side S1 is a convex surface, and the image side S2 is a concave surface; the second lens L2 has negative focal power, the object side S3 is a convex surface, and the image side S4 is a concave surface; the third lens L3 has positive focal power, the object side S5 is a concave surface, and the image side S6 is a convex surface; the prism has a plane as the object side and a plane as the image side; the fourth lens L4 has positive focal power, and the object side S7 and the image side S8 are both convex surfaces; the fifth lens L5 has positive focal power, the object side S9 is a convex surface, and the image side S10 is a concave surface; the sixth lens L6 has negative focal power, the object side S11 is a convex surface, and the image side S12 is a concave surface; the seventh lens L7 has positive focal power, the object side S12 is a convex surface, and the image side S13 is a concave surface; the sixth lens L6 and the seventh lens L7 form a cemented lens, and the cemented surface is S12; the eighth lens L8 has negative focal power, the object side S14 is a convex surface, and the image side S15 is a concave surface; the object side S16 and the image side S17 of the filter G1 are both planes; and the imaging surface S18 is a plane.

[0111] The first lens L1, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are glass spherical lenses; and the second lens L2, the third lens L3, and the eighth lens L8 are glass aspherical lenses.

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

[0113] Table 1-1

[0114]

[0115]

[0116] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 1 are shown in Table 1-2.

[0117] Table 1-2

[0118] Surface number K B C D E F S3 -2.54E+00 0.00E+00 2.27E-03 -3.79E-05 3.14E-07 -1.16E-09 S4 -9.63E+00 0.00E+00 2.12E-03 -2.01E-06 6.04E-07 3.69E-08 S5 -3.00E+02 0.00E+00 -1.96E-03 1.34E-05 -3.73E-07 2.92E-08 S6 -1.50E-01 0.00E+00 -2.18E-04 -2.62E-06 1.06E-07 4.55E-10 S14 -3.37E+00 0.00E+00 -2.86E-03 1.80E-04 -4.75E-04 7.54E-05 S15 -3.74E-01 0.00E+00 -3.08E-03 -1.70E-05 -2.68E-04 3.23E-05

[0119] In this embodiment, Figure 3 The MTF (modulation transfer function) curve of Embodiment 1 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies in each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of this embodiment is above 0.3 in the full field of view, and in the range of 0-230 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0120] Embodiment 2

[0121] Please see Figure 4 The figure shown is a schematic diagram of the optical lens provided in Embodiment 2 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0122] The relevant parameters of each lens in the optical lens of Example 2 are shown in Table 2-1.

[0123] Table 2-1

[0124]

[0125]

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

[0127] Table 2-2

[0128] Surface number K B C D E F S3 -3.31E+00 0.00E+00 1.52E-03 -2.08E-05 1.97E-07 -5.30E-10 S4 -8.20E+00 0.00E+00 6.72E-04 2.99E-05 -3.76E-07 1.23E-08 S5 5.58E+00 0.00E+00 -1.63E-03 3.13E-06 3.20E-06 -5.64E-08 S6 -1.03E+01 0.00E+00 -1.15E-03 5.23E-05 -1.38E-06 3.89E-08 S14 1.28E+02 0.00E+00 -8.08E-03 1.98E-04 -3.17E-04 4.51E-05 S15 4.61E+01 0.00E+00 -3.25E-03 2.51E-05 2.71E-05 -6.80E-06

[0129] from Figure 5 As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. In the range of 0 to 230 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0130] Example 3

[0131] Please see Figure 6 The figure shown is a schematic diagram of the optical lens provided in Embodiment 3 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0132] The relevant parameters of each lens in the optical lens of Example 3 are shown in Table 3-1.

[0133] Table 3-1

[0134]

[0135]

[0136] The surface profile parameters of the aspherical lens in Example 3 are shown in Table 3-2.

[0137] Table 3-2

[0138] Surface number K B C D E F S3 -2.05E+00 0.00E+00 2.51E-03 -4.74E-05 5.38E-07 -2.76E-09 S4 -3.13E+00 0.00E+00 2.57E-03 -2.72E-05 7.70E-07 -7.12E-09 S5 -4.60E+00 0.00E+00 5.97E-04 5.49E-06 5.29E-07 -3.06E-08 S6 1.25E+00 0.00E+00 2.20E-03 2.05E-05 1.09E-05 -6.39E-07 S14 1.25E+01 0.00E+00 -8.53E-03 -3.04E-04 -7.87E-05 3.02E-05 S15 2.86E+00 0.00E+00 -8.79E-03 -1.31E-03 9.68E-05 -6.65E-05

[0139] from Figure 7As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. In the range of 0 to 230 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0140] Example 4

[0141] Please see Figure 8 The figure shown is a schematic diagram of the optical lens provided in Embodiment 4 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0142] The relevant parameters of each lens in the optical lens of Example 4 are shown in Table 4-1.

[0143] Table 4-1

[0144]

[0145]

[0146] The surface profile parameters of the aspherical lens in Example 4 are shown in Table 4-2.

[0147] Table 4-2

[0148] Surface number K B C D E F S3 -2.67E+00 0.00E+00 2.22E-03 -4.08E-05 7.57E-07 -5.42E-09 S4 -3.36E+00 0.00E+00 3.95E-04 9.08E-05 -3.56E-06 8.15E-08 S5 5.73E+00 0.00E+00 -3.07E-03 8.98E-05 1.69E-06 -3.33E-08 S6 -4.75E-01 0.00E+00 -5.17E-04 2.96E-05 -6.24E-07 1.95E-08 S14 -7.39E+01 0.00E+00 -1.57E-02 3.95E-03 -5.68E-04 8.21E-05 S15 1.62E+01 0.00E+00 -5.96E-03 5.83E-04 6.15E-05 -1.67E-05

[0149] from Figure 9 As can be seen, the MTF value of this embodiment is above 0.45 throughout the entire field of view. In the range of 0 to 230 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0150] Example 5

[0151] Please see Figure 10 The figure shown is a schematic diagram of the structure of the optical lens provided in Embodiment 5 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0152] The relevant parameters of each lens in the optical lens of Example 5 are shown in Table 5-1.

[0153] Table 5-1

[0154]

[0155]

[0156] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 5 are shown in Table 5-2.

[0157] Table 5-2

[0158] Surface number K B C D E F S3 -1.83E+00 0.00E+00 3.48E-04 -1.10E-05 5.64E-07 -9.08E-09 S4 2.97E+02 0.00E+00 2.09E-03 -3.94E-05 -1.30E-06 6.98E-08 S5 3.00E+02 0.00E+00 5.04E-04 -2.11E-05 -2.01E-06 1.28E-07 S6 -6.90E-01 0.00E+00 1.59E-05 3.99E-06 -5.35E-07 4.26E-08 S14 -1.81E+02 0.00E+00 -7.67E-03 4.96E-04 -1.22E-04 1.44E-05 S15 -5.65E+01 0.00E+00 -1.13E-03 -7.96E-06 8.12E-05 -1.02E-06

[0159] As can be seen from Figure 11 , the MTF values of the present embodiment are all above 0.2 in the full field of view, and in the range of 0-230 lp / mm, the MTF curves uniformly and smoothly decrease from the center to the edge of the field of view, and in the low frequency and high frequency cases, both have acceptable imaging quality and acceptable detail resolution capability.

[0160] Embodiment 6

[0161] Referring to Figure 12 , a structural schematic diagram of the optical lens provided in Embodiment 6 of the present application is shown, and compared with Embodiment 1, the main difference is that the optical parameters such as the radii of curvature of the lens surfaces and the lens thicknesses are different.

[0162] The related parameters of the lenses in the optical lens in Embodiment 6 are shown in Table 6-1.

[0163] Table 6-1

[0164]

[0165]

[0166] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 6 are shown in Table 6-2.

[0167] Table 6-2

[0168] Surface number K B C D E F S3 -2.48E+00 0.00E+00 1.13E-03 -4.30E-05 2.39E-07 1.40E-08 S4 -1.90E+01 0.00E+00 2.56E-03 2.99E-07 1.26E-07 -1.09E-07 S5 3.20E+01 0.00E+00 7.84E-04 2.65E-05 2.88E-06 -9.57E-08 S6 -1.59E-01 0.00E+00 4.73E-04 7.70E-05 -1.36E-06 2.43E-07 S14 -7.85E+00 0.00E+00 -2.63E-03 -7.22E-04 2.72E-04 -2.93E-05 S15 -1.17E+00 0.00E+00 -2.98E-03 -1.09E-03 3.56E-04 -3.34E-05

[0169] As can be seen from Figure 13 , the MTF values of the present embodiment are all above 0.5 in the full field of view, and in the range of 0-230 lp / mm, the MTF curves uniformly and smoothly decrease from the center to the edge of the field of view, and in the low frequency and high frequency cases, both have excellent imaging quality and excellent detail resolution capability.

[0170] Embodiment 7

[0171] Referring to Figure 14 , a structural schematic diagram of the optical lens provided in Embodiment 7 of the present application is shown, and compared with Embodiment 1, the main difference is that the optical parameters such as the radii of curvature of the lens surfaces and the lens thicknesses are different.

[0172] The related parameters of the lenses in the optical lens in Embodiment 7 are shown in Table 7-1.

[0173] Table 7-1

[0174]

[0175]

[0176] The surface profile parameters of the aspherical lens of the optical lens in Example 7 are shown in Table 7-2.

[0177] Table 7-2

[0178] Surface number K B C D E F S3 -3.02E+00 0.00E+00 1.81E-03 -3.17E-05 3.19E-07 -1.48E-09 S4 -1.13E+01 0.00E+00 2.68E-03 -4.30E-05 2.18E-06 -1.84E-08 S5 -2.90E-01 0.00E+00 -2.21E-04 2.73E-06 1.51E-06 -5.51E-08 S6 2.46E+00 0.00E+00 2.21E-03 -1.13E-04 1.95E-05 -1.19E-06 S14 6.50E+01 0.00E+00 -1.10E-02 -3.26E-04 -2.85E-04 5.90E-05 S15 3.34E+00 0.00E+00 -4.82E-03 5.77E-05 -7.78E-05 2.98E-06

[0179] As can be seen from Figure 15 , the MTF value of the present embodiment is above 0.4 in the full field of view, and in the range of 0-230 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in low and high frequency cases.

[0180] Example 8

[0181] Referring to Figure 16 , a structural schematic diagram of the optical lens provided in Example 8 of the present application is shown, and the present embodiment mainly differs from Example 1 in that the optical parameters such as the radii of curvature of the surfaces of the lenses and the thicknesses of the lenses are different.

[0182] The related parameters of the lenses in the optical lens in Example 8 are shown in Table 8-1.

[0183] Table 8-1

[0184]

[0185]

[0186] The surface profile parameters of the aspherical lens of the optical lens in Example 8 are shown in Table 8-2.

[0187] Table 8-2

[0188] Surface number K B C D E F S3 -3.95E+00 0.00E+00 1.81E-03 -7.56E-05 1.50E-06 -1.10E-08 S4 3.00E+02 0.00E+00 2.61E-03 -4.70E-05 9.88E-07 -1.03E-07 S5 1.28E+02 0.00E+00 -1.66E-03 6.46E-05 -3.36E-06 3.86E-08 S6 6.46E+00 0.00E+00 -5.24E-05 8.99E-06 -4.25E-07 3.71E-08 S14 2.79E+02 0.00E+00 -8.96E-03 4.82E-05 -1.65E-04 1.42E-05 S15 2.37E+00 0.00E+00 -8.07E-03 4.02E-04 -7.38E-05 6.43E-06

[0189] As can be seen from Figure 17 , the MTF value of the present embodiment is above 0.45 in the full field of view, and in the range of 0-230 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in low and high frequency cases.

[0190] Example 9

[0191] Referring to Figure 18Figure 9 shows a structural schematic diagram of an optical lens provided in Embodiment 9 of the present application; compared with Embodiment 1, the main difference of the present embodiment lies in that the optical parameters such as the radius of curvature of each lens surface and the thickness of the lens are different.

[0192] The related parameters of each lens in the optical lens in Embodiment 9 are shown in Table 9-1.

[0193] Table 9-1

[0194]

[0195]

[0196] The surface type parameters of the aspherical lens of the optical lens in Embodiment 9 are shown in Table 9-2.

[0197] Table 9-2

[0198] Surface number K B C D E F S3 -5.02E+00 0.00E+00 1.34E-03 -2.06E-05 1.01E-07 2.10E-10 S4 -3.00E+02 0.00E+00 2.90E-03 -4.30E-05 3.20E-06 -2.51E-08 S5 5.56E+01 0.00E+00 -1.13E-03 2.90E-05 -8.61E-07 6.38E-08 S6 -5.03E-01 0.00E+00 -1.94E-05 6.46E-06 -2.04E-07 2.19E-08 S14 8.65E+00 0.00E+00 -1.24E-02 -2.82E-04 -3.28E-04 8.16E-06 S15 3.88E+00 0.00E+00 -8.94E-03 -2.26E-04 -1.31E-04 5.90E-06

[0199] It can be seen from Figure 19 that the MTF value of the present embodiment is above 0.4 in the full field of view, and in the range of 0-230 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0200] Embodiment 10

[0201] Please refer to Figure 20 Figure 10 shows a structural schematic diagram of an optical lens provided in Embodiment 10 of the present application; compared with Embodiment 1, the main difference of the present embodiment lies in that the optical parameters such as the radius of curvature of each lens surface and the thickness of the lens are different.

[0202] The related parameters of each lens in the optical lens in Embodiment 10 are shown in Table 10-1.

[0203] Table 10-1

[0204]

[0205] The surface type parameters of the aspherical lens of the optical lens in Embodiment 10 are shown in Table 10-2.

[0206] Table 10-2

[0207] Surface number K B C D E F S3 -4.55E+00 0.00E+00 8.61E-04 -2.43E-06 -8.22E-07 2.34E-08 S4 1.08E+02 0.00E+00 2.81E-03 -4.50E-05 1.09E-07 -5.36E-08 S5 1.74E+00 0.00E+00 -1.34E-03 4.68E-05 -7.50E-06 1.71E-07 S6 5.00E-01 0.00E+00 1.34E-04 4.17E-06 -4.96E-07 3.38E-08 S14 -3.06E+00 0.00E+00 -2.84E-03 -7.03E-04 -1.99E-04 5.54E-06 S15 2.42E+00 0.00E+00 -6.74E-03 -2.42E-03 -1.06E-04 -4.78E-05

[0208] It can be seen from Figure 21As can be seen, the MTF value of this embodiment is above 0.5 throughout the entire field of view. In the range of 0 to 230 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating excellent imaging quality and excellent detail resolution in both low and high frequency conditions.

[0209] Example 11

[0210] Please see Figure 22 The figure shown is a schematic diagram of the optical lens provided in Embodiment 11 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0211] The relevant parameters of each lens in the optical lens of Example 11 are shown in Table 11-1.

[0212] Table 11-1

[0213]

[0214] The surface profile parameters of the aspherical lens in the optical lens of Example 11 are shown in Table 11-2.

[0215] Table 11-2

[0216] Surface number K B C D E F S3 -1.73E+00 0.00E+00 1.72E-03 -8.99E-05 2.10E-06 -1.55E-08 S4 -7.51E-01 0.00E+00 3.27E-03 -8.27E-05 -2.96E-07 2.21E-08 S5 -3.04E+01 0.00E+00 3.52E-03 -1.12E-04 4.54E-06 -3.04E-08 S6 -6.21E+00 0.00E+00 4.20E-04 7.99E-05 -2.33E-06 2.48E-07 S14 -1.89E+01 0.00E+00 -1.10E-02 -7.38E-04 6.76E-05 -9.83E-06 S15 -5.23E+01 0.00E+00 -9.46E-03 -9.61E-04 2.34E-04 -1.96E-05

[0217] from Figure 23 As can be seen, the MTF value of this embodiment is above 0.5 throughout the entire field of view. In the range of 0 to 230 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating excellent imaging quality and excellent detail resolution in both low and high frequency conditions.

[0218] Example 12

[0219] Please see Figure 24 The figure shown is a schematic diagram of the optical lens provided in Embodiment 12 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0220] The relevant parameters of each lens in the optical lens of Example 12 are shown in Table 12-1.

[0221] Table 12-1

[0222]

[0223] The surface profile parameters of the aspherical lens in the optical lens of Example 12 are shown in Table 12-2.

[0224] Table 12-2

[0225] Surface number K B C D E F S3 -4.68E+00 0.00E+00 1.52E-03 -4.64E-05 6.47E-07 -2.56E-09 S4 -1.10E+02 0.00E+00 5.96E-03 -3.76E-04 2.93E-05 -1.02E-06 S5 -2.37E+02 0.00E+00 -1.48E-03 2.36E-05 5.25E-06 -3.38E-07 S6 3.42E+00 0.00E+00 6.08E-04 2.42E-05 -6.38E-07 7.09E-08 S14 2.81E+02 0.00E+00 -9.10E-03 7.94E-04 -7.20E-04 2.16E-04 S15 -3.00E+02 0.00E+00 -9.19E-03 6.17E-04 -2.59E-04 5.90E-05

[0226] As can be seen from Figure 25 , the MTF value of the embodiment is above 0.5 in the full field of view, and in the range of 0-230 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has excellent imaging quality and excellent detail resolution in both low and high frequency cases.

[0227] Embodiment 13

[0228] Please refer to Figure 26 , which is a structural schematic diagram of the optical lens provided in the embodiment 13 of the present application, and compared with the embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0229] The related parameters of each lens in the optical lens in the embodiment 13 are shown in Table 13-1.

[0230] Table 13-1

[0231]

[0232] The surface type parameters of the aspherical lens of the optical lens in the embodiment 13 are shown in Table 13-2.

[0233] Table 13-2

[0234] Surface number K B C D E F S3 -2.34E+00 0.00E+00 3.22E-03 -8.45E-05 1.62E-06 -1.24E-08 S4 -4.63E+00 0.00E+00 2.13E-03 3.56E-05 -2.52E-06 6.80E-08 S5 1.77E+01 0.00E+00 -2.72E-03 9.75E-05 -4.62E-06 1.73E-07 S6 -4.94E-01 0.00E+00 -4.78E-04 2.06E-05 -5.77E-07 2.34E-08 S14 3.04E+00 0.00E+00 -8.53E-03 -7.10E-05 -4.02E-04 3.55E-05 S15 8.00E+00 0.00E+00 -7.48E-03 -1.13E-04 -2.36E-04 1.30E-05

[0235] As can be seen from Figure 27 , the MTF value of the embodiment is above 0.5 in the full field of view, and in the range of 0-230 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has excellent imaging quality and excellent detail resolution in both low and high frequency cases.

[0236] Embodiment 14

[0237] Please refer to Figure 28 , which is a structural schematic diagram of the optical lens provided in the embodiment 14 of the present application, and compared with the embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0238] The related parameters of each lens in the optical lens in the embodiment 14 are shown in Table 14-1.

[0239] Table 14-1

[0240]

[0241] The surface shape parameters of the aspherical lens of the optical lens in embodiment 14 are shown in table 14-2.

[0242] Table 14-2

[0243] Surface number K B C D E F S3 -2.46E+00 0.00E+00 1.97E-03 -3.44E-05 3.75E-07 -1.93E-09 S4 -6.99E-01 0.00E+00 3.60E-03 -5.03E-05 1.48E-06 -1.52E-08 S5 -1.43E+01 0.00E+00 1.36E-03 -2.38E-05 1.34E-06 -4.20E-08 S6 -3.43E+00 0.00E+00 1.88E-03 5.27E-05 1.36E-06 -1.10E-07 S14 2.85E+02 0.00E+00 -5.47E-03 1.33E-04 -1.94E-04 4.49E-05 S15 3.48E+01 0.00E+00 -2.19E-03 -1.29E-04 2.78E-05 -8.60E-06

[0244] As can be seen from Figure 29 , the MTF values of the embodiment are all above 0.4 in the full field of view, and in the range of 0-230 lp / mm, the MTF curves uniformly and smoothly decrease from the center to the edge of the field of view, and have good imaging quality and good detail resolution ability in low and high frequency cases.

[0245] Embodiment 15

[0246] Please refer to Figure 30 , which is a structural schematic diagram of the optical lens provided in embodiment 15 of the application, and compared with embodiment 1, the main difference of the embodiment is that the optical parameters such as the radius of curvature of the prism and each lens surface, the lens thickness are different.

[0247] The related parameters of each lens in the optical lens in embodiment 15 are shown in table 15-1.

[0248] Table 15-1

[0249]

[0250] The surface shape parameters of the aspherical lens of the optical lens in embodiment 15 are shown in table 15-2.

[0251] Table 15-2

[0252] Surface number K B C D E F S3 -2.73E+00 0.00E+00 2.20E-03 -3.84E-05 3.26E-07 -1.26E-09 S4 -1.19E+01 0.00E+00 2.53E-03 -2.58E-05 1.56E-06 1.15E-08 S5 -3.00E+02 0.00E+00 -1.77E-03 9.59E-06 -3.59E-07 2.36E-08 S6 2.55E-01 0.00E+00 -1.49E-04 -2.78E-06 1.27E-07 -3.54E-10 S14 -6.58E+00 0.00E+00 -1.51E-03 2.80E-05 -3.34E-04 4.54E-05 S15 -9.03E-01 0.00E+00 -2.54E-03 2.50E-04 -2.28E-04 2.17E-05

[0253] As can be seen from Figure 31 , the MTF values of the embodiment are all above 0.4 in the full field of view, and in the range of 0-230 lp / mm, the MTF curves uniformly and smoothly decrease from the center to the edge of the field of view, and have good imaging quality and good detail resolution ability in low and high frequency cases.

[0254] Please refer to table 16, which is the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH, the entrance pupil diameter EPD, the chief ray angle of incidence CRA at the maximum image height, the maximum field of view angle FOV of the optical lens, and the numerical values corresponding to each conditional expression in each embodiment.

[0255] Table 16

[0256]

[0257]

[0258] Table 16

[0259]

[0260]

[0261] Table 16

[0262]

[0263] In summary of the above embodiments, the optical lens provided by the present application improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens by reasonable configuration of each lens surface and reasonable matching of optical power, so that the lens has one or more advantages such as super wide angle, high pixel, and high imaging quality.

[0264] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0265] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be noted that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens, eight pieces of lenses in total, characterized in that, In order from the object side to the imaging plane along the optical axis, the optical lens comprises in sequence: a first lens with negative refractive power, the object side surface of which is a convex surface and the image side surface of which is a concave surface; a second lens with negative refractive power, the object side surface of which is a concave surface and the image side surface of which is a convex surface; a third lens with positive refractive power; a fourth lens with positive refractive power, the image side surface of which is a convex surface; a fifth lens with positive refractive power; a sixth lens with negative refractive power; a seventh lens with positive refractive power; an eighth lens with negative refractive power; at least one of the fifth lens, the sixth lens and the seventh lens is a meniscus lens; the effective focal length f of the optical lens, the radian θ of the maximum half field angle and the real image height IH corresponding to the maximum field angle satisfy: 0.55<(IH / 2) / (f×θ)<1.0; the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 4.5<f4 / f≤13.73; the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 5.86≤TTL / IH<9.

0.

2. The optical lens of claim 1, wherein, a reflective element is arranged between the third lens and the fourth lens, the surface of the reflective element facing the object side is an incident surface, and the surface of the reflective element facing the imaging plane is an exit surface.

3. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the total optical length TTL satisfy: 22.98≤TTL / f<25.

0.

4. The optical lens of claim 1, wherein, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 5.86≤TTL / IH≤8.

52.

5. The optical lens of claim 1, wherein, the effective focal length f of the optical lens, the radian θ of the maximum half field angle and the real image height IH corresponding to the maximum field angle satisfy: 0.58≤(IH / 2) / (f×θ)≤0.

95.

6. The optical lens of claim 1, wherein, the effective focal length f of the optical lens, the maximum field angle FOV and the real image height IH corresponding to the maximum field angle satisfy: 58.0°<(f×FOV) / IH≤98.12°.

7. The optical lens of claim 1, wherein, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -9.38≤f1 / f<-4.

5.

8. The optical lens of claim 1, wherein, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -9.52≤f2 / f<-3.

5.

9. The optical lens of claim 1, wherein, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 4.6≤f4 / f≤13.

73.

10. The optical lens of claim 1, wherein, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 2.8<f5 / f≤25.

68.

11. The optical lens of claim 1, wherein, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -6.5<f6 / f<-1.

2.

12. The optical lens of claim 1, wherein, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.2<f7 / f<5.

5.

13. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the image side surface curvature radius R8 of the fourth lens satisfy: -17.50≤R8 / f<-4.

0.

14. The optical lens of claim 1, wherein, the object side surface curvature radius R3 of the second lens and the image side surface curvature radius R4 of the second lens satisfy: -0.95<(R3-R4) / (R3+R4)<-0.

15.

15. The optical lens of claim 1, wherein, A spacing distance CT34 of the third lens and the fourth lens on the optical axis satisfies: 1.0 < CT34 / f < 6.

5.

16. The optical lens of claim 1, wherein, A sum ∑CT of the center thicknesses of the first lens to the eighth lens satisfies: 0.35 < ∑CT / TTL < 0.55.

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