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; 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, wherein an object side surface of the sixth lens is a concave surface, and an image side surface of the sixth lens is a convex surface; a seventh lens with positive optical power, wherein an object side surface of the seventh lens is a concave surface, and an image side surface of the seventh lens is a convex surface; 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; 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, the object side surface of which is concave, and the image side surface of which is convex; a seventh lens with positive focal power, the object side surface of which is concave, and the image side surface of which is convex; and an eighth lens with negative focal power.

[0007] 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.

[0008] Further preferably, the effective focal length f of the optical lens and the total optical length TTL satisfy: TTL / f < 25.0.

[0009] Further preferably, 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 < 9.5.

[0010] It is further preferred that the effective focal length f of the optical lens and 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 x θ) < 0.90.

[0011] It is further preferred that the effective focal length f of the optical lens and the optical back focal length BFL satisfy: BFL / f > 0.75.

[0012] It is further preferred that 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: 65.0 < (f x FOV) / IH.

[0013] It is further preferred that the real image height IHm corresponding to the central field angle of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 0.55 < IHm / IH.

[0014] 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.

[0015] 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 < -2.5.

[0016] It is further preferred that the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 5.0 < f3 / f.

[0017] It is further preferred that the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 3.5 < f4 / f.

[0018] It is further preferred that the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 2.9 < f5 / f.

[0019] It is further preferred that the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: f6 / f < -3.0.

[0020] It is further preferred that the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 3.2 < f7 / f.

[0021] 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 < -3.3.

[0022] It is further preferred that the effective focal length f of the optical lens and the image side face curvature radius R8 of the fourth lens satisfy: R8 / f < -5.0.

[0023] It is further preferred that the effective focal length f of the optical lens and the radius of curvature R13 on the object side of the seventh lens satisfy: R13 / f <-14.0.

[0024] It is further preferred that the radius of curvature R11 on the object side of the sixth lens and the radius of curvature R12 on the image side satisfy: -0.45<(R11-R12) / (R11+R12)<-1.0.

[0025] It is further preferred that the radius of curvature R13 on the object side of the seventh lens and the radius of curvature R14 on the image side satisfy: 0.7<(R13-R14) / (R13+R14)<1.0.

[0026] 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: 3.5<CT34 / f<9.5.

[0027] 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: 0.30<∑CT / TTL<0.50.

[0028] 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. BRIEF DESCRIPTION OF DRAWINGS

[0029] 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:

[0030] Figure 1 The structure schematic diagram of the optical lens in the example of the present application is shown.

[0031] Figure 2 The structure schematic diagram of the optical lens in the example 1 of the present application is shown.

[0032] Figure 3 The MTF curve diagram of the optical lens in the example 1 of the present application is shown.

[0033] Figure 4 The structure schematic diagram of the optical lens in the example 2 of the present application is shown.

[0034] Figure 5 The MTF curve diagram of the optical lens in the example 2 of the present application is shown.

[0035] Figure 6 The structure schematic diagram of the optical lens in the example 3 of the present application is shown.

[0036] Figure 7 MTF curve diagram of the optical lens in embodiment 3 of the present application.

[0037] Figure 8 Structural schematic diagram of the optical lens in embodiment 4 of the present application.

[0038] Figure 9 MTF curve diagram of the optical lens in embodiment 4 of the present application.

[0039] Figure 10 Structural schematic diagram of the optical lens in embodiment 5 of the present application.

[0040] Figure 11 MTF curve diagram of the optical lens in embodiment 5 of the present application.

[0041] Figure 12 Structural schematic diagram of the optical lens in embodiment 6 of the present application.

[0042] Figure 13 MTF curve diagram of the optical lens in embodiment 6 of the present application.

[0043] Figure 14 Structural schematic diagram of the optical lens in embodiment 7 of the present application.

[0044] Figure 15 MTF curve diagram of the optical lens in embodiment 7 of the present application.

[0045] Figure 16 Structural schematic diagram of the optical lens in embodiment 8 of the present application.

[0046] Figure 17 MTF curve diagram of the optical lens in embodiment 8 of the present application.

[0047] Figure 18 Structural schematic diagram of the optical lens in embodiment 9 of the present application.

[0048] Figure 19 MTF curve diagram of the optical lens in embodiment 9 of the present application.

[0049] Figure 20 Structural schematic diagram of the optical lens in embodiment 10 of the present application.

[0050] Figure 21 MTF curve diagram of the optical lens in embodiment 10 of the present application.

[0051] Figure 22 Structural schematic diagram of the optical lens in embodiment 11 of the present application.

[0052] Figure 23 MTF curve diagram of the optical lens in embodiment 11 of the present application.

[0053] The following detailed description will further describe the present application with reference to the above figures. DETAILED DESCRIPTION

[0054] For a better understanding of the present application, various aspects of the present application will be described in greater detail below with reference to the figures. It should be appreciated that these details are just for embodiments of the present application and are not intended to limit the scope of the present application in any manner. Throughout the specification, like drawing reference numerals will be understood to refer to like parts throughout the specification and the figures. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0055] It should be noted that the expressions first, second, third, etc. in the present specification are merely used to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, 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.

[0056] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0057] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0058] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, signify the presence of the stated features, elements, and / or components but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. Furthermore, when describing the embodiments of the present application, the use of "may" indicates that one or more embodiments of the present application. Also, the expression "exemplary" is intended to mean an example or an illustration.

[0059] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an overly idealized or overly formal sense unless expressly so defined herein.

[0060] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0061] Examples

[0062] Please refer to Figure 1 , the structure of the optical lens in the example of the present application is shown in the schematic diagram. 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 optical lens coordinate system after the prism is changed, and the lens curvature radius R and the thickness D after the prism are opposite numbers. 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 patent scope of the present application. Figure 1 The difference between (A) and (C) is that the prism structure is cancelled in (C). The reason for this phenomenon is that the optical path of the optical lens is designed as a fold-back structure during the design process to facilitate assembly in a small space. It should be noted that the purpose of adding the fold-back structure is to improve the compactness of the optical lens, and it cannot be understood as a limitation of the patent scope of the present application.

[0063] The optical lens provided by the embodiment of the present application has 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.

[0064] 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.

[0065] In some embodiments, the second lens can have negative refractive power, which helps to gently transition the light rays, expand the field of view of the optical imaging lens, reduce the difficulty of correcting distortion and chromatic aberration of the rear lens, and improve the image quality of the optical imaging lens. The object side of the second lens is concave, which is conducive to cooperating with the image side of the first lens, so that the light rays can be smoothly accepted by the second lens, reducing the front aperture of the optical lens, and being conducive to the miniaturization of the optical lens.

[0066] In some embodiments, the third lens can have positive refractive power, which helps to improve the light converging ability of the optical lens, while balancing various aberrations generated by the optical lens, and improving 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.

[0067] In some embodiments, the fourth lens can have positive refractive power, which helps to improve the light converging ability of the optical lens, while balancing various aberrations of the optical lens, and improving the imaging quality of the optical lens. The image side of the fourth lens is convex, which can fold and converge the light rays, share the converging effect of the third lens on the light rays, help the light rays enter the fifth lens more gently, reduce the aperture of the rear lens group, and reduce the sensitivity of the optical lens.

[0068] In some embodiments, the fifth lens can have positive refractive power, which helps to improve the light converging ability of the optical lens, while balancing various aberrations of the optical lens, and improving 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.

[0069] In some embodiments, the sixth lens can have negative refractive power, which helps to diverge the light rays converged by the fourth lens and the fifth lens, so that they can reach a higher imaging position. The object side of the sixth lens is concave, and the image side is convex, which can reduce the ghost energy of the light rays reflected by the object side of the sixth lens, thereby reducing the ghost energy on the imaging screen; at the same time, it can also suppress the exit angle of the light rays in the edge field of view, which is conducive to reducing the rear aperture of the optical lens.

[0070] In some embodiments, the seventh lens can have positive refractive power, which helps to further converge the light rays, and in combination with the sixth lens having negative refractive power, it can correct chromatic aberration. The object side of the seventh lens is concave, and the image side is convex, which is conducive to gently converging the light rays, shortening the distance to the next lens, and reducing the total length of the optical lens.

[0071] In some embodiments, the eighth lens can have a negative refractive power, which is beneficial for diverging the incident light rays and turning the peripheral light rays and the central light rays upward to 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.

[0072] 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 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 to a greater extent and reduce various aberrations, and the sixth lens to the eighth lens can be used for the function of correcting aberrations, which is beneficial to balance the structure of the entire optical system. In addition, when the diaphragm is located between the fifth lens and the sixth lens, the diaphragm aberration correction is facilitated.

[0073] In some embodiments, the optical lens can further include a filter, which is arranged 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.

[0074] In some embodiments, in order to reduce the size of the optical lens, a reflection element with no refractive power for light path folding can be arranged between the third lens and the fourth lens, and the reflection element is a prism. The surface of the prism facing the object side is an incident surface, and the surface facing the imaging surface is an exit surface. Both the incident surface and the exit surface are flat. 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.

[0075] 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.

[0076] 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 < 9.5. 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.

[0077] In some embodiments, 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 x θ) < 0.90. Satisfying the above range indicates that the structure has high design flexibility, can effectively control the distortion range, and meets the requirements of different distortion algorithms.

[0078] In some embodiments, the effective focal length f of the optical lens and the optical back focal length BFL satisfy: BFL / f > 0.75. Satisfying the above range can make the lens have a large back focus, which is beneficial for the assembly of the module, reduces interference, and improves production yield.

[0079] In some embodiments, 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: 65.0 < (f x FOV) / IH. Satisfying the above range is beneficial for meeting the requirements of a large field of view of the optical lens, while realizing a large image height and a long focal length, and is more beneficial for realizing small distortion and improving the imaging quality of the optical lens.

[0080] In some embodiments, the real image height IHm corresponding to the central field angle of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 0.55 < IHm / IH. Satisfying the above range can effectively improve the proportion of the central field imaging range in the entire imaging range, and compared with lenses with the same field angle, the proportion of the central field imaging range in the entire imaging range is larger, and more detailed information can be obtained.

[0081] In some embodiments, the focal length f1 of the first lens and the 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 focal power, avoid excessive concentration of negative focal power, and at the same time, be beneficial for increasing the field angle and collecting as much edge field light as possible into the rear optical lens to realize large-angle light collection.

[0082] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: f2 / f < -2.5. Satisfying the above range can make the second lens have appropriate negative focal power, increase the field angle, and improve the imaging quality of the optical lens.

[0083] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 5.0 < f3 / f. Satisfying the above range can make the third lens have appropriate positive focal power, which is beneficial for improving the light convergence ability of the optical lens, and at the same time, can balance various aberrations generated by the optical lens and improve the imaging quality of the optical lens.

[0084] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 3.5 < f4 / f. Satisfying the above range, the fourth lens can have appropriate positive refractive power, which is conducive to improving the light converging capability of the optical lens, while balancing the aberration of the optical lens and improving the imaging quality of the optical lens.

[0085] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 2.9 < f5 / f. Satisfying the above range, the fifth lens can have appropriate positive refractive power, which is conducive to improving the light converging capability of the optical lens, while balancing the aberration of the optical lens and improving the imaging quality of the optical lens.

[0086] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: f6 / f <-3.0. Satisfying the above range, the sixth lens can have appropriate negative refractive power, which is conducive to diverging the light converging through the fourth lens and the fifth lens, and increasing the image height of the optical lens.

[0087] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 3.2 < f7 / f. Satisfying the above range, the seventh lens can have appropriate positive refractive power, which is conducive to suppressing the angle of light exiting the edge field of view.

[0088] In some embodiments, the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: f8 / f <-3.3. Satisfying the above range, the eighth lens can have appropriate negative refractive power, which is conducive to diverging the light, making the peripheral light and the central light turn up to a higher imaging position.

[0089] 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 <-5.0. Satisfying the above range, the image side of the fourth lens is relatively flat, and the light has less influence on the light trend when passing through the image side of the fourth lens, which is conducive to reducing the CRA of the optical lens.

[0090] In some embodiments, the effective focal length f of the optical lens and the object side curvature radius R13 of the seventh lens satisfy: R13 / f <-14.0. Satisfying the above range, the seventh lens can have a larger focal length, which can reduce the influence of temperature change on the back focal length of the lens, realize thermal stability of the optical lens, and at the same time be conducive to smooth transition of light, avoid excessive convergence of light, and improve the imaging quality of the optical lens.

[0091] In some embodiments, the object-side surface radius of curvature R11 of the sixth lens and the image-side surface radius of curvature R12 satisfy: -0.45 < (R11-R12) / (R11+R12) < -1.0. Satisfying the above range can suppress the exit angle of the marginal field rays, which is conducive to reducing the back focal length of the optical lens.

[0092] In some embodiments, the object-side surface radius of curvature R13 of the seventh lens and the image-side surface radius of curvature R14 satisfy: 0.7 < (R13-R14) / (R13+R14) < 1.0. Satisfying the above range is conducive to gently converging the light rays, which can shorten the distance to the next lens and is conducive to reducing the total length of the optical lens.

[0093] In some embodiments, the separation 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: 3.5 < CT34 / f < 9.5. Satisfying the above range can achieve the folding structure of the optical lens and reduce the thickness of the lens.

[0094] 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: 0.30 < ∑CT / TTL < 0.50. Satisfying the above range is conducive to compressing the total length and volume of the optical lens and maintaining the miniaturization of the optical lens.

[0095] In some embodiments, the optical lens satisfies the condition: FOV > 180°, 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, 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 by the embodiments has at least one of the characteristics of super wide angle and large image surface.

[0096] In some embodiments, the sixth lens and the seventh lens can be cemented to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the sensitivity of the optical lens to decentration, balance the aberration of the optical lens, and improve the imaging quality of the optical lens. In addition, the cemented lens can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0097] 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 adopt a spherical lens or an aspherical lens. Compared with a spherical structure, an aspherical structure 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 adopt an aspherical lens, and the first lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens can adopt a spherical lens.

[0098] In various embodiments of the application, when the lens adopts an aspherical lens, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0099]

[0100] 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 respectively the fourth-order, sixth-order, eighth-order, tenth-order and twelfth-order surface coefficients.

[0101] 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, 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.

[0102] Embodiment 1

[0103] 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 sequence along the optical axis from the object side to the imaging surface, 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.

[0104] 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 and the image side S4 are both concave surfaces; the third lens L3 has positive focal power, the object side S5 and the image side S6 are both convex surfaces; the prism has a plane as the object side and a plane as the image side; the fourth lens L4 has positive focal power, 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 and the image side S10 are both convex surfaces; the sixth lens L6 has negative focal power, the object side S11 is a concave surface, and the image side S12 is a convex surface; the seventh lens L7 has positive focal power, the object side S12 is a concave surface, and the image side S13 is a convex 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.

[0105] 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.

[0106] The related parameters of the lenses in the optical lens in Embodiment 1 are shown in Table 1-1.

[0107] Table 1-1

[0108]

[0109] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 1 are shown in Table 1-2.

[0110] Table 1-2

[0111]

[0112]

[0113] In this embodiment, Figure 3 The MTF (modulation transfer function) curve of Embodiment 1 is shown, which represents the lens imaging modulation degree of different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of this embodiment is above 0.4 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.

[0114] Embodiment 2

[0115] Referring to FIG. 2, a structural schematic diagram of an optical lens provided in Embodiment 2 of the present application is shown, and the main difference between this embodiment and Embodiment 1 is that the radius of curvature, lens thickness and other optical parameters of the lens surface are different. Figure 4

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

[0117] Table 2-1

[0118]

[0119] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 2 are shown in Table 2-2.

[0120] Table 2-2

[0121]

[0122]

[0123] From Table 2-2, it can be seen that the MTF value of this embodiment is above 0.45 in the full field of view, and the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view in the range of 0-230 lp / mm, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency. Figure 5 Embodiment 3

[0124] Referring to FIG. 3, a structural schematic diagram of an optical lens provided in Embodiment 3 of the present application is shown, and the main difference between this embodiment and Embodiment 1 is that the radius of curvature, lens thickness and other optical parameters of the lens surface are different.

[0125] Figure 6

[0126] The related parameters of the lenses in the optical lens in Embodiment 3 are shown in Table 3-1.

[0127] Table 3-1

[0128]

[0129] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 3 are shown in Table 3-2.

[0130] Table 3-2

[0131]

[0132]

[0133] From Table 3-2, it can be seen that the MTF value of this embodiment is above 0.45 in the full field of view, and the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view in the range of 0-230 lp / mm, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency. Figure 7 ​​​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.

[0134] Example 4

[0135] 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.

[0136] The relevant parameters of each lens in the optical lens of Example 4 are shown in Table 4-1.

[0137] Table 4-1

[0138]

[0139] The surface profile parameters of the aspherical lens in Example 4 are shown in Table 4-2.

[0140] Table 4-2

[0141]

[0142]

[0143] from Figure 9 As can be seen, the MTF value of this embodiment is above 0.35 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.

[0144] Example 5

[0145] 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.

[0146] The relevant parameters of each lens in the optical lens of Example 5 are shown in Table 5-1.

[0147] Table 5-1

[0148]

[0149] The surface profile parameters of the aspherical lens in Example 5 are shown in Table 5-2.

[0150] Table 5-2

[0151]

[0152]

[0153] from Figure 11 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.

[0154] Example 6

[0155] Please see Figure 12 The figure shown is a schematic diagram of the structure of the optical lens provided in Embodiment 6 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.

[0156] The relevant parameters of each lens in the optical lens of Example 6 are shown in Table 6-1.

[0157] Table 6-1

[0158]

[0159] The surface profile parameters of the aspherical lens in the optical lens of Example 6 are shown in Table 6-2.

[0160] Table 6-2

[0161]

[0162]

[0163] from Figure 13 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.

[0164] Example 7

[0165] Please see Figure 14 The figure shown is a schematic diagram of the structure of the optical lens provided in Embodiment 7 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.

[0166] The relevant parameters of each lens in the optical lens of Example 7 are shown in Table 7-1.

[0167] Table 7-1

[0168]

[0169] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 7 are shown in Table 7-2.

[0170] Table 7-2

[0171] Surface No. K B C D E F S3 -1.48E+00 0.00E+00 1.27E-03 -1.87E-05 -6.48E-07 2.80E-08 S4 9.96E+00 0.00E+00 -1.30E-04 3.93E-05 -1.52E-06 -3.26E-08 S5 2.23E+01 0.00E+00 -1.18E-03 2.33E-05 -8.50E-07 1.17E-08 S6 9.13E-02 0.00E+00 7.72E-05 -9.11E-06 -1.16E-07 1.40E-08 S14 -1.55E+00 0.00E+00 -4.52E-03 -4.67E-04 -9.80E-05 4.10E-06 S15 6.01E+00 0.00E+00 -6.71E-03 -1.95E-03 1.94E-04 -4.97E-05

[0172] As can be seen from Figure 15 , the MTF value of the present 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 ability in low and high frequency cases.

[0173] Embodiment 8

[0174] Referring to Figure 16 , the structural schematic diagram of the optical lens provided in Embodiment 8 of the present application is shown, and compared with 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.

[0175] The related parameters of each lens in the optical lens in Embodiment 8 are shown in Table 8-1.

[0176] Table 8-1

[0177]

[0178] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 8 are shown in Table 8-2.

[0179] Table 8-2

[0180] Surface No. 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

[0181] As can be seen from Figure 17 , the MTF value of the present 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 ability in low and high frequency cases.

[0182] Embodiment 9

[0183] Referring to Figure 18 , the structural schematic diagram of the optical lens provided in Embodiment 9 of the present application is shown, and compared with 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.

[0184] The relevant parameters of each lens in the optical lens of Example 9 are shown in Table 9-1.

[0185] Table 9-1

[0186]

[0187] The surface profile parameters of the aspherical lens in the optical lens of Example 9 are shown in Table 9-2.

[0188] Table 9-2

[0189] Surface No. K B C D E F S3 -9.47E+00 0.00E+00 3.19E-05 -2.02E-05 6.71E-07 1.87E-09 S4 4.37E+00 0.00E+00 1.21E-03 -1.02E-04 -1.38E-06 -2.48E-07 S5 -3.43E+01 0.00E+00 -1.10E-03 -1.14E-04 -2.58E-06 2.41E-07 S6 1.31E+02 0.00E+00 -1.12E-03 -2.63E-05 -1.45E-06 4.47E-07 S14 -2.89E+02 0.00E+00 -3.38E-03 2.88E-04 -1.52E-04 2.87E-05 S15 -3.96E+01 0.00E+00 1.02E-03 4.35E-04 3.57E-05 1.77E-05

[0190] from Figure 19 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.

[0191] Example 10

[0192] Please see Figure 20 The figure shown is a schematic diagram of the structure of the optical lens provided in Embodiment 10 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.

[0193] The relevant parameters of each lens in the optical lens of Example 10 are shown in Table 10-1.

[0194] Table 10-1

[0195]

[0196] The surface profile parameters of the aspherical lens in the optical lens of Example 10 are shown in Table 10-2.

[0197] Table 10-2

[0198] Surface No. K B C D E F S3 -1.84E+00 0.00E+00 5.80E-04 -9.12E-06 -4.79E-08 2.55E-09 S4 2.31E+01 0.00E+00 7.76E-04 -1.05E-05 -1.93E-07 -2.16E-08 S5 -1.61E+01 0.00E+00 4.90E-04 1.17E-05 -3.10E-07 6.18E-09 S6 -6.62E+00 0.00E+00 4.80E-04 2.46E-05 -8.18E-07 6.15E-08 S14 -6.53E+00 0.00E+00 -2.11E-03 -1.09E-04 5.23E-06 -1.65E-06 S15 1.47E+00 0.00E+00 -3.00E-03 -5.89E-05 4.20E-05 -2.32E-06

[0199] from Figure 21 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.

[0200] Example 11

[0201] Please see Figure 22The 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.

[0202] The relevant parameters of each lens in the optical lens of Example 11 are shown in Table 11-1.

[0203] Table 11-1

[0204]

[0205] The surface profile parameters of the aspherical lens in the optical lens of Example 11 are shown in Table 11-2.

[0206] Table 11-2

[0207] Surface No. K B C D E F S3 -9.68E-02 0.00E+00 6.87E-04 5.10E-06 -1.51E-07 2.05E-09 S4 1.08E-01 0.00E+00 -2.48E-04 2.81E-05 3.67E-06 -2.11E-07 S5 2.63E+00 0.00E+00 -4.64E-04 3.60E-06 1.31E-06 -1.42E-07 S6 1.37E+02 0.00E+00 -1.23E-04 4.79E-06 -9.76E-07 6.75E-09 S14 6.33E+00 0.00E+00 -1.13E-02 -3.38E-04 -6.01E-05 9.70E-06 S15 2.03E+02 0.00E+00 -8.32E-03 1.59E-04 2.39E-05 -5.34E-07

[0208] 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 good imaging quality and good detail resolution in both low and high frequency conditions.

[0209] Please refer to Table 12 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH, entrance pupil diameter EPD, principal ray incident angle CRA at maximum image height, and maximum field of view FOV, as well as the values ​​corresponding to each conditional expression in each embodiment.

[0210] Table 12

[0211]

[0212]

[0213] Continued from Table 12

[0214] Parameter and Conditional Expression Example 7 Example 8 Example 9 Example 10 Example 11 f (mm) 1.45 1.52 1.81 1.83 2.03 FOV (°) 200.00 200.00 200.00 200.00 200.00 EPD (mm) 0.73 0.76 0.91 0.92 1.02 TTL (mm) 35.00 35.00 35.00 35.00 35.00 Fno 2.00 2.00 2.00 2.00 2.00 IH (mm) 4.09 4.11 3.78 4.19 5.64 IHm (mm) 2.44 2.52 2.75 2.92 3.40 CRA (°) 25.39 26.79 23.24 23.04 21.46 BFL (mm) 1.80 1.80 1.89 1.81 3.36 TTL / f 24.11 22.98 19.34 19.12 17.24 TTL / IH 8.55 8.52 9.25 8.35 6.20 (IH / 2) / (f x θ) 0.81 0.77 0.60 0.66 0.80 BFL / f 1.24 1.18 1.04 0.99 1.65 (f x FOV) / IH 70.93 74.14 95.72 87.29 71.94 IHm / IH 0.60 0.61 0.73 0.70 0.60 f1 / f -5.56 -6.27 -8.72 -6.28 -5.70 f2 / f -3.46 -5.57 -2.80 -3.70 -3.07 f3 / f 7.32 14.56 8.44 6.92 19.01 f4 / f 9.57 12.27 5.66 4.15 5.02 f5 / f 4.10 3.54 3.89 10.91 3.76 f6 / f -4.55 -4.34 -5.99 -3.45 -4.88 f7 / f 4.97 5.18 5.26 3.85 3.54 f8 / f -76.58 -73.11 -11.92 -63.05 -7.54 R3 / f -13.46 -6.86 -9.25 -9.13 -5.57 R13 / f -87.44 -88.79 -100.08 -1422.90 -26.75 (R11-R12) / (R11+R12) -0.91 -0.92 -0.90 -0.995 -0.76 (R13-R14) / (R13+R14) 0.93 0.94 0.93 0.996 0.87 CT34 / f 6.93 5.60 9.23 4.55 4.26 ∑CT / TTL 0.39 0.42 0.33 0.44 0.43

[0215] In summary, the optical lens provided by the present invention improves the imaging quality, reduces aberrations, and enhances the imaging quality of the optical lens through the reasonable configuration of each lens surface shape and the reasonable matching of optical power, so that the lens has one or more advantages such as ultra-wide angle, high pixel, and high imaging quality.

[0216] 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 expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0217] The above-described embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the patent scope of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within 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; 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, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a seventh lens with positive refractive power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; an eighth lens with negative refractive power; The effective focal length f, the maximum field of view FOV and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 65.0°<(f×FOV) / IH≤95.72°. The focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 3.2<f7 / f≤6.

24. The optical total length TTL of the optical lens and the real image height IH corresponding to the maximum field of view satisfy: 5.98≤TTL / IH<9.

5.

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 surface is an exit surface.

3. The optical lens of claim 1, wherein, The effective focal length f and the optical total length TTL of the optical lens satisfy: 24.11≤TTL / f<25.

0.

4. The optical lens of claim 1, wherein, The optical total length TTL of the optical lens and the real image height IH corresponding to the maximum field of view satisfy: 5.98≤TTL / IH≤9.

25.

5. The optical lens of claim 1, wherein, The effective focal length f, the maximum half field of view radian θ and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.55<(IH / 2) / (f×θ)<0.

90.

6. The optical lens of claim 1, wherein, The effective focal length f, the maximum field of view FOV and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 66.43°≤(f×FOV) / IH≤95.72°.

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: -8.72≤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: -8.59≤f2 / f<-2.

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: 3.5<f4 / f≤12.

27.

10. 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: -9.08≤f6 / f<-3.

0.

11. 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: 3.54≤f7 / f≤6.

24.

12. The optical lens of claim 1, wherein, The focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: -76.58≤f8 / f<-3.

3.

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: -29.76≤R8 / f<-5.

0.

14. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the object side surface curvature radius R13 of the seventh lens satisfy: -1422.90≤R13 / f<-14.

0.

15. The optical lens of claim 1, wherein, The object side surface curvature radius R11 of the sixth lens and the image side surface curvature radius R12 satisfy: -0.45 < (R11-R12) / (R11+R12) < -1.

0.

16. The optical lens of claim 1, wherein, The object side surface curvature radius R13 of the seventh lens and the image side surface curvature radius R14 satisfy: 0.7 < (R13-R14) / (R13+R14) < 1.

0.

17. The optical lens of claim 1, wherein, 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: 3.5 < CT34 / f < 9.

5.

18. The optical lens of claim 1, wherein, 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: 0.30 < ∑CT / TTL < 0.50.

Images