Optical lens

Abstract

The application provides an optical lens, which comprises seven lenses in sequence along an optical axis from an object side to an imaging surface, and the seven lenses comprise: a first lens with negative optical power, wherein an image side of the first lens is a concave surface; a second lens with negative optical power; a third lens with positive optical power, wherein an object side of the third lens is a concave surface, and an image side of the third lens is a convex surface; a fourth lens with negative optical power, wherein an object side of the fourth lens is a concave surface; a fifth lens with positive optical power; a sixth lens with positive optical power; and a seventh lens with negative optical power; wherein a curvature radius R5 of the object side of the third lens and a curvature radius R6 of the image side of the third lens satisfy: 0<(R5-R6) / (R5+R6)<1. The optical lens has a large field of view and high resolving power, has good imaging quality, and has clear imaging of an edge field of view through reasonable configuration of each lens surface type and reasonable matching of optical power.

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 improvement of people's requirements for driving experience, vehicle application type optical lenses are used more and more in intelligent driving, and vehicle optical lenses are playing an increasingly important role in the automobile industry.

[0003] Advanced Driver Assistance System (ADAS) plays an important role in intelligent driving. It collects environmental information through various lenses and sensors to ensure the safety of drivers. The existing side-view lens of ADAS system needs to set multiple lenses on both sides of the vehicle body to realize the fusion of the viewing angle, and there is a problem of poor imaging quality at the edge of the field of view, which cannot clearly distinguish obstacles. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide an optical lens with the advantages of good edge field of view imaging effect.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is:

[0006] An optical lens, a total of seven lenses, including in order along the optical axis from the object side to the imaging surface:

[0007] The first lens with negative focal power, the image side surface is concave;

[0008] The second lens with negative focal power;

[0009] The third lens with positive focal power, the object side surface is concave, and the image side surface is convex;

[0010] The fourth lens with negative focal power, the object side surface is concave;

[0011] The fifth lens with positive focal power;

[0012] The sixth lens with positive focal power;

[0013] The seventh lens with negative focal power;

[0014] Wherein, the object side surface curvature radius R5 of the third lens and the image side surface curvature radius R6 of the third lens satisfy: 0<(R5-R6) / (R5+R6)<0.98.

[0015] Further preferably, the effective focal length f of the optical lens and the total optical length TTL of the optical lens satisfy: TTL / f>12.

[0016] It is further preferred that a maximum field of view FOV of the optical lens and an aperture value Fno of the optical lens satisfy: 70°<FOV / Fno<100°.

[0017] It is further preferred that an effective focal length f of the optical lens and a focal length f1 of the first lens satisfy: f1 / f<-5.

[0018] It is further preferred that an effective focal length f of the optical lens and a focal length f2 of the second lens satisfy: f2 / f<-2.5.

[0019] It is further preferred that an effective focal length f of the optical lens and a focal length f4 of the fourth lens satisfy: f4 / f<-15.

[0020] It is further preferred that an effective focal length f of the optical lens and a back focal length BFL of the optical lens satisfy: BFL / f>1.5.

[0021] It is further preferred that an effective focal length f of the optical lens and a back focal length BFL of the optical lens satisfy: BFL / f>1.5.

[0022] It is further preferred that an effective focal length f of the optical lens and a back focal length BFL of the optical lens satisfy: BFL / f>1.5.

[0023] The optical lens provided by the present application has a large field of view and high resolving power by reasonable configuration of each lens surface and reasonable matching of optical power, and has good imaging quality and clear edge field of view imaging. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0026] Figure 2 FIG. 2 is a field curvature curve of the optical lens according to the embodiment of the present application.

[0027] Figure 3 FIG. 3 is an F-θ distortion curve of the optical lens according to the embodiment of the present application.

[0028] Figure 4 FIG. 4 is a relative luminance curve of the optical lens according to the embodiment of the present application.

[0029] Figure 5 FIG. 5 is an MTF curve of the optical lens according to the embodiment of the present application.

[0030] Figure 6Structure diagram of the optical lens in embodiment 2 of the present application.

[0031] Figure 7 Field curvature curve diagram of the optical lens in embodiment 2 of the present application.

[0032] Figure 8 F-θ distortion curve of the optical lens in embodiment 2 of the present application.

[0033] Figure 9 Relative luminance curve diagram of the optical lens in embodiment 2 of the present application.

[0034] Figure 10 MTF curve diagram of the optical lens in embodiment 2 of the present application.

[0035] Figure 11 Structure diagram of the optical lens in embodiment 3 of the present application.

[0036] Figure 12 Field curvature curve diagram of the optical lens in embodiment 3 of the present application.

[0037] Figure 13 F-θ distortion curve of the optical lens in embodiment 3 of the present application.

[0038] Figure 14 Relative luminance curve diagram of the optical lens in embodiment 3 of the present application.

[0039] Figure 15 MTF curve diagram of the optical lens in embodiment 3 of the present application.

[0040] Figure 16 Structure diagram of the optical lens in embodiment 4 of the present application.

[0041] Figure 17 Field curvature curve diagram of the optical lens in embodiment 4 of the present application.

[0042] Figure 18 F-θ distortion curve of the optical lens in embodiment 4 of the present application.

[0043] Figure 19 Relative luminance curve diagram of the optical lens in embodiment 4 of the present application.

[0044] Figure 20 MTF curve diagram of the optical lens in embodiment 4 of the present application.

[0045] Figure 21 Structure diagram of the optical lens in embodiment 5 of the present application.

[0046] Figure 22 Field curvature curve diagram of the optical lens in embodiment 5 of the present application.

[0047] Figure 23 F-theta distortion curve of the optical lens in Embodiment 5 of the present application.

[0048] Figure 24 Relative illumination curve of the optical lens in Embodiment 5 of the present application.

[0049] Figure 25 MTF curve of the optical lens in Embodiment 5 of the present application.

[0050] Figure 26 Structure diagram of the optical lens in Embodiment 6 of the present application.

[0051] Figure 27 Curvature of field curve of the optical lens in Embodiment 6 of the present application.

[0052] Figure 28 F-theta distortion curve of the optical lens in Embodiment 6 of the present application.

[0053] Figure 29 Relative illumination curve of the optical lens in Embodiment 6 of the present application.

[0054] Figure 30 MTF curve of the optical lens in Embodiment 6 of the present application.

[0055] Figure 31 Structure diagram of the optical lens in Embodiment 7 of the present application.

[0056] Figure 32 Curvature of field curve of the optical lens in Embodiment 7 of the present application.

[0057] Figure 33 F-theta distortion curve of the optical lens in Embodiment 7 of the present application.

[0058] Figure 34 Relative illumination curve of the optical lens in Embodiment 7 of the present application.

[0059] Figure 35 MTF curve of the optical lens in Embodiment 7 of the present application.

[0060] Figure 36 Structure diagram of the optical lens in Embodiment 8 of the present application.

[0061] Figure 37 Curvature of field curve of the optical lens in Embodiment 8 of the present application.

[0062] Figure 38 F-theta distortion curve of the optical lens in Embodiment 8 of the present application.

[0063] Figure 39The relative illumination curve of the optical lens in Embodiment 8 of the present application.

[0064] Figure 40 The MTF curve of the optical lens in Embodiment 8 of the present application.

[0065] Figure 41 The structural schematic diagram of the optical lens in Embodiment 9 of the present application.

[0066] Figure 42 The field curvature curve of the optical lens in Embodiment 9 of the present application.

[0067] Figure 43 The F-theta distortion curve of the optical lens in Embodiment 9 of the present application.

[0068] Figure 44 The relative illumination curve of the optical lens in Embodiment 9 of the present application.

[0069] Figure 45 The MTF curve of the optical lens in Embodiment 9 of the present application.

[0070] Figure 46 The structural schematic diagram of the optical lens in Embodiment 10 of the present application.

[0071] Figure 47 The field curvature curve of the optical lens in Embodiment 10 of the present application.

[0072] Figure 48 The F-theta distortion curve of the optical lens in Embodiment 10 of the present application.

[0073] Figure 49 The relative illumination curve of the optical lens in Embodiment 10 of the present application.

[0074] Figure 50 The MTF curve of the optical lens in Embodiment 10 of the present application.

[0075] Figure 51 The structural schematic diagram of the optical lens in Embodiment 11 of the present application.

[0076] Figure 52 The field curvature curve of the optical lens in Embodiment 11 of the present application.

[0077] Figure 53 The F-theta distortion curve of the optical lens in Embodiment 11 of the present application.

[0078] Figure 54 The relative illumination curve of the optical lens in Embodiment 11 of the present application.

[0079] Figure 55 The MTF curve of the optical lens in Embodiment 11 of the present application.

[0080] Figure 56 Structure diagram of the optical lens in embodiment 12 of the present application.

[0081] Figure 57 Field curvature curve of the optical lens in embodiment 12 of the present application.

[0082] Figure 58 F-θ distortion curve of the optical lens in embodiment 12 of the present application.

[0083] Figure 59 Relative luminance curve of the optical lens in embodiment 12 of the present application.

[0084] Figure 60 MTF curve of the optical lens in embodiment 12 of the present application.

[0085] Figure 61 Structure diagram of the optical lens in embodiment 13 of the present application.

[0086] Figure 62 Field curvature curve of the optical lens in embodiment 13 of the present application.

[0087] Figure 63 F-θ distortion curve of the optical lens in embodiment 13 of the present application.

[0088] Figure 64 Relative luminance curve of the optical lens in embodiment 13 of the present application.

[0089] Figure 65 MTF curve of the optical lens in embodiment 13 of the present application.

[0090] Figure 66 Structure diagram of the optical lens in embodiment 14 of the present application.

[0091] Figure 67 Field curvature curve of the optical lens in embodiment 14 of the present application.

[0092] Figure 68 F-θ distortion curve of the optical lens in embodiment 14 of the present application.

[0093] Figure 69 Relative luminance curve of the optical lens in embodiment 14 of the present application.

[0094] Figure 70 MTF curve of the optical lens in embodiment 14 of the present application.

[0095] Figure 71 Structure diagram of the optical lens in embodiment 15 of the present application.

[0096] Figure 72 A field curvature graph for the optical lens of Example 15 of the present application.

[0097] Figure 73 An F-theta distortion curve for the optical lens of Example 15 of the present application.

[0098] Figure 74 A relative illuminance graph for the optical lens of Example 15 of the present application.

[0099] Figure 75 An MTF graph for the optical lens of Example 15 of the present application.

[0100] The following detailed description will further describe the present application with reference to the above drawings. DETAILED DESCRIPTION

[0101] 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 noted that these detailed descriptions are only descriptions of embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like drawing reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0102] It is to be noted that, in the present specification, the expressions first, second, third and the like are used only to distinguish one feature from another feature, and do not indicate any limitation of 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.

[0103] 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 or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0104] 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.

[0105] It should also be understood that the use of the terms "have", "has", "having", "include", "including", "comprise", "comprising", "contain" or "containing" throughout this specification are taken to indicate the existence of the stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when terms such as "at least one of" are used to relate a list of items, e.g., "at least one of X, Y, and Z" it is meant to indicate that X, Y, or Z can be present, but not necessarily one, two, or all of X, Y, and Z. Furthermore, when describing embodiments of the present application, the use of "can" means "one or more embodiments of the present application". Also, the use of the term "exemplary" is intended to present an example or an illustration.

[0106] 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 literal or overly formal sense unless expressly so defined herein.

[0107] 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 accompanying drawings and in conjunction with embodiments.

[0108] The optical lens provided by the embodiments of the present application comprises, in order along the optical axis from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0109] In some embodiments, the first lens can have a negative focal power, the object side surface thereof can be a concave surface or a convex surface, and the image side surface thereof is a concave surface. The second lens can have a negative focal power, the object side surface thereof can be a concave surface or a convex surface, and the image side surface thereof is a concave surface or a convex surface. The third lens can have a positive focal power, the object side surface thereof is a concave surface, and the image side surface thereof is a convex surface. The fourth lens can have a negative focal power, the object side surface thereof is a concave surface, and the image side surface thereof can be a concave surface or a convex surface. The fifth lens can have a positive focal power, the object side surface thereof can be a concave surface or a convex surface, and the image side surface thereof can be a concave surface or a convex surface. The sixth lens can have a positive focal power, the object side surface thereof can be a concave surface or a convex surface, and the image side surface thereof can be a concave surface or a convex surface. The seventh lens can have a negative focal power, the object side surface thereof can be a concave surface or a convex surface, and the image side surface thereof can be a concave surface or a convex surface.

[0110] In some embodiments, the optical lens can further include a diaphragm, which can be located between the third lens and the fourth 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 third lens and the fourth lens, the diaphragm can reasonably distribute the functions of the first lens to the seventh lens, for example, the first lens, the second lens and the third lens can be used to receive light to a greater extent, and the fifth lens to the seventh lens can be used for the function of correcting aberration, which is conducive to balancing the structure of the entire optical system. In addition, when the diaphragm is located between the third lens and the fourth lens, the diaphragm aberration correction is facilitated.

[0111] In some embodiments, the optical lens can further include a filter and a protective glass, which can be sequentially arranged between the seventh lens and the imaging surface along the optical axis. The filter is used to filter out interference light to prevent interference light from reaching the imaging surface of the optical lens and affecting normal imaging. The protective glass plays a role in protecting the optical lens, preventing the photosensitive chip from being damaged, and can improve the impact resistance and scratch resistance of the optical lens, while having little effect on the imaging quality of the optical lens.

[0112] In some embodiments, the half-aperture diameter of the surface after the diaphragm is the minimum value among the half-aperture diameters of all lenses. That is, the half-aperture diameter of the object side surface of the fourth lens is the minimum value among the half-aperture diameters of all lenses. By meeting the above requirements, the light is gradually converged and limited in the process of gradually decreasing the half-aperture diameter from the object side surface to the diaphragm surface, which helps to reduce stray light and unwanted reflections, thereby improving the clarity and contrast of the imaging; after the diaphragm surface, the half-aperture diameter gradually increases, which helps to ensure that more light can reach the imaging surface, thereby improving the brightness and signal-to-noise ratio of the image.

[0113] In some embodiments, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 0 < (R5-R6) / (R5+R6) < 0.98. By meeting the above range, the light trend is smooth, and the aberration correction pressure of the rear-end lens of the optical lens is reduced.

[0114] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 0.1 < (R1-R2) / (R1+R2) < 1.2. By meeting the above range, the deflection degree of light passing through the first lens is alleviated, and the difficulty of subsequent lens for aberration correction can be reduced.

[0115] In some embodiments, the effective focal length f of the optical lens and the total optical length TTL of the optical lens satisfy: TTL / f > 12. By meeting the above range, it is ensured that there is enough space to adjust the lens structure to optimize the imaging effect.

[0116] In some embodiments, the effective focal length f of the optical lens, the real image height IH corresponding to the maximum field of view angle, and the radian θ of the maximum half field of view angle satisfy: (IH / 2) / (f x θ) > 1.12. Satisfying the above range can achieve a larger positive F-θ distortion, which is conducive to achieving the ultra-wide-angle characteristics of the optical lens, can effectively improve the proportion of the edge field of view in the entire image surface, and further improve the angular resolution of the edge field of view.

[0117] In some embodiments, the maximum field of view angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 70° < FOV / Fno < 100°. Satisfying the above range can match different aperture sizes, so as to better balance the relationship between the field of view angle and the aperture size of the optical lens.

[0118] In some embodiments, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: IH / f > 3. Satisfying the above range can reasonably control the relationship between the image height and the focal length, which is helpful for the optical lens to achieve high-pixel characteristics.

[0119] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: BFL / f > 1.5. Satisfying the above range can help to balance the good imaging quality and the easy-to-assemble optical back focal length length, so as to ensure the imaging quality of the optical lens, avoid interference between the lens and other elements, and reduce the assembly process difficulty of the camera module.

[0120] In some embodiments, the real image height IH corresponding to the maximum field of view angle of the optical lens and the real image height IHm corresponding to the central field of view angle (which is half of the value of the maximum field of view angle) satisfy: IHm / IH < 0.5. Satisfying the above range can highlight the proportion of the edge field of view imaging range in the entire imaging range. Compared with a lens with the same field of view angle, when a chip with the same size is matched, the proportion of the edge field of view imaging range in the entire imaging range is larger, and thus more detailed information can be obtained.

[0121] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: f1 / f < -3. Satisfying the above range can make large-angle light enter the optical lens, and at the same time, a larger negative focal length is helpful for controlling perspective distortion and reducing field curvature, thereby improving the geometric accuracy of the imaging surface.

[0122] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: f2 / f < -2.5. Satisfying the above range can make the second lens have an appropriate negative optical power, can share the negative optical power of the first lens, and can make large field of view angle light enter the optical lens smoothly to expand the light collection range.

[0123] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: f3 / f>4. Satisfying the above range, the third lens has positive refractive power, which can effectively correct the aberration generated at the front end of the lens and improve the imaging quality of the lens.

[0124] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: f4 / f<-15. Satisfying the above range, the positive distortion is introduced to balance the negative distortion generated in the optical lens, thereby increasing the imaging area.

[0125] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2<f5 / f<20. Satisfying the above range, the fifth lens has appropriate positive refractive power, which helps to reduce the aberration of the optical lens.

[0126] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 2<f6 / f<12. Satisfying the above range, the sixth lens has appropriate positive refractive power, which helps to reduce the aberration of the optical lens.

[0127] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -10<f7 / f<-1. Satisfying the above range, the seventh lens has appropriate negative refractive power, which is conducive to increasing the area of the imaging surface.

[0128] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R2 of the image side surface of the first lens satisfy: R2 / f>2. Satisfying the above range, the wide-angle characteristic is achieved, so that more scene information can be obtained, and the demand for a large field of view of the optical lens is met.

[0129] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R7 of the object side surface of the fourth lens satisfy: R7 / f<-5. Satisfying the above range, the radius of curvature of the object side surface of the fourth lens is controlled within the above range, which is conducive to reducing the ghost energy of the object side light reflection of the fourth lens and reducing the difficulty of correcting the aberration of the edge field of view of the optical lens.

[0130] In some embodiments, the distance ∑CT13 of the object side surface of the first lens to the image side surface of the third lens on the optical axis and the total optical length TTL of the optical lens satisfy: 0.5<∑CT13 / TTL<0.7. Satisfying the above range, the distance of the object side surface of the first lens to the image side surface of the third lens is controlled within the above range, which is conducive to increasing the proportion of the front lens group in the entire optical lens, thereby reducing the difficulty of correcting the aberration of the rear lens group in the edge field of view.

[0131] In some embodiments, a distance ∑CT47 of the fourth lens object side to the seventh lens image side on the optical axis satisfies: 0.1<∑CT47 / TTL<0.4, where TTL is the total optical length of the optical lens. When the distance of the fourth lens object side to the seventh lens image side is controlled within the range, the total length of the optical lens is compressed, and the rear lens group has appropriate aberration correction capability.

[0132] In some embodiments, the sixth lens and the seventh lens can be cemented to form a cemented lens. The cemented lens can effectively correct chromatic aberration of the optical lens, reduce the sensitivity of the optical lens to decentration, balance aberration of the optical lens, and improve imaging quality of the optical lens. In addition, the cemented lens can 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.

[0133] In some embodiments, the optical lens satisfies the following conditions: 1mm<f<2mm, FOV>150°, 0.5mm<EPD<1mm, 25mm<TTL<31mm, 2.0<Fno<2.5, 4mm<IH<8mm, 10°<CRA<30°, where f represents an effective focal length of the optical lens, FOV represents a maximum field of view angle of the optical lens, EPD represents an entrance pupil diameter of the optical lens, TTL represents a total optical length of the optical lens, Fno represents an aperture value of the optical lens, IH represents a real image height corresponding to the maximum field of view angle of the optical lens, and CRA represents a chief ray angle of incidence at the maximum image height of the optical lens. The optical lens satisfies the above conditions, which indicates that the optical lens has at least the following characteristics: short focal length, super wide angle, and large image surface.

[0134] In some embodiments, the lens material in the optical lens can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass. The optical lens provided by the present application can adopt a full-glass lens structure, which can reduce dispersion, effectively correct chromatic aberration of the optical lens, and improve imaging quality.

[0135] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can 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 lens. More specifically, the second lens, the third lens, the fourth lens, and the fifth lens in the optical lens provided by the present application can be aspherical lenses, the first lens and the seventh lens can be spherical lenses or aspherical lenses, and the sixth lens can be a spherical lens.

[0136] In various embodiments of the present application, when the lens adopts an aspheric lens, the shape of each aspheric surface of the optical lens satisfies the following equation:

[0137]

[0138] 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, F, and G are the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, and fourteenth-order surface coefficients, respectively.

[0139] The present application is 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 found in the parameter table of each embodiment. The following embodiments are merely preferred embodiments of the present application, but the embodiments of the present 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 present application should be considered as equivalent replacement methods and are included in the protection scope of the present application.

[0140] Embodiment 1

[0141] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens provided in Embodiment 1 of the present 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 stop ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0142] The first lens L1 has a negative focal power, the object side S1 is a convex surface, and the image side S2 is a concave surface.

[0143] The second lens L2 has a negative focal power, and both the object side S3 and the image side S4 are concave surfaces.

[0144] The third lens L3 has a positive focal power, the object side S5 is a concave surface, and the image side S6 is a convex surface.

[0145] The fourth lens L4 has a negative focal power, and both the object side S7 and the image side S8 are concave surfaces.

[0146] The fifth lens L5 has a positive focal power, and both the object side S9 and the image side S10 are convex surfaces.

[0147] The sixth lens L6 has a positive focal power, and both the object side S11 and the image side S12 are convex surfaces.

[0148] The seventh lens L7 has a negative focal power, and both the object side S12 and the image side S13 are concave surfaces.

[0149] The sixth lens L6 and the seventh lens L7 form a cemented lens group, that is, the cemented surface of the image side surface of the sixth lens L6 and the object side surface of the seventh lens L7 is S12;

[0150] The object side surface S14 and the image side surface S15 of the filter G1 are both planar surfaces;

[0151] The object side surface S16 and the image side surface S17 of the protective glass G2 are both planar surfaces

[0152] The imaging surface S18 is a planar surface.

[0153] The first lens L1, the sixth lens L6 and the seventh lens L7 are glass spherical lenses, and the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are glass aspherical lenses.

[0154] The related parameters of the lenses in the optical lens in Embodiment 1 are shown in Table 1-1.

[0155] Table 1-1

[0156]

[0157]

[0158] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 1 are shown in Table 1-2.

[0159] Table 1-2

[0160] Face number K B C D E F G S3 -5.37E+01 3.32E-04 -5.94E-06 3.55E-08 3.33E-10 -2.55E-12 -1.75E-16 S4 -6.77E-01 -1.07E-03 1.30E-05 2.20E-06 7.29E-08 -2.83E-08 -1.16E-10 S5 -1.00E+02 -1.10E-03 2.54E-05 -3.53E-06 6.34E-08 1.05E-09 -1.29E-11 S6 -5.64E+00 2.14E-04 -6.51E-05 4.13E-06 -2.13E-08 -6.38E-09 2.95E-10 S7 3.62E+01 4.87E-03 -7.25E-04 1.15E-04 1.40E-04 -5.81E-05 -5.93E-06 S8 -8.70E+01 7.73E-03 8.01E-04 -9.59E-05 -1.48E-05 -1.81E-06 -2.59E-07 S9 5.72E+01 1.27E-03 7.42E-04 -9.55E-05 -2.68E-06 -5.60E-07 9.07E-08 S10 -1.03E+00 -2.24E-03 -9.21E-05 1.04E-06 -1.84E-06 6.08E-08 1.07E-08

[0161] In this embodiment, the field curvature curve, the F-theta distortion curve, the relative illumination curve and the MTF curve of the optical lens are shown in FIGS. Figure 2 、 Figure 3 、 Figure 4 、 Figure 5

[0162] Figure 2 The field curvature curve of Embodiment 1 is shown, which represents the bending degree of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.06mm-0.02mm, which shows that the optical lens can well correct the field curvature.

[0163] Figure 3 ​The F-θ distortion curve of the optical lens of the embodiment 1 is shown, which represents the F-θ distortion of light rays of different wavelengths at different image heights on the imaging plane. The horizontal axis represents the F-θ distortion (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-θ edge field distortion of the optical lens is controlled in the range of greater than +20%, which indicates that the optical lens has a large positive distortion, and improves the proportion of the edge field of view of the optical lens in the entire image plane.

[0164] Figure 4 The relative illumination curve of the optical lens of the embodiment 1 is shown, which represents the relative illumination values of different field angles on the imaging plane. The horizontal axis represents the half field of view (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 60% at the maximum half field of view, which indicates that the optical lens has a good relative illumination.

[0165] Figure 5 The MTF (modulation transfer function) curve of the optical lens of the embodiment 1 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies. The horizontal axis represents the field of view (unit: °), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the edge field of view of the embodiment is greater than 0.35 at a spatial frequency of 160 lp / mm, which indicates that the optical lens maintains a good imaging quality and a good detail resolution capability at the edge field of view.

[0166] Embodiment 2

[0167] Please refer to Figure 6 , which is a structural schematic diagram of the optical lens provided in the embodiment 2 of the present application. The optical lens of the embodiment is substantially the same as that of the embodiment 1, and the difference mainly lies in that the optical parameters such as the curvature radius, the aspheric coefficient and the thickness of each lens surface are different.

[0168] The related parameters of each lens in the optical lens of the embodiment 2 are shown in Table 2-1.

[0169] Table 2-1

[0170]

[0171]

[0172] The surface type parameters of the aspheric lens of the optical lens of the embodiment 2 are shown in Table 2-2.

[0173] Table 2-2

[0174] Face number K B C D E F G S3 -2.83E+01 3.22E-04 -5.92E-06 3.55E-08 3.58E-10 -2.45E-12 -1.77E-16 S4 -6.45E-01 -1.06E-03 1.33E-05 2.24E-06 7.22E-08 -2.83E-08 -1.15E-10 S5 -9.35E+01 -1.12E-03 2.58E-05 -3.42E-06 6.62E-08 1.04E-09 -1.26E-11 S6 -5.56E+00 2.01E-04 -6.19E-05 4.21E-06 -2.16E-08 -6.40E-09 2.93E-10 S7 -1.00E+02 5.13E-03 -7.51E-04 1.09E-04 1.37E-04 -5.75E-05 -4.01E-06 S8 9.87E+01 8.02E-03 8.74E-04 -7.62E-05 -1.11E-05 -1.71E-06 -5.19E-07 S9 5.94E+01 1.21E-03 7.79E-04 -8.41E-05 -1.66E-06 -7.52E-07 6.69E-09 S10 -1.04E+00 -2.40E-03 -1.27E-04 1.29E-06 -1.67E-06 5.14E-08 7.31E-09

[0175] In the embodiment, the field curvature curve, the F-θ distortion curve, the relative illumination curve, the MTF curve of the optical lens are respectivelyFigure 7 、 Figure 8 、 Figure 9 、 Figure 10 As can be seen from Figure 7 , the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.04mm, which indicates that the optical lens can correct the field curvature well. As can be seen from Figure 8 , the F-θ edge field distortion of the optical lens is controlled at about +14%, which indicates that the optical lens has a large positive distortion, and improves the proportion of the edge field of the optical lens in the entire image plane. As can be seen from Figure 9 , the relative luminance value of the optical lens is still greater than 70% at the maximum half field angle, which indicates that the optical lens has a good relative luminance. As can be seen from Figure 10 , the MTF value of the edge field of the embodiment is greater than 0.35 at a spatial frequency of 160lp / mm, which indicates that the optical lens maintains a good imaging quality and a good detail resolution capability at the edge field.

[0176] Embodiment 3

[0177] Please refer to Figure 11 , which is a structural schematic diagram of the optical lens provided in the embodiment 3 of the present application. The optical lens of the embodiment is substantially the same as that of the embodiment 1, and the main difference is that the optical parameters such as the curvature radius, the aspherical coefficient and the thickness of each lens surface are different.

[0178] The related parameters of each lens in the optical lens in the embodiment 3 are shown in Table 3-1.

[0179] Table 3-1

[0180]

[0181]

[0182] The surface type parameters of the aspherical lens of the optical lens in the embodiment 3 are shown in Table 3-2.

[0183] Table 3-2

[0184] Face number K B C D E F G S3 -7.35E+01 3.51E-04 -6.06E-06 3.28E-08 3.09E-10 -2.59E-12 3.83E-15 S4 -6.83E-01 -9.88E-04 1.82E-06 2.25E-06 1.16E-07 -2.58E-08 -5.27E-11 S5 1.00E+02 -1.09E-03 2.36E-05 -3.80E-06 5.75E-08 1.46E-09 2.59E-11 S6 -3.14E+00 -3.44E-05 -6.40E-05 4.61E-06 -3.96E-08 -1.07E-08 4.18E-10 S7 9.94E+01 4.40E-03 -6.91E-04 1.32E-04 1.36E-04 -6.19E-05 -8.11E-06 S8 1.00E+02 7.81E-03 9.12E-04 -7.55E-05 -1.54E-05 -2.98E-06 -8.48E-07 S9 5.74E+01 1.43E-03 7.28E-04 -9.82E-05 -2.75E-06 -5.42E-07 9.72E-08 S10 -9.72E-01 -2.48E-03 -1.48E-04 -1.75E-07 -1.74E-06 7.74E-08 1.14E-08

[0185] In the embodiment, the field curvature curve, the F-θ distortion curve, the relative luminance curve, the MTF curve of the optical lens are respectively shown in Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 . As can be seen from Figure 12 , the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.02mm, which indicates that the optical lens can correct the field curvature well. As can be seen from Figure 13As can be seen, the F-θ edge field-of-view distortion of the optical lens is controlled within a range greater than +20%, indicating that the optical lens has significant positive distortion, thereby increasing the proportion of the edge field of view in the entire image plane. From Figure 14 As can be seen, the relative illumination value of the optical lens is still greater than 68% at the maximum half-field angle, indicating that the optical lens has good relative illumination. From Figure 15 As can be seen, the MTF value of the edge field of view in this embodiment is greater than 0.3 at a spatial frequency of 160 lp / mm, indicating that the optical lens maintains good imaging quality and good detail resolution at the edge field of view.

[0186] Example 4

[0187] Please see Figure 16 The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 4 of the present invention. The optical lens in this embodiment is generally the same as that in Embodiment 1. The main difference is that the image side surface S8 of the fourth lens L4 is convex; the image side surface S12 of the sixth lens L6 is concave; the object side surface S12 of the seventh lens L7 is convex; and the optical parameters such as the radius of curvature, aspherical coefficient, and thickness of each lens surface are different.

[0188] The relevant parameters of each lens in the optical lens of Example 4 are shown in Table 4-1.

[0189] Table 4-1

[0190]

[0191] The surface profile parameters of the aspherical lens in Example 4 are shown in Table 4-2.

[0192] Table 4-2

[0193] Face number K B C D E F S3 1.00E+02 2.12E-04 -1.06E-05 7.74E-08 1.38E-09 -1.04E-11 S4 -6.16E-01 -1.44E-03 3.53E-05 5.36E-06 -1.92E-07 -1.37E-07 S5 1.00E+02 -8.50E-04 7.26E-05 -1.20E-05 -5.41E-09 -1.23E-08 S6 -2.27E+00 6.54E-04 -1.49E-04 3.22E-06 5.50E-07 -3.29E-08 S7 7.02E+00 6.16E-03 2.18E-03 -1.59E-03 6.10E-04 -2.30E-04 S8 6.26E+01 2.17E-02 1.92E-03 -4.74E-05 -2.32E-04 -6.30E-06 S9 2.77E+01 1.17E-02 1.87E-03 -6.20E-04 -5.30E-05 1.15E-05 S10 -9.10E-01 -3.08E-04 -7.31E-04 1.41E-04 -3.93E-05 5.22E-06

[0194] In this embodiment, the field curvature curve, F-θ distortion curve, relative illumination curve, and MTF curve of the optical lens are respectively as follows: Figure 17 , Figure 18 , Figure 19 , Figure 20 As shown. From Figure 17 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.08mm to 0.02mm, indicating that the optical lens can effectively correct field curvature. From Figure 18 As can be seen, the F-θ edge field-of-view distortion of the optical lens is controlled within a range greater than +20%, indicating that the optical lens has significant positive distortion, thereby increasing the proportion of the edge field of view in the entire image plane. From Figure 19It can be seen from Figure 20 It can be seen from

[0195] Example 5

[0196] Please refer to Figure 21 , which is a structural schematic diagram of the optical lens provided in Example 5 of the present application. The optical lens of the present embodiment is substantially the same as that of Example 1, and the main difference is that the first lens L1 is a glass aspherical lens, the object side S1 of the first lens L1 is a concave surface, the image side S13 of the seventh lens L7 is a convex surface, and the optical parameters such as the curvature radius, aspherical coefficient, thickness, etc. of each lens surface type are different.

[0197] The related parameters of each lens in the optical lens in Example 5 are shown in Table 5-1.

[0198] Table 5-1

[0199]

[0200]

[0201] The surface type parameters of the aspherical lens of the optical lens in Example 5 are shown in Table 5-2.

[0202] Table 5-2

[0203] Face number K B C D E F G S1 -1.00E+02 8.83E-05 -3.71E-08 -2.67E-10 2.17E-13 4.24E-15 -1.70E-17 S2 6.52E-02 -7.09E-04 7.48E-07 5.61E-08 -1.22E-10 -2.35E-11 5.03E-14 S3 2.69E+01 1.30E-04 -3.70E-06 9.89E-08 -1.75E-10 -2.99E-11 -1.52E-12 S4 -5.34E-01 1.76E-03 2.40E-05 -1.78E-06 -1.24E-07 -5.07E-08 -1.91E-11 S5 1.00E+02 -8.82E-04 3.78E-05 -3.48E-06 -1.28E-08 -4.88E-09 -3.21E-10 S6 -2.18E+00 -2.27E-04 -6.82E-05 6.03E-06 -6.09E-08 -1.92E-08 -1.09E-10 S7 9.26E+01 4.51E-03 -3.33E-04 1.26E-04 9.59E-05 -6.31E-05 7.15E-06 S8 -1.00E+02 9.26E-03 9.28E-04 1.63E-05 1.22E-05 -8.32E-07 -2.45E-06 S9 6.58E+01 2.30E-03 7.86E-04 -1.16E-04 -4.61E-06 -9.50E-07 1.21E-08 S10 -1.01E+00 -2.41E-03 -2.56E-04 2.36E-07 -1.79E-06 -5.80E-09 -1.27E-08

[0204] In the present embodiment, the field curvature curve, F-θ distortion curve, relative illumination curve, and MTF curve of the optical lens are shown in Figure 22 , Figure 23 , Figure 24 , Figure 25 From Figure 22 , it can be seen that the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.02mm~0.04mm, which indicates that the optical lens can well correct the field curvature. From Figure 23 , it can be seen that the F-θ edge field distortion of the optical lens is controlled within a range greater than +20%, which indicates that the optical lens has a large positive distortion, which improves the proportion of the edge field of the optical lens in the entire image surface. From Figure 24 , it can be seen that the relative illumination value of the optical lens at the maximum half field angle is still greater than 70%, which indicates that the optical lens has good relative illumination. From Figure 25As can be seen, the MTF value of the edge field of view in this embodiment is greater than 0.28 at a spatial frequency of 160 lp / mm, indicating that the optical lens maintains good imaging quality and good detail resolution at the edge field of view.

[0205] Example 6

[0206] Please see Figure 26 The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 6 of the present invention. The optical lens in this embodiment is roughly the same as that in Embodiment 1. The main difference is that the image side S8 of the fourth lens L4 is a convex surface; the object side S9 of the fifth lens L5 is a concave surface; and the optical parameters such as the radius of curvature, aspherical coefficient, and thickness of each lens surface are different.

[0207] The relevant parameters of each lens in the optical lens of Example 6 are shown in Table 6-1.

[0208] Table 6-1

[0209]

[0210] The surface profile parameters of the aspherical lens in Example 6 are shown in Table 6-2.

[0211] Table 6-2

[0212]

[0213]

[0214] In this embodiment, the field curvature curve, F-θ distortion curve, relative illumination curve, and MTF curve of the optical lens are respectively as follows: Figure 27 , Figure 28 , Figure 29 , Figure 30 As shown. From Figure 27 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.01mm to 0.04mm, indicating that the optical lens can effectively correct field curvature. From Figure 28 As can be seen, the F-θ edge field-of-view distortion of the optical lens is controlled within a range greater than +20%, indicating that the optical lens has significant positive distortion, thereby increasing the proportion of the edge field of view in the entire image plane. From Figure 29 As can be seen, the relative illumination value of the optical lens is still greater than 70% at the maximum half-field angle, indicating that the optical lens has good relative illumination. From Figure 30 As can be seen, the MTF value of the edge field of view in this embodiment is greater than 0.3 at a spatial frequency of 160 lp / mm, indicating that the optical lens maintains good imaging quality and good detail resolution at the edge field of view.

[0215] Embodiment 7

[0216] Referring to Figure 31 , a structural schematic diagram of an optical lens provided in Embodiment 7 of the present application is shown, the optical lens of the present embodiment is substantially the same as that of Embodiment 1, the difference mainly lies in that the sixth lens L6 and the seventh lens L7 are not cemented lenses; the object side S3 of the second lens L2 is a convex surface; the image side S8 of the fourth lens L4 is a convex surface; the image side S12 of the sixth lens L6 is a concave surface; the optical parameters such as the curvature radius, aspheric coefficient and thickness of each lens surface type are different.

[0217] The related parameters of each lens in the optical lens in Embodiment 7 are shown in Table 7-1.

[0218] Table 7-1

[0219]

[0220]

[0221] The surface type parameters of the aspheric lenses of the optical lens in Embodiment 7 are shown in Table 7-2.

[0222] Table 7-2

[0223] Face number K B C D E F S3 4.34E+01 2.09E-04 -1.07E-05 7.38E-08 1.33E-09 -9.98E-12 S4 -6.21E-01 -1.48E-03 3.51E-05 5.44E-06 -1.78E-07 -1.35E-07 S5 1.00E+02 -8.55E-04 7.19E-05 -1.21E-05 -1.10E-08 -1.17E-08 S6 -2.30E+00 6.61E-04 -1.50E-04 2.93E-06 5.09E-07 -3.08E-08 S7 1.10E+01 6.13E-03 2.16E-03 -1.59E-03 6.10E-04 -2.28E-04 S8 5.80E+01 2.19E-02 1.91E-03 -4.76E-05 -2.30E-04 -6.22E-06 S9 2.76E+01 1.17E-02 1.87E-03 -6.19E-04 -5.31E-05 1.14E-05 S10 -9.10E-01 -3.30E-04 -7.31E-04 1.40E-04 -3.95E-05 5.24E-06

[0224] In the present embodiment, the field curvature curve, F-θ distortion curve, relative illumination curve and MTF curve of the optical lens are shown in Figure 32 , Figure 33 , Figure 34 , Figure 35 respectively. It can be seen from Figure 32 that the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.06mm-0.03mm, which indicates that the optical lens can well correct the field curvature. It can be seen from Figure 33 that the F-θ edge field distortion of the optical lens is controlled within the range of greater than +20%, which indicates that the optical lens has a large positive distortion, thereby improving the proportion of the edge field of the optical lens in the entire image surface. It can be seen from Figure 34 that the relative illumination value of the optical lens is still greater than 50% at the maximum half field angle, which indicates that the optical lens has a good relative illumination. It can be seen from Figure 35 that the MTF value of the edge field of the present embodiment is greater than 0.28 at a spatial frequency of 160lp / mm, which indicates that the optical lens maintains a good imaging quality and a good detail resolution capability at the edge field.

[0225] Embodiment 8

[0226] Referring to Figure 36Figure 8 shows a structural schematic diagram of an optical lens provided in Embodiment 8 of the present application. The optical lens of this embodiment is substantially the same as that of Embodiment 1, except that the first lens L1 is a glass aspherical lens, the object side S1 of the first lens L1 is a concave surface, the object side S9 of the fifth lens L5 is a concave surface, the image side S13 of the seventh lens L7 is a convex surface, and the optical parameters such as the curvature radius, aspherical coefficient and thickness of each lens surface are different.

[0227] The related parameters of each lens in the optical lens of Embodiment 8 are shown in Table 8-1.

[0228] Table 8-1

[0229]

[0230] The surface parameters of the aspherical lens of the optical lens of Embodiment 8 are shown in Table 8-2.

[0231] Table 8-2

[0232]

[0233]

[0234] In this embodiment, the field curvature curve, F-theta distortion curve, relative illumination curve and MTF curve of the optical lens are shown in Figures Figure 37 , Figure 38 , Figure 39 , Figure 40 respectively. As can be seen from Figure 37 , the field curvature of the meridional image surface and sagittal image surface is controlled within -0.04mm-0.03mm, which indicates that the optical lens can correct the field curvature well. As can be seen from Figure 38 , the F-theta edge field distortion of the optical lens is controlled within a range greater than +20%, which indicates that the optical lens has a large positive distortion, thereby increasing the proportion of the edge field in the entire image surface. As can be seen from Figure 39 , the relative illumination value of the optical lens is still greater than 70% at the maximum half field angle, which indicates that the optical lens has a good relative illumination. As can be seen from Figure 40 , the MTF value of the edge field of this embodiment is greater than 0.2 at a spatial frequency of 160lp / mm, which indicates that the optical lens maintains a good imaging quality and a good detail resolution capability at the edge field.

[0235] Embodiment 9

[0236] Please refer to Figure 41Figure 9 shows a structural schematic diagram of an optical lens provided in Embodiment 9 of the present application. The optical lens of this embodiment is substantially the same as that of Embodiment 1, except that the first lens L1 is a glass aspherical lens; the object side S3 of the second lens L2 is a convex surface; the image side S8 of the fourth lens L4 is a convex surface; the image side S10 of the fifth lens L5 is a concave surface; the image side S13 of the seventh lens L7 is a convex surface; and the optical parameters such as the curvature radius, aspherical coefficients, thickness, etc. of the lens surface types are different.

[0237] The related parameters of the lenses in the optical lens of Embodiment 9 are shown in Table 9-1.

[0238] Table 9-1

[0239]

[0240]

[0241] The surface type parameters of the aspherical lenses in the optical lens of Embodiment 9 are shown in Table 9-2.

[0242] Table 9-2

[0243] Face number K B C D E F G S1 1.86E+00 9.95E-05 6.56E-08 -1.17E-09 -1.21E-11 9.30E-15 6.29E-16 S2 0.00E+00 -3.21E-04 1.08E-05 -8.41E-08 -2.27E-09 6.94E-11 1.51E-12 S3 3.13E+00 1.25E-04 -1.37E-05 -6.96E-08 6.84E-09 2.25E-11 -1.41E-12 S4 -7.20E-01 2.01E-03 -1.99E-04 -1.27E-05 4.47E-07 -5.25E-08 5.36E-09 S5 1.00E+02 -2.05E-03 -1.05E-04 -8.26E-06 3.75E-07 3.20E-08 3.58E-10 S6 -3.22E+00 -2.55E-04 -8.19E-05 4.45E-06 1.32E-06 -1.44E-07 3.12E-09 S7 -1.00E+02 9.76E-03 -6.76E-04 6.48E-05 1.24E-04 -3.85E-05 -4.61E-06 S8 9.90E+01 8.76E-03 6.61E-04 -1.59E-04 -2.32E-05 -4.82E-06 -3.36E-06 S9 4.44E+01 2.03E-03 8.40E-04 -1.44E-04 -2.78E-05 -8.21E-06 -1.64E-06 S10 1.00E+02 1.93E-03 3.51E-04 8.74E-06 -1.15E-05 -2.18E-06 3.66E-08

[0244] In this embodiment, the field curvature curve, F-θ distortion curve, relative illumination curve and MTF curve of the optical lens are shown in Figures Figure 42 , Figure 43 , Figure 44 , Figure 45 respectively. As can be seen from Figure Figure 42 , the field curvature of the meridional image surface and sagittal image surface is controlled within -0.06mm-0.03mm, which indicates that the optical lens can well correct the field curvature. As can be seen from Figure Figure 43 , the F-θ edge field distortion of the optical lens is controlled within a range greater than +20%, which indicates that the optical lens has a large positive distortion, thereby increasing the proportion of the edge field in the entire image surface. As can be seen from Figure Figure 44 , the relative illumination value of the optical lens is still greater than 85% at the maximum half field angle, which indicates that the optical lens has a good relative illumination. As can be seen from Figure Figure 45 , the MTF value of the edge field of this embodiment is greater than 0.2 at a spatial frequency of 160lp / mm, which indicates that the optical lens maintains a good imaging quality and a good detail resolution capability at the edge field.

[0245] Embodiment 10

[0246] Please refer to Figure 46, which is a structural schematic view of the optical lens provided in Embodiment 10 of the present application. The optical lens of the present embodiment is substantially the same as that of Embodiment 1, except that the sixth lens L6 and the seventh lens L7 are not cemented lenses, the seventh lens L7 is a glass aspheric lens, the image side surface S8 of the fourth lens L4 is a convex surface, the image side surface S12 of the sixth lens L6 is a concave surface, the image side surface S14 of the seventh lens L7 is a convex surface, and the optical parameters such as the curvature radius, aspheric coefficients and thickness of each lens surface are different.

[0247] The related parameters of each lens in the optical lens of Embodiment 10 are shown in Table 10-1.

[0248] Table 10-1

[0249]

[0250] The surface parameters of the aspheric lenses of the optical lens of Embodiment 10 are shown in Table 10-2.

[0251] Table 10-2

[0252]

[0253]

[0254] In the present embodiment, the field curvature curve, F-θ distortion curve, relative illumination curve and MTF curve of the optical lens are shown in Figure 47 , Figure 48 , Figure 49 , Figure 50 respectively. As can be seen from Figure 47 , the field curvature of the meridional image surface and sagittal image surface is controlled within ±0.03 mm, which indicates that the optical lens can well correct the field curvature. As can be seen from Figure 48 , the F-θ edge field distortion of the optical lens is controlled within a range greater than +20%, which indicates that the optical lens has a large positive distortion, thereby improving the proportion of the edge field of the optical lens in the entire image surface. As can be seen from Figure 49 , the relative illumination value of the optical lens is still greater than 70% at the maximum half field angle, which indicates that the optical lens has a good relative illumination. As can be seen from Figure 50 , the MTF value of the edge field of the present embodiment is greater than 0.2 at a spatial frequency of 160 lp / mm, which indicates that the optical lens maintains a good imaging quality and a good detail resolution capability at the edge field.

[0255] Embodiment 11

[0256] Please refer to Figure 51, which is a structural schematic view of the optical lens provided in Embodiment 11 of the present application. The optical lens of the present embodiment is substantially the same as that of Embodiment 1, except that the sixth lens L6 and the seventh lens L7 are not cemented lenses; the object side S3 of the second lens L2 is a convex surface; the image side S8 of the fourth lens L4 is a convex surface; the object side S11 of the sixth lens L6 is a concave surface; the object side S13 of the seventh lens L7 is a convex surface; and the optical parameters such as the curvature radius, asphericity coefficient and thickness of each lens surface are different.

[0257] The related parameters of each lens in the optical lens of Embodiment 11 are shown in Table 11-1.

[0258] Table 11-1

[0259]

[0260]

[0261] The surface profile parameters of the aspheric lenses of the optical lens of Embodiment 11 are shown in Table 11-2.

[0262] Table 11-2

[0263] Face number K B C D E F S3 3.00E+01 1.55E-04 -1.15E-05 6.08E-08 1.22E-09 7.93E-12 S4 -6.13E-01 -2.22E-03 2.14E-05 7.48E-07 1.66E-07 6.97E-09 S5 1.00E+02 -1.63E-03 8.60E-05 -5.16E-06 3.09E-07 -5.28E-08 S6 -2.00E+00 6.97E-04 -1.46E-04 4.74E-06 3.40E-07 -6.59E-08 S7 1.00E+02 8.99E-03 1.55E-03 -1.65E-03 7.48E-04 -1.97E-04 S8 1.64E+01 2.43E-02 1.91E-03 -6.73E-05 -1.98E-04 -1.15E-05 S9 2.80E+01 1.17E-02 1.87E-03 -6.28E-04 -6.01E-05 9.70E-06 S10 -1.12E+00 -2.16E-04 -1.07E-03 9.82E-05 -3.76E-05 7.72E-06

[0264] In the present embodiment, the field curvature curve, F-θ distortion curve, relative illumination curve, MTF curve of the optical lens are respectively shown in Figure 52 , Figure 53 , Figure 54 , Figure 55 From Figure 52 , it can be seen that the field curvature of the meridional image surface and sagittal image surface is controlled within -0.07mm-0.02mm, which indicates that the optical lens can well correct the field curvature. From Figure 53 , it can be seen that the F-θ edge field distortion of the optical lens is controlled within a range greater than +20%, which indicates that the optical lens has a large positive distortion, and improves the proportion of the edge field of the optical lens in the whole image surface. From Figure 54 , it can be seen that the relative illumination value of the optical lens is still greater than 50% at the maximum half field angle, which indicates that the optical lens has a good relative illumination. From Figure 55 , it can be seen that the MTF value of the edge field of the present embodiment is greater than 0.28 at a spatial frequency of 160lp / mm, which indicates that the optical lens maintains a good imaging quality and a good detail resolution capability at the edge field.

[0265] Embodiment 12

[0266] Please refer to Figure 56Figure 12 shows a structural schematic diagram of an optical lens provided in Embodiment 12 of the present application. The optical lens of this embodiment is substantially the same as that of Embodiment 1, except that the first lens L1 is a glass aspherical lens, the image side surface S4 of the second lens L2 is a convex surface, and the optical parameters such as the curvature radius, aspherical coefficient, thickness, etc. of each lens surface are different.

[0267] The related parameters of each lens in the optical lens of Embodiment 12 are shown in Table 12-1.

[0268] Table 12-1

[0269]

[0270] The aspherical lens surface parameters of the optical lens of Embodiment 12 are shown in Table 12-2.

[0271] Table 12-2

[0272]

[0273]

[0274] In this embodiment, the field curvature curve, F-θ distortion curve, relative illumination curve, MTF curve of the optical lens are shown in Figure 57 , Figure 58 , Figure 59 , Figure 60

[0275] As can be seen from Figure 57 , the field curvature of the meridional image surface and sagittal image surface is controlled within -0.05mm-0.02mm, which shows that the optical lens can well correct the field curvature.

[0276] As can be seen from Figure 58 , the F-θ edge field distortion of the optical lens is controlled within a range greater than +20%, which shows that the optical lens has a large positive distortion, and improves the proportion of the edge field of the optical lens in the entire image surface.

[0277] As can be seen from Figure 59 , the relative illumination value of the optical lens is still greater than 70% at the maximum half field angle, which shows that the optical lens has a good relative illumination.

[0278] As can be seen from Figure 60 , the MTF value of the edge field of this embodiment is greater than 0.3 at a spatial frequency of 160lp / mm, which shows that the optical lens maintains a good imaging quality and a good detail resolution capability at the edge field.

[0279] Embodiment 13

[0280] Please refer to​Figure 61 Figure 13 shows a structural diagram of an optical lens provided in Embodiment 13 of the present application. The optical lens of this embodiment is substantially the same as that of Embodiment 1, except that the first lens L1 is a glass aspherical lens, the image side surface S4 of the second lens L2 is a convex surface, the image side surface S8 of the fourth lens L4 is a convex surface, and the optical parameters such as the curvature radius, aspherical coefficient, thickness, etc. of each lens surface type are different.

[0281] The related parameters of each lens in the optical lens of Embodiment 13 are shown in Table 13-1.

[0282] Table 13-1

[0283]

[0284]

[0285] The surface type parameters of the aspherical lens of the optical lens of Embodiment 13 are shown in Table 13-2.

[0286] Table 13-2

[0287] Face number K B C D E F G S1 2.71E+00 1.58E-04 -4.01E-07 -8.49E-10 -3.65E-11 3.47E-13 -4.12E-16 S2 4.04E-02 -2.22E-04 -6.05E-06 4.01E-06 -1.85E-08 4.40E-09 1.39E-09 S3 -4.83E+00 1.32E-03 -2.55E-06 -1.69E-06 -1.70E-07 -7.15E-09 -3.62E-10 S4 -9.14E+01 4.05E-04 -7.49E-05 -3.74E-06 -1.90E-07 -3.72E-08 2.40E-09 S5 9.70E+01 -1.60E-03 8.54E-06 2.69E-06 7.59E-07 4.25E-08 -8.26E-09 S6 -6.82E+00 7.80E-07 -2.21E-04 -1.28E-05 6.55E-06 1.67E-06 5.36E-07 S7 9.52E+00 4.66E-03 -7.59E-04 1.56E-04 2.41E-04 -9.92E-05 -1.30E-04 S8 -2.05E+01 9.47E-03 1.36E-03 -1.05E-04 -5.11E-05 -1.84E-05 9.91E-07 S9 2.97E+01 4.30E-04 5.19E-04 -1.70E-04 -1.23E-05 -4.10E-06 1.37E-06 S10 -8.79E-01 -3.02E-03 -2.75E-04 -1.97E-05 -4.34E-06 4.87E-07 -5.58E-08

[0288] In this embodiment, the field curvature curve, F-θ distortion curve, relative illumination curve, MTF curve of the optical lens are shown in Figure 62 , Figure 63 , Figure 64 , Figure 65 respectively.

[0289] As can be seen from Figure 62 , the field curvature of the meridional image surface and sagittal image surface is controlled within -0.04 mm-0.02 mm, which shows that the optical lens can well correct the field curvature.

[0290] As can be seen from Figure 63 , the F-θ edge field distortion of the optical lens is controlled within a range greater than +20%, which shows that the optical lens has a large positive distortion, and improves the proportion of the edge field of the optical lens in the entire image surface.

[0291] As can be seen from Figure 64 , the relative illumination value of the optical lens is still greater than 70% at the maximum half field angle, which shows that the optical lens has a good relative illumination.

[0292] As can be seen from Figure 65 , the MTF value of the edge field of this embodiment is greater than 0.4 at a spatial frequency of 160 lp / mm, which shows that the optical lens maintains a good imaging quality and a good detail resolution capability at the edge field.

[0293] Embodiment 14

[0294] Please refer to Figure 66 , which is a structural schematic diagram of an optical lens provided in Embodiment 14 of the present application. The optical lens of the present embodiment is substantially the same as that of Embodiment 1, except that the first lens L1 is a glass aspherical lens, the image side surface S4 of the second lens L2 is a convex surface, the image side surface S14 of the seventh lens L7 is a convex surface, and the optical parameters such as the curvature radius, aspherical coefficient, thickness, etc. of each lens surface type are different.

[0295] The related parameters of each lens in the optical lens of Embodiment 14 are shown in Table 14-1.

[0296] Table 14-1

[0297]

[0298] The surface type parameters of the aspherical lens of the optical lens of Embodiment 14 are shown in Table 14-2.

[0299] Table 14-2

[0300]

[0301]

[0302] In the present embodiment, the field curvature curve, F-θ distortion curve, relative illumination curve, MTF curve of the optical lens are respectively shown in Figure 67 , Figure 68 , Figure 69 , Figure 70 .

[0303] As can be seen from Figure 67 , the field curvature of the meridional image surface and sagittal image surface is controlled within -0.05mm-0.02mm, which indicates that the optical lens can well correct the field curvature.

[0304] As can be seen from Figure 68 , the F-θ edge field distortion of the optical lens is controlled within a range greater than +20%, which indicates that the optical lens has a large positive distortion, and improves the proportion of the edge field of the optical lens in the entire image surface.

[0305] As can be seen from Figure 69 , the relative illumination value of the optical lens is still greater than 70% at the maximum half field angle, which indicates that the optical lens has a good relative illumination.

[0306] As can be seen from Figure 70 , the MTF value of the edge field of the present embodiment is greater than 0.3 at a spatial frequency of 160lp / mm, which indicates that the optical lens maintains a good imaging quality and a good detail resolution capability at the edge field.

[0307] Embodiment 15

[0308] Please refer to Figure 71 , which is a structural schematic diagram of an optical lens provided in Embodiment 15 of the present application. The optical lens of this embodiment is substantially the same as that of Embodiment 1, except that the first lens L1 is a glass aspherical lens, the object side S1 of the first lens L1 is a concave surface, the image side S4 of the second lens L2 is a convex surface, and the optical parameters such as the curvature radius, aspherical coefficient, thickness, etc. of each lens surface type are different.

[0309] The related parameters of each lens in the optical lens of Embodiment 15 are shown in Table 15-1.

[0310] Table 15-1

[0311]

[0312]

[0313] The surface type parameters of the aspherical lens of the optical lens of Embodiment 15 are shown in Table 15-2.

[0314] Table 15-2

[0315] Face number K B C D E F G S1 1.00E+02 2.26E-04 -4.15E-07 -1.03E-09 -3.77E-11 3.28E-13 -5.24E-16 S2 6.03E-02 -1.18E-03 -1.68E-05 6.09E-06 1.81E-07 1.02E-08 2.06E-09 S3 -3.49E+00 1.10E-03 2.14E-05 -2.28E-06 -2.71E-07 -1.98E-08 -1.04E-09 S4 -9.75E+01 4.77E-04 -9.28E-05 -3.75E-06 -2.91E-07 -3.10E-08 2.92E-09 S5 -5.52E+01 -1.71E-03 1.59E-05 1.47E-06 5.87E-07 4.78E-08 -3.23E-09 S6 -5.83E+00 -7.45E-05 -1.81E-04 1.25E-05 1.49E-05 -2.06E-06 5.82E-08 S7 8.85E+00 4.54E-03 -6.99E-04 1.11E-04 2.63E-04 -7.17E-05 -7.82E-05 S8 -9.69E+01 9.45E-03 1.33E-03 -6.93E-05 -3.12E-05 -8.45E-06 1.62E-06 S9 3.03E+01 5.56E-04 4.91E-04 -1.91E-04 -1.84E-05 -3.46E-06 2.01E-06 S10 -9.43E-01 -3.10E-03 -3.10E-04 -2.34E-05 -5.03E-06 3.15E-07 -9.36E-08

[0316] In this embodiment, the field curvature curve, F-θ distortion curve, relative illumination curve, MTF curve of the optical lens are shown in Figure 72 , Figure 73 , Figure 74 , Figure 75 respectively.

[0317] As can be seen from Figure 72 , the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.02mm~0.02mm, which shows that the optical lens can well correct the field curvature.

[0318] As can be seen from Figure 73 , the F-θ edge field distortion of the optical lens is controlled within a range greater than +20%, which shows that the optical lens has a large positive distortion, and improves the proportion of the edge field of view in the entire image surface.

[0319] As can be seen from Figure 74 , the relative illumination value of the optical lens is still greater than 70% at the maximum half field angle, which shows that the optical lens has a good relative illumination.

[0320] As can be seen from Figure 75As can be seen, the MTF value of the edge field of view of the embodiment is greater than 0.25 at a spatial frequency of 160 lp / mm, indicating that the optical lens maintains good imaging quality and good detail resolution capability at the edge field of view.

[0321] Referring to Table 16, the optical characteristics corresponding to the above-mentioned embodiments are shown, including the effective focal length f, the total track length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view, the chief ray angle CRA at the maximum image height, the maximum field of view FOV, and the numerical values corresponding to each conditional expression in the embodiments.

[0322] Table 16-1

[0323]

[0324]

[0325] Table 16-2

[0326]

[0327] In summary of the above embodiments, the optical lens provided by the present application has a large field of view and high resolution by reasonable configuration of the lens surface and reasonable matching of the optical power, has good imaging quality, improves the imaging quality at the edge of the field of view, and makes the edge field of view imaging clear.

[0328] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0329] The above-described embodiments only express several embodiments of the present application, which are described in a more specific and detailed manner, but should not be understood as limiting the scope of the patent of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of protection of the present application. Therefore, the scope of protection of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens, in total seven pieces of lenses, characterized in that, In order from the object side to the imaging plane along the optical axis, the optical lens comprises in sequence: a first lens with negative refractive power, an image-side surface of which is a concave surface; a second lens with negative refractive power; a third lens with positive refractive power, an object-side surface of which is a concave surface and an image-side surface of which is a convex surface; a fourth lens with negative refractive power, an object-side surface of which is a concave surface; a fifth lens with positive refractive power; a sixth lens with positive refractive power; a seventh lens with negative refractive power; wherein a curvature radius R5 of the object-side surface of the third lens and a curvature radius R6 of the image-side surface of the third lens satisfy: 0 < (R5-R6) / (R5+R6) < 0.98; an effective focal length f of the optical lens and a total track length TTL of the optical lens satisfy: 24.34 ≥ TTL / f > 12; a maximum field of view FOV of the optical lens and an aperture value Fno of the optical lens satisfy: 70° < FOV / Fno < 100°.

2. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and a real image height IH corresponding to the maximum field of view of the optical lens satisfy: 4.31 ≥ IH / f > 3.

3. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and a focal length f5 of the fifth lens satisfy: 2 < f5 / f < 20; the effective focal length f of the optical lens and a focal length f6 of the sixth lens satisfy: 2 < f6 / f < 12.

4. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and a back focal length BFL of the optical lens satisfy: 2.56 ≥ BFL / f > 1.

5.

5. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and a curvature radius R2 of the image-side surface of the first lens satisfy: 6.01 ≥ R2 / f > 2.

6. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and a focal length f7 of the seventh lens satisfy: -10 < f7 / f < -1.

7. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and a focal length f1 of the first lens satisfy: -15.49 ≤ f1 / f < -3.

8. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and a focal length f2 of the second lens satisfy: -10.10 ≤ f2 / f < -2.

5.

9. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and a focal length f4 of the fourth lens satisfy: -59.49 ≤ f4 / f < -15.

10. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and a curvature radius R7 of the object-side surface of the fourth lens satisfy: -32.42 ≤ R7 / f < -5.

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