Optical lens

Abstract

The application provides an optical lens, which comprises, along an optical axis from an object side to an imaging surface, a first lens with negative optical power, the object side of which is a convex surface and the image side of which is a concave surface; a second lens with optical power, the object side of which is a convex surface and the image side of which is a concave surface; a third lens with positive optical power, the image side of which is a convex surface; a fourth lens with positive optical power, the object side of which is a convex surface and the image side of which is a convex surface; a fifth lens with negative optical power, the object side of which is a concave surface and the image side of which is a convex surface near the optical axis; a sixth lens with positive optical power, the object side of which is a concave surface and the image side of which is a convex surface; and a seventh lens with positive optical power. The optical lens provided by the application can improve the imaging quality of the optical lens, reduce aberration and improve the imaging quality of the optical lens.

Description

TECHNICAL FIELD

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

[0002] In recent years, with the rapid development of smart home and security monitoring fields, smart monitoring cameras have entered thousands of households and become products that help people communicate with their families, record happy life and provide convenience for people's daily life. With the increasing use of smart monitoring cameras and the increasing use of smart monitoring cameras, people have higher requirements for their performance, and they pursue high-definition imaging effects even in cold or hot extreme environments, and can also see the surrounding scene in a relatively dark environment. However, although the monitoring lenses on the market perform well in some aspects, there is still room for improvement in some specific technical indicators.

[0003] Therefore, how to make the monitoring lens meet the requirements of high imaging quality, while ensuring that the system has the characteristics of large field of view, small volume and the like is a problem to be solved at present. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide an optical lens with the advantages of excellent imaging quality.

[0005] The technical scheme adopted by the present application is:

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

[0007] The first lens has negative optical power, the object side surface is convex, and the image side surface is concave;

[0008] The second lens has optical power, the object side surface is convex, and the image side surface is concave;

[0009] The third lens has positive optical power, and the image side surface is convex;

[0010] The fourth lens has positive optical power, the object side surface is convex, and the image side surface is convex;

[0011] The fifth lens has negative optical power, the object side surface is concave, and the image side surface is convex near the optical axis;

[0012] The sixth lens has positive optical power, the object side surface is concave, and the image side surface is convex;

[0013] The seventh lens has positive optical power;

[0014] Wherein, a radius of curvature R9 of an object side surface of the fifth lens and a radius of curvature R10 of an image side surface of the fifth lens satisfy: -1 < (R9-R10) / (R9+R10) < -0.5; a radius of curvature R11 of an object side surface of the sixth lens and a radius of curvature R12 of an image side surface of the sixth lens satisfy: 0 < (R11-R12) / (R11+R12) < 0.5.

[0015] Further preferably, a maximum field of view FOV of the optical lens and an aperture value Fno of the optical lens satisfy: 85° < FOV / Fno < 95°.

[0016] Further preferably, an 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: 2.2 < IH / f < 3.3.

[0017] Further preferably, the effective focal length f of the optical lens and a focal length f5 of the fifth lens satisfy: -1.8 < f5 / f < -1.1; the effective focal length f of the optical lens and the radius of curvature R9 of the object side surface of the fifth lens satisfy: -1.1 < R9 / f < -0.5.

[0018] Further preferably, the effective focal length f of the optical lens and a focal length f6 of the sixth lens satisfy: 1.2 < f6 / f < 2.8; the effective focal length f of the optical lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: -1 < R12 / f < -0.4.

[0019] Further preferably, a combined focal length f45 of the fourth lens and the fifth lens and a combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 1.1 < f45 / f4567 < 2.3.

[0020] Further preferably, a radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: R1 / f > 130; the radius of curvature R1 of the object side surface of the first lens and a radius of curvature R2 of the image side surface of the first lens satisfy: R1 / R2 > 60.

[0021] Further preferably, a radius of curvature R10 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: -10.5 < R10 / f < -3.5; a radius of curvature R11 of the object side surface of the sixth lens and the effective focal length f of the optical lens satisfy: -1.6 < R11 / f < -0.5.

[0022] Further preferably, a radius of curvature R13 of the object side surface of the seventh lens and a radius of curvature R14 of the image side surface of the seventh lens satisfy: 0.4 < R13 / R14 < 8.

[0023] More preferably, the sagittal height Sag10 of the image-side clear aperture of the fifth lens and the clear aperture diameter d10 of the image-side clear aperture of the fifth lens satisfy: 0 < Sag10 / d10 < 0.2; the sagittal height Sag11 of the object-side clear aperture of the sixth lens and the clear aperture diameter d11 of the object-side clear aperture of the sixth lens satisfy: -0.45 < Sag11 / d11 < 0.

[0024] Compared with the prior art, the optical lens provided by the present invention adopts seven lenses with specific optical powers. Through specific surface shape combinations and reasonable optical power distributions, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be enhanced, endowing the lens with one or more advantages such as a large field angle, a small volume, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0026] Figure 1 is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0027] Figure 2 is a field curvature curve diagram of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 3 is an axial aberration curve diagram of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 4 is a lateral chromatic aberration curve diagram of the optical lens in Embodiment 1 of the present invention.

[0030] Figure 5 is a schematic structural diagram of the optical lens in Embodiment 2 of the present invention.

[0031] Figure 6 is a field curvature curve diagram of the optical lens in Embodiment 2 of the present invention.

[0032] Figure 7 is an axial aberration curve diagram of the optical lens in Embodiment 2 of the present invention.

[0033] Figure 8 is a lateral chromatic aberration curve diagram of the optical lens in Embodiment 2 of the present invention.

[0034] Figure 9 is a schematic structural diagram of the optical lens in Embodiment 3 of the present invention.

[0035] Figure 10 is a field curvature curve diagram of the optical lens in Embodiment 3 of the present invention.

[0036] Figure 11 The axial aberration curve of the optical lens in Embodiment 3 of the present application.

[0037] Figure 12 The transverse chromatic aberration curve of the optical lens in Embodiment 3 of the present application.

[0038] Figure 13 The structure diagram of the optical lens in Embodiment 4 of the present application.

[0039] Figure 14 The field curvature curve of the optical lens in Embodiment 4 of the present application.

[0040] Figure 15 The axial aberration curve of the optical lens in Embodiment 4 of the present application.

[0041] Figure 16 The transverse chromatic aberration curve of the optical lens in Embodiment 4 of the present application.

[0042] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0043] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0044] 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 represent 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.

[0045] 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.

[0046] In this context, 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 imaging surface is referred to as the image side surface of the lens.

[0047] It should also be understood that the use of the terms "have", "has", "having", "include", "includes", "including", "comprise", "comprises" and / or "comprising", when appearing in the specification, is taken as referring to the existence of the stated features, elements and / or components, but does not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. Further, the phrase "at least one of' followed by a list of two or more items, such as "at least one of a, b, and c", should be understood to mean one, two, three, four, or more than four of a, b, and c, i.e., a, b, c, ab, ac, bc, or abc. Additionally, when describing the embodiments of the present application, the use of "can" means "one or more embodiments of the present application". Also, the use of the term "example" is intended to mean an example or illustration rather than a preference or requirement.

[0048] 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 idealized or overly formal sense unless expressly so defined herein.

[0049] It should be noted that the embodiments and features of the present application can be combined with each other, if not in conflict. The present application will be described in detail with reference to the accompanying drawings and embodiments.

[0050] The optical lens provided by the embodiments of the present application is composed of seven lenses, which include, along the optical axis from the object side to the imaging surface, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens.

[0051] In some embodiments, the first lens can have a negative focal power, the object side surface of which is convex, and the image side surface of which is concave. The second lens can have a positive focal power or a negative focal power, the object side surface of which is convex, and the image side surface of which is concave. The third lens can have a positive focal power, the object side surface of which can be concave or convex, and the image side surface of which is convex. The fourth lens can have a positive focal power, the object side surface of which is convex, and the image side surface of which is convex. The fifth lens can have a negative focal power, the object side surface of which is concave, and the image side surface of which is convex at the near optical axis. The sixth lens can have a positive focal power, the object side surface of which is concave, and the image side surface of which is convex. The seventh lens can have a positive focal power, the object side surface of which can be concave or convex, and the image side surface of which can be concave or convex.

[0052] 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. When the diaphragm is located between the third lens and the fourth lens, it is convenient to correct the diaphragm aberration.

[0053] In some embodiments, the optical lens can further include a filter, which can be disposed between the seventh lens and the imaging surface. The filter is used to filter out interference light, preventing the interference light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0054] In some embodiments, the fourth lens and the fifth lens can be cemented to form a cemented lens with positive refractive power, which can effectively correct chromatic aberration of the optical lens, reduce sensitivity of the optical lens to decentration, balance aberration of the optical lens, and improve imaging quality of the optical lens; and can also reduce assembly sensitivity of the optical lens, thereby reducing the difficulty of the processing technology of the optical lens and improving the assembly yield of the optical lens.

[0055] In some embodiments, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -1 < (R9-R10) / (R9+R10) < -0.5; and the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: 0 < (R11-R12) / (R11+R12) < 0.5. Satisfying the above ranges can control the fifth lens and the sixth lens to have appropriate surface shapes, effectively improve field curvature and aberration, and improve imaging quality of the optical lens. More specifically, -0.83 < (R9-R10) / (R9+R10) < -0.72; and 0.14 < (R11-R12) / (R11+R12) < 0.27.

[0056] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 85° < FOV / Fno < 95°. Satisfying the above range can limit the optical lens to have a suitable field of view and aperture value, so that the optical lens can collect light rays at a large angle and obtain good imaging quality. More specifically, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 91.67° < FOV / Fno < 92.53°.

[0057] 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 of the optical lens satisfy: 2.2 < IH / f < 3.3. Satisfying the above range can make the optical lens have a larger image surface, so that the optical lens can better achieve high-definition imaging quality. More specifically, 2.52 < IH / f < 3.09.

[0058] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -1.8 < f5 / f < -1.1; the effective focal length f of the optical lens and the radius of curvature R9 on the object side of the fifth lens satisfy: -1 < R9 / f < -0.5. Satisfying the above ranges, the fifth lens has a negative focal length and the object side of the fifth lens is concave, which is beneficial to increasing the imaging area and the field of view of the optical lens and improving the imaging quality of the optical lens.

[0059] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1.2 < f6 / f < 2.8; the effective focal length f of the optical lens and the radius of curvature R12 on the image side of the sixth lens satisfy: -1 < R12 / f < -0.4. Satisfying the above ranges, by reasonably controlling the focal length and surface shape of the sixth lens, it is beneficial to converge light rays while correcting the field curvature and distortion of the optical lens, and improving the imaging quality of the optical lens.

[0060] In some embodiments, the combined focal length f45 of the fourth lens and the fifth lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 1.1 < f45 / f4567 < 2.3. Satisfying the above ranges, the fourth and fifth lenses form a cemented lens with a positive focal length, which can further converge incident light, reduce light energy loss, and make the divergent light converge smoothly into the rear, further stabilize the light trend and improve the relative luminance of the edge field. More specifically, 1.26 < f45 / f4567 < 2.11.

[0061] In some embodiments, the radius of curvature R1 on the object side of the first lens and the effective focal length f of the optical lens satisfy: R1 / f > 130; the radius of curvature R1 on the object side of the first lens and the radius of curvature R2 on the image side of the first lens satisfy: R1 / R2 > 60. Satisfying the above ranges is beneficial to realizing the ultra-wide-angle characteristic, so as to be able to obtain more scene information and meet the needs of wide-range detection of the optical lens. More specifically, 140.07 < R1 / f < 198.79; 70.32 < R1 / R2 < 146.02.

[0062] In some embodiments, the radius of curvature R10 on the object side of the fifth lens and the effective focal length f of the optical lens satisfy: -10.5 < R10 / f < -3.5; the radius of curvature R11 on the object side of the sixth lens and the effective focal length f of the optical lens satisfy: -1.6 < R11 / f < -0.5. Satisfying the above ranges is beneficial to reducing the deflection degree of incident light, avoiding excessive refraction changes and generating too many aberrations, and balancing various aberrations generated by the front lens group and improving the overall imaging quality. More specifically, -9.56 < R10 / f < -4.05; -1.47 < R11 / f < -0.64.

[0063] In some embodiments, the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: 0.4 < R13 / R14 < 8. By satisfying the above range, the seventh lens can have a proper surface type, which is conducive to balancing the field curvature of the optical lens and improving the imaging quality of the optical lens. More specifically, 0.46 < R13 / R14 < 7.33.

[0064] In some embodiments, the sagittal height of the half field of view light passing radius Sag10 of the image side surface of the fifth lens and the half field of view light passing radius d10 of the image side surface of the fifth lens satisfy: 0 < Sag10 / d10 < 0.2; the sagittal height of the half field of view light passing radius Sag11 of the object side surface of the sixth lens and the half field of view light passing radius d11 of the object side surface of the sixth lens satisfy: -0.45 < Sag11 / d11 < 0. By satisfying the above range, the trend of the edge field of view light can be controlled, and the central field of view detail information of the optical lens can be highlighted. More specifically, 0.02 < Sag10 / d10 < 0.08; -0.36 < Sag11 / d11 < -0.12.

[0065] In some embodiments, the total track length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4 < TTL / f < 6. By satisfying the above range, the length of the lens can be effectively limited, which is conducive to realizing the miniaturization of the optical lens. More specifically, 4.23 < TTL / f < 5.86.

[0066] In some embodiments, the total track length TTL of the optical lens and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 1.5 < TTL / IH < 2. By satisfying the above range, by reasonably limiting the ratio of the total length of the optical lens to the image height, it is ensured that the lens has a larger image surface under the same total length, realizes the balance between the miniaturization and the large image surface of the optical lens, and improves the market competitiveness. More specifically, 1.67 < TTL / IH < 1.91.

[0067] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL satisfy: 0.4 < BFL / f < 0.9. By satisfying the above range, the lens can have a proper back focus, which is conducive to the assembly of the module, reduces interference, and improves the production yield. More specifically, 0.49 < BFL / f < 0.85.

[0068] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -3.3 < f1 / f < -1.4. By setting the first lens to have a large negative refractive power, the first lens can be ensured to accommodate a larger angle of light and collect as much light as possible into the rear optical system, achieving a large field of view while increasing the light flux, and better achieving the large aperture performance of the lens. More specifically, -3.06 < f1 / f < -1.56.

[0069] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: |f2 / f| > 12. By satisfying the above range, the second lens can have an appropriate optical power, which is conducive to smooth transition of light and improves the imaging quality of the optical lens. More specifically, -15.23 < f2 / f < 57.39.

[0070] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 2 < f3 / f < 8. By setting the focal length of the third lens, the light can be effectively converged, the difficulty of correcting the edge field distortion is reduced, and the overall imaging quality is improved. More specifically, 2.48 < f3 / f < 2.7.

[0071] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.7 < f4 / f < 1.1. By satisfying the above range, the light can be effectively further converged, the aberration generated by the front end lens is corrected, and the overall imaging quality is improved. More specifically, 0.79 < f4 / f < 1.04.

[0072] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 2.2 < f7 / f < 12. By satisfying the above range, the seventh lens can have an appropriate positive optical power, which is conducive to balancing the field curvature of the optical lens and improving the imaging quality of the optical lens. More specifically, 2.49 < f7 / f < 10.99.

[0073] In some embodiments, the effective focal length f of the optical lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 1 < f4567 / f < 1.8. By setting the focal length of the diaphragm rear lens group, the spherical aberration and the field curvature generated by the front lens group of the optical lens are reduced, and the distortion and the astigmatism generated by the front lens group are better balanced by the rear lens group, and the imaging quality of the optical lens is improved. More specifically, 1.17 < f4567 / f < 1.59.

[0074] In some embodiments, the object-side surface curvature radius R9 of the fifth lens and the image-side surface curvature radius R10 of the fifth lens satisfy: 0 < R9 / R10 < 0.25. By reasonably controlling the surface shape of the fifth lens, the imaging quality of the optical lens is improved by correcting the aberration of the optical lens when the above range is satisfied. More specifically, 0.09 < R9 / R10 < 0.17.

[0075] In some embodiments, the object-side surface curvature radius R11 of the sixth lens and the image-side surface curvature radius R12 of the sixth lens satisfy: 1.2 < R11 / R12 < 1.9. By reasonably controlling the surface shape of the sixth lens, the imaging quality of the optical lens is improved by balancing the aberration of the optical lens when the above range is satisfied. More specifically, 1.34 < R11 / R12 < 1.72.

[0076] In some embodiments, the sum of the central thicknesses of the first lens to the seventh lens along the optical axis ∑CT and the total optical length of the optical lens TTL satisfy: 0.55 < ∑CT / TTL < 0.85. By effectively compressing the total length of the optical lens, the structure design and production process of the optical lens are facilitated when the above range is satisfied. More specifically, 0.64 < ∑CT / TTL < 0.75.

[0077] In some embodiments, the object-side surface half-aperture radius d1 of the first lens and the image-side surface half-aperture radius d8 of the third lens satisfy: 2.1 < d1 / d6 < 3.1; the object-side surface half-aperture radius d7 of the fourth lens and the image-side surface half-aperture radius d14 of the seventh lens satisfy: 0.25 < d7 / d14 < 0.6. By reasonably matching the aperture ratio of each lens, the imaging quality of the optical lens is improved while facilitating the structure design when the above range is satisfied. More specifically, 2.32 < d1 / d6 < 2.84; 0.32 < d7 / d14 < 0.53.

[0078] In some embodiments, the optical lens satisfies the condition formula: 2.7mm < f < 3.8mm, 160° < FOV < 175°, 1.4mm < EPD < 2.1mm, 14mm < TTL < 18mm, 1.6 < Fno < 2, 8mm < IH < 9.5mm, 13° < CRA < 15°, 1.5mm < BFL < 2.7mm, wherein 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 an optical total length of the optical lens, Fno represents an aperture value of the optical lens, IH represents an image height corresponding to the maximum field of view angle of the optical lens, CRA represents a chief ray angle of incidence at the maximum image height of the optical lens, and BFL represents a back focal length of the optical lens. Satisfying the above condition indicates that the optical lens provided by the embodiments of the present application at least has the characteristics of large field of view angle, short total length, small CRA, etc. More specifically, 2.89mm < f < 3.51mm, 167° < FOV < 169°, 1.6mm < EPD < 1.95mm, 14.85mm < TTL < 17.01mm, 1.81 < Fno < 1.84, 8.76mm < IH < 8.97mm, 13.9° < CRA < 14.1°, 1.74mm < BFL < 2.46mm.

[0079] In some embodiments, the lens material in the optical lens provided by the present application 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 itself. The first lens and the fourth lens in the optical lens provided by the present application are glass lenses, and the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are plastic lenses, which adopts a glass-plastic hybrid structure and can improve the thermal stability.

[0080] 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 adopt a spherical lens or an aspherical lens. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses and better realizing the miniaturization of the lens. More specifically, the first lens of the present application adopts a spherical lens, and the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens all adopt an aspherical lens, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and the size of the lenses and better realizing the miniaturization of the lens.

[0081] In various embodiments of the present application, when the lens adopts an aspherical lens, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0082]

[0083] Wherein, z is the distance of the curved surface and the curved surface vertex in the direction of the optical axis, h is the distance of the optical axis to the curved surface, c is the curvature of the curved surface vertex, K is the quadratic curved surface coefficient, B, C, D, E, F, G, H are the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, sixteenth order curved surface coefficients respectively.

[0084] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, 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 the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, any changes, substitutions, combinations or simplifications made without departing from the innovative points of the application should be regarded as equivalent replacement, and are included in the protection scope of the application.

[0085] Embodiment 1

[0086] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens 100 provided in the embodiment 1 of the application, the optical lens 100 includes, 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 diaphragm ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter G1.

[0087] The first lens L1 has negative focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface;

[0088] The second lens L2 has positive focal power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface;

[0089] The third lens L3 has positive focal power, the object side surface S5 is a concave surface, and the image side surface S6 is a convex surface;

[0090] The fourth lens L4 has positive focal power, the object side surface S7 is a convex surface, and the image side surface S8 is a convex surface;

[0091] The fifth lens L5 has negative focal power, the object side surface S8 is a concave surface, and the image side surface S9 is a convex surface at the near optical axis;

[0092] The fourth lens L4 and the fifth lens L5 form a cemented lens group with positive focal power, that is, the cemented surface of the image side surface of the fourth lens L4 and the object side surface of the fifth lens L5 is S8;

[0093] The sixth lens L6 has positive focal power, the object side surface S10 is a concave surface, and the image side surface S11 is a convex surface;

[0094] The seventh lens L7 has positive refractive power, the object side S12 is a concave surface, and the image side S13 is a convex surface;

[0095] The object side S14 and the image side S15 of the filter G1 are both flat surfaces;

[0096] The imaging surface S16 is a flat surface.

[0097] The first lens L1 is a glass spherical lens, the fourth lens L4 is a glass aspherical lens, and the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are plastic aspherical lenses.

[0098] The related parameters of the lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0099] Table 1-1

[0100]

[0101]

[0102] The surface type parameters of the aspherical lenses of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0103] Table 1-2

[0104]

[0105] Figure 2 The field curvature curve of the optical lens 100 in this embodiment is shown, which represents the field curvature of the light rays 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: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.15 mm, which shows that the optical lens 100 can better correct the field curvature.

[0106] Figure 3 The axial aberration curve of the optical lens 100 in this embodiment is shown, which represents the aberration of each wavelength on the optical axis at the imaging surface, the horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within ±0.04 mm, which shows that the optical lens 100 can better correct the axial aberration.

[0107] Figure 4The axial chromatic aberration curve of the optical lens 100 in the embodiment is shown in the figure, which represents the chromatic aberration of each wavelength at different image heights on the imaging surface relative to the central wavelength (0.555 μm), the horizontal axis represents the axial chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±7 μm, which shows that the optical lens 100 can better correct chromatic aberration.

[0108] Embodiment 2

[0109] Referring to Figure 5 , a structural schematic diagram of the optical lens 200 provided in the embodiment 2 of the present application is shown, and the main difference between the embodiment and the embodiment 1 is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0110] The related parameters of each lens in the optical lens 200 in the embodiment 2 are shown in Table 2-1.

[0111] Table 2-1

[0112]

[0113] The surface type parameters of the aspherical lens of the optical lens 200 in the embodiment 2 are shown in Table 2-2.

[0114] Table 2-2

[0115]

[0116] In the embodiment, the field curvature curve, the axial aberration curve and the axial chromatic aberration curve of the optical lens 200 are shown in Figure 6 , Figure 7 , Figure 8 respectively.

[0117] As can be seen from Figure 6 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.2 mm, which shows that the optical lens 200 can better correct the field curvature.

[0118] As can be seen from Figure 7 , the offset of the axial aberration is controlled within ±0.04 mm, which shows that the optical lens 200 can better correct the axial aberration.

[0119] As can be seen from Figure 8 , the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±7 μm, which shows that the optical lens 200 can better correct chromatic aberration.

[0120] Embodiment 3

[0121] Referring to Figure 9The figure shown is a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0122] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0123] Table 3-1

[0124]

[0125]

[0126] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0127] Table 3-2

[0128]

[0129] In this embodiment, the field curvature curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 300 are respectively as follows: Figure 10 , Figure 11 , Figure 12 As shown.

[0130] from Figure 10 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.15mm, indicating that the optical lens 300 can effectively correct field curvature.

[0131] from Figure 11 As can be seen, the axial aberration offset is controlled within ±0.04mm, indicating that the optical lens 300 can correct axial aberration well.

[0132] from Figure 12 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±6μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0133] Example 4

[0134] Please see Figure 13 The diagram shows a schematic of the structure of the optical lens 400 provided in Embodiment 4 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the second lens L2 has negative optical power; the object-side surface S5 of the third lens L3 is convex; the object-side surface S12 of the seventh lens L7 is convex near the optical axis; the image-side surface S13 of the seventh lens L7 is concave near the optical axis; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0135] The related parameters of the lenses in the optical lens 400 in Embodiment 4 are shown in Table 4-1.

[0136] Table 4-1

[0137]

[0138] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 4 are shown in Table 4-2.

[0139] Table 4-2

[0140]

[0141]

[0142] In this embodiment, the field curvature curve, the axial aberration curve and the transverse chromatic aberration curve of the optical lens 400 are shown in Figure 14 , Figure 15 , Figure 16 respectively.

[0143] As can be seen from Figure 14 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.15 mm, which indicates that the optical lens 400 can correct the field curvature well.

[0144] As can be seen from Figure 15 , the shift of the axial aberration is controlled within ±0.03 mm, which indicates that the optical lens 400 can correct the axial aberration well.

[0145] As can be seen from Figure 16 , the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±7 μm, which indicates that the optical lens 400 can correct the chromatic aberration well.

[0146] Please refer to Table 5, the optical properties corresponding to each of the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view angle, the chief ray angle of incidence CRA at the maximum image height, the maximum field of view angle FOV of the optical lens, and the numerical value corresponding to each conditional expression in each embodiment.

[0147] Table 5

[0148]

[0149]

[0150] In summary of the above embodiments, the optical lens provided by the present application has at least the following advantages:

[0151] (1) Through specific surface shape setting and reasonable power distribution, the lens has super wide angle, so that more scene information can be obtained, and the demand of large range shooting can be met.

[0152] (2) The optical lens can reasonably correct the overall aberration of the optical lens, realize high-definition imaging, and improve the imaging quality of the optical lens.

[0153] (3) The glass-plastic hybrid structure is adopted, the stability of the lens under high and low temperature conditions is improved, and the imaging quality is improved; meanwhile, the lens has a small CRA, can well match the chip, and ensure good resolution quality.

[0154] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "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.

[0155] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be pointed out that for ordinary 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 protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An optical lens, comprising seven lenses, characterized in that, It sequentially includes from the object side to the imaging surface along the optical axis: A first lens with negative optical power, whose object side is convex and whose image side is concave; A second lens with optical power, whose object side is convex and whose image side is concave; A third lens with positive optical power, whose image side is convex; A fourth lens with positive optical power, whose object side is convex and whose image side is convex; A fifth lens with negative optical power, whose object side is concave and whose image side is convex near the optical axis; A sixth lens with positive optical power, whose object side is concave and whose image side is convex; A seventh lens with positive optical power; Wherein, the curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: -1 < (R9 - R10) / (R9 + R10) < -0.5; the curvature radius R11 of the object side of the sixth lens and the curvature radius R12 of the image side of the sixth lens satisfy: 0 < (R11 - R12) / (R11 + R12) < 0.5; The combined focal length f45 of the fourth lens and the fifth lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 1.1 < f45 / f4567 < 2.

3.

2. The optical lens according to claim 1, characterized in that, The maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 85° < FOV / Fno < 95°.

3. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.2 < IH / f < 3.

3.

4. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -1.8 < f5 / f < -1.1; the effective focal length f of the optical lens and the curvature radius R9 of the object side of the fifth lens satisfy: -1.1 < R9 / f < -0.

5.

5. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1.2 < f6 / f < 2.8; the effective focal length f of the optical lens and the curvature radius R12 of the image side of the sixth lens satisfy: -1 < R12 / f < -0.

4.

6. The optical lens according to claim 1, characterized in that, The curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: -0.83 < (R9 - R10) / (R9 + R10) < -0.72; the curvature radius R11 of the object side of the sixth lens and the curvature radius R12 of the image side of the sixth lens satisfy: 0.14 < (R11 - R12) / (R11 + R12) < 0.27; The combined focal length f45 of the fourth lens and the fifth lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 1.26 < f45 / f4567 < 2.

11.

7. The optical lens according to claim 1, characterized in that, The curvature radius R1 of the object side of the first lens and the effective focal length f of the optical lens satisfy: 140.07 < R1 / f < 198.79; the curvature radius R1 of the object side of the first lens and the curvature radius R2 of the image side of the first lens satisfy: 70.32 < R1 / R2 < 146.

02.

8. The optical lens according to claim 1, characterized in that, The radius of curvature R10 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: -10.5 < R10 / f < -3.5; the radius of curvature R11 of the object side surface of the sixth lens and the effective focal length f of the optical lens satisfy: -1.6 < R11 / f < -0.

5.

9. The optical lens according to claim 1, characterized in that, The radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: 0.4 < R13 / R14 < 8.

10. The optical lens according to claim 1, characterized in that, The sagittal height Sag10 of the image side clear aperture of the fifth lens and the image side clear aperture diameter d10 of the fifth lens satisfy: 0 < Sag10 / d10 < 0.2; the sagittal height Sag11 of the object side clear aperture of the sixth lens and the object side clear aperture diameter d11 of the sixth lens satisfy: -0.45 < Sag11 / d11 < 0.

Images