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 positive focal power, the object side of which is a convex surface and the image side of which is a concave surface; a second lens with negative focal 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 focal power, the object side of which is a convex surface and the image side of which is a concave surface near the optical axis; a fourth lens with focal 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 fifth lens with negative focal power, the object side of which is a convex surface near the optical axis and the image side of which is a concave surface near the optical axis; a sixth lens with positive focal power, the object side of which is a convex surface near the optical axis and the image side of which is a convex surface; and a seventh lens with negative focal power, the object side of which is a concave surface. The optical lens provided by the application has one or more advantages such as long-focus characteristics, a large target surface, a large aperture, high pixels, etc.

Description

TECHNICAL FIELD

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

[0002] With the popularity of smart phones, the mobile phone industry is booming, and the public's demand for mobile phones is also increasing. The camera function of the mobile phone has become an important factor for people to choose and purchase mobile phones. Therefore, mobile phone manufacturers have put forward more new requirements for the lens group mounted on the mobile phone. At the same time, with the improvement of the performance and the reduction of the size of the image sensor, the design freedom of the corresponding lens is getting smaller and smaller, and the design difficulty is increasing day by day. Therefore, how to make the mobile phone meet the high imaging quality while ensuring that the system has high pixels, large target surface and other characteristics, and the optical system meets the miniaturization requirement is a problem to be solved at present. SUMMARY

[0003] In view of the above problems, the purpose of the present application is to provide an optical lens with one or more advantages of miniaturization, large target surface, large field of view, high pixels, etc.

[0004] The technical scheme adopted by the present application is:

[0005] An optical lens composed of seven lenses, including, along the optical axis from the object side to the imaging surface:

[0006] The first lens has positive refractive power, the object side surface is convex, and the image side surface is concave;

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

[0008] The third lens has positive refractive power, the object side surface is convex, and the image side surface is concave near the optical axis;

[0009] The fourth lens has refractive power, the object side surface is concave, and the image side surface is convex near the optical axis;

[0010] The fifth lens has negative refractive power, the object side surface is convex near the optical axis, and the image side surface is concave near the optical axis;

[0011] The sixth lens has positive refractive power, the object side surface is convex near the optical axis, and the image side surface is convex;

[0012] The seventh lens has negative refractive power, the object side surface is concave;

[0013] The optical total length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1 < TTL / f < 1.2; the optical total length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.8 < TTL / IH < 0.9.

[0014] Further preferably, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 32 < f x (43.27 / IH) < 35.

[0015] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.7 < f1 / f < 1; the object side surface curvature radius R1 of the first lens and the image side surface curvature radius R2 of the first lens satisfy: 0.1 < R1 / R2 < 0.3.

[0016] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -2 < f2 / f < -1; the object side surface curvature radius R3 of the second lens and the image side surface curvature radius R4 of the second lens satisfy: 1.5 < R3 / R4 < 3.

[0017] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1.5 < f3 / f < 2.5; the object side surface curvature radius R5 of the third lens and the image side surface curvature radius R6 of the third lens satisfy: 0.35 < R5 / R6 < 0.65.

[0018] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: |f4 / f| > 20; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: |f3 / f4| < 0.1.

[0019] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -8 < f5 / f < -2.5; the object side surface curvature radius R9 of the fifth lens and the image side surface curvature radius R10 of the fifth lens satisfy: 1 < R9 / R10 < 1.6.

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1 < f6 / f < 1.5; the object side surface curvature radius R11 of the sixth lens and the image side surface curvature radius R12 of the sixth lens satisfy: -5 < R11 / R12 < -1.

[0021] It is further preferred that the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -0.8 < f7 / f < -0.5; the effective focal length f of the optical lens and the radius of curvature R13 on the object side of the seventh lens satisfy: -0.5 < R13 / f < -0.1.

[0022] It is further preferred that the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -1 < f1 / f2 < -0.2.

[0023] It is further preferred that the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 4.5 < CT1 / CT2 < 7.

[0024] It is further preferred that the central thickness CT6 of the sixth lens and the central thickness CT7 of the seventh lens satisfy: 1.1 < CT6 / CT7 < 3.5; the distance CT67 of the sixth lens and the seventh lens on the optical axis and the central thickness CT7 of the seventh lens satisfy: 2 < CT67 / CT7 < 4.

[0025] Compared with the prior art, the optical lens provided by the application has small volume, large field of view and large image surface characteristics, can be matched with a 1-inch super large bottom COMS chip, is beneficial to improving the resolution and image detail restoration degree of the lens, has long focus characteristics, can better present large local details, makes the picture more concentrated and compact, and meets the local shooting requirement; meanwhile, the overall aberration of the optical lens can be reasonably corrected, the optical lens has high pixels, and the imaging quality of the optical lens is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and / or additional aspects and advantages of the application will become apparent and be readily understood from the following description, taken in connection with the accompanying drawings, in which:

[0027] Figure 1 FIG. 1 is a structure diagram of an optical lens according to an embodiment of the application.

[0028] Figure 2 FIG. 2 is a field curvature curve diagram of the optical lens according to the embodiment of the application.

[0029] Figure 3 FIG. 3 is an F-Tanθ distortion curve diagram of the optical lens according to the embodiment of the application.

[0030] Figure 4 FIG. 4 is an axial aberration curve diagram of the optical lens according to the embodiment of the application.

[0031] Figure 5The vertical axis chromatic aberration curve of the optical lens in the embodiment 1 of the present application.

[0032] Figure 6 The structure schematic diagram of the optical lens in the embodiment 2 of the present application.

[0033] Figure 7 The field curvature curve of the optical lens in the embodiment 2 of the present application.

[0034] Figure 8 The F-Tanθ distortion curve of the optical lens in the embodiment 2 of the present application.

[0035] Figure 9 The axial aberration curve of the optical lens in the embodiment 2 of the present application.

[0036] Figure 10 The vertical axis chromatic aberration curve of the optical lens in the embodiment 2 of the present application.

[0037] Figure 11 The structure schematic diagram of the optical lens in the embodiment 3 of the present application.

[0038] Figure 12 The field curvature curve of the optical lens in the embodiment 3 of the present application.

[0039] Figure 13 The F-Tanθ distortion curve of the optical lens in the embodiment 3 of the present application.

[0040] Figure 14 The axial aberration curve of the optical lens in the embodiment 3 of the present application.

[0041] Figure 15 The vertical axis chromatic aberration curve of the optical lens in the embodiment 3 of the present application.

[0042] Figure 16 The structure schematic diagram of the optical lens in the embodiment 4 of the present application.

[0043] Figure 17 The field curvature curve of the optical lens in the embodiment 4 of the present application.

[0044] Figure 18 The F-Tanθ distortion curve of the optical lens in the embodiment 4 of the present application.

[0045] Figure 19 The axial aberration curve of the optical lens in the embodiment 4 of the present application.

[0046] Figure 20 The vertical axis chromatic aberration curve of the optical lens in the embodiment 4 of the present application.

[0047] The following specific embodiments will further illustrate the present application in combination with the above-mentioned drawings. DETAILED DESCRIPTION

[0048] For a better understanding of the present application, various aspects of the present application will be described in greater detail below with reference to the accompanying drawings. It is to be noted that these detailed description is merely descriptive of embodiments of the present application and is not intended in any way to limit the scope of the present application. Throughout the specification, like drawing reference numerals will refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0049] It is to be noted that the expressions first, second, third, etc. are used in this specification only to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0050] 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 the aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0051] In this 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.

[0052] It is also to be understood that the use of the terms "including", "including having", "having", "containing", and / or "containing having", when used in this specification, indicate the presence of the stated features, elements and / or components but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when the expression such as "at least one of" appears after the list of the features, it modifies the entire list of features and not the individual elements of the list. Furthermore, when describing embodiments of the present application, the use of "may" indicates that one or more embodiments of the present application. Also, the expression "exemplary" is intended to mean example or illustrative.

[0053] 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.

[0054] 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 the embodiments.

[0055] The optical lens provided by the embodiment of the present application is composed of seven lenses, which are sequentially arranged along the optical axis from the object side to the imaging surface as the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens.

[0056] In some embodiments, the first lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface. The second lens can have a negative focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface. The third lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface near the optical axis. The fourth lens can have a positive focal power or a negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface near the optical axis. The fifth lens can have a negative focal power, the object side surface of which is a convex surface near the optical axis, and the image side surface of which is a concave surface near the optical axis. The sixth lens can have a positive focal power, the object side surface of which is a convex surface near the optical axis, and the image side surface of which is a convex surface. The seventh lens can have a negative focal power, the object side surface of which is a concave surface, and the image side surface of which can be a concave surface or a convex surface.

[0057] In some embodiments, the optical lens can further include a diaphragm, which can be located between the object side and the first lens. It can be understood that the diaphragm is used to limit the amount of light to change the brightness of the imaging.

[0058] In some embodiments, the optical lens can further include a filter, which can be arranged between the seventh lens and the imaging surface. The filter is used to filter out interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0059] In some embodiments, the optical total length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1 < TTL / f < 1.2. Satisfying the above condition, the length of the lens can be effectively limited, and the miniaturization of the optical lens can be achieved. The optical total length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.8 < TTL / IH < 0.9. Satisfying the above condition, the lens has a larger image surface under the condition of the same total length, can match a larger imaging chip to achieve high-definition imaging, and can better achieve the balance between the small total length and the large image surface of the lens.

[0060] In some embodiments, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 32 < f x (43.27 / IH) < 35. Satisfying the above condition, the equivalent focal length of the lens can be close to 35 mm, the human focal length imaging can be achieved, the imaging angle can be close to the human eye angle, the theme of shooting can be better highlighted, the natural and realistic feeling of the imaging picture can be improved, and a better image experience can be brought to the user.

[0061] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.7 < f1 / f < 1; the object side surface curvature radius R1 of the first lens and the image side surface curvature radius R2 of the first lens satisfy: 0.1 < R1 / R2 < 0.3. Satisfying the above condition, by setting the first lens to have a larger positive refractive power, the incident light can be converged to a larger extent, and more light can enter the system, which is beneficial to improve the light intake of the lens, achieve the large aperture performance of the lens, and enable the lens to also have high-definition imaging in a darker environment.

[0062] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -2 < f2 / f < -1; the object side surface curvature radius R3 of the second lens and the image side surface curvature radius R4 of the second lens satisfy: 1.5 < R3 / R4 < 3. Satisfying the above condition, by reasonably setting the focal length and surface shape of the second lens, the positive optical power of the front end of the optical lens can be shared, thereby avoiding excessive deflection of light caused by the excessive concentration of the optical power of the first lens, and reducing the difficulty of aberration correction.

[0063] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1.5 < f3 / f < 2.5; the object side surface curvature radius R5 of the third lens and the image side surface curvature radius R6 of the third lens satisfy: 0.35 < R5 / R6 < 0.65. Satisfying the above condition, by reasonably setting the focal length and surface shape of the third lens, the light can be effectively converged, the difficulty of edge field distortion correction can be reduced, the lens can have smaller distortion while achieving a large field angle, and the overall imaging quality can be improved.

[0064] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: |f4 / f|>20; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: |f3 / f4|<0.1. By satisfying the above conditions, the smooth transition of light is facilitated by reasonably setting the refractive power of the third lens and the fourth lens, and various aberrations of the optical lens are corrected, thereby improving the imaging quality of the optical lens.

[0065] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -8<f5 / f<-2.5; 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<1.6. By satisfying the above conditions, the degree of deflection of the incident light is reduced, and excessive aberration caused by excessive refraction change is avoided, and meanwhile, various aberrations generated by the front lens group are balanced, thereby improving the overall imaging quality.

[0066] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1<f6 / f<1.5; 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: -5<R11 / R12<-1. By satisfying the above conditions, the aberration of the edge field of view is effectively improved by setting the sixth lens to have a large positive refractive power, thereby improving the overall imaging quality of the optical lens.

[0067] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -0.8<f7 / f<-0.5; the effective focal length f of the optical lens and the radius of curvature R13 of the object side surface of the seventh lens satisfy: -0.5<R13 / f<-0.1. By satisfying the above conditions, the seventh lens can provide a large negative refractive power, which is conducive to increasing the incident angle of light entering the image plane, further increasing the imaging area of the lens, and realizing large target surface imaging of the lens.

[0068] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -1<f1 / f2<-0.2. By satisfying the above conditions, the focal length relationship of the first two lenses is reasonably set, which helps more light to enter the rear optical system, increases the field angle of the lens, and improves the overall imaging quality.

[0069] In some embodiments, the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 4.5<CT1 / CT2<7. By satisfying the above conditions, the central thickness relationship of the first and second lenses is reasonably controlled, which effectively improves the field curvature and distortion of the off-axis field of view, improves the resolving power, and reduces the difficulty of lens molding.

[0070] In some embodiments, the center thickness CT6 of the sixth lens and the center thickness CT7 of the seventh lens satisfy: 1.1 < CT6 / CT7 < 3.5; and the spacing CT67 of the sixth lens and the seventh lens on the optical axis and the center thickness CT7 of the seventh lens satisfy: 2 < CT67 / CT7 < 4. Satisfying the above conditions, the assembly deformation of the lens and the assembly difficulty can be reduced while meeting the assembly stability requirement, and meanwhile, by reasonably setting the center thicknesses of the sixth and seventh lenses and the air gap, the rear end size of the lens can be effectively controlled, and the miniaturization of the lens is realized.

[0071] In some embodiments, the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: 0.8 < R7 / R8 < 1.3. Satisfying the above conditions, by reasonably controlling the surface shape of the fourth lens, the contribution of the spherical aberration of the fourth lens can be controlled within a reasonable range, so that the lens has a higher on-axis imaging resolution capability, which is beneficial to realize high-definition imaging of the lens.

[0072] In some embodiments, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -7 < f5 / f6 < -2. Satisfying the above conditions, by reasonably setting the focal length ratio of the fifth and sixth lenses in the lens, the smooth transition of light is facilitated, and meanwhile, various aberrations of the optical lens are corrected, and the imaging quality of the optical lens is improved.

[0073] In some embodiments, the focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy: -1.5 < f1 / f7 < -1. Satisfying the above conditions, by reasonably setting the focal length relationship of the first and last lenses in the lens, the area of the light entering the imaging surface is increased while ensuring that as much light as possible enters the system, which is beneficial to realize large image surface imaging of the lens, and meanwhile, the light amount is increased, and the large aperture performance of the lens is realized.

[0074] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 2.35 < IH / EPD < 2.5. Satisfying the above conditions, the lens can have a larger entrance pupil diameter and a larger imaging surface, the width of the incident light beam is increased, the luminous flux is improved, and the large aperture and large image surface of the lens are better realized.

[0075] In some embodiments, the optical lens satisfies the condition formula: 12mm < TTL < 13mm, 10mm < f < 12mm, 13.5mm < IH < 15.5mm, Fno < 1.9, 60° < FOV < 70°; wherein, TTL represents the total optical length of the optical lens, f represents the effective focal length of the optical lens, IH represents the real image height corresponding to the maximum field angle of the optical lens, Fno represents the aperture value of the optical lens, and FOV represents the maximum field angle of the optical lens. Satisfying the above condition indicates that the optical lens provided by the embodiment has at least the characteristics of large image height, long focal length, large aperture, and miniaturization.

[0076] 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. The optical lens provided by the present application can adopt a full-plastic lens structure, which not only has excellent imaging performance, but also has a compact structure, and can better achieve the balance between miniaturization and high image quality.

[0077] 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 achieving the miniaturization of the lens. More specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can 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 achieving the miniaturization of the lens.

[0078] 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:

[0079]

[0080] 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, G, H, I, and J are the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, sixteenth-order, eighteenth-order, and twentieth-order surface coefficients, respectively.

[0081] 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.

[0082] Embodiment 1

[0083] 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 includes, along the optical axis from the object side to the imaging surface, a diaphragm ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter G1.

[0084] The first lens L1 has positive focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface.

[0085] The second lens L2 has negative focal power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.

[0086] The third lens L3 has positive focal power, the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface at the near optical axis.

[0087] The fourth lens L4 has positive focal power, the object side surface S7 is a concave surface, and the image side surface S8 is a convex surface.

[0088] The fifth lens L5 has negative focal power, the object side surface S9 is a convex surface at the near optical axis, and the image side surface S10 is a concave surface at the near optical axis.

[0089] The sixth lens L6 has positive focal power, the object side surface S11 is a convex surface at the near optical axis, and the image side surface S12 is a convex surface.

[0090] The seventh lens L7 has negative focal power, the object side surface S13 is a concave surface, and the image side surface S14 is a concave surface at the near optical axis.

[0091] The object side surface S15 and the image side surface S16 of the filter G1 are both flat surfaces.

[0092] The imaging surface S17 is a flat surface.

[0093] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens all adopt plastic aspheric lenses.

[0094] The related parameters of each lens in the optical lens 100 in embodiment 1 are shown in Table 1-1.

[0095] Table 1-1

[0096]

[0097] The surface type parameters of the aspheric lenses of the optical lens 100 in embodiment 1 are shown in Table 1-2.

[0098] Table 1-2

[0099]

[0100]

[0101] Figure 2 A field curvature curve of the optical lens 100 in the embodiment is shown, which represents the bending degree 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 field of view 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 ±0.05 mm, which shows that the optical lens 100 can better correct the field curvature.

[0102] Figure 3 An F-Tanθ distortion curve of the optical lens 100 in the embodiment is shown, which represents the distortion of different field angles on the imaging surface, the horizontal axis represents the distortion value (unit: %), and the vertical axis represents the field of view angle (unit: °). It can be seen from the figure that the distortion value is controlled within ±2.5%, which shows that the optical lens 100 can better correct the distortion.

[0103] Figure 4 An axial aberration curve of the optical lens 100 in the 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. It can be seen from the figure that the offset of the axial aberration is controlled within -0.04 mm-0.02 mm, which shows that the optical lens 100 can better correct the axial aberration.

[0104] Figure 5 A sagittal chromatic aberration curve of the optical lens 100 in the embodiment is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the sagittal chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. It can be seen from the figure that the sagittal chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, which shows that the optical lens 100 can better correct the chromatic aberration.

[0105] Embodiment 2

[0106] Please refer toFigure 6 Figure 2 shows a structural diagram of the optical lens 200 provided in Embodiment 2 of the present application. Compared with Embodiment 1, the main difference is that the image side surface S14 of the seventh lens L7 is a convex surface; and the optical parameters such as the radius of curvature of each lens surface and the thickness of the lens are different.

[0107] The related parameters of each lens in the optical lens 200 in Embodiment 2 are shown in Table 2-1.

[0108] Table 2-1

[0109]

[0110] The surface type parameters of the aspherical lens of the optical lens 200 in Embodiment 2 are shown in Table 2-2.

[0111] Table 2-2

[0112]

[0113]

[0114] In this embodiment, the field curvature curve, the F-Tanθ distortion curve, the axial aberration curve and the transverse chromatic aberration curve of the optical lens 200 are shown in Figures 2-1, 2-2, 2-3 and 2-4 respectively. Figure 7 、 Figure 8 、 Figure 9 、 Figure 10

[0115] As can be seen from Figure 2-1, the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.05 mm, which indicates that the optical lens 200 can correct the field curvature well. Figure 7 As can be seen from Figure 2-2, the distortion value is controlled within ±2.5%, which indicates that the optical lens 200 can correct the distortion well.

[0116] Figure 8 As can be seen from Figure 2-3, the shift of the axial aberration is controlled within -0.04 mm-0.03 mm, which indicates that the optical lens 200 can correct the axial aberration well.

[0117] As can be seen from Figure 2-4, the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5 μm, which indicates that the optical lens 200 can correct the chromatic aberration well. Figure 9 Embodiment 3

[0118] Figure 10 Please refer to

[0119] Embodiment 3

[0120] Please refer to Figure 11 ​​​, as shown is a structural schematic view of the optical lens 300 provided in the embodiment 3 of the present application, compared with the embodiment 1, the main difference lies in that the image side surface S14 of the seventh lens L7 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0121] The related parameters of each lens in the optical lens 300 in the embodiment 3 are shown in Table 3-1.

[0122] Table 3-1

[0123]

[0124] The surface type parameters of the aspherical lens of the optical lens 300 in the embodiment 3 are shown in Table 3-2.

[0125] Table 3-2

[0126]

[0127]

[0128] In the present embodiment, the field curvature curve, the F-Tanθ distortion curve, the axial aberration curve and the transverse chromatic aberration curve of the optical lens 300 are respectively shown in Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 .

[0129] It can be seen from Figure 12 that the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.1mm, which shows that the optical lens 300 can better correct the field curvature.

[0130] It can be seen from Figure 13 that the distortion value is controlled within ±2%, which shows that the optical lens 300 can better correct the distortion.

[0131] It can be seen from Figure 14 that the offset of the axial aberration is controlled within ±0.02mm, which shows that the optical lens 300 can better correct the axial aberration.

[0132] It can be seen from Figure 15 that the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5μm, which shows that the optical lens 300 can better correct the chromatic aberration.

[0133] Embodiment 4

[0134] Please refer to Figure 16The figure shows a schematic diagram 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 fourth lens L4 has negative optical power; the image side S14 of the seventh lens L7 is convex; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0135] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0136] Table 4-1

[0137]

[0138]

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

[0140] Table 4-2

[0141]

[0142]

[0143] In this embodiment, the field curvature curve, F-Tanθ distortion curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 400 are respectively as follows: Figure 17 , Figure 18 , Figure 19 , Figure 20 As shown.

[0144] from Figure 17 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.15mm, indicating that the optical lens 400 can effectively correct field curvature.

[0145] from Figure 18 As can be seen, the distortion value is controlled within ±2%, indicating that the optical lens 400 can correct distortion well.

[0146] from Figure 19 As can be seen, the axial aberration offset is controlled within -0.04mm to 0.03mm, indicating that the optical lens 400 can correct axial aberration well.

[0147] from Figure 20 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±1μm, indicating that the optical lens 400 can correct chromatic aberration well.

[0148] Please refer to Table 5 for the optical characteristics corresponding to the above-mentioned embodiments, 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 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 the embodiments.

[0149] Table 5

[0150]

[0151]

[0152] In summary of the above embodiments, the optical lens provided by the present application has at least the following advantages:

[0153] (1) By means of specific surface shape setting and reasonable power distribution, the imaging effect of a near 35mm human focal length can be achieved, the imaging angle is close to the human eye angle, both a broad scene and sufficient details and depth can be captured, the shooting theme can be highlighted better when taking a photo, the natural and realistic feeling of the imaging picture is improved, and the user has a better image experience.

[0154] (2) The length of the lens can be effectively limited, which is conducive to the miniaturization of the optical lens; the large field of view angle and large image surface characteristics of the lens can be achieved, the lens can be matched with a 1-inch super large COMS chip, and the resolution and image detail restoration degree of the lens are improved.

[0155] (3) The lens has long focal characteristics, can better present large local details, and make the picture more concentrated and compact, thereby meeting the local shooting requirements; meanwhile, the overall aberration of the optical lens can be reasonably corrected, the optical lens has high pixels, and the imaging quality of the optical lens is improved.

[0156] 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.

[0157] The above 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 patent scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens consisting of seven pieces of lenses, characterized in that, In order from the object side to the imaging plane along the optical axis, comprises successively: a first lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave; a second lens with negative refractive power, the object side surface of which is convex, and the image side surface of which is concave; a third lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave near the optical axis; a fourth lens with refractive power, the object side surface of which is concave, and the image side surface of which is convex near the optical axis; a fifth lens with negative refractive power, the object side surface of which is convex near the optical axis, and the image side surface of which is concave near the optical axis; a sixth lens with positive refractive power, the object side surface of which is convex near the optical axis, and the image side surface of which is convex; a seventh lens with negative refractive power, the object side surface of which is concave; wherein the total track length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1 < TTL / f < 1.2; the total track length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.8 < TTL / IH < 0.9; the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -8 < f5 / f < -2.5; the object side surface curvature radius R9 of the fifth lens and the image side surface curvature radius R10 of the fifth lens satisfy: 1 < R9 / R10 < 1.

6.

2. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 32 < f × (43.27 / IH) < 35.

3. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.7 < f1 / f < 1; the object side surface curvature radius R1 of the first lens and the image side surface curvature radius R2 of the first lens satisfy: 0.1 < R1 / R2 < 0.

3.

4. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -2 < f2 / f < -1; the object side surface curvature radius R3 of the second lens and the image side surface curvature radius R4 of the second lens satisfy: 1.5 < R3 / R4 < 3.

5. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1.5 < f3 / f < 2.5; the object side surface curvature radius R5 of the third lens and the image side surface curvature radius R6 of the third lens satisfy: 0.35 < R5 / R6 < 0.

65.

6. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: |f4 / f| > 20; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: |f3 / f4| < 0.

1.

7. The optical lens of claim 1, wherein, The real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 2.35 < IH / EPD < 2.

5.

8. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1 < f6 / f < 1.5; the object side surface curvature radius R11 of the sixth lens and the image side surface curvature radius R12 of the sixth lens satisfy: -5 < R11 / R12 < -1.

9. The optical lens of claim 1, wherein, An effective focal length f of the optical lens and a focal length f7 of the seventh lens satisfy: -0.8 < f7 / f < -0.5; the effective focal length f of the optical lens and a curvature radius R13 on an object side of the seventh lens satisfy: -0.5 < R13 / f < -0.

1.

10. The optical lens of claim 1, wherein, A central thickness CT1 of the first lens and a central thickness CT2 of the second lens satisfy: 4.5 < CT1 / CT2 < 7.

11. The optical lens of claim 1, wherein, A central thickness CT6 of the sixth lens and a central thickness CT7 of the seventh lens satisfy: 1.1 < CT6 / CT7 < 3.5; a distance CT67 on the optical axis between the sixth lens and the seventh lens and the central thickness CT7 of the seventh lens satisfy: 2 < CT67 / CT7 < 4.

Images