Optical lens

Abstract

The application provides an optical lens, which comprises seven lenses in sequence along an optical axis from an object side to an imaging surface, and the seven lenses comprise: a first lens with negative optical power, wherein an image side of the first lens is a concave surface; a second lens with negative optical power, wherein an object side of the second lens is a convex surface, and an image side of the second lens is a concave surface; a third lens with negative optical power, wherein an object side of the third lens is a convex surface, and an image side of the third lens is a concave surface; a fourth lens with positive optical power, wherein an image side of the fourth lens is a convex surface; a fifth lens with positive optical power, wherein an image side of the fifth lens is a convex surface; a sixth lens with negative optical power, wherein an object side of the sixth lens is a concave surface, and an image side of the sixth lens is a convex surface near the optical axis; and a seventh lens with negative optical power, wherein an object side of the seventh lens is a concave surface near the optical axis, and an image side of the seventh lens is a convex surface. The optical lens provided by the application has one or more advantages of super wide angle, super large aperture, large imaging surface, high pixel, high imaging quality and the like by specific surface shape matching and reasonable optical power distribution.

Description

TECHNICAL FIELD

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

[0002] With the continuous improvement of people's requirements for driving experience, vehicle application type optical lenses are used more and more in intelligent driving, and the position of vehicle optical lenses in the automobile industry is continuously improved. In the field of vehicle driving, the conventional driving recorder lens cannot simultaneously compatible with large aperture, large wide angle, high pixel and many other advantages. 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 such as ultra-wide angle, ultra-large aperture, high pixel, etc.

[0004] The present application provides an optical lens, which has seven lenses, and comprises, in order from the object side to the imaging surface along the optical axis:

[0005] a first lens with negative focal power, the image side surface of which is a concave surface;

[0006] a second lens with negative focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface;

[0007] a third lens with negative focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface;

[0008] a fourth lens with positive focal power, the image side surface of which is a convex surface;

[0009] a fifth lens with positive focal power, the image side surface of which is a convex surface;

[0010] a sixth lens with 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;

[0011] a seventh lens with negative focal power, the object side surface of which is a concave surface near the optical axis, and the image side surface of which is a convex surface;

[0012] wherein the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view FOV of the optical lens satisfy: 55°<(f×FOV) / IH<65°.

[0013] Further preferably, the effective focal length f of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1<f / EPD<1.1.

[0014] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.6<f1 / f<-2.3.

[0015] It is further preferred that an effective focal length f of the optical lens and a focal length f4 of the fourth lens satisfy: 1.4 < f4 / f < 2.4.

[0016] It is further preferred that an effective focal length f of the optical lens and a focal length f6 of the sixth lens satisfy: -33 < f6 / f < -11.

[0017] It is further preferred that a maximum field angle FOV of the optical lens and an aperture value Fno of the optical lens satisfy: 135° < FOV / Fno < 145°.

[0018] It is further preferred that a curvature radius R3 of an object side surface of the second lens and a curvature radius R4 of an image side surface of the second lens satisfy: 1.2 < R3 / R4 < 1.4.

[0019] It is further preferred that a curvature radius R13 of an object side surface of the seventh lens and a curvature radius R14 of an image side surface of the seventh lens satisfy: 0.6 < R13 / R14 < 0.7.

[0020] It is further preferred that a real image height IH corresponding to a maximum field angle of the optical lens and an aperture value Fno of the optical lens satisfy: 8mm < IH / Fno < 9mm.

[0021] It is further preferred that a half sagittal height SAG61 of an object side surface of the sixth lens, a half sagittal height SAG62 of an image side surface of the sixth lens and a central thickness CT6 of the sixth lens satisfy: -1.9 < (SAG61-SAG62) / CT6 < -0.9.

[0022] Compared with the prior art, the optical lens provided by the present application adopts seven lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, 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 improved, so that the lens has one or more advantages of super wide angle, super large aperture, large image surface, high pixel, high imaging quality and the like. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the following drawings, in which:

[0024] Figure 1 FIG. 1 is a structure diagram of an optical lens according to an embodiment of the present application.

[0025] Figure 2 FIG. 2 is a field curvature curve diagram of the optical lens according to the embodiment of the present application.

[0026] Figure 3 FIG. 3 is an f-θ distortion curve diagram of the optical lens according to the embodiment of the present application.

[0027] Figure 4 Axial aberration curve of the optical lens in embodiment 1 of the present application.

[0028] Figure 5 Vignetting curve of the optical lens in embodiment 1 of the present application.

[0029] Figure 6 Structure diagram of the optical lens in embodiment 2 of the present application.

[0030] Figure 7 Curvature of field curve of the optical lens in embodiment 2 of the present application.

[0031] Figure 8 f-θ distortion curve of the optical lens in embodiment 2 of the present application.

[0032] Figure 9 Axial aberration curve of the optical lens in embodiment 2 of the present application.

[0033] Figure 10 Vignetting curve of the optical lens in embodiment 2 of the present application.

[0034] Figure 11 Structure diagram of the optical lens in embodiment 3 of the present application.

[0035] Figure 12 Curvature of field curve of the optical lens in embodiment 3 of the present application.

[0036] Figure 13 f-θ distortion curve of the optical lens in embodiment 3 of the present application.

[0037] Figure 14 Axial aberration curve of the optical lens in embodiment 3 of the present application.

[0038] Figure 15 Vignetting curve of the optical lens in embodiment 3 of the present application.

[0039] Figure 16 Structure diagram of the optical lens in embodiment 4 of the present application.

[0040] Figure 17 Curvature of field curve of the optical lens in embodiment 4 of the present application.

[0041] Figure 18 f-θ distortion curve of the optical lens in embodiment 4 of the present application.

[0042] Figure 19 Axial aberration curve of the optical lens in embodiment 4 of the present application.

[0043] Figure 20 Figure 4 is a graph of the lateral chromatic aberration curve of the optical lens of Example 4 of the present application.

[0044] The following detailed description will further describe the present application with reference to the above figures. DETAILED DESCRIPTION

[0045] 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 figures. It is to be noted that the detailed description is only descriptive of embodiments of the present application and is not intended to be in any way limiting of the scope of the present application. Throughout this document, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0046] It is to be noted that the expressions first, second, third and the like in this description merely serve to distinguish one feature from another feature, without implying any limitation on the features. Thus, a first lens discussed below can also be termed as a second lens or a third lens, without departing from the teachings of the present application.

[0047] In the drawings, the thickness, size, and shape of the lenses have been exaggerated slightly for the sake of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0048] In this document, 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 called the object side surface of the lens, and the surface of each lens closest to the image plane is called the image side surface of the lens.

[0049] It is also to be understood that the use of the terms "include", "includes", "including", "has", "have", "has", "including", and / or "contains", when used in this specification, indicates 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 describing the embodiments of the present application, the use of "may" indicates that "one or more embodiments of the present application". Also, the term "exemplary" is intended to refer to an example or illustration.

[0050] 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.

[0051] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0052] The optical lens provided by the embodiment of the present application comprises seven lenses, and the optical lens comprises, along an optical axis from an object side to an imaging surface, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0053] In some embodiments, the first lens can have a negative focal power, the object side of the first lens can be a concave surface or a convex surface, and the image side of the first lens is a concave surface. The second lens can have a negative focal power, the object side of the second lens is a convex surface, and the image side of the second lens is a concave surface. The third lens can have a negative focal power, the object side of the third lens is a convex surface, and the image side of the third lens is a concave surface. The fourth lens can have a positive focal power, the object side of the fourth lens can be a concave surface or a convex surface, and the image side of the fourth lens is a convex surface. The fifth lens can have a positive focal power, the object side of the fifth lens can be a concave surface or a convex surface, and the image side of the fifth lens is a convex surface. The sixth lens can have a negative focal power, the object side of the sixth lens is a concave surface, and the image side of the sixth lens is a convex surface at a near optical axis. The seventh lens can have a negative focal power, the object side of the seventh lens is a concave surface at a near optical axis, and the image side of the seventh lens is a convex surface.

[0054] In some embodiments, the optical lens can further comprise a diaphragm, and the diaphragm can be located between the second lens and the third 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 second lens and the third lens, the correction of the diaphragm aberration is facilitated.

[0055] In some embodiments, the optical lens can further comprise a filter and a protective glass, and the filter and the protective glass can be sequentially arranged between the seventh lens and the imaging surface along the optical axis. The filter is used to filter out interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting normal imaging. The protective glass plays a role of protecting the optical lens to prevent the light-sensitive chip from being damaged and affecting the imaging effect of the lens.

[0056] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens, and the real image height IH corresponding to the maximum field of view FOV of the optical lens satisfy: 55° < (f x FOV) / IH < 65°. Satisfying the above condition formula, by reasonably limiting the relationship among the focal length, the field of view angle, and the image height of the optical lens, the balance between the large field of view angle and the large target surface imaging of the optical lens is achieved, and the use requirement of the wide-angle shooting of the driving recorder is better met.

[0057] In some embodiments, the effective focal length f of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1 < f / EPD < 1.1. Satisfying the above condition, by controlling the ratio of the total effective focal length to the entrance pupil diameter, the lens has the advantage of a larger aperture, so that the light flux of the lens can be increased, and the imaging effect of the lens in a dark environment can be enhanced.

[0058] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.6 < f1 / f < -2.3. Satisfying the above condition, the first lens has an appropriate negative focal length, which is beneficial to expand the field of view angle of the optical lens.

[0059] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.4 < f4 / f < 2.4. Satisfying the above condition, the fourth lens converges the incident light rays at the front end, which is beneficial to correct the aberration and the distortion of the edge field caused by the front lens group, so that the lens has smaller distortion and can provide high-definition imaging effect.

[0060] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -33 < f6 / f < -11. Satisfying the above condition, by reasonably setting the focal length of the sixth lens, the smooth transition of light is beneficial, which is convenient for correction of astigmatism and field curvature, improves the imaging quality of the optical lens, and ensures the stability of the optical system.

[0061] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 135° < FOV / Fno < 145°. Satisfying the above condition, the lens can increase the light flux through a large aperture while realizing a large view angle, and the recording view angle is more extensive.

[0062] In some embodiments, the object side surface radius of curvature R3 of the second lens and the image side surface radius of curvature R4 of the second lens satisfy: 1.2 < R3 / R4 < 1.4. Satisfying the above range, the surface type of the second lens is reasonably set, so that the light trend is more stable.

[0063] In some embodiments, the seventh lens satisfies: 0.6 < R13 / R14 < 0.7, where R13 is a curvature radius of an object side surface of the seventh lens, and R14 is a curvature radius of an image side surface of the seventh lens. The above range can reasonably limit the surface shape of the seventh lens, and help the light rays to be accurately focused on the imaging plane, and improve the definition and uniformity of brightness of the imaging.

[0064] In some embodiments, the optical lens satisfies: 8mm < IH / Fno < 9mm, where IH is a real image height corresponding to a maximum field angle of the optical lens, and Fno is an aperture value of the optical lens. The above condition can ensure that the optical lens has a large aperture while maintaining a large image surface, and achieve a balance between a large image surface and a large aperture.

[0065] In some embodiments, the sixth lens satisfies: -1.9 < (SAG61-SAG62) / CT6 < -0.9, where SAG61 is a half-sagittal height of an object side surface of the sixth lens, SAG62 is a half-sagittal height of an image side surface of the sixth lens, and CT6 is a central thickness of the sixth lens. The above condition can control the relationship between the height difference of the sagittal heights of the image side surface and the object side surface of the sixth lens and the central thickness of the sixth lens, constrain the shape of the sixth lens, facilitate the design and processing of the structure of the sixth lens, correct aberrations of each field of view, and improve the imaging quality of the optical lens.

[0066] In some embodiments, the optical lens satisfies: 5.8 < TTL / f < 7.5, where TTL is an overall optical length of the optical lens, and f is an effective focal length of the optical lens. The above condition can effectively limit the length of the lens, and facilitate miniaturization of the optical lens.

[0067] In some embodiments, the optical lens satisfies: 2.2 < IH / f < 2.6, where IH is a real image height corresponding to a maximum field angle of the optical lens, and f is an effective focal length of the optical lens. The above condition can achieve a larger field angle and imaging range, ensure a large image surface while ensuring the depth of field of the optical lens, and thus improve the imaging quality of the optical system.

[0068] In some embodiments, the optical lens satisfies: 2.6 < TTL / IH < 3.1, where TTL is an overall optical length of the optical lens, and IH is a real image height corresponding to a maximum field angle of the optical lens. The above condition can better achieve miniaturization of the lens, and ensure that the lens has a large image surface under the condition of the same overall length, and can match a larger imaging chip to achieve high-definition imaging.

[0069] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -55 < f2 / f < -14; the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: -320 < f3 / f < -13. With the above conditions satisfied, the second lens and the third lens are both negative lenses, which can further emit light, and improve the field of view angle of the imaging system.

[0070] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.8 < f5 / f < 1. With the above conditions satisfied, the fifth lens can further focus light, adjust the angle of the chief ray, optimize the imaging quality, correct the remaining aberrations (such as distortion, chromatic aberration, etc.), and reduce the distortion of the wide-angle lens.

[0071] In some embodiments, the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.6 < BFL / f < 0.9. With the above range satisfied, a balance between good imaging quality and easy-to-assemble optical back focal length is achieved, which ensures the imaging quality of the optical lens while avoiding interference between the lens and other elements, and reduces the assembly process difficulty of the camera module.

[0072] In some embodiments, the object side surface curvature radius R1 of the first lens and the image side surface curvature radius R2 of the first lens satisfy: -56 < R1 / R2 < 11. With the above conditions satisfied, the surface of the first lens can be reasonably set, and the light collecting ability of the first lens is enhanced, so as to realize an ultra-large field of view angle.

[0073] 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: 0.65 < R11 / R12 < 0.8. With the above conditions satisfied, the curvature radius of the sixth lens is reasonably set, which can correct the aberration of the optical lens and reduce the tolerance sensitivity of the optical lens.

[0074] In some embodiments, the object side surface curvature radius R3 of the second lens and the image side surface curvature radius R4 of the second lens satisfy: 6 < (R3+R4) / (R3-R4) < 10. With the above range satisfied, the light trend can be more stable.

[0075] In some embodiments, the object side surface curvature radius R5 of the third lens and the image side surface curvature radius R6 of the third lens satisfy: 10 < (R5+R6) / (R5-R6) < 26. With the above range satisfied, coma and field curvature can be corrected, the flatness of imaging is improved, and the imaging quality of the optical lens is improved.

[0076] 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: -8.5 < (R11+R12) / (R11-R12) < -5.2. Satisfying the above range, the curvature radii of the object-side surface and the image-side surface of the sixth lens at the near optical axis are reasonably controlled, thereby facilitating the control of the shape of the sixth lens, correcting the self-generated aberration, and improving the imaging quality.

[0077] In some embodiments, the object-side surface curvature radius R13 of the seventh lens and the image-side surface curvature radius R14 of the seventh lens satisfy: -5.8 < (R13+R14) / (R13-R14) < -4.5. Satisfying the above range, the shape of the object-side surface and the image-side surface of the seventh lens are reasonably defined, the seventh lens can be controlled to have a proper surface shape, which is helpful for controlling the light ray trend in the edge field of view and improving the imaging quality in the edge field of view.

[0078] In some embodiments, the focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy: 0 < f1 / f7 < 0.2. Satisfying the above condition, 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 many light rays as possible enter the system, which is conducive to realizing large image surface imaging of the lens while increasing the light entering amount and improving the relative luminance of the system.

[0079] In some embodiments, the central thickness CT4 of the fourth lens and the central thickness CT5 of the fifth lens satisfy: 0.4 < CT4 / CT5 < 0.8. Satisfying the above condition, the ratio of the thickness of the fourth lens on the optical axis and the thickness of the fifth lens on the optical axis is reasonably configured, and the fourth lens and the fifth lens can be mutually regulated to maintain the miniaturization feature of the optical system.

[0080] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis and the total length TTL of the optical lens satisfy: 0.6 < ∑CT / TTL < 0.7. Satisfying the above condition, the total length of the optical lens can be effectively compressed, and the structure design and production process of the optical lens are facilitated.

[0081] In some embodiments, the interval CT34 of the third lens and the fourth lens on the optical axis, the interval CT45 of the fourth lens and the fifth lens on the optical axis, the interval CT56 of the fifth lens and the sixth lens on the optical axis, and the interval CT67 of the sixth lens and the seventh lens on the optical axis satisfy: 0.03 < (CT34 + CT45 + CT56 + CT67) / TTL < 0.04, where TTL is the total length of the optical lens. Satisfying the above condition ensures that the intervals between the third, fourth, fifth, sixth, and seventh lenses are not too large, thereby controlling the lens length and reducing the energy level of ghost images caused by inter-lens reflection, achieving miniaturization and weak ghost images.

[0082] In some embodiments, the half-aperture sagittal height SAG51 of the object side surface of the fifth lens and the central thickness CT5 of the fifth lens satisfy: -0.3 < SAG51 / CT5 < 0.3. Satisfying the above condition, by appropriately adjusting the ratio of the sagittal height and the thickness of the fifth lens, the lens manufacturing and forming are facilitated, the manufacturing yield is improved, and the total length of the optical lens is shortened.

[0083] In some embodiments, the half-aperture sagittal height SAG71 of the object side surface of the seventh lens, the half-aperture sagittal height SAG62 of the image side surface of the sixth lens, and the interval CT67 of the sixth lens and the seventh lens on the optical axis satisfy: 2.8 < (SAG71 - SAG62) / CT67 < 11. Satisfying the above condition, by reasonably controlling the relationship between the sagittal height of the object side surface of the seventh lens, the sagittal height of the image side surface of the sixth lens, and the air gap of the sixth lens and the seventh lens, the coma of the off-axis field of view is corrected, and the imaging quality of the optical lens off-axis field of view is improved.

[0084] In some embodiments, the half-aperture sagittal height DM11 of the object side surface of the first lens and the half-aperture sagittal height DM72 of the image side surface of the seventh lens satisfy: 1.4 < DM11 / DM72 < 1.8. Satisfying the above condition, while ensuring that a large range of light enters the system, the aperture size of the lens is effectively reduced, which is conducive to achieving the balance between the large field of view and the small aperture of the lens.

[0085] In some embodiments, the real image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 2.2 < IH / EPD < 2.7. Satisfying the above range enables the optical lens to satisfy a large image surface while also satisfying sufficient image surface brightness in the edge field of view, preventing the occurrence of dark corners, thereby improving the imaging quality.

[0086] In some embodiments, the real image height IH corresponding to the maximum field of view angle of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half field of view angle of the optical lens satisfy: 0.92 < (IH / 2) / (f x θ) < 0.98. Satisfying the above range can make the lens have a smaller distortion value, and can provide a high-definition imaging effect.

[0087] In some embodiments, the optical lens satisfies the condition: 22mm < TTL < 27mm, 3.4mm < f < 4mm, 143° < FOV < 145°, 8.5mm < IH < 9.2mm, 1 < Fno < 1.05, 6° < CRA < 14°, wherein TTL represents the total optical length of the optical lens, f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, IH represents the real image height corresponding to the maximum field of view angle of the optical lens, Fno represents the aperture value of the optical lens, and CRA represents the chief ray angle of incidence at the maximum image height of the optical lens. Satisfying the above conditions indicates that the optical lens provided by the embodiments of the present application has one or more advantages such as a large image surface, a large field of view angle, and a large aperture.

[0088] In some embodiments, the seven lenses in the optical lens can all adopt plastic lenses or adopt a glass-plastic hybrid material collocation structure. Preferably, the optical lens of the present application adopts a seven-lens glass-plastic hybrid collocation structure, which can improve the thermal stability. Specifically, the first lens and the fourth lens can adopt glass lenses, and the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens can all be plastic lenses. Adopting a glass-plastic hybrid structure can effectively reduce the cost, correct the aberration, reduce the volume, and provide an optical lens product with higher cost performance.

[0089] 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 spherical lenses or aspherical lenses. Compared with a spherical structure, an 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 lens miniaturization. More specifically, the first lens and the fourth lens in the optical lens provided by the present application can adopt spherical lenses, and the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens can adopt aspherical lenses.

[0090] In various embodiments of the present application, when the lenses adopt aspherical lenses, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0091] ;

[0092] 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 are the fourth order, sixth order, eighth order, tenth order, twelfth order curved surface coefficients respectively.

[0093] 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.

[0094] Embodiment 1

[0095] 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 S19, a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0096] The first lens L1 has a negative focal power, the object side S1 is a convex surface, and the image side S2 is a concave surface;

[0097] The second lens L2 has a negative focal power, the object side S3 is a convex surface, and the image side S4 is a concave surface;

[0098] The third lens L3 has a negative focal power, the object side S5 is a convex surface, and the image side S6 is a concave surface;

[0099] The fourth lens L4 has a positive focal power, the object side S7 is a concave surface, and the image side S8 is a convex surface;

[0100] The fifth lens L5 has a positive focal power, the object side S9 is a convex surface, and the image side S10 is a convex surface;

[0101] The sixth lens L6 has a negative focal power, the object side S11 is a concave surface, and the image side S12 is a convex surface at the near optical axis;

[0102] The seventh lens L7 has a negative focal power, the object side S13 is a concave surface at the near optical axis, and the image side S14 is a convex surface;

[0103] The object side S15 and the image side S16 of the filter G1 are both flat surfaces;

[0104] The object side S17 and the image side S18 of the protective glass G2 are both planar surfaces.

[0105] The imaging surface S19 is a planar surface.

[0106] The first lens L1 and the fourth lens L4 are glass spherical lenses; 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.

[0107] The related parameters of the lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0108] Table 1-1

[0109]

[0110] The surface type parameters of the aspherical lenses of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0111] Table 1-2

[0112]

[0113] In this embodiment, the field curvature curve, the f-θ distortion curve, the axial aberration curve and the transverse aberration curve of the optical lens 100 are shown in FIGS. Figure 2 、 Figure 3 、 Figure 4 、 Figure 5

[0114] Figure 2 The field curvature curve of the optical lens 100 in this 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 ±0.15 mm, which shows that the optical lens 100 can better correct the field curvature.

[0115] Figure 3 The f-θ distortion curve of the optical lens 100 in this 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 ±8%, which shows that the optical lens 100 can better correct the distortion.

[0116] Figure 4 ​The axial aberration curve of the optical lens 100 in the embodiment is shown, which represents the axial 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 ±0.09mm, which shows that the optical lens 100 can better correct the axial aberration.

[0117] Figure 5 The sagittal chromatic aberration curve of the optical lens 100 in the embodiment is shown, which represents the chromatic aberration of each wavelength at different image heights on the imaging surface relative to the central wavelength (0.555μm), 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. As can be seen from the figure, the sagittal chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±8μm, which shows that the optical lens 100 can better correct the chromatic aberration.

[0118] Embodiment 2

[0119] Please refer to Figure 6 , which is a structural schematic diagram of the optical lens 200 provided in the embodiment 2 of the present application. Compared with the embodiment 1, the main difference is that the object side S7 of the fourth lens L4 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0120] The related parameters of each lens in the optical lens 200 in the embodiment 2 are shown in Table 2-1.

[0121] Table 2-1

[0122]

[0123] The surface type parameters of the aspherical lens of the optical lens 200 in the embodiment 2 are shown in Table 2-2.

[0124] Table 2-2

[0125]

[0126] In the embodiment, the field curvature curve, f-θ distortion curve, axial aberration curve, and sagittal chromatic aberration curve of the optical lens 200 are shown in Figure 7 , Figure 8 , Figure 9 , Figure 10 respectively.

[0127] As can be seen from Figure 7 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.15mm, which shows that the optical lens 200 can better correct the field curvature.

[0128] As can be seen from Figure 8It can be seen from the figure that the distortion value is controlled within ±8%, which indicates that the optical lens 200 can correct the distortion well.

[0129] From Figure 9 It can be seen from the figure that the axial aberration offset is controlled within ±0.08mm, which indicates that the optical lens 200 can correct the axial aberration well.

[0130] From Figure 10 It can be seen from the figure that the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±8μm, which indicates that the optical lens 200 can correct the chromatic aberration well.

[0131] Embodiment 3

[0132] Please refer to Figure 11 , which is a structural schematic diagram of the optical lens 300 provided in the embodiment 3 of the present application. Compared with the embodiment 1, the main difference is that the object side S7 of the fourth lens L4 is a convex surface; the object side S9 of the fifth lens L5 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0133] The related parameters of each lens in the optical lens 300 in the embodiment 3 are shown in Table 3-1.

[0134] Table 3-1

[0135]

[0136] The surface type parameters of the aspherical lens of the optical lens 300 in the embodiment 3 are shown in Table 3-2.

[0137] Table 3-2

[0138]

[0139] In the embodiment, the field curvature curve, the f-θ 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 .

[0140] From Figure 12 It can be seen from the figure that the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.15mm, which indicates that the optical lens 300 can correct the field curvature well.

[0141] From Figure 13 It can be seen from the figure that the distortion value is controlled within ±10%, which indicates that the optical lens 300 can correct the distortion well.

[0142] From Figure 14It can be seen from the figure that the offset of the axial aberration is controlled within ±0.08 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0143] from Figure 15 It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±8μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0144] Example 4

[0145] See also Figure 16 , shown is a schematic structural diagram of an optical lens 400 provided in Example 4 of the present invention. Compared with Example 1, this embodiment has the following main differences: the object-side surface S1 of the first lens L1 is concave; the object-side surface S7 of the fourth lens L4 is convex; the object-side surface S9 of the fifth lens L5 is concave; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0146] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0147] Table 4-1

[0148]

[0149] The surface parameters of the aspheric lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0150] Table 4-2

[0151]

[0152] In this embodiment, the field curvature curve, f-θ distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 400 are shown as follows: Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 shown.

[0153] from Figure 17 It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 400 can correct the field curvature well.

[0154] from Figure 18 It can be seen that the distortion value is controlled within ±8%, indicating that the optical lens 400 can correct the distortion well.

[0155] from Figure 19 It can be seen that the offset of the axial aberration is controlled within ±0.08 mm, indicating that the optical lens 400 can correct the axial aberration well.

[0156] fromFigure 20 As can be seen, the perpendicular color difference of the longest wavelength and the shortest wavelength is controlled within ±8 μm, which indicates that the optical lens 400 can correct chromatic aberration well.

[0157] Referring to Table 5, the optical characteristics corresponding to the above-mentioned embodiments are shown, including the effective focal length f, the total track length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view, the chief ray angle of incidence CRA at the maximum image height, the maximum field of view FOV of the optical lens, and the numerical value corresponding to each conditional expression in the embodiments.

[0158] Table 5

[0159]

[0160] In summary, the optical lens provided by the present application adopts seven pieces of glass-plastic hybrid structure, and through specific surface shape setting and reasonable power distribution, 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 improved, so that the lens has one or more advantages of super wide angle, super large aperture, large image surface, high pixel, high imaging quality, etc.

[0161] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0162] The above-described embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but should not be understood as a limitation on the patent scope of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. An optical lens, comprising seven lenses, characterized in that: Along the optical axis from the object side to the imaging surface, it includes: a first lens having negative optical power and a concave image-side surface; a second lens having negative optical power, the object-side surface of which is convex and the image-side surface of which is concave; a third lens element having negative optical power, whose object-side surface is convex and whose image-side surface is concave; a fourth lens element having positive refractive power and a convex image-side surface; a fifth lens element having positive refractive power and a convex image-side surface; a sixth lens element having negative optical power, whose object-side surface is concave and whose image-side surface is convex near the optical axis; The seventh lens element has a negative optical power, the object side surface of which is concave near the optical axis and the image side surface of which is convex; The effective focal length f of the optical lens, the maximum field of view FOV of the optical lens, and the real image height IH corresponding to the maximum field of view of the optical lens satisfy the following conditions: 55°<(f×FOV) / IH<65°. The true image height IH corresponding to the maximum field angle of the optical lens and the aperture value Fno of the optical lens meet the following requirements: 8mm <IH / Fno<9mm。 2. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1 <f / EPD<1.1。 3. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.6 <f1 / f<-2.3。 4. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.4 <f4 / f<2.4。 5. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: <f6 / f<-11。 6. The optical lens according to claim 1, wherein: The maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens meet the following requirements: 135° <FOV / Fno<145°。 7. The optical lens according to claim 1, wherein: The object side curvature radius R3 of the second lens and the image side curvature radius R4 of the second lens satisfy: 1.2 <R3 / R4<1.4。 8. The optical lens according to claim 1, wherein: The object side curvature radius R13 of the seventh lens and the image side curvature radius R14 of the seventh lens satisfy: 0.6 <R13 / R14<0.7。 9. The optical lens according to claim 1, wherein: The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 5.8 <TTL / f<7.5。 10. The optical lens according to claim 1, wherein: The object side light semi-aperture sag height SAG61 of the sixth lens, the image side light semi-aperture sag height SAG62 of the sixth lens and the center thickness CT6 of the sixth lens satisfy: -1.9<(SAG61-SAG62) / CT6<-0.9.

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