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 the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens with positive optical power, wherein the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a plane; a third lens with positive optical power, wherein the object side surface and the image side surface of the third lens are both convex surfaces; a fourth lens with negative optical power, wherein the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a concave surface near the optical axis; a fifth lens with negative optical power, wherein the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; a sixth lens with positive optical power, wherein the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface; and a seventh lens with positive optical power, wherein the object side surface of the seventh lens is a convex surface near the optical axis, and the image side surface of the seventh lens is a concave surface near the optical axis; and the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy the condition: 5.4 < f7 / f < 10.5. The application has one or more advantages such as light and thin, large field of view, high pixel and the like.

Description

TECHNICAL FIELD

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

[0002] With the continuous upgrading of unmanned aerial vehicles, consumers have higher and higher requirements for the functions of unmanned aerial vehicles, and ultra-high pixels, large apertures and wide-angle shooting have become the main development trend of unmanned aerial vehicles. In order to pursue high-quality imaging, the mainstream unmanned aerial vehicles currently use all-glass lenses, and the number of lenses is upgraded from 5-6 to 7-8 to correct the light path. However, due to the restriction of glass lenses, the weight and volume of glass lenses are difficult to reduce, and all-glass lenses have encountered a bottleneck period. Since plastic lenses are lighter and thinner, and have good plasticity, lenses using plastic lenses can effectively be lightened and thinned, and at the same time, combining the advantages of plastic lenses, a large field of view can be realized while ensuring the amount of light entering the optical lens and the imaging clarity, which is expected to be applied in high-end unmanned aerial vehicles and is the development trend of future unmanned aerial vehicle lenses. However, how to better realize the large field of view and high pixel performance of the lens is still a problem to be solved. SUMMARY

[0003] In view of the above problems, the purpose of the present application is to provide an optical lens having one or more advantages such as lightness, thinness, large field of view and high pixel.

[0004] The present application provides an optical lens, which has a total of seven lenses, and sequentially includes, along the optical axis from the object side to the imaging surface:

[0005] a first 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;

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

[0007] a third lens with positive focal power, both the object side surface and the image side surface of which are convex surfaces;

[0008] a fourth lens with negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a concave surface near the optical axis;

[0009] a fifth 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;

[0010] a sixth lens with positive focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface;

[0011] a seventh lens with 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 concave surface near the optical axis;

[0012] wherein the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy 5.4

[0013] Further preferably, a real image height IH corresponding to a maximum field angle of view of the optical lens satisfies: 4.8 < IH / EPD < 7.2, wherein EPD is an entrance pupil diameter of the optical lens.

[0014] Further preferably, a real image height IH corresponding to a maximum field angle of view of the optical lens satisfies: 4.8 < IH / EPD < 7.2, wherein EPD is an entrance pupil diameter of the optical lens.

[0015] Further preferably, an effective focal length f of the optical lens satisfies: 0.6 < f2 / f < 1.4, wherein f2 is a focal length of the second lens.

[0016] Further preferably, an effective focal length f of the optical lens satisfies: f6 / f > 12, wherein f6 is a focal length of the sixth lens; and the effective focal length f of the optical lens satisfies: -4.4 < R11 / f < -2.9, wherein R11 is a radius of curvature of an object side surface of the sixth lens.

[0017] Further preferably, an effective focal length f of the optical lens satisfies: 1.6 < f34567 / f < 2.9, wherein f34567 is a combined focal length of the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens.

[0018] Further preferably, an effective focal length f of the optical lens satisfies: -2 < R7 / f < -1.2, wherein R7 is a radius of curvature of an object side surface of the fourth lens; and the radius of curvature of the object side surface R7 of the fourth lens satisfies: -0.8 < R7 / R8 < -0.4, wherein R8 is a radius of curvature of an image side surface of the fourth lens.

[0019] Further preferably, an effective focal length f of the optical lens satisfies: 1.1 < R14 / f < 1.7, wherein R14 is a radius of curvature of an image side surface of the seventh lens; and a radius of curvature of an object side surface R13 of the seventh lens satisfies: 0.5 < R13 / R14 < 1.1, wherein R13 is a radius of curvature of an object side surface of the seventh lens.

[0020] Further preferably, a sagittal height Sag7 of an object side light passing half aperture of the fourth lens satisfies: -0.35 < Sag7 / d7 < -0.2, wherein d7 is a diameter of the object side light passing half aperture of the fourth lens; and a sagittal height Sag14 of an image side light passing half aperture of the seventh lens satisfies: -0.35 < Sag14 / d14 < -0.1, wherein d14 is a diameter of the image side light passing half aperture of the seventh lens.

[0021] It is further preferred that the object-side surface curvature radius R11 of the sixth lens and the image-side surface curvature radius R12 of the sixth lens satisfy: 5.2 < (R11+R12) / (R11-R12) < 26.1; and the object-side surface sagittal radius of the sixth lens and the object-side surface sagittal radius of the sixth lens satisfy: -0.2 < Sag11 / d11 < 0.

[0022] Compared with the prior art, the optical lens provided by the application has a compact structure, a large field of view, and high imaging quality, can realize high-definition imaging, can reasonably correct the overall aberration of the optical lens, has high pixels, effectively shortens the overall length of the optical lens, and better meets the use requirements of unmanned aerial vehicles, such as thinness, high image quality, and wide-angle shooting. BRIEF DESCRIPTION OF DRAWINGS

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

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

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

[0026] Figure 3 FIG. 3 is an axial aberration curve of the optical lens according to the embodiment of the present application.

[0027] Figure 4 FIG. 4 is a transverse chromatic aberration curve of the optical lens according to the embodiment of the present application.

[0028] Figure 5 FIG. 5 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0029] Figure 6 FIG. 6 is a field curvature curve of the optical lens according to the embodiment of the present application.

[0030] Figure 7 FIG. 7 is an axial aberration curve of the optical lens according to the embodiment of the present application.

[0031] Figure 8 FIG. 8 is a transverse chromatic aberration curve of the optical lens according to the embodiment of the present application.

[0032] Figure 9 FIG. 9 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0033] Figure 10A field curvature graph for the optical lens of Example 3 of the present application.

[0034] Figure 11 An axial aberration graph for the optical lens of Example 3 of the present application.

[0035] Figure 12 A transverse chromatic aberration graph for the optical lens of Example 3 of the present application.

[0036] The following detailed description will further describe the present application with reference to the above drawings. DETAILED DESCRIPTION

[0037] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be noted that these detailed descriptions are only descriptions of embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like drawing reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0038] It is to be noted that, in the present specification, the expressions first, second, third and the like are used only to distinguish one feature from another feature, and do not indicate any limitation 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.

[0039] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0040] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0041] It should also be understood that the words "comprise," "comprising," "include," "including," and / or "has," "having," when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. Furthermore, when describing the embodiments of the present application, the use of "or" means "and / or" unless strictly stated otherwise. Moreover, the use of "a" or "an" means "one or more" unless strictly stated otherwise. Additionally, the use of "an exemplary embodiment" or "one exemplary embodiment" means that a particular feature, structure, or result can be included in a non-limiting embodiment. Furthermore, the terms "first," "second," "third," etc. are used merely as labels, and are not intended to impose numerical requirements on their objects.

[0042] 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.

[0043] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other if there is no conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0044] The optical lens provided by the embodiment of the present application comprises seven lenses, and the optical lens comprises, along the optical axis from the object side to the imaging surface, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0045] In some embodiments, the first lens can have a negative focal power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave. The second lens can have a positive focal power, the object side surface of the second lens is convex, and the image side surface of the second lens is flat. The third lens can have a positive focal power, the object side surface and the image side surface of the third lens are both convex. The fourth lens can have a negative focal power, the object side surface of the fourth lens is concave, and the image side surface of the fourth lens is concave near the optical axis. The fifth lens can have a negative focal power, the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex. The sixth lens can have a positive focal power, the object side surface of the sixth lens is concave, and the image side surface of the sixth lens is convex. The seventh lens can have a positive focal power, the object side surface of the seventh lens is convex near the optical axis, and the image side surface of the seventh lens is concave near the optical axis.

[0046] In some embodiments, the optical lens can further include a diaphragm, which 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. In addition, when the diaphragm is located between the second lens and the third lens, the diaphragm can reasonably distribute the functions of the first lens to the seventh lens, for example, the first lens and the second lens can be used to receive light to a greater extent, and the third lens to the seventh lens can be used for the function of correcting aberration, which is conducive to balancing the structure of the entire optical system. In addition, when the diaphragm is located between the second lens and the third lens, the correction of the diaphragm aberration is facilitated.

[0047] In some embodiments, the optical lens can further include a filter, which is 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.

[0048] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 5.4 < f7 / f < 10.5. Satisfying the above range can make the seventh lens have a suitable positive refractive power, which is conducive to adjusting the light focusing position and improving the convergence ability of the system to light, and better realizing the miniaturization of the lens. More specifically, 5.9 < f7 / f < 9.5.

[0049] 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: 4.8 < IH / EPD < 7.2. Satisfying the above range can increase the width of the light beam entering the optical lens, so that the brightness of the optical lens at the image surface is improved to avoid dark corners. More specifically: 5.2 < IH / EPD < 6.7.

[0050] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the maximum half field angle of the optical lens satisfy: 3.4 mm < (IH / 2) / θ < 5.5 mm. Satisfying the above range is conducive to increasing the image surface of the lens to realize high-definition imaging of the lens. More specifically, 3.4 mm < (IH / 2) / θ < 5.1 mm.

[0051] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0.6 < f2 / f < 1.4. Satisfying the above range limits the second lens to have a suitable positive refractive power, which is conducive to the convergence of light, so that the light entering the front of the system smoothly enters the rear optical system, and the light trend is more gentle. More specifically, 0.8 < f2 / f < 1.2.

[0052] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: f6 / f>12; the effective focal length f of the optical lens and the radius of curvature R11 on the object side of the sixth lens satisfy: -4.4

[0053] In some embodiments, the effective focal length f of the optical lens and the combined focal length f34567 of the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 1.6

[0054] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R7 on the object side of the fourth lens satisfy: -2

[0055] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R14 on the image side of the seventh lens satisfy: 1.1

[0056] In some embodiments, the sagittal height of the half field of the object side of the fourth lens Sagsatisfies -0.35 < Sags / d7 < -0.2, and the sagittal height of the half field of the image side of the seventh lens Sag14satisfies -0.35 < Sag14 / d14 < -0.1. Satisfying the above range can effectively improve various aberrations of the edge field of view of the optical lens, and improve the imaging quality of the edge field of view of the optical lens. More specifically, -0.3 < Sags / d7 < -0.26, and -0.29 < Sag14 / d14 < -0.13.

[0057] In some embodiments, the radius of curvature of the object side of the sixth lens R11satisfies 5.2 < (R11+R12) / (R11-R12) < 26.1, and the sagittal height of the half field of the object side of the sixth lens Sag11satisfies -0.2 < Sag11 / d11 < 0. Satisfying the above range can help reduce the aberration of the optical lens, effectively improve various aberrations of the edge field of view of the optical lens, and improve the imaging quality of the edge field of view of the optical lens. More specifically, 5.8 < (R11+R12) / (R11-R12) < 24, and -0.12 < Sag11 / d11 < -0.01.

[0058] In some embodiments, the effective focal length f of the optical lens and the total track length TTL satisfy 1.8 < TTL / f < 2.5. Satisfying the above range is conducive to realizing the miniaturization of the lens. More specifically, 2.1 < TTL / f < 2.5.

[0059] 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 1.8 < IH / f < 2.8. Satisfying the above range is conducive to increasing the imaging area of the optical lens to offset the picture compression caused by the distortion of the edge field of view of the large field angle, thereby improving the imaging quality of the edge field of view. More specifically, 2 < IH / f < 2.6.

[0060] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy -1.3 < f1 / f < -0.9. Satisfying the above range is conducive to slowing down the change degree of the incident light refraction angle by reasonably setting the focal length of the first lens, avoiding excessive refraction changes to generate too much aberration, and at the same time helping more light to enter the rear optical system, increasing the field angle of the lens while improving the overall imaging quality. More specifically, -1.2 < f1 / f < -1.

[0061] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0.5 < f3 / f < 0.9. Satisfying the above range is conducive to further converging light rays, reducing the difficulty of correcting edge field distortion, and improving overall imaging quality. More specifically, 0.7 < f3 / f < 0.8.

[0062] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -2 < f4 / f < -1. Satisfying the above range can effectively correct aberrations generated at the front end of the lens by reasonably controlling the focal length of the fourth lens, thereby improving the imaging quality of the lens. More specifically, -1.7 < f4 / f < -1.3.

[0063] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -2.4 < f5 / f < -1.4. Satisfying the above range is conducive to increasing the imaging area and improving the imaging quality by reasonably controlling the focal length of the fifth lens. More specifically, -2.1 < f5 / f < -1.7.

[0064] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R1 of the object side surface of the first lens satisfy: 1.6 < R1 / f < 2.3; and the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: 4 < R1 / R2 < 5. Satisfying the above range can make the light entering the first lens have appropriate incidence and exit angles, which is conducive to increasing the field angle of the lens while reducing the outer diameter of the lens, thereby maintaining the miniaturization of the system. More specifically, 1.8 < R1 / f < 2.1; and 4.2 < R1 / R2 < 4.6.

[0065] In some embodiments, the focal length f4 of the fourth lens and the radius of curvature R7 of the object side surface of the fourth lens satisfy: 0.8 < R7 / f4 < 1.3. Satisfying the above range is conducive to further optimizing astigmatism and field curvature by reasonably controlling the ratio of the radius of curvature of the object side surface of the fourth lens to the focal length of the fourth lens. More specifically, 1 < R7 / f4 < 1.1.

[0066] In some embodiments, the focal length f6 of the sixth lens and the radius of curvature R11 of the object side surface of the sixth lens satisfy: -0.4 < R11 / f6 < 0. Satisfying the above range is conducive to strengthening the correction of high-order aberrations by adjusting the surface shape of the object side surface of the sixth lens. More specifically, -0.3 < R11 / f6 < -0.06.

[0067] In some embodiments, the focal length f7 of the seventh lens and the image-side radius of curvature R14 of the seventh lens satisfy: 0 < R14 / f7 < 0.4. Satisfying the above range, the ratio of the image-side radius of curvature of the seventh lens to the focal length of the seventh lens is reasonably controlled, which helps to increase the imaging area and the field of view, and improve the imaging quality. More specifically, 0.14 < R14 / f7 < 0.23.

[0068] In some embodiments, the object-side radius of curvature R7 of the fourth lens and the image-side radius of curvature R8 of the fourth lens satisfy: -4.5 < (R7-R8) / (R7+R8) < -3.5. Satisfying the above range, the shape of the object-side surface and the image-side surface of the fourth lens is reasonably limited, which can control the fourth lens to have an appropriate surface shape, reduce the generation of high-order aberrations, and reduce the difficulty of distortion correction of subsequent lenses. More specifically, -4.2 < (R7-R8) / (R7+R8) < -3.9.

[0069] In some embodiments, the object-side radius of curvature R13 of the seventh lens and the image-side radius of curvature R14 of the seventh lens satisfy: -14.2 < (R13+R14) / (R13-R14) < -7.8. Satisfying the above range, the shape of the object-side surface and the image-side surface of the seventh lens is reasonably limited, which can control the seventh lens to have an appropriate surface shape, effectively improve the field curvature and aberration, and improve the imaging quality. More specifically, -13.1 < (R13+R14) / (R13-R14) < -8.6.

[0070] In some embodiments, the total optical length TTL of the optical lens and the sum ∑CT of the center thicknesses of the first lens to the seventh lens along the optical axis satisfy: 2 < TTL / ∑CT < 2.5. Satisfying the above range, the total optical length of the optical lens and the sum of the thicknesses of the lenses are reasonably configured, which helps to realize high-pixel characteristics and improve the imaging quality of the optical lens. More specifically, 2.1 < TTL / ∑CT < 2.4.

[0071] In some embodiments, the center thickness CT5 of the fifth lens, the object-side radius of curvature R9 of the fifth lens, and the image-side radius of curvature R10 of the fifth lens satisfy: 1.3 < (R10+CT5) / R9 < 1.6. Satisfying the above range, by reasonably setting the relationship between the surface shape and the thickness of the fifth lens, the yield is improved. More specifically, 1.4 < (R10+CT5) / R9 < 1.5.

[0072] In some embodiments, the optical lens satisfies the condition formula: 3.6mm < f < 5mm, 122° < FOV < 148°, 1.4mm < EPD < 1.9mm, 8.8mm < TTL < 10.6mm, 2.4 < Fno < 2.8, 7.2mm < IH < 12.8mm, 26.9° < CRA < 41.6°, 1.3mm < BFL < 2.2mm, wherein f represents an effective focal length of the optical lens, FOV represents a maximum field of view angle of the optical lens, EPD represents an entrance pupil diameter of the optical lens, TTL represents an optical total length of the optical lens, Fno represents an aperture value of the optical lens, IH represents a real image height corresponding to the maximum field of view angle of the optical lens, CRA represents a chief ray angle of incidence at the maximum image height of the optical lens, and BFL represents a back focal length of the optical lens. The above condition is satisfied, indicating that the optical lens provided by the embodiment has at least the characteristics of a large field of view angle, a large target surface and miniaturization. Preferably, 3.9mm < f < 4.7mm, 132° < FOV < 136°, 1.5mm < EPD < 1.8mm, 9.7mm < TTL < 9.9mm, 2.5 < Fno < 2.7, 8mm < IH < 12mm, 29.1° < CRA < 38°, 1.5mm < BFL < 2.0mm.

[0073] 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 adopts a glass-plastic hybrid collocation structure of seven lenses, which can make the optical lens achieve a reasonable balance of miniaturization, high pixels, thinness and wide view angle. Specifically, the second lens can adopt a glass lens, and the first lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens can all be plastic lenses. The 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.

[0074] 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 the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number and size of the lenses and better achieving lens miniaturization. More specifically, the second lens in the optical lens provided by the embodiment can adopt a spherical lens, and the first lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens can adopt aspherical lenses.

[0075] 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:

[0076]

[0077] wherein z is the distance of the curved surface to the vertex of the curved surface 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 vertex of the curved surface, K is the quadratic curved surface coefficient, and B, C, D, E, F, G, and H are the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order curved surface coefficients, respectively.

[0078] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are merely the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, and any change, replacement, combination, or simplification made without departing from the innovative points of the application should be regarded as equivalent replacement, and all are included in the protection scope of the application.

[0079] Embodiment 1

[0080] Please refer to Figure 1 , which is a structural schematic diagram of an optical lens 100 provided in Embodiment 1 of the application. The optical lens 100 includes, in order from the object side to the imaging surface along the optical axis, a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0081] The first lens L1 has negative focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface.

[0082] The second lens L2 has positive focal power, the object side surface S3 is a convex surface, and the image side surface S4 is a plane.

[0083] The third lens L3 has positive focal power, and both the object side surface S5 and the image side surface S6 are convex surfaces.

[0084] The fourth lens L4 has negative focal power, the object side surface S7 is a concave surface, and the image side surface S8 is a concave surface near the optical axis.

[0085] The fifth lens L5 has negative focal power, the object side surface S9 is a concave surface, and the image side surface S10 is a convex surface.

[0086] The sixth lens L6 has positive focal power, the object side surface S11 is a concave surface, and the image side surface S12 is a convex surface.

[0087] The seventh lens L7 has positive focal power, the object side surface S13 is a convex surface near the optical axis, and the image side surface S14 is a concave surface near the optical axis.

[0088] The object side surface S15 and the image side surface S16 of the filter G1 are both planes.

[0089] The imaging surface S17 is a plane.

[0090] The second lens L2 is a glass spherical lens; the first lens L1, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are plastic aspherical lenses.

[0091] The related parameters of the lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0092] Table 1-1

[0093]

[0094]

[0095] The aspherical surface parameters of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0096] Table 1-2

[0097]

[0098] In this embodiment, the field curvature 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

[0099] Figure 2 The field curvature curve of Embodiment 1 is shown, which represents the curvature of the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.1 mm, which shows that the optical lens 100 can well correct the field curvature.

[0100] Figure 3 The axial aberration curve of Embodiment 1 is shown, which represents the chromatic 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, which shows that the optical lens 100 can well correct the axial aberration.

[0101] Figure 4 ​The diagram shows the transverse chromatic aberration curves for Example 1, representing the chromatic aberration of each wavelength relative to the center wavelength (0.56 μm) at different image heights on the imaging plane. The horizontal axis represents the transverse chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the normalized field of view. As can be seen from the diagram, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2 μm, indicating that the optical lens 100 can effectively correct chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane.

[0102] Example 2

[0103] Please see Figure 5 The figure shown is a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0104] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0105] Table 2-1

[0106]

[0107] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0108] Table 2-2

[0109]

[0110] In this embodiment, the field curvature curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 6 , Figure 7 , Figure 8 As shown. From Figure 6 As can be seen, the field curvature is controlled within ±0.1mm, indicating that the field curvature of the 200mm optical lens is well corrected; from Figure 7 As can be seen, the axial aberration shift is within ±0.04mm, indicating that the axial aberration of the optical lens 200 is well corrected; from Figure 8 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±3μm, indicating that the transverse chromatic aberration of the optical lens 200 is well corrected.

[0111] Example 3

[0112] Please see Figure 9 The figure shown is a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0113] The related parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3-1.

[0114] Table 3-1

[0115]

[0116]

[0117] The surface type parameters of the aspherical lenses of the optical lens 300 in Embodiment 3 are shown in Table 3-2.

[0118] Table 3-2

[0119]

[0120] In this embodiment, the field curvature curve, the axial aberration curve and the transverse chromatic aberration curve of the optical lens 300 are shown in Figure 10 , Figure 11 , Figure 12 respectively. As can be seen from Figure 10 , the field curvature is controlled within ±0.1 mm, which indicates that the field curvature of the optical lens 300 is well corrected; as can be seen from Figure 11 , the shift of the axial aberration is within ±0.04 mm, which indicates that the axial aberration of the optical lens 300 is well corrected; as can be seen from Figure 12 , the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, which indicates that the transverse chromatic aberration of the optical lens 300 is well corrected.

[0121] Please refer to Table 4 for the optical properties corresponding to each of the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view angle, the maximum field of view angle FOV of the optical lens, and the numerical value corresponding to each conditional expression in each embodiment.

[0122] Table 4

[0123]

[0124]

[0125] Compared with the prior art, the optical lens provided by the present application has at least the following advantages:

[0126] (1) The balance of high pixels and thinness can be achieved. Since the plastic lens is more lightweight, the optical lens provided by the present application adopts a glass-plastic hybrid structure of one glass lens and six plastic lenses, achieving the balance of high pixels and thinness of the optical lens.

[0127] (2) can realize large field angle, short total length, the optical lens of the application can realize large angle shooting, realizes miniaturization of the optical lens, satisfies the use demand of high image quality, wide angle shooting of the unmanned plane.

[0128] In conclusion, the optical lens provided by the application adopts seven pieces of glass-plastic hybrid structure, through specific surface shape setting and reasonable focal power distribution, the structure of the optical lens is relatively compact, the large field angle of the lens can be realized, meanwhile, the optical lens has high imaging quality, high definition imaging is realized, meanwhile, the overall aberration of the optical lens can be reasonably corrected, the optical lens has high pixels, meanwhile, the overall length of the optical lens is effectively shortened, the use demand of the unmanned plane of light and thin, high image quality, wide angle shooting is better satisfied.

[0129] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained 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.

[0130] The above-described embodiments only express several implementation manners of the present application, the description is relatively specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be noted that, for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which belong to 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 comprising seven lenses, characterized in that, 依次包括从物体侧到成像平面沿光轴方向的: 具有负屈光力的第一透镜,其物体侧表面是凸面,其图像侧表面是凹面; 具有正屈光力的第二透镜,其物体侧表面是凸面,其图像侧表面是平面; 具有正屈光力的第三透镜,其物体侧表面和图像侧表面均为凸面; 具有负屈光力的第四透镜,其物体侧表面是凹面,其图像侧表面在近光轴处是凹面; 具有负屈光力的第五透镜,其物体侧表面是凹面,其图像侧表面是凸面; 具有正屈光力的第六透镜,其物体侧表面是凹面,其图像侧表面是凸面; 具有正屈光力的第七透镜,其物体侧表面在近光轴处是凸面,其图像侧表面在近光轴处是凹面; 其中,所述光学镜头的有效焦距f与所述第七透镜的焦距f7满足:5.4 < f7 / f < 10.5; 所述光学镜头最大视场角对应的真实像高IH与所述光学镜头最大半视场角的弧度θ满足:3.4mm < (IH / 2) / θ < 5.5mm。 2. The optical lens according to claim 1, characterized in that, 所述光学镜头最大视场角对应的真实像高IH与所述光学镜头的入瞳直径EPD满足:4.8 < IH / EPD < 7.2。 3. The optical lens according to claim 1, characterized in that, 所述光学镜头的有效焦距f与所述第七透镜的焦距f7满足:5.9 < f7 / f < 9.5; 所述光学镜头最大视场角对应的真实像高IH与所述光学镜头最大半视场角的弧度θ满足:3.4mm < (IH / 2) / θ < 5.1mm。 4. The optical lens according to claim 1, characterized in that, 所述光学镜头的有效焦距f与所述第二透镜的焦距f2满足:0.6 < f2 / f < 1.4。 5. The optical lens according to claim 1, characterized in that, 所述光学镜头的有效焦距f与所述第六透镜的焦距f6满足:12.2 < f6 / f < 61.4;所述光学镜头的有效焦距f与所述第六透镜的物体侧表面曲率半径R11满足:-4.4 < R11 / f < -2.9。 6. The optical lens according to claim 1, characterized in that, 所述光学镜头的有效焦距f与所述第三透镜、所述第四透镜、所述第五透镜、所述第六透镜和所述第七透镜的组合焦距f34567满足:1.6 < f34567 / f < 2.9。 7. The optical lens according to claim 1, characterized in that, 所述光学镜头的有效焦距f与所述第四透镜的物体侧表面曲率半径R7满足:-2 < R7 / f < -1.2;所述第四透镜的物体侧表面曲率半径R7与所述第四透镜的图像侧表面曲率半径R8满足:-0.8 < R7 / R8 < -0.4。 8. The optical lens according to claim 1, characterized in that, 所述光学镜头的有效焦距f与所述第七透镜的图像侧表面曲率半径R14满足:1.1 < R14 / f < 1.7;所述第七透镜物体侧表面曲率半径R13与所述第七透镜图像侧表面曲率半径R 9. The optical lens according to claim 1, characterized in that, The sagittal height Sag7 of the clear aperture on the object side of the fourth lens and the clear aperture diameter d7 of the clear aperture on the object side of the fourth lens satisfy: -0.35 < Sag7 / d7 < -0.2; the sagittal height Sag14 of the clear aperture on the image side of the seventh lens and the clear aperture diameter d14 of the clear aperture on the image side of the seventh lens satisfy: -0.35 < Sag14 / d14 < -0.

1.

10. The optical lens according to claim 1, characterized in that, The radius of curvature R11 of the object side of the sixth lens and the radius of curvature R12 of the image side of the sixth lens satisfy: 5.2 < (R11 + R12) / (R11 - R12) < 26.1; the sagittal height Sag11 of the clear aperture on the object side of the sixth lens and the clear aperture diameter d11 of the clear aperture on the object side of the sixth lens satisfy: -0.2 < Sag11 / d11 < 0.

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