Optical lens

Abstract

The invention discloses an optical lens, which consists of seven lenses, and sequentially comprises a first group with positive focal power, a diaphragm and a second group with positive focal power from an object side to an imaging surface along an optical axis, the first lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface; the second lens has negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface is a convex surface; the fifth lens has negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface; the sixth lens has positive focal power, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface; the seventh lens has positive focal power, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface. The optical lens provided by the invention at least has the characteristics of ultra-wide angle, large aperture and miniaturization through reasonable matching of the seven glass-plastic mixed lenses.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging lenses, and in particular to an optical lens. Background Art

[0002] With the rapid development of drones, security, automobiles and other fields, the pursuit of imaging effects of the lenses they carry has become more diversified. At present, drones are developing rapidly, and have won the favor of consumers with their unique high-altitude perspective and wide-angle shooting images. Correspondingly, the demand for optical lenses that match them is also increasing. The optical lenses they carry require not only high-definition image quality, but also the ability to present larger local details, so as to achieve high-altitude vision and fully express local details, and shoot local close-up images.

[0003] Currently, the lenses on the market either have too small apertures, which result in dark images, or have too small field of view, which makes it impossible to fully detect changes in the surrounding environment. Therefore, it is necessary to develop an optical lens with good imaging effects to better meet market needs. Summary of the invention

[0004] The object of the present invention is to provide an optical lens that at least solves one of the technical problems existing in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] The present invention provides an optical lens, which is composed of seven lenses and includes: a first group with positive focal power, a stop, and a second group with positive focal power in sequence from the object side to the imaging surface along the optical axis.

[0007] The first group includes a first lens, a second lens, and a third lens in sequence from the object side to the imaging plane along the optical axis; the second group includes a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence from the object side to the imaging plane along the optical axis.

[0008] The first lens has negative optical power, an object side surface thereof is convex, and an image side surface thereof is concave.

[0009] The second lens has negative optical power, and its object side surface is concave, and its image side surface is concave.

[0010] The third lens has positive refractive power, an object-side surface thereof is convex, and an image-side surface thereof is convex.

[0011] The fourth lens has positive refractive power, an object-side surface thereof is convex, and an image-side surface thereof is convex.

[0012] The fifth lens has negative refractive power, and its object side surface is concave, and its image side surface is concave.

[0013] The sixth lens has a positive optical power, its object side is convex, and its image side is convex.

[0014] The seventh lens has a positive optical power, its object side is convex, and its image side is concave.

[0015] In some embodiments, the optical lens satisfies the conditional expressions: 9.5 < TTL / f < 11.5, 0.04 mm / ° < TTL / FOV < 0.05 mm / °; TTL represents the overall optical length of the optical lens, f represents the effective focal length of the optical lens, and FOV represents the maximum field of view angle of the optical lens.

[0016] Further, in some embodiments, the optical lens satisfies the conditional expression: 2 < fa / fb < 6, where fa represents the effective focal length of the first group and fb represents the effective focal length of the second group.

[0017] Further, in some embodiments, the optical lens satisfies the conditional expression: 55° < (f × FOV) / IH < 60°; where f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, and IH represents the true image height IH corresponding to the maximum field of view angle of the optical lens.

[0018] Further, in some embodiments, the optical lens satisfies the conditional expressions: -5 < f1 / f < -3.5, 3 < R1 / R2 < 5; where f represents the effective focal length of the optical lens, f1 represents the focal length of the first lens, R1 represents the curvature radius of the object side of the first lens, and R2 represents the curvature radius of the image side of the first lens.

[0019] Further, in some embodiments, the optical lens satisfies the conditional expressions: -3.5 < f2 / f < -2.5, 3 < f3 / f < 4; where f represents the effective focal length of the optical lens, f2 represents the focal length of the second lens, and f3 represents the focal length of the third lens.

[0020] Further, in some embodiments, the optical lens satisfies the conditional expressions: -25 < R3 / f < -10, -15 < R3 / R4 < -5; where f represents the effective focal length of the optical lens, R3 represents the curvature radius of the object side of the second lens, and R4 represents the curvature radius of the image side of the second lens.

[0021] Further, in some embodiments, the optical lens satisfies the conditional expressions: 1.5 < f4 / f < 2.5, -1.8 < f5 / f < -1.2; where f represents the effective focal length of the optical lens, f4 represents the focal length of the fourth lens, and f5 represents the focal length of the fifth lens.

[0022] Furthermore, in some embodiments, the optical lens satisfies the conditional formula: 2 < f6 / f < 3.2, 5 < f7 / f < 50; where f represents the effective focal length of the optical lens, f6 represents the focal length of the sixth lens, and f7 represents the focal length of the seventh lens.

[0023] Furthermore, in some embodiments, the optical lens satisfies the conditional formula: f45 / f < -20, 0.85 < R7 / R9 < 1; where f represents the effective focal length of the optical lens, f45 represents the combined focal length of the fourth lens and the fifth lens, R7 represents the radius of curvature of the object side surface of the fourth lens, and R9 represents the radius of curvature of the image side surface of the fifth lens.

[0024] Furthermore, in some embodiments, the optical lens satisfies the conditional formula: 5 < fa / f < 15, where fa represents the effective focal length of the first lens group and f represents the effective focal length of the optical lens.

[0025] Compared with the prior art, the optical lens provided by the present invention uses seven lenses with specific optical powers. Through specific surface shape matching and reasonable optical power distribution, the structure of the lens can be relatively compact, with a shorter overall optical length. At the same time, the lens also has a larger field of view angle and can record a larger range of images during shooting. Moreover, due to the reasonable settings of the optical powers and surface shapes of each lens, the imaging quality of the optical lens can be effectively improved, aberrations can be reduced, and the imaging quality of the optical lens can be enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0027] Figure 1 is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 2 is a field curvature curve diagram of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 3 is a distortion curve diagram of the optical lens in Embodiment 1 of the present invention.

[0030] Figure 4 is an axial aberration curve diagram of the optical lens in Embodiment 1 of the present invention.

[0031] Figure 5 is a lateral chromatic aberration curve diagram of the optical lens in Embodiment 1 of the present invention.

[0032] Figure 6 is a schematic structural diagram of the optical lens in Embodiment 2 of the present invention.

[0033] Figure 7 4 is a field curvature curve diagram of the optical lens in Example 2 of the present invention.

[0034] Figure 8 4 is a distortion curve diagram of the optical lens in Example 2 of the present invention.

[0035] Fig. 9 Graph showing the axial aberration of the optical lens in Embodiment 2 of the present invention.

[0036] Fig.10 Graph showing the vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0037] Fig.11 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0038] Fig.12 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0039] Fig.13 3 is a distortion curve diagram of the optical lens in Example 3 of the present invention.

[0040] Fig.14 Graph showing the axial aberration of the optical lens in Embodiment 3 of the present invention.

[0041] Fig.15 Graph showing the vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0042] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0043] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, 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.

[0044] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0045] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0046] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, 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 of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0047] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0048] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0049] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0050] The optical lens provided by the embodiment of the present invention is composed of seven lenses, and the optical lens includes, along the optical axis from the object side to the imaging surface, a first group with positive optical power, a stop, and a second group with positive optical power.

[0051] The first group includes a first lens, a second lens, and a third lens in sequence from the object side to the imaging plane along the optical axis; the second group includes a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence from the object side to the imaging plane along the optical axis.

[0052] The first lens has a negative optical power, its object side is convex, and its image side is concave.

[0053] The second lens has a negative optical power, its object side is concave, and its image side is concave.

[0054] The third lens has a positive optical power, its object side is convex, and its image side is convex.

[0055] The fourth lens has a positive optical power, its object side is convex, and its image side is convex.

[0056] The fifth lens has a negative optical power, its object side is concave, and its image side is concave.

[0057] The sixth lens has a positive optical power, its object side is convex, and its image side is convex.

[0058] The seventh lens has a positive optical power, its object side is convex, and its image side is concave.

[0059] In some embodiments, the optical lens may further include a filter, which is disposed between the seventh lens and the imaging surface. The filter is used to filter out interfering light and prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0060] In some embodiments, the optical lens satisfies the conditional formula: 9.5 < TTL / f < 11.5; where TTL represents the overall optical length of the optical lens, and f represents the effective focal length of the optical lens. Meeting the above conditions can effectively limit the length of the lens and is beneficial to the miniaturization of the optical lens.

[0061] In some embodiments, the optical lens satisfies the conditional formula: 0.04 mm / ° < TTL / FOV < 0.05 mm / °; where TTL represents the overall optical length of the optical lens, and FOV represents the maximum field of view angle of the optical lens. Meeting the above conditions can make the lens have a smaller overall optical length while having a larger field of view angle, and better achieve the balance of small overall length and ultra-wide angle.

[0062] In some embodiments, the optical lens satisfies the conditional formula: 2 < fa / fb < 6, where fa represents the effective focal length of the first group, and fb represents the effective focal length of the second group. Meeting the above conditions, a lens group configuration with positive refractive power is adopted before and after the aperture, which can better converge light, is beneficial to ensuring the miniaturization of the system, can increase the field of view angle at the same time, realize the characteristics of ultra-wide angle, effectively correct various aberrations, improve the imaging quality and clarity, and reduce the sensitivity at the same time.

[0063] In some embodiments, the optical lens satisfies the conditional formula: 5 < fa / f < 15, where fa represents the effective focal length of the first group, and f represents the effective focal length of the optical lens. By satisfying the above conditions and reasonably setting the positive refractive power of the front diaphragm lens group, it is beneficial to converge light rays within a large angular range to achieve an ultra-wide-angle characteristic, and at the same time improve the resolution of the edge field of view, achieving a balance between a relatively short total optical lens length and good imaging quality.

[0064] In some embodiments, the optical lens satisfies the conditional formula: 2.5 < fb / f < 3, where fb represents the effective focal length of the second group, and f represents the effective focal length of the optical lens. By satisfying the above conditions and reasonably setting the positive refractive power of the rear diaphragm lens group, it is beneficial to balance the distortion and astigmatism generated by the front-end lens of the optical lens and improve the imaging quality of the optical lens.

[0065] In some embodiments, the optical lens satisfies the conditional formula: 55° < (f × FOV) / IH < 60°; where f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, and IH represents the true image height IH corresponding to the maximum field of view angle of the optical lens. By satisfying the above conditions and reasonably restricting the relationship between the focal length, field of view angle, and image height of the optical lens, it is beneficial to achieve a large field of view angle of the optical lens, and a larger range of the picture can be recorded during shooting.

[0066] In some embodiments, the optical lens satisfies the conditional formula: -5 < f1 / f < -3.5; where f represents the effective focal length of the optical lens, and f1 represents the focal length of the first lens. By satisfying the above conditions and setting the first lens to have a negative refractive power and a meniscus shape, it is beneficial for the first lens to receive light rays at a larger angle and collect as much light as possible to enter the rear optical system, achieving a large field of view while increasing the light flux, and realizing the effects of ultra-wide angle and large aperture of the lens.

[0067] In some embodiments, the optical lens satisfies the conditional formula: 3 < R1 / R2 < 5; where R1 represents the curvature radius of the object side surface of the first lens, and R2 represents the curvature radius of the image side surface of the first lens. By satisfying the above conditions and setting the first lens to have a convex-concave meniscus surface type, it helps to converge incident light rays within a relatively large range, reduce the aperture of the front lens, facilitate miniaturization of the front part, and at the same time, the first lens can be made of glass material, which has an anti-scratch effect and prevents the lens from being worn during use and affecting the imaging quality.

[0068] In some embodiments, the optical lens satisfies the conditional formula: -3.5 < f2 / f < -2.5; where f represents the effective focal length of the optical lens, and f2 represents the focal length of the second lens. By satisfying the above conditions and reasonably setting the focal length of the second lens, the negative optical power at the front end of the optical lens can be shared, which is beneficial to avoiding excessive light deflection caused by overly concentrated optical power of the first lens and reducing the difficulty of aberration correction.

[0069] In some embodiments, the optical lens satisfies the conditional formulas: 3 < f3 / f < 4, -6 < R5 / R6 < -1.5; where f represents the effective focal length of the optical lens, f3 represents the focal length of the third lens, R5 represents the curvature radius of the object side surface of the third lens, and R6 represents the curvature radius of the image side surface of the third lens. By satisfying the above conditions and reasonably setting the focal length and surface shape of the third lens, it is beneficial to slow down the deflection degree of the incident light, avoid excessive aberration caused by overly strong refraction changes, and at the same time is beneficial to balancing various aberrations generated by the front lens group and improving the overall imaging quality.

[0070] In some embodiments, the optical lens satisfies the conditional formulas: -25 < R3 / f < -10, -15 < R3 / R4 < -5; where f represents the effective focal length of the optical lens, R3 represents the curvature radius of the object side surface of the second lens, and R4 represents the curvature radius of the image side surface of the second lens. By satisfying the above conditions and setting the second lens as a biconcave lens, it is possible to further receive large-angle light into the system to achieve an ultra-large field of view angle of the system, and at the same time is beneficial to increasing the light flux of the system and better realizing the large aperture of the lens.

[0071] In some embodiments, the optical lens satisfies the conditional formula: 1.5 < f4 / f < 2.5; where f represents the effective focal length of the optical lens, and f4 represents the focal length of the fourth lens. By satisfying the above conditions, the light can be further converged, the difficulty of edge field distortion correction can be reduced, ensuring that the lens has a small distortion while achieving a large field of view angle and improving the overall imaging quality.

[0072] In some embodiments, the optical lens satisfies the conditional formula: -1.8 < f5 / f < -1.2; where f represents the effective focal length of the optical lens, and f5 represents the focal length of the fifth lens. By satisfying the above conditions and setting the fifth lens to have an appropriate negative optical power, it is beneficial to diverge the light converged by the third lens and the fourth lens and better correct the aberration of the system.

[0073] In some embodiments, the optical lens satisfies the conditional formula: -1.5 < f4 / f5 < -1.1; where f4 represents the focal length of the fourth lens, and f5 represents the focal length of the fifth lens. By satisfying the above conditions and reasonably setting the focal length relationship between the fourth and fifth lenses, the chromatic aberration of the system can be effectively corrected, and the overall imaging quality can be improved.

[0074] In some embodiments, the optical lens satisfies the conditional formulas: 2 < f6 / f < 3.2, -6 < R10 / R11 < -1.5; where f represents the effective focal length of the optical lens, f6 represents the focal length of the sixth lens, R10 represents the curvature radius of the object side surface of the sixth lens, and R11 represents the curvature radius of the image side surface of the sixth lens. By satisfying the above conditions and reasonably setting the focal length and surface shape of the sixth lens, it is beneficial to improve the light converging ability of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens.

[0075] In some embodiments, the optical lens satisfies the conditional formulas: 5 < f7 / f < 50, 0.01 < R12 / R13 < 1; where f represents the effective focal length of the optical lens, f7 represents the focal length of the seventh lens, R12 represents the curvature radius of the object side surface of the seventh lens, and R13 represents the curvature radius of the image side surface of the seventh lens. By satisfying the above conditions and using the seventh lens with positive refractive power, it is beneficial to converge the diverging light to the rear optical system, shorten the optical path of the peripheral light reaching the imaging surface, and thus improve the resolution quality.

[0076] In some embodiments, the fourth lens and the fifth lens form a cemented lens, and the optical lens satisfies the conditional formulas: f45 / f < -20, 0.85 < R7 / R9 < 1; where f represents the effective focal length of the optical lens, f45 represents the combined focal length of the fourth lens and the fifth lens, R7 represents the curvature radius of the object side surface of the fourth lens, and R9 represents the curvature radius of the image side surface of the fifth lens. By satisfying the above conditions, the fourth and fifth lenses can form a cemented lens with negative optical power. By reasonably setting the focal length and surface shape relationship of the fourth and fifth cemented lenses, the incident light can be appropriately diverged to make the light trend smoother, which is beneficial to improving the relative illumination of the edge field of view.

[0077] In some embodiments, the optical lens satisfies the conditional formula: 3.3 < IH / f < 3.6; where f represents the effective focal length of the optical lens, and IH represents the true image height IH corresponding to the maximum field of view angle of the optical lens. By satisfying the above conditions, the wide-angle characteristics of the lens can be better realized, the large-range shooting requirements can be met, and at the same time, the lens has a small distortion and reduces the deformation degree of the edge image.

[0078] In some embodiments, the optical lens satisfies the conditional formula: 2.5 < TTL / IH < 3.2; where TTL represents the overall optical length of the optical lens, and IH represents the true image height IH corresponding to the maximum field of view angle of the optical lens. Meeting the above conditions can better achieve the miniaturization of the lens. At the same time, when ensuring the same overall length of the lens, it has a larger image plane, can match a larger-sized imaging chip to achieve high-definition imaging.

[0079] In some embodiments, the optical lens satisfies the conditional formula: 0.7 mm < f < 1 mm, 8 mm < TTL < 10 mm, FOV > 180°, 2.5 mm < IH < 3.5 mm, 10° < CRA < 25°, Fno < 2.1, where f represents the effective focal length of the optical lens, TTL represents the overall optical length of the optical lens, FOV represents the maximum field of view angle of the optical lens, IH represents the true image height corresponding to the maximum field of view angle of the optical lens, CRA represents the chief ray angle of incidence of the optical lens, and Fno represents the aperture value of the optical lens. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention at least has the characteristics of ultra-wide angle, miniaturization, and high-quality imaging, can obtain more scene information, meet the requirements of large-range detection of the optical lens, and better meet the use requirements of miniaturization, ultra-wide angle, and large aperture shooting of the drone.

[0080] In some embodiments, all seven lenses in the optical lens can be made of plastic lenses or adopt a structure with a combination of glass and plastic materials. Preferably, the optical lens of the present invention adopts a lens structure with a combination of seven glass and plastic materials, which can enable the optical lens to better match a large target surface chip to achieve high-definition imaging, and at the same time can also achieve a reasonable balance of miniaturization, large image plane, and large wide angle of the optical lens. Specifically, the first lens can be made of a glass lens, and the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all plastic lenses; adopting a glass-plastic hybrid structure can effectively reduce costs, correct aberrations, reduce volume, and provide an optical lens product with higher cost performance.

[0081] 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 of lenses and the size of the lenses, and better achieving the miniaturization of the lens. More specifically, the first lens of the optical lens provided by the present invention can adopt a spherical lens, and the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can adopt aspherical lenses.

[0082] In various embodiments of the present invention, when the lens is an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equations:

[0083]

[0084] Among them, z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the surface vertex, K is the quadratic surface coefficient, 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 surface coefficients respectively.

[0085] The present invention is further described below in multiple embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different. For specific differences, please refer to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any other changes, substitutions, combinations or simplifications that do not deviate from the innovative points of the present invention should be regarded as equivalent replacement methods and are included in the protection scope of the present invention.

[0086] Example 1

[0087] See also Figure 1 , which is a schematic diagram of the structure of an optical lens 100 provided in Embodiment 1 of the present invention, wherein the optical lens 100 includes, from the object side to the imaging surface S16 along the optical axis, a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter G1. The first lens L1, the second lens L2 and the third lens L3 before the aperture constitute a first group with positive power, and the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 after the aperture constitute a second group with positive power.

[0088] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave.

[0089] The second lens L2 has negative refractive power, and its object-side surface S3 is concave, and its image-side surface S4 is concave.

[0090] The third lens L3 has positive refractive power, an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex.

[0091] The fourth lens L4 has positive refractive power, its object-side surface S7 is convex, and its image-side surface is convex.

[0092] The fifth lens L5 has negative refractive power, its object side surface is concave, its image side surface S9 is concave, and the fourth lens L4 and the fifth lens L5 form a cemented lens, and the cemented surface formed by the image side surface of the fourth lens and the object side surface of the fifth lens is S8.

[0093] The sixth lens L6 has positive refractive power, and its object-side surface S10 is a convex surface and its image-side surface S11 is a convex surface.

[0094] The seventh lens L7 has positive refractive power, an object-side surface S12 thereof is convex, and an image-side surface S13 thereof is concave.

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

[0096] The imaging surface S16 is a plane.

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

[0098] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0099] Table 1-1

[0100]

[0101]

[0102] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0103] Table 1-2

[0104] Face number K B C D E F G H S3 5.097E+01 6.409E-05 1.129E-07 -4.436E-06 -2.646E-06 -9.823E-07 -1.836E-07 1.570E-07 S4 -5.986E-01 -3.978E-04 1.092E-02 -8.286E-05 -2.214E-05 2.109E-05 2.534E-05 -3.272E-04 S5 -1.613E+01 4.137E-05 3.275E-04 2.788E-04 -2.781E-04 -3.783E-04 -1.267E-04 1.524E-04 S6 -4.756E-01 -4.830E-05 4.958E-04 1.694E-03 6.666E-04 -2.388E-03 -5.539E-04 4.720E-03 S7 -3.688E-01 1.909E-05 7.514E-04 1.113E-03 3.690E-03 7.547E-03 1.863E-02 5.298E-02 S8 -2.428E+00 -2.836E-03 -2.694E-03 1.980E-04 7.116E-03 2.796E-02 8.835E-02 2.881E-01 S9 -1.316E-01 -2.843E-04 3.007E-04 1.528E-03 4.498E-03 6.851E-03 1.004E-01 -1.194E-01 S10 -4.500E+01 -7.382E-04 -4.892E-04 -5.671E-04 -2.786E-04 1.644E-04 -2.657E-04 1.141E-03 S11 -2.915E-01 3.871E-03 1.042E-03 6.094E-03 1.067E-03 -3.956E-04 -1.350E-03 -3.346E-03 S12 -4.662E+00 8.721E-03 7.295E-05 -1.596E-04 1.221E-05 6.797E-05 7.115E-05 1.997E-05 S13 6.994E+00 1.386E-03 4.238E-03 -9.430E-04 1.796E-04 1.241E-04 3.766E-05 -1.795E-06

[0105] In this embodiment, the field curvature curve, f-θ distortion curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 shown.

[0106] Figure 2 The field curvature curve of the optical lens 100 in Example 1 is shown, which represents the field curvature of light on the meridional image plane and the sagittal image plane, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the field angle (unit: degree). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.05 mm, indicating that the optical lens 100 can well correct the field curvature.

[0107] Figure 3The f-θ distortion curve of the optical lens 100 in Example 1 is shown, which represents the distortion amount corresponding to different field angles of the imaging surface, the horizontal axis represents the distortion amount (unit: percentage), and the vertical axis represents the field angle (unit: degree). It can be seen from the figure that the distortion amount at the maximum edge field of view is within 4%, indicating that the f-θ distortion of the optical lens 100 is well corrected in the entire field of view.

[0108] Figure 4 The axial aberration curve of the optical lens 100 in the present embodiment 1 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, 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 ± 0.02 mm, indicating that the optical lens 100 can better correct the axial aberration.

[0109] Figure 5 The vertical axis chromatic aberration curve of the optical lens 100 in Example 1 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.555 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical axis chromatic aberration value of each wavelength relative to the central wavelength (unit: micron), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2.2 microns, indicating that the optical lens 100 can better correct the vertical axis chromatic aberration.

[0110] Example 2

[0111] See also Figure 6 , shown is a schematic diagram of the structure of the optical lens 200 provided in Example 2 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0112] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0113] Table 2-1

[0114]

[0115]

[0116] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0117] Table 2-2

[0118] Face number K B C D E F G H S3 3.741E+01 -3.807E-04 -3.227E-05 -1.049E-05 1.297E-06 1.954E-06 1.422E-06 1.163E-06 S4 -9.944E-02 -5.308E-03 -1.777E-04 1.559E-04 5.563E-05 -4.451E-05 -1.006E-04 -1.163E-04 S5 -5.198E+01 -2.880E-04 -2.258E-04 -1.849E-04 -6.641E-05 9.107E-06 -2.253E-04 -2.227E-04 S6 -2.674E-01 2.228E-04 5.044E-04 -1.449E-03 8.217E-04 -3.175E-03 -4.376E-03 1.529E-02 S7 -5.209E-01 -1.126E-04 1.686E-03 2.792E-03 4.644E-03 7.408E-03 1.492E-02 4.378E-02 S8 -1.600E+00 3.968E-03 5.231E-01 -3.361E+00 5.181E+00 6.396E+00 -1.546E+01 5.589E-01 S9 -1.353E-01 -4.263E-04 -2.935E-03 3.929E-03 -6.917E-03 7.904E-02 1.530E-01 -3.233E-01 S10 -2.629E+01 -1.519E-04 -7.690E-05 2.357E-04 3.073E-04 4.547E-04 1.339E-03 1.960E-03 S11 -1.841E-01 -2.801E-03 4.340E-04 3.648E-03 8.156E-04 -1.935E-04 -5.928E-03 1.192E-03 S12 -3.787E+00 -3.104E-03 -8.415E-04 -2.086E-04 -4.896E-05 -1.129E-05 -4.578E-06 -4.592E-06 S13 -2.000E+02 -1.764E-03 4.833E-04 1.335E-04 -2.490E-04 -9.017E-05 2.682E-05 7.960E-05

[0119] In this embodiment, the field curvature curve, f-θ distortion curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Fig. 9 , Fig.10 shown.

[0120] from Figure 7 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.05 mm, indicating that the optical lens 200 can correct the field curvature well.

[0121] from Figure 8 It can be seen that the distortion at the maximum edge field of view is within 4%, indicating that the f-θ distortion of the optical lens 200 is well corrected within the entire field of view.

[0122] from Fig. 9 It can be seen that the offset of the axial aberration is controlled within ±0.01 mm, indicating that the optical lens 200 can correct the axial aberration well.

[0123] from Fig.10 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3 microns, indicating that the optical lens 200 can correct the vertical axis chromatic aberration well.

[0124] Example 3

[0125] See also Fig.11 , shown is a schematic diagram of the structure of the optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0126] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0127] Table 3-1

[0128]

[0129]

[0130] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0131] Table 3-2

[0132] Face number K B C D E F G H S3 1.072E+02 -1.796E-04 -1.153E-04 -4.996E-05 -1.218E-05 3.074E-06 2.761E-06 9.175E-07 S4 1.778E-01 -9.584E-04 -6.817E-04 -7.954E-04 -7.239E-04 -8.451E-04 -1.107E-03 -1.783E-03 S5 -4.048E+01 -1.792E-06 3.677E-04 2.282E-04 -1.012E-04 -1.942E-03 -1.760E-03 -8.343E-05 S6 -3.240E-01 2.022E-03 4.461E-03 4.231E-03 6.865E-04 -1.854E-02 -5.747E-02 9.394E-02 S7 -3.688E-01 2.342E-03 1.092E-02 1.809E-02 2.044E-02 1.184E-02 -9.998E-03 -7.773E-03 S8 -6.579E+00 -7.145E-03 -5.645E-02 -8.903E-02 -1.150E-01 -1.288E-01 -6.003E-02 3.870E-01 S9 3.426E-01 -1.234E-03 1.522E-03 5.330E-03 7.963E-03 8.487E-03 3.564E-03 -1.654E-02 S10 -2.653E+01 2.445E-04 5.373E-04 1.416E-03 3.361E-03 5.964E-03 4.788E-03 -4.311E-03 S11 -8.339E-01 -2.152E-04 -1.870E-04 -2.300E-05 -1.002E-04 -3.289E-04 -6.478E-04 -1.027E-03 S12 -2.204E+01 2.138E-04 -3.190E-04 -3.175E-04 -1.811E-04 -7.751E-05 -2.319E-05 -7.675E-06 S13 -5.178E+01 -2.024E-03 -4.180E-05 3.503E-04 2.886E-04 1.933E-04 1.279E-04 8.948E-05

[0133] In this embodiment, the field curvature curve, f-θ distortion curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens 300 are respectively as follows: Fig.12 , Fig.13 , Fig.14 , Fig.15 shown.

[0134] from Fig.12 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.012 mm, indicating that the optical lens 300 can correct the field curvature well.

[0135] from Fig.13 It can be seen that the distortion at the maximum edge field of view is within 2%, indicating that the f-θ distortion of the optical lens 300 is well corrected within the entire field of view.

[0136] from Fig.14 It can be seen that the offset of the axial aberration is controlled within ±0.012 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0137] from Fig.15 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2.5 microns, indicating that the optical lens 300 can correct the vertical axis chromatic aberration well.

[0138] Please refer to Table 4, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f of the optical lens, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view angle, the chief ray incident angle CRA at the maximum image height, the maximum field of view angle FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0139] Table 4

[0140]

[0141]

[0142] Compared with the prior art, the optical lens provided by the present invention has at least the following advantages:

[0143] The optical lens provided by the present invention adopts a seven-piece glass-plastic hybrid lens structure. Through a specific surface shape setting and a reasonable optical focal length distribution, the structure of the optical lens is relatively compact, and a large field of view of the lens can be achieved. At the same time, it has a large aperture value and realizes high-definition imaging. At the same time, it can also reasonably correct the overall aberration of the optical lens, so that the optical lens has a high pixel while effectively shortening the overall length of the optical lens, thereby better meeting the use requirements of miniaturization, large aperture, and ultra-wide-angle shooting of drones.

[0144] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0145] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An optical lens, consisting of seven lenses, characterized in that: It sequentially includes from the object side to the imaging plane along the optical axis: a first group with positive optical power, a diaphragm, and a second group with positive optical power; The first group sequentially includes a first lens, a second lens, and a third lens from the object side to the imaging plane along the optical axis; the second group sequentially includes a fourth lens, a fifth lens, a sixth lens, and a seventh lens from the object side to the imaging plane along the optical axis; The first lens has negative optical power, its object side is convex, and its image side is concave; The second lens has negative optical power, its object side is concave, and its image side is concave; The third lens has positive optical power, its object side is convex, and its image side is convex; The fourth lens has positive optical power, its object side is convex, and its image side is convex; The fifth lens has negative optical power, its object side is concave, and its image side is concave; The sixth lens has positive optical power, its object side is convex, and its image side is convex; The seventh lens has positive optical power, its object side is convex, and its image side is concave; Wherein, the optical lens satisfies the conditional expressions: 9.5 < TTL / f < 11.5, 0.04 mm / ° < TTL / FOV < 0.05 mm / °; TTL represents the overall optical length of the optical lens, f represents the effective focal length of the optical lens, and FOV represents the maximum field of view angle of the optical lens.

2. The optical lens according to claim 1, characterized in that: The optical lens satisfies the conditional expression: 2 < fa / fb < 6, where fa represents the effective focal length of the first group and fb represents the effective focal length of the second group.

3. The optical lens according to claim 1, characterized in that: The optical lens satisfies the conditional expression: 55° < (f × FOV) / IH < 60°; where f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, and IH represents the true image height IH corresponding to the maximum field of view angle of the optical lens.

4. The optical lens according to claim 1, characterized in that: The optical lens satisfies the conditional expressions: -5 < f1 / f < -3.5, 3 < R1 / R2 < 5; where f represents the effective focal length of the optical lens, f1 represents the focal length of the first lens, R1 represents the curvature radius of the object side of the first lens, and R2 represents the curvature radius of the image side of the first lens.

5. The optical lens according to claim 1, characterized in that: The optical lens satisfies the conditional expressions: -3.5 < f2 / f < -2.5, 3 < f3 / f < 4; where f represents the effective focal length of the optical lens, f2 represents the focal length of the second lens, and f3 represents the focal length of the third lens.

6. The optical lens according to claim 1, characterized in that: The optical lens satisfies the conditional expressions: -25 < R3 / f < -10, -15 < R3 / R4 < -5; where f represents the effective focal length of the optical lens, R3 represents the curvature radius of the object side of the second lens, and R4 represents the curvature radius of the image side of the second lens.

7. The optical lens according to claim 1, characterized in that: The optical lens satisfies the conditional expressions: 1.5 < f4 / f < 2.5, -1.8 < f5 / f < -1.2; where f represents the effective focal length of the optical lens, f4 represents the focal length of the fourth lens, and f5 represents the focal length of the fifth lens.

8. The optical lens according to claim 1, characterized in that: The optical lens satisfies the conditional expressions: 2 < f6 / f < 3.2, 5 < f7 / f < 50; where f represents the effective focal length of the optical lens, f6 represents the focal length of the sixth lens, and f7 represents the focal length of the seventh lens.

9. The optical lens according to claim 1, characterized in that: The optical lens satisfies the conditional expressions: f45 / f < -20, 0.85 < R7 / R9 < 1; where f represents the effective focal length of the optical lens, f45 represents the combined focal length of the fourth lens and the fifth lens, R7 represents the radius of curvature of the object side surface of the fourth lens, and R9 represents the radius of curvature of the image side surface of the fifth lens.

10. The optical lens according to claim 1, characterized in that: The optical lens satisfies the conditional expression: 5 < fa / f < 15, where fa represents the effective focal length of the first group, and f represents the effective focal length of the optical lens.

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