Optical lens

Abstract

The application discloses an optical lens which is composed of seven lenses and sequentially comprises a first group with positive focal length, a diaphragm, a second group with positive focal length from an object side to an imaging surface along an optical axis. The first lens has negative focal length, the object side surface is a convex surface, and the image side surface is a concave surface. The second lens has negative focal length, the object side surface is a concave surface, and the image side surface is a concave surface. The third lens has positive focal length, the object side surface is a convex surface, and the image side surface is a convex surface. The fourth lens has positive focal length, the object side surface is a convex surface, and the image side surface is a convex surface. The fifth lens has negative focal length, the object side surface is a concave surface, and the image side surface is a concave surface. The sixth lens has positive focal length, the object side surface is a convex surface, and the image side surface is a convex surface. The seventh lens has positive focal length, the object side surface is a convex surface, and the image side surface is a concave surface. The optical lens provided by the application has the characteristics of super wide angle, large aperture and miniaturization through reasonable collocation of seven glass-plastic hybrid lenses.

Description

Technical Field

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

[0002] With the rapid development of drones, security, automobiles, and other fields, the pursuit of imaging effects for their lenses has become more diversified. Currently, drones are developing rapidly, winning the favor of consumers with their unique high-altitude perspective and wide-angle shooting. Correspondingly, the demand for their matching optical lenses is also increasing. The optical lenses are required to not only have high-definition image quality, but also to be able to present large local details, so as to achieve vivid representation of local details even in a high-altitude view and capture close-up images.

[0003] Currently available lenses either have too small an aperture, resulting in dark images, or too small a field of view, failing to fully detect changes in the surrounding environment. Therefore, there is a need to develop an optical lens with superior imaging performance to better meet market demands. Summary of the Invention

[0004] The purpose of this 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 objectives, the technical solution adopted by the present invention is as follows:

[0006] The present invention provides an optical lens composed of seven lenses, which, along the optical axis from the object side to the imaging plane, sequentially include: a first group with positive optical power, an aperture stop, and a second group with positive optical power.

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

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

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

[0010] The third lens has positive optical power, and its object side is convex, as is its image side.

[0011] The fourth lens has positive optical power, and its object side is convex, as is its image side.

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

[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 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 angle of the optical lens, and IH represents the true image height IH corresponding to the maximum field 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 R_{4} 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 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 combinations and reasonable optical power distributions, 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 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 obvious and easy to understand 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 graph of the optical lens in Embodiment 1 of the present invention.

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

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

[0031] Figure 5 is a lateral chromatic aberration curve graph 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 This is a field curvature curve diagram of the optical lens in Embodiment 2 of the present invention.

[0034] Figure 8 This is a distortion curve of the optical lens in Embodiment 2 of the present invention.

[0035] Figure 9 This is an axial aberration curve of the optical lens in Embodiment 2 of the present invention.

[0036] Figure 10 This is a chromatic aberration curve of the optical lens in Embodiment 2 of the present invention.

[0037] Figure 11 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0038] Figure 12 This is a field curvature curve diagram of the optical lens in Embodiment 3 of the present invention.

[0039] Figure 13 This is a distortion curve of the optical lens in Embodiment 3 of the present invention.

[0040] Figure 14 This is an axial aberration curve of the optical lens in Embodiment 3 of the present invention.

[0041] Figure 15 This is a chromatic aberration curve of the optical lens in Embodiment 3 of the present invention.

[0042] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0043] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of this application and are not intended to limit the scope of this 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 terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0045] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not 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 location of the convexity 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 location of the concaveness 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 subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0047] It should also be understood that the terms "comprising," "including," "having," "containing," 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. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0048] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly so specified herein.

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] The optical lens provided in this embodiment of the invention consists of seven lenses. The optical lens includes, along the optical axis from the object side to the imaging plane, the following elements in sequence: a first group with positive optical power, an aperture 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 along the optical axis from the object side to the imaging surface; the second group includes a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence along the optical axis from the object side to the imaging surface.

[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 angle of the optical lens. Meeting the above conditions can make the lens have a smaller overall optical length while having a larger field angle, better achieving 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 angle at the same time, achieve the characteristics of an 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. Meeting the above conditions, by reasonably setting the positive refractive power of the front diaphragm lens group, it is beneficial to converge the light rays within a large angle range to achieve the 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 length of the optical lens 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. Meeting the above conditions, by 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 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. Meeting the above conditions, by 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. Meeting the above conditions, by 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 of the first lens, and R2 represents the curvature radius of the image side of the first lens. Meeting the above conditions, setting the first lens to a convex-concave meniscus surface type helps to converge the incident light rays within a relatively large range, reduce the aperture of the front lens, facilitate the 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 can prevent 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, it is possible to share the negative optical power at the front end of the optical lens, thereby facilitating the avoidance of 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 refractive 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 angle of the system, and at the same time is beneficial to increasing the luminous flux of the system and better realizing a 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, it is possible to further converge the light, reduce the difficulty of edge field distortion correction, ensure that the lens has a small distortion while achieving a large field angle, and improve 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 and fourth lenses 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 at the same time, 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 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 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: 0.7mm < f < 1mm, 8mm < TTL < 10mm, FOV > 180°, 2.5mm < IH < 3.5mm, 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 angle of the optical lens, IH represents the true image height corresponding to the maximum field angle of the optical lens, CRA represents the incident angle of the chief ray 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 structure of seven lenses with a combination of glass and plastic, 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 an aspherical lens is used, the shapes of each aspherical surface of the optical lens satisfy the following equations:

[0083]

[0084] Where 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 vertex of the surface, K is the quadratic surface coefficient, and B, C, D, E, F, G, and H are the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order surface coefficients, respectively.

[0085] The present invention will be further described below with reference to several 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 tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0086] Example 1

[0087] Please see Figure 1 The diagram shows a schematic of the structure of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging plane S16, the following components in sequence: a first lens L1, a second lens L2, a third lens L3, an aperture stop 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 in front of the aperture stop form a first group with positive optical power, and the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 in back of the aperture stop form a second group with positive optical power.

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

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

[0090] The third lens L3 has positive optical power, its object side S5 is convex, and its image side S6 is convex.

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

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

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

[0094] The seventh lens L7 has positive optical power, its object side S12 is convex, and its image side S13 is concave.

[0095] The object-side surface S14 and the image-side surface S15 of filter G1 are both planar.

[0096] The imaging plane 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 profile parameters of the aspherical 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 transverse chromatic aberration curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown.

[0106] Figure 2 The field curvature curve of the optical lens 100 in Embodiment 1 is shown, which represents the field curvature of light in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the field of view (unit: degrees). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within ±0.05 mm, indicating that the optical lens 100 can effectively correct the field curvature.

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

[0108] Figure 4 The diagram shows the axial aberration curve of the optical lens 100 in Embodiment 1. It 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 axial aberration offset is controlled within ±0.02 mm, indicating that the optical lens 100 can correct axial aberration well.

[0109] Figure 5 The diagram shows the transverse chromatic aberration curve of the optical lens 100 in Example 1. It represents the chromatic aberration of each wavelength relative to the center wavelength (0.555 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: micrometers), and the vertical axis represents the normalized field of view. As can be seen from the figure, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2.2 micrometers, indicating that the optical lens 100 can effectively correct transverse chromatic aberration.

[0110] Example 2

[0111] Please see Figure 6 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.

[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 profile parameters of the aspherical 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 transverse chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Figure 9 , Figure 10 As shown.

[0120] from Figure 7 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.05 mm, indicating that the optical lens 200 can effectively correct the field curvature.

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

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

[0123] from Figure 10 As can be seen, the chromatic aberration of the longest and shortest wavelengths is controlled within ±3 micrometers, indicating that the optical lens 200 can effectively correct the chromatic aberration.

[0124] Example 3

[0125] Please see Figure 11 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.

[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 profile parameters of the aspherical 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 transverse chromatic aberration curve of the optical lens 300 are respectively as follows: Figure 12 , Figure 13 , Figure 14 , Figure 15 As shown.

[0134] from Figure 12 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.012 mm, indicating that the optical lens 300 can effectively correct the field curvature.

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

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

[0137] from Figure 15 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2.5 micrometers, indicating that the optical lens 300 can effectively correct transverse chromatic aberration.

[0138] Please refer to Table 4 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, principal ray incident angle CRA at the maximum image height, maximum field of view FOV, and the values ​​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 this invention adopts a seven-element glass-plastic hybrid lens structure. Through specific surface shape settings and reasonable optical power distribution, the structure of the optical lens is relatively compact, enabling a large field of view and a large aperture value for high-definition imaging. At the same time, it can also reasonably correct the overall aberration of the optical lens, giving it high pixel count while effectively shortening its overall length, thus better meeting the needs of drones for miniaturization, large aperture, and ultra-wide-angle shooting.

[0144] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0145] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens consisting of seven pieces of lenses, characterized in that, In order from the object side to the imaging plane along the optical axis, the optical lens comprises in sequence: a first group having positive refractive power, a diaphragm, a second group having positive refractive power; The first group comprises in sequence from the object side to the imaging plane along the optical axis: a first lens, a second lens, and a third lens; and the second group comprises in sequence from the object side to the imaging plane along the optical axis: a fourth lens, a fifth lens, a sixth lens, and a seventh lens; The first lens has negative refractive power, 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; The second lens has negative refractive 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 refractive 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 refractive power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; The fifth lens has negative refractive 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 refractive 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 refractive 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 satisfies a conditional expression: 9.5 < TTL / f < 11.5, 0.04 mm / ° < TTL / FOV < 0.05 mm / °; TTL represents an optical total length of the optical lens, f represents an effective focal length of the optical lens, and FOV represents a maximum field of view angle of the optical lens; The optical lens satisfies a conditional expression: 55° < (f x FOV) / IH < 60°; wherein, f represents an effective focal length of the optical lens, FOV represents a maximum field of view angle of the optical lens, and IH represents a real image height corresponding to the maximum field of view angle of the optical lens.

2. The optical lens of claim 1, wherein, The optical lens satisfies a conditional expression: 2 < fa / fb < 6, wherein, fa represents an effective focal length of the first group, and fb represents an effective focal length of the second group.

3. The optical lens of claim 1, wherein, The optical lens satisfies a conditional expression: 2.5 < TTL / IH < 3.2; wherein, TTL represents an optical total length of the optical lens, and IH represents a real image height corresponding to a maximum field of view angle of the optical lens.

4. The optical lens of claim 1, wherein, The optical lens satisfies a conditional expression: -5 < f1 / f < -3.5, 3 < R1 / R2 < 5; wherein, f represents an effective focal length of the optical lens, f1 represents a focal length of the first lens, R1 represents a curvature radius of the object side surface of the first lens, and R2 represents a curvature radius of the image side surface of the first lens.

5. The optical lens of claim 1, wherein, The optical lens satisfies a conditional expression: -3.5 < f2 / f < -2.5, 3 < f3 / f < 4; wherein, f represents an effective focal length of the optical lens, f2 represents a focal length of the second lens, and f3 represents a focal length of the third lens.

6. The optical lens of claim 1, wherein, The optical lens satisfies a conditional expression: -25 < R3 / f < -10, -15 < R3 / R4 < -5; wherein, f represents an effective focal length of the optical lens, R3 represents a curvature radius of the object side surface of the second lens, and R4 represents a curvature radius of the image side surface of the second lens.

7. The optical lens of claim 1, wherein, The optical lens satisfies a conditional expression: 1.5 < f4 / f < 2.5, -1.8 < f5 / f < -1.2; wherein f represents an effective focal length of the optical lens, f4 represents a focal length of the fourth lens, and f5 represents a focal length of the fifth lens.

8. The optical lens of claim 1, wherein, The optical lens satisfies a conditional expression: 2 < f6 / f < 3.2, 5 < f7 / f < 50; wherein f represents an effective focal length of the optical lens, f6 represents a focal length of the sixth lens, and f7 represents a focal length of the seventh lens.

9. The optical lens of claim 1, wherein, The optical lens satisfies a conditional expression: -61.912 < f45 / f < -20, 0.85 < R7 / R9 < 1; wherein f represents an effective focal length of the optical lens, f45 represents a combined focal length of the fourth lens and the fifth lens, R7 represents a radius of curvature of an object side surface of the fourth lens, and R9 represents a radius of curvature of an image side surface of the fifth lens.

10. The optical lens of claim 1, wherein, The optical lens satisfies a conditional expression: 5 < fa / f < 15, wherein fa represents an effective focal length of the first group, and f represents an effective focal length of the optical lens.

Images