Optical lens

Abstract

The invention provides an optical lens, which comprises seven lenses in total, and sequentially comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power and a fourth lens with negative focal power from an object side to an imaging surface along an optical axis, the second lens has positive focal power; the object side surface of the third lens is a concave surface; 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 object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface; the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a concave surface; wherein the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens meet the formula: (R13 + R14) / (R13-R14) lt, and 0.8. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of long focus, large aperture, high imaging quality and the like.

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] As people's requirements for driving experience continue to increase, automotive optical lenses are increasingly used in intelligent driving, and the status of automotive optical lenses in the automotive-related industries continues to improve.

[0003] Advanced Driver Assistance Systems (ADAS) play a crucial role in intelligent driving. They use various lenses and sensors to collect environmental information to ensure driver safety. Existing ADAS systems require not only a thin, compact form factor with high pixel count and resolution, but also the ability to produce clear images in low-light conditions. Therefore, developing an optical lens with excellent imaging performance is crucial. Summary of the Invention

[0004] In view of the above problems, an object of the present invention is to provide an optical lens having the advantage of excellent imaging quality.

[0005] The technical solution adopted in the present invention is:

[0006] An optical lens, comprising seven lenses, including the following elements in order from the object side to the imaging surface along the optical axis:

[0007] a first lens having positive optical power;

[0008] a second lens having positive optical power;

[0009] a third lens element having negative optical power and a concave object-side surface;

[0010] a fourth lens element having positive refractive power, whose object-side surface is convex and whose image-side surface is convex;

[0011] a fifth lens element having negative optical power, whose object-side surface is concave and whose image-side surface is convex;

[0012] a sixth lens element having positive optical power and a convex object-side surface;

[0013] a seventh lens element having negative optical power, whose object-side surface and image-side surface are concave;

[0014] The object-side curvature radius R13 of the seventh lens element and the image-side curvature radius R14 of the seventh lens element satisfy the relationship: |(R13+R14) / (R13-R14)|<0.8.

[0015] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2 < TTL / f < 3; the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 4 < TTL / IH < 5.

[0016] Further preferably, the maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 15° < FOV / Fno < 20°; the true image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 0.8 < IH / EPD < 1.1.

[0017] Further preferably, the clear aperture radius d1 of the object side of the first lens, the true image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy: 6 < d1 / (IH / 2) / tan(FOV / 2) < 8; the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 0.5 < f4567 / f < 1.2.

[0018] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -5.4 < f3 / f < -0.6; the radius of curvature R5 of the object side of the third lens and the effective focal length f of the optical lens satisfy: -4 < R5 / f < -0.8.

[0019] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.4 < f4 / f < 0.8; the radius of curvature R7 of the object side of the fourth lens and the effective focal length f of the optical lens satisfy: 0.5 < R7 / f < 1.1; the radius of curvature R8 of the image side of the fourth lens and the effective focal length f of the optical lens satisfy: -0.9 < R8 / f < -0.3.

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -2.5 < f5 / f < -0.9; the radius of curvature R9 of the object side of the fifth lens and the effective focal length f of the optical lens satisfy: -0.9 < R9 / f < -0.3; the radius of curvature R10 of the image side of the fifth lens and the effective focal length f of the optical lens satisfy: -1.7 < R10 / f < -0.6.

[0021] Further preferably, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.55 < f6 / f < 1.25; the radius of curvature R11 of the object side of the sixth lens and the effective focal length f of the optical lens satisfy: 0.6 < R11 / f < 1.5.

[0022] More preferably, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: -0.7 < f7 / f < -0.45; the object-side curvature radius R13 of the seventh lens and the effective focal length f of the optical lens satisfy: -1.1 < R13 / f < -0.45; the image-side curvature radius R14 of the seventh lens and the effective focal length f of the optical lens satisfy: 0.4 < R14 / f < 2.1.

[0023] More preferably, the object-side curvature radius R9 of the fifth lens and the image-side curvature radius R10 of the fifth lens satisfy: -0.5 < (R9 - R10) / (R9 + R10) < -0.2; the object-side curvature radius R7 of the fourth lens and the image-side curvature radius R8 of the fourth lens satisfy: |(R7 + R8) / (R7 - R8)| < 0.5.

[0024] The optical lens provided by the present invention adopts seven lenses with specific optical powers. Through specific surface shape combinations and reasonable optical power distributions, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, enabling the lens to have one or more advantages such as long focal length, large aperture, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and understandable from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0026] Figure 1 is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0027] Figure 2 is a field curvature curve graph of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 3 is the F-Tan(Theta) distortion curve of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 4 is the MTF curve graph of the optical lens in Embodiment 1 of the present invention.

[0030] Figure 5 is a schematic structural diagram of the optical lens in Embodiment 2 of the present invention.

[0031] Figure 6 is a field curvature curve graph of the optical lens in Embodiment 2 of the present invention. [[ID=�9]]

[0032] Figure 7 is the F-Tan(Theta) distortion curve of the optical lens in Embodiment 2 of the present invention.

[0033] Figure 8 This is an MTF curve diagram of the optical lens in Example 2 of the present invention.

[0034] Figure 9 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0035] Figure 10 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0036] Figure 11 : This is the F-Tan (Theta) distortion curve of the optical lens in Example 3 of the present invention.

[0037] Figure 12 This is the MTF curve of the optical lens in Example 3 of the present invention.

[0038] Figure 13 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0039] Figure 14 4 is a field curvature curve diagram of the optical lens in Example 4 of the present invention.

[0040] Figure 15 : This is the F-Tan (Theta) distortion curve of the optical lens in Example 4 of the present invention.

[0041] Figure 16 This is the MTF curve of the optical lens in Example 4 of the present invention.

[0042] Figure 17 Schematic diagram of the structure of the optical lens in Example 5 of the present invention.

[0043] Figure 18 4 is a field curvature curve diagram of the optical lens in Example 5 of the present invention.

[0044] Figure 19 : This is the F-Tan (Theta) distortion curve of the optical lens in Example 5 of the present invention.

[0045] Figure 20 This is the MTF curve of the optical lens in Example 5 of the present invention.

[0046] Figure 21 Schematic diagram of the structure of the optical lens in Example 6 of the present invention.

[0047] Figure 22 4 is a field curvature curve diagram of the optical lens in Example 6 of the present invention.

[0048] Figure 23 : This is the F-Tan (Theta) distortion curve of the optical lens in Example 6 of the present invention.

[0049] Figure 24 This is the MTF curve of the optical lens in Example 6 of the present invention.

[0050] Figure 25 Schematic diagram of the structure of the optical lens in Example 7 of the present invention.

[0051] Figure 26 4 is a field curvature curve diagram of the optical lens in Example 7 of the present invention.

[0052] Figure 27 : This is the F-Tan (Theta) distortion curve of the optical lens in Example 7 of the present invention.

[0053] Figure 28 This is the MTF curve of the optical lens in Example 7 of the present invention.

[0054] Figure 29 Schematic diagram of the structure of the optical lens in Example 8 of the present invention.

[0055] Figure 30 4 is a field curvature curve diagram of the optical lens in Example 8 of the present invention.

[0056] Figure 31 : This is the F-Tan (Theta) distortion curve of the optical lens in Example 8 of the present invention.

[0057] Figure 32 This is the MTF curve of the optical lens in Example 8 of the present invention.

[0058] Figure 33 Schematic diagram of the structure of the optical lens in Example 9 of the present invention.

[0059] Figure 34 Graph showing the field curvature of the optical lens in Example 9 of the present invention.

[0060] Figure 35 : This is the F-Tan (Theta) distortion curve of the optical lens in Example 9 of the present invention.

[0061] Figure 36 This is an MTF curve diagram of the optical lens in Example 9 of the present invention.

[0062] Figure 37 Schematic diagram of the structure of the optical lens in Example 10 of the present invention.

[0063] Figure 38 Graph showing the field curvature of the optical lens in Example 10 of the present invention.

[0064] Figure 39 : is the F-Tan (Theta) distortion curve of the optical lens in Example 10 of the present invention.

[0065] Figure 40 This is an MTF curve diagram of the optical lens in Example 10 of the present invention.

[0066] Figure 41 Schematic diagram of the structure of the optical lens in Example 11 of the present invention.

[0067] Figure 42 Graph showing the field curvature of the optical lens in Example 11 of the present invention.

[0068] Figure 43 : This is the F-Tan (Theta) distortion curve of the optical lens in Example 11 of the present invention.

[0069] Figure 44 This is the MTF curve of the optical lens in Example 11 of the present invention.

[0070] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0071] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of 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.

[0072] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of the present invention.

[0073] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0074] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, 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.

[0075] 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 preclude 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 list of 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.

[0076] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0077] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this 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.

[0078] The optical lens provided in an embodiment of the present invention is composed of seven lenses, which are, along the optical axis from the object side to the imaging surface, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens.

[0079] In some embodiments, the first lens may have positive optical power, its object-side surface may be concave or convex, and its image-side surface may be concave or convex. The second lens may have positive optical power, its object-side surface may be concave or convex, and its image-side surface may be concave or convex. The third lens may have negative optical power, its object-side surface may be concave, and its image-side surface may be concave or convex. The fourth lens may have positive optical power, its object-side surface may be convex, and its image-side surface may be convex. The fifth lens may have negative optical power, its object-side surface may be concave, and its image-side surface may be convex. The sixth lens may have positive optical power, its object-side surface may be convex, and its image-side surface may be concave or convex. The seventh lens may have negative optical power, its object-side surface may be concave, and its image-side surface may be concave.

[0080] In some embodiments, the optical lens may further include an aperture which may be located between the third lens and the fourth lens. It can be understood that the aperture is used to limit the amount of incident light so as to change the brightness of the image. Additionally, when the aperture is located between the third lens and the fourth lens, the aperture can reasonably distribute the functions of the first lens to the seventh lens. For example, the first lens, the second lens, and the third lens can be used to receive light to a large extent, and the fourth lens to the seventh lens can be used to correct aberrations, which is beneficial to balancing the structure of the entire optical system. Furthermore, when the aperture is located between the third lens and the fourth lens, it is convenient to correct the aperture aberration.

[0081] In some embodiments, the optical lens may further include a filter and a protective glass, and the filter and the protective glass may be sequentially disposed along the optical axis between the seventh lens and the imaging surface. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging. The protective glass plays a role in protecting the optical lens, preventing the photosensitive chip from being damaged, and can improve the impact resistance and scratch resistance of the optical lens, while having almost no impact on the imaging quality of the optical lens.

[0082] In some embodiments, the fourth lens and the fifth lens may be glued together to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0083] In some embodiments, the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: |(R13 + R14) / (R13 - R14)| < 0.8. Satisfying the above range, the seventh lens has a biconcave shape, which is beneficial to increasing the imaging area and the field angle of the optical lens, beneficial to balancing the aberration of the optical lens, and improving the imaging quality of the optical lens. More specifically, -0.63 < (R13 + R14) / (R13 - R14) < 0.37.

[0084] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2 < TTL / f < 3. Satisfying the above range can effectively limit the length of the lens, which is beneficial to realizing the miniaturization of the optical lens. More specifically, 2.17 < TTL / f < 2.64.

[0085] In some embodiments, the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of view of the optical lens satisfy: 4 < TTL / IH < 5. Meeting the above range ensures that, with the same total length of the lens, it has a larger image plane, can match a larger-sized imaging chip to achieve high-definition imaging, and better achieves the balance between the small total length and the large image plane of the lens. More specifically, 4.24 < TTL / IH < 4.75.

[0086] In some embodiments, the maximum field angle of view FOV of the optical lens and the f-number Fno of the optical lens satisfy: 15° < FOV / Fno < 20°. Meeting the above range defines that the optical lens has an appropriate field angle of view and f-number, can collect light at a large angle, and obtain good imaging quality. More specifically, 15.78° < FOV / Fno < 18.83°.

[0087] In some embodiments, the true image height IH corresponding to the maximum field angle of view of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 0.8 < IH / EPD < 1.1. Meeting the above range can increase the width of the light beam entering the optical lens, improve the brightness at the image plane of the optical lens, and avoid the generation of vignetting. More specifically, 0.86 < IH / EPD < 1.03. <000^224>In some embodiments, the clear aperture radius d1 of the object side of the first lens, the true image height IH corresponding to the maximum field angle of view of the optical lens, and the maximum field angle of view FOV of the optical lens satisfy: 6 < d1 / (IH / 2) / tan(FOV / 2) < 8. Meeting the above range can have a small front aperture while meeting the requirements of a large field angle and a large image plane of the optical lens. More specifically, 6.3 < d1 / (IH / 2) / tan(FOV / 2) < 7.87.

[0089] In some embodiments, the combined focal length f456^ of the fourth lens, the fifth lens, the sixth lens, and the seventh lens and the effective focal length f of the optical lens satisfy: 0.5 < f4567 / f < 1.2. Meeting the above range is beneficial to balancing various aberrations of the system and improving the overall imaging quality by reasonably setting the focal length of the lens group behind the aperture. More specifically, 0.55 < f4567 / f < 1.1.

[0090] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -5.4 < f3 / f < -0.6; the radius of curvature R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: -4 < R5 / f < -0.8. Meeting the above ranges makes the third lens have a negative optical power and the object side surface is concave, which has the effect of diverging light rays, can disperse the central light rays and marginal light rays of each field of view, and can correct the aberration generated by the front lens. More specifically, -4.98 < f3 / f < -0.62; -3.64 < R5 / f < -0.86.

[0091] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.4 < f4 / f < 0.8; the radius of curvature R7 of the object side surface of the fourth lens and the effective focal length f of the optical lens satisfy: 0.5 < R7 / f < 1.1; the radius of curvature R8 of the image side surface of the fourth lens and the effective focal length f of the optical lens satisfy: -0.9 < R8 / f < -0.3; the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: |(R7 + R8) / (R7 - R8)| < 0.5. Meeting the above ranges defines that the fourth lens has an appropriate positive optical power and surface shape, and the light rays are further converged. And gluing the fourth lens with a positive optical power and the fifth lens with a negative optical power is beneficial to making the light rays enter the rear lens gently, can adjust the optical path difference between different fields of view, and improve the resolution. More specifically, 0.44 < f4 / f < 0.72; 0.53 < R7 / f < 0.95; -0.84 < R8 / f < -0.35; -0.16 < (R7 + R8) / (R7 - R8) < 0.4.

[0092] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -2.5 < f5 / f < -0.9; the object-side curvature radius R9 of the fifth lens and the effective focal length f of the optical lens satisfy: -0.9 < R9 / f < -0.3; the image-side curvature radius R10 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.7 < R10 / f < -0.6; the object-side curvature radius R9 of the fifth lens and the image-side curvature radius R10 of the fifth lens satisfy: -0.5 < (R9 - R10) / (R9 + R10) < -0.2. Meeting the above ranges and defining that the fifth lens has an appropriate negative optical power and surface shape can diverge the light rays emitted by the fourth lens, making the light rays in the marginal field of view show an upward trend, which is beneficial for the image points on the imaging surface to be away from the optical axis, so as to facilitate achieving the effect of matching with a large chip, obtaining a larger picture, effectively eliminating aberration, and improving the resolution ability of the optical lens. More specifically, -2.32 < f5 / f < -0.97; -0.84 < R9 / f < -0.35; -1.66 < R10 / f < -0.64; - .43 < (R9 - R10) / (R9 + R10) < -0.21.

[0093] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.55 < f6 / f < 1.25; the object-side curvature radius R11 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.6 < R11 / f < 1.5. Meeting the above ranges and defining that the sixth lens has a positive optical power and a convex object side is beneficial for light convergence, enabling the light rays to smoothly transition to the rear, reducing the height of the light rays incident on the rear, slowing down the upward trend of the light rays, avoiding the light energy loss caused by the excessive main ray angle of the large field of view light rays reaching the imaging surface, being beneficial for improving the illuminance of the marginal field of view, and being beneficial for achieving a short overall optical length. More specifically, 0.59 < f6 / f < 1.17; 0.61 < R11 / f < 1.44.

[0094] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: - .7 < f7 / f < -0.45; the object-side curvature radius R13 of the seventh lens and the effective focal length f of the optical lens satisfy: -1.1 < R13 / f < -0.45; the image-side curvature radius R14 of the seventh lens and the effective focal length f of the optical lens satisfy: 0.4 < R14 / f < 2.1. Meeting the above ranges can effectively balance various aberrations generated by the front lens group, and at the same time is beneficial for increasing the divergence degree of the light rays, increasing the area of the light rays entering the imaging surface, achieving large target surface imaging of the lens, and improving the imaging quality of the optical lens. More specifically, -0.68 < f7 / f < -0.48; -1.03 < R13 / f < -0.48; 0.42 < R14 / f < 2.07.

[0095] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 0.5 < IH / f < 0.6. Meeting the above range and controlling the image height and focal length of the optical lens within a reasonable range helps the optical lens to have the characteristic of a large image plane and improve the imaging quality. More specifically, 0.5 < IH / f < 0.58.

[0096] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.21 < BFL / f < 0.39. Meeting the above range and defining that the optical lens has an appropriate back focus facilitates the reasonable arrangement of the positions of each lens and reduces the processing and assembly difficulty at the same time.

[0097] In some embodiments, the total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis satisfy: 0.49 < ∑CT / TTL < 0.77. Meeting the above range can effectively compress the total length of the optical lens and is beneficial to the structural design and production process of the optical lens at the same time.

[0098] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis and the effective focal length f of the optical lens satisfy: 1.09 < ΣCT / f < 1.91. Meeting the above range can effectively correct the field curvature and distortion of the optical lens and improve the imaging quality of the optical lens.

[0099] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 1.5 < f1 / f < 27. Meeting the above range, by setting the first lens to have a positive refractive power, it has the effect of converging light rays, reducing the height of peripheral light rays, and is beneficial to reducing the aperture of the rear lens. More specifically, 1.44 < f1 / f < 24.5.

[0100] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 1.3 < f2 / f < 40. Meeting the above range and defining that the second lens has an appropriate positive optical power to further converge light rays can share the positive optical power at the front end of the optical lens, thereby facilitating avoiding excessive light ray deflection caused by overly concentrated optical power of the first lens and reducing the difficulty of aberration correction. More specifically, 1.39 < f2 / f < 37.33.

[0101] In some embodiments, the optical lens satisfies the following conditional expressions: 12 mm < f < 17 mm; 7 mm < EPD < 10 mm; 32 mm < TTL < 37 mm; 1.6 < Fno < 2; 16° < CRA < 26°; 3.4 mm < BFL < 5.2 mm; 29° < FOV < 33°; 7 mm < IH < 8.5 mm. In the above conditional expressions, f represents the effective focal length of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the overall optical length of the optical lens, Fno represents the aperture value of the optical lens, CRA represents the chief ray angle of incidence of the optical lens, BFL represents the back focal length of the optical lens, FOV represents the maximum field angle of the optical lens, and IH represents the true image height corresponding to the maximum field angle of the optical lens. Meeting the above ranges, the optical lens has at least one or more advantages such as a large target surface, a large aperture, and a long focal length characteristic. More specifically, 13.54 mm < f < 15.58 mm; 7.47 mm < EPD < 9.17 mm; 33.2 mm < TTL < 36.1 mm; 1.69 < Fno < 1.91; 16.25° < CRA < 25.14°; 3.4 mm < BFL < 5.15 mm; 29.9° < FOV < 32.1°; 7.54 mm < IH < 8.01 mm.

[0102] In some embodiments, the lens material of the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. On the other hand, when the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The optical lens provided by the present invention can adopt an all-glass lens structure, which can reduce dispersion, effectively correct the chromatic aberration of the optical lens, and improve the imaging quality.

[0103] 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 realizing the miniaturization of the lens. More specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens of the present invention adopt spherical lenses.

[0104] The present invention will be further described in multiple embodiments below. In each embodiment, the thickness, curvature radius, and material selection of each lens in the optical lens are somewhat different. For specific differences, refer to the parameter tables of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following embodiments. Any other changes, substitutions, combinations, or simplifications made without departing 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.

[0105] Example 1

[0106] See also Figure 1 , shown is a schematic structural diagram of the optical lens 100 provided in Example 1 of the present invention. The optical lens 100 includes, in order from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0107] The first lens L1 has positive refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0108] The second lens L2 has positive refractive power, its object-side surface S3 is convex, and its image-side surface S4 is convex;

[0109] The third lens L3 has negative refractive power, its object-side surface S5 is concave, and its image-side surface S6 is concave;

[0110] The fourth lens L4 has positive refractive power, its object-side surface S7 is convex, and its image-side surface is convex;

[0111] The fifth lens L5 has negative optical power, its object-side surface is concave, and its image-side surface S9 is convex;

[0112] The fourth lens L4 and the fifth lens L5 form a cemented lens group with positive refractive power. That is, the cemented surface between the image-side surface of the fourth lens L4 and the object-side surface of the fifth lens L5 is S8.

[0113] The sixth lens L6 has positive refractive power, its object-side surface S10 is convex, and its image-side surface S11 is concave;

[0114] The seventh lens L7 has negative refractive power, its object-side surface S12 is concave, and its image-side surface S13 is concave;

[0115] The object-side surface S14 and the image-side surface S15 of the filter G1 are both flat surfaces;

[0116] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0117] The imaging surface S18 is a plane.

[0118] The first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 , the sixth lens L6 , and the seventh lens L7 are glass spherical lenses.

[0119] Table 1 shows the parameters of the lenses in the optical lens 100 in Example 1.

[0120] Table 1

[0121]

[0122]

[0123] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens 100 are shown as follows: Figure 2 、 Figure 3 、 Figure 4 shown.

[0124] Figure 2 The field curvature curves for Example 1 are shown, representing the degree of curvature of light of different wavelengths in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: degrees). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within -0.01mm to 0.05mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0125] Figure 3 The F-Tan (Theta) distortion curve for Example 1 shows the F-Tan (Theta) distortion of light of different wavelengths at different image heights on the imaging plane. The horizontal axis represents the F-Tan (Theta) distortion value (unit: %), and the vertical axis represents the half field of view angle (unit: °). As can be seen from the figure, the F-Tan (Theta) distortion of the optical lens is controlled within a range of -6% to 0, indicating that the optical lens is capable of effectively correcting distortion.

[0126] Figure 4 The MTF (Modulation Transfer Function) curve for Example 1 is shown, representing the degree of lens imaging modulation at different spatial frequencies across the field of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value of this embodiment is consistently above 0.4 across the entire field of view. Within the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating excellent imaging quality and detail resolution at both low and high frequencies.

[0127] Example 2

[0128] See also Figure 5 , shown is a schematic structural diagram of the optical lens 200 provided in Example 2 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image-side surface S11 of the sixth lens L6 is a convex surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0129] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2.

[0130] Table 2

[0131]

[0132]

[0133] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens 200 are shown as follows: Figure 6 、 Figure 7 、 Figure 8 As shown. Figure 6 It can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within 0 to 0.05 mm, indicating that the optical lens can correct the field curvature well. Figure 7 It can be seen that the F-Tan (Theta) distortion of the optical lens is controlled within -5% to 0, indicating that the optical lens can correct the distortion well. Figure 8 As can be seen, the MTF value of this embodiment is above 0.38 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating good imaging quality and detail resolution at both low and high frequencies.

[0134] Example 3

[0135] See also Figure 9 , shown is a schematic structural diagram of an optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image-side surface S4 of the second lens L2 is concave; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0136] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3.

[0137] Table 3

[0138]

[0139]

[0140] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens 300 are shown as follows: Figure 10 、 Figure 11 、 Figure 12 As shown. Figure 10 It can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.02mm to 0.04mm, indicating that the optical lens can correct the field curvature well. Figure 11It can be seen that the F-Tan (Theta) distortion of the optical lens is controlled within -6% to 0, indicating that the optical lens can correct the distortion well. Figure 12 As can be seen, the MTF value of this embodiment is above 0.48 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating good imaging quality and detail resolution at both low and high frequencies.

[0141] Example 4

[0142] See also Figure 13 , shown is a schematic structural diagram of an optical lens 400 provided in Example 4 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the object-side surface S3 of the second lens L2 is concave; the image-side surface S11 of the sixth lens L6 is convex; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0143] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4.

[0144] Table 4

[0145]

[0146]

[0147] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens 400 are shown as follows: Figure 14 、 Figure 15 、 Figure 16 As shown. Figure 14 It can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within 0 to 0.05 mm, indicating that the optical lens can correct the field curvature well. Figure 15 It can be seen that the F-Tan (Theta) distortion of the optical lens is controlled within -4% to 0, indicating that the optical lens can correct the distortion well. Figure 16 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating good imaging quality and detail resolution at both low and high frequencies.

[0148] Example 5

[0149] See also Figure 17, shown is a schematic structural diagram of an optical lens 500 provided in Example 5 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the image-side surface S4 of the second lens L2 is concave; the image-side surface S11 of the sixth lens L6 is convex; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0150] Table 5 shows the relevant parameters of each lens in the optical lens 500 in Example 5.

[0151] Table 5

[0152]

[0153]

[0154] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens 500 are shown as follows: Figure 18 、 Figure 19 、 Figure 20 As shown. Figure 18 It can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.02mm to 0.05mm, indicating that the optical lens can correct the field curvature well. Figure 19 It can be seen that the F-Tan (Theta) distortion of the optical lens is controlled within -4% to 0, indicating that the optical lens can correct the distortion well. Figure 20 As can be seen, the MTF value of this embodiment is above 0.45 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating good imaging quality and detail resolution at both low and high frequencies.

[0155] Example 6

[0156] See also Figure 21 , shown is a schematic structural diagram of an optical lens 600 provided in Example 6 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image-side surface S2 of the first lens L1 is a convex surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0157] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6.

[0158] Table 6

[0159]

[0160]

[0161] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens 600 are shown as follows: Figure 22 、 Figure 23 、 Figure 24 As shown. Figure 22 It can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.04mm to 0.05mm, indicating that the optical lens can correct the field curvature well. Figure 23 It can be seen that the F-Tan (Theta) distortion of the optical lens is controlled within -0.5% to 0, indicating that the optical lens can correct the distortion well. Figure 24 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating good imaging quality and detail resolution at both low and high frequencies.

[0162] Example 7

[0163] See also Figure 25 , shown is a schematic structural diagram of an optical lens 700 provided in Example 7 of the present invention. Compared with Example 1, this embodiment has the following main differences: the object-side surface S1 of the first lens L1 is concave; the image-side surface S2 of the first lens L1 is convex; the image-side surface S4 of the second lens L2 is concave; the image-side surface S11 of the sixth lens L6 is convex; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0164] The relevant parameters of each lens in the optical lens 700 in Example 7 are shown in Table 7.

[0165] Table 7

[0166]

[0167]

[0168] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens 700 are shown as follows: Figure 26 、 Figure 27 、 Figure 28 As shown. Figure 26 It can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.01mm to 0.05mm, indicating that the optical lens can correct the field curvature well. Figure 27 It can be seen that the F-Tan (Theta) distortion of the optical lens is controlled within -1% to 0, indicating that the optical lens can correct the distortion well. Figure 28As can be seen, the MTF value of this embodiment is above 0.5 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, achieving good imaging quality and detail resolution in both low-frequency and high-frequency conditions.

[0169] Example 8

[0170] See also Figure 29 , shown is a schematic structural diagram of an optical lens 800 provided in Example 8 of the present invention. Compared with Example 1, this embodiment has the following main differences: the object-side surface S1 of the first lens L1 is concave; the image-side surface S2 of the first lens L1 is convex; the image-side surface S11 of the sixth lens L6 is convex; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0171] The relevant parameters of each lens in the optical lens 800 in Example 8 are shown in Table 8.

[0172] Table 8

[0173]

[0174]

[0175] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens 800 are shown as follows: Figure 30 、 Figure 31 、 Figure 32 As shown. Figure 30 It can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.02mm to 0.05mm, indicating that the optical lens can correct the field curvature well. Figure 31 It can be seen that the F-Tan (Theta) distortion of the optical lens is controlled within -3% to 0, indicating that the optical lens can correct the distortion well. Figure 32 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating good imaging quality and detail resolution at both low and high frequencies.

[0176] Example 9

[0177] See also Figure 33, shown is a schematic structural diagram of an optical lens 900 provided in Example 9 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image-side surface S2 of the first lens L1 is convex; the image-side surface S4 of the second lens L2 is concave; the image-side surface S6 of the third lens L3 is convex; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0178] The relevant parameters of each lens in the optical lens 900 in Example 9 are shown in Table 9.

[0179] Table 9

[0180]

[0181]

[0182] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens 900 are shown as follows: Figure 34 、 Figure 35 、 Figure 36 As shown. Figure 34 It can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.03mm to 0.04mm, indicating that the optical lens can correct the field curvature well. Figure 35 It can be seen that the F-Tan (Theta) distortion of the optical lens is controlled within -1% to 0, indicating that the optical lens can correct the distortion well. Figure 36 As can be seen, the MTF value of this embodiment is above 0.5 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, achieving good imaging quality and detail resolution in both low-frequency and high-frequency conditions.

[0183] Example 10

[0184] See also Figure 37 , shown is a schematic structural diagram of the optical lens 1000 provided in Example 10 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image-side surface S2 of the first lens L1 is convex; the image-side surface S4 of the second lens L2 is concave; the image-side surface S6 of the third lens L3 is convex; and the image-side surface S11 of the sixth lens L6 is convex; and the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0185] The relevant parameters of each lens in the optical lens 1000 in Example 10 are shown in Table 10.

[0186] Table 10

[0187]

[0188]

[0189] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens 1000 are shown as follows: Figure 38 、 Figure 39 、 Figure 40 As shown. Figure 38 It can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.03mm to 0.04mm, indicating that the optical lens can correct the field curvature well. Figure 39 It can be seen that the F-Tan (Theta) distortion of the optical lens is controlled within -1% to 0, indicating that the optical lens can correct the distortion well. Figure 40 As can be seen, the MTF value of this embodiment is above 0.48 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating good imaging quality and detail resolution at both low and high frequencies.

[0190] Example 11

[0191] See also Figure 41 , shown is a schematic structural diagram of an optical lens 1100 provided in Example 11 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image-side surface S2 of the first lens L1 is convex; the image-side surface S4 of the second lens L2 is concave; the image-side surface S6 of the third lens L3 is convex; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0192] The relevant parameters of each lens in the optical lens 1100 in Example 11 are shown in Table 11.

[0193] Table 11

[0194]

[0195]

[0196] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens 1100 are shown as follows: Figure 42 、 Figure 43 、 Figure 44 As shown. Figure 42 It can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.04mm to 0.05mm, indicating that the optical lens can correct the field curvature well. Figure 43 It can be seen that the F-Tan (Theta) distortion of the optical lens is controlled within ±1%, indicating that the optical lens can correct the distortion well. Figure 44 As can be seen, the MTF value of this embodiment is above 0.45 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating good imaging quality and detail resolution at both low and high frequencies.

[0197] Please refer to Table 12, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, real image height IH corresponding to the maximum field of view angle, maximum field of view angle FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0198] Table 12

[0199]

[0200]

[0201] In summary, the optical lens provided by the present invention uses seven lenses with specific optical powers. Through the combination of specific surface shapes and reasonable optical power distribution, it is possible to improve the imaging quality of the optical lens, reduce aberrations, and improve the imaging quality of the optical lens, so that the lens has one or more advantages such as long focus, large aperture, and high imaging quality.

[0202] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations 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 any one or more embodiments or examples.

[0203] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An optical lens, comprising seven lenses, characterized in that: It sequentially includes from the object side to the imaging surface along the optical axis: A first lens with positive optical power; A second lens with positive optical power; A third lens with negative optical power, whose object side is concave; A fourth lens with positive optical power, whose object side is convex and whose image side is convex; A fifth lens with negative optical power, whose object side is concave and whose image side is convex; A sixth lens with positive optical power, whose object side is convex; A seventh lens with negative optical power, whose object side is concave and whose image side is concave; Wherein, the curvature radius R13 of the object side of the seventh lens and the curvature radius R14 of the image side of the seventh lens satisfy: |(R13 + R14) / (R13 - R14)| < 0.

8.

2. The optical lens according to claim 1, wherein: The overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2 < TTL / f < 3; the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 4 < TTL / IH < 5.

3. The optical lens according to claim 1, wherein: The maximum field angle FOV of the optical lens and the f-number Fno of the optical lens satisfy: 15° < FOV / Fno < 20°; the true image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 0.8 < IH / EPD < 1.

1.

4. The optical lens according to claim 1, wherein: The clear aperture radius d1 of the object side of the first lens, the true image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy: 6 < d1 / (IH / 2) / tan(FOV / 2) < 8; the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 0.5 < f4567 / f < 1.

2.

5. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -5.4 < f3 / f < -0.6; the curvature radius R5 of the object side of the third lens and the effective focal length f of the optical lens satisfy: -4 < R5 / f < -0.

8.

6. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.4 < f4 / f < 0.8; the curvature radius R7 of the object side of the fourth lens and the effective focal length f of the optical lens satisfy: 0.5 < R7 / f < 1.1; the curvature radius R'8 of the image side of the fourth lens and the effective focal length f of the optical lens satisfy: -0.9 < R8 / f < -0.

3.

7. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -2.5 < f5 / f < -0.9; the curvature radius R9 of the object side of the fifth lens and the effective focal length f of the optical lens satisfy: -0.9 < R9 / f < -0.3; the curvature radius R10 of the image side of the fifth lens and the effective focal length f of the optical lens satisfy: -1.7 < R10 / f < -0.

6.

8. The optical lens according to claim 1, wherein: The focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.55 < f6 / f < 1.25; the object-side curvature radius R11 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.6 < R11 / f < 1.

5.

9. The optical lens according to claim 1, wherein: The focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: -0.7 < f7 / f < -0.45; the object-side curvature radius R13 of the seventh lens and the effective focal length f of the optical lens satisfy: -1.1 < R13 / f < -0.45; the image-side curvature radius R14 of the seventh lens and the effective focal length f of the optical lens satisfy: 0.4 < R14 / f < 2.

1.

10. The optical lens according to claim 1, wherein: The object-side curvature radius R9 of the fifth lens and the image-side curvature radius R10 of the fifth lens satisfy: -0.5 < (R9 - R10) / (R9 + R10) < -0.2; the object-side curvature radius R7 of the fourth lens and the image-side curvature radius R8 of the fourth lens satisfy: |(R7 + R8) / (R7 - R8)| < 0.5.

Images