Optical lens

Abstract

The invention provides an optical lens, which comprises seven lenses, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface, the second lens has positive focal power; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex 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 convex surface, and the image side surface of the fifth lens is a concave surface; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; and 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. According to the optical lens provided by the invention, the imaging quality of the optical lens can be improved, the aberration can be reduced, the imaging quality of the optical lens can be improved, and the lens has one or more advantages of large target surface, 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] The first lens has a negative optical power, its object-side surface is convex and its image-side surface is concave;

[0008] a second lens having positive optical power;

[0009] a third lens element having negative optical power, whose object-side surface is concave and whose image-side surface is convex;

[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 positive refractive power, whose object-side surface is convex and whose image-side surface is concave;

[0012] a sixth lens element having negative optical power, whose object-side surface is convex and whose image-side surface is concave;

[0013] a seventh lens element having positive refractive power, whose object-side surface is convex and whose image-side surface is concave;

[0014] The object-side curvature radius R1 of the first lens and the image-side curvature radius R2 of the first lens satisfy the following relationship: 0.2<(R1-R2) / (R1+R2)<0.7;

[0015] The radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: |(R3 - R4) / (R3 + R4)| < 0.4.

[0016] Further preferably, the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 5.2 < TTL / f < 5.8; 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: 4.7 < TTL / IH < 5.

[0017] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -4.1 < f1 / f < -2.1; the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: 1.2 < R1 / f < 3.4; the radius of curvature R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: 0.6 < R2 / f < 1.

[0018] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 3.6 < f2 / f < 5.2; the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: 0.5 < R3 / R4 < 1.4.

[0019] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -5.2 < f3 / f < -1.6; the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.4 < f7 / f < 1.6.

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.8 < f4 / f < 2.1; 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: 1.6 < R7 / f < 2.2; 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: -3.7 < R8 / f < -2.8.

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 1.6 < f5 / f < 2.1; the radius of curvature R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 0.9 < R9 / f < 1.2; the radius of curvature R10 of the image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 40 < R10 / f < 45.

[0022] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -1.4 < f6 / f < -1.2; the radius of curvature R11 of the object side surface of the sixth lens and the effective focal length f of the optical lens satisfy: 40 < R11 / f < 45; the radius of curvature R12 of the image side surface of the sixth lens and the effective focal length f of the optical lens satisfy: 0.8 < R12 / f < 1.

[0023] Further preferably, the combined focal length f123 of the first lens, the second lens and the third lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: -2 < f123 / f4567 < -1.4; the combined focal length f56 of the fifth lens and the sixth lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: -19 < f56 / f4567 < -4.

[0024] Further preferably, the focal length f3 of the third lens and the focal length f5 of the fifth lens satisfy: -2.6 < f3 / f5 < -0.9; the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -1 < (R9 - R10) / (R9 + R10) < -0.9.

[0025] 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 aberration, and improve the imaging quality of the optical lens, enabling the lens to have one or more advantages such as a large target surface, a large aperture, and high imaging quality. 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 description of the embodiments in conjunction with the following 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 an F-Tan(Theta) 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 5Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0032] Figure 6 This is the MTF curve of the optical lens in Example 1 of the present invention.

[0033] Figure 7 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0034] Figure 8 Graph showing the field curvature of the optical lens in Example 2 of the present invention.

[0035] Figure 9 FIG. 4 is a graph showing the F-Tan (Theta) distortion curve of the optical lens in Example 2 of the present invention.

[0036] Figure 10 2 is an axial aberration curve diagram of the optical lens in Example 2 of the present invention.

[0037] Figure 11 Graph showing vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0038] Figure 12 This is an MTF curve diagram of the optical lens in Example 2 of the present invention.

[0039] Figure 13 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0040] Figure 14 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0041] Figure 15 Graph showing the F-Tan (Theta) distortion of the optical lens in Example 3 of the present invention.

[0042] Figure 16 4 is an axial aberration curve diagram of the optical lens in Example 3 of the present invention.

[0043] Figure 17 Graph showing vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0044] Figure 18 This is the MTF curve of the optical lens in Example 3 of the present invention.

[0045] Figure 19 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0046] Figure 20 4 is a field curvature curve diagram of the optical lens in Example 4 of the present invention.

[0047] Figure 21Graph showing the F-Tan (Theta) distortion of the optical lens in Example 4 of the present invention.

[0048] Figure 22 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0049] Figure 23 Graph showing vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0050] Figure 24 This is the MTF curve of the optical lens in Example 4 of the present invention.

[0051] Figure 25 Schematic diagram of the structure of the optical lens in Example 5 of the present invention.

[0052] Figure 26 4 is a field curvature curve diagram of the optical lens in Example 5 of the present invention.

[0053] Figure 27 Graph showing the F-Tan (Theta) distortion of the optical lens in Example 5 of the present invention.

[0054] Figure 28 4 is an axial aberration curve diagram of the optical lens in Example 5 of the present invention.

[0055] Figure 29 Graph showing vertical axis chromatic aberration of the optical lens in Example 5 of the present invention.

[0056] Figure 30 This is the MTF curve of the optical lens in Example 5 of the present invention.

[0057] Figure 31 Schematic diagram of the structure of the optical lens in Example 6 of the present invention.

[0058] Figure 32 Graph showing the field curvature of the optical lens in Example 6 of the present invention.

[0059] Figure 33 FIG. 4 is a graph showing the F-Tan (Theta) distortion curve of the optical lens in Example 6 of the present invention.

[0060] Figure 34 4 is an axial aberration curve diagram of the optical lens in Example 6 of the present invention.

[0061] Figure 35 Graph showing vertical axis chromatic aberration of the optical lens in Example 6 of the present invention.

[0062] Figure 36 This is the MTF curve of the optical lens in Example 6 of the present invention.

[0063] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] The optical lens provided in an embodiment of the present invention comprises seven lenses, which are arranged in order from the object side to the imaging surface along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0072] In some embodiments, the first lens may have negative optical power, its object-side surface is convex, and its image-side surface is concave. 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 is concave, and its image-side surface is convex. The fourth lens may have positive optical power, its object-side surface is convex, and its image-side surface is convex. The fifth lens may have positive optical power, its object-side surface is convex, and its image-side surface is concave. The sixth lens may have negative optical power, its object-side surface is convex, and its image-side surface is concave. The seventh lens may have positive optical power, its object-side surface is convex, and its image-side surface is concave.

[0073] In some embodiments, the optical lens may further include an aperture, which may be located between the third and fourth lens elements. It is understood that the aperture is used to limit the amount of light entering, thereby changing the brightness of the image. When the aperture is located between the third and fourth lens elements, it facilitates correction of aperture aberrations.

[0074] In some embodiments, the optical lens may further include a filter and protective glass, positioned sequentially along the optical axis between the seventh lens element and the imaging surface. The filter is used to filter out interfering light, preventing it from reaching the imaging surface of the optical lens and affecting normal imaging. The protective glass protects the optical lens from damage to the photosensitive chip and enhances the optical lens's impact and scratch resistance, while having little impact on the imaging quality of the optical lens.

[0075] In some embodiments, the fifth lens and the sixth lens can be glued together to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the decentration 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.

[0076] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: 0.2 < (R1 - R2) / (R1 + R2) < 0.7. Meeting the above range can make the collected light enter the rear optical system in a divergent form as much as possible, and at the same time effectively reduce the angle between the light incident on the edge field of view and the object side surface of the first lens, improving the overall relative illumination of the edge of the lens. More specifically, 0.28 < (R1 - R2) / (R1 + R2) < 0.6.

[0077] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: |(R3 - R4) / (R3 + R4)| < 0.4. Meeting the above range, the second lens adopts a double concave shape, controlling the shapes of the object side surface and the image side surface of the second lens, which is beneficial to reducing the difficulty of aberration correction of the subsequent lens and improving the imaging quality. More specifically, -0.3 < (R3 - R4) / (R3 + R4) < 0.14.

[0078] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 5.2 < TTL / f < 5.8. Meeting the above range can effectively limit the length of the lens, which is beneficial to the miniaturization of the optical lens. More specifically, 5.21 < TTL / f < 5.71.

[0079] 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 the optical lens satisfy: 4.7 < TTL / IH < 5. Meeting the above range, when ensuring 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 realizes the balance between the small total length and the large image plane of the lens. More specifically, 4.75 < TTL / IH < 4.94.

[0080] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -4.1 < f1 / f < -2.1; the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: 1.2 < R1 / f < 3.4; the radius of curvature R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: 0.6 < R2 / f < 1. Meeting the above ranges, by setting the first lens to have a negative refractive power and a suitable surface shape, it is beneficial for the first lens to receive light at a larger angle and collect as much light as possible to enter the rear optical system, increasing the light flux while achieving a large field of view. More specifically, -4.05 < f1 / f < -2.17; 1.27 < R1 / f < 3.4; 0.66 < R2 / f < 0.91.

[0081] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 3.6 < f2 / f < 5.2; the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: 0.5 < R3 / R4 < 1.4. Meeting the above ranges, defining the second lens to have an appropriate positive optical power and a suitable surface shape has the effect of converging light, depressing the height of peripheral light, and is beneficial for reducing the aperture of the rear lens. More specifically, 3.66 < f2 / f < 5.13; 0.54 < R3 / R4 < 1.32.

[0082] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -5.2 < f3 / f < -1.6. Meeting the above ranges, it has the effect of diverging light, can disperse the central light and marginal light of each field of view, enabling the rear optical system to have a larger light receiving surface to receive the light emerging from the image side surface of the third lens, achieving a larger light input, and being beneficial for increasing the relative illumination. More specifically, -5.13 < f3 / f < -1.63.

[0083] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.4 < f7 / f < 1.6. Meeting the above ranges, defining the seventh lens to have a positive optical power is beneficial for light convergence, enabling the light trend to smoothly transition to the rear, reducing the height of the light incident on the rear, slowing down the upward trend of the light, avoiding the light energy loss caused by the excessive main ray angle of the large field of view light when reaching the imaging surface, being beneficial for improving the illumination of the edge field of view, and being beneficial for achieving a short optical total length. More specifically, 1.45 < f7 / f < 1.58.

[0084] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.8 < f4 / f < 2.1; 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: 1.6 < R7 / f < 2.2; 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: -3.7 < R8 / f < -2.8. Satisfying the above ranges is conducive to the convergence of light rays, enabling the divergent light rays to smoothly enter the rear optical system and better achieving high-quality imaging of the lens; at the same time, it can effectively correct the distortion of the edge field of view, reduce the degree of deformation of the edge of the captured image, and improve the image quality. More specifically, 1.81 < f4 / f < 2.01; 1.66 < R7 / f < 2.11; -3.64 < R8 / f < -2.82.

[0085] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 1.6 < f5 / f < 2.1; the radius of curvature R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 0.9 < R9 / f < 1.2; the radius of curvature R10 of the image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 40 < R10 / f < 45; the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -1 < (R9 - R10) / (R9 + R10) < -0.9. Satisfying the above ranges defines that the fifth lens has an appropriate positive optical power and a suitable surface shape, which is conducive to light convergence. And the cooperation of the fifth lens with positive optical power and the sixth lens with negative optical power can adjust the optical path difference between different fields of view, improve the resolution, and is conducive to the light entering the rear lens smoothly. Further, it can reduce the field curvature and correct the off-axis aberration of the optical lens. More specifically, 1.67 < f5 / f < 2.06; 0.93 < R9 / f < 1.12; 40.78 < R10 / f < 44.14; -0.97 < (R9 - R10) / (R9 + R10) < -0.94.

[0086] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -1.4 < f6 / f < -1.2; the object-side curvature radius R11 of the sixth lens and the effective focal length f of the optical lens satisfy: 40 < R11 / f < 45; the image-side curvature radius R12 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.8 < R12 / f < 1. Meeting the above ranges and defining that the sixth lens has an appropriate negative optical power and a suitable surface shape can diverge the light rays emerging from the fifth lens, making the light rays in the peripheral field of view show an upward trend, which is conducive to the image points on the imaging surface moving away from the optical axis, so as to facilitate achieving the effect of matching with a large chip, obtaining a larger picture, effectively eliminating aberrations, and improving the resolution ability of the optical lens. More specifically, -1.33 < f6 / f < -1.23; 40.78 < R11 / f < 44.14; 0.84 < R12 / f < 0.91.

[0087] In some embodiments, the combined focal length f123 of the first lens, the second lens and the third lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: -2 < f123 / f4567 < -1.4. Meeting the above range and reasonably setting the focal lengths of the lens groups before and after the aperture is conducive to balancing various aberrations of the system and improving the overall imaging quality. More specifically, -1.97 < f123 / f4567 < -1.46.

[0088] In some embodiments, the combined focal length f56 of the fifth lens and the sixth lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: -19 < f56 / f4567 < -4. Meeting the above range and defining the focal length relationship between the cemented lens group and the lens group behind the aperture 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. More specifically, -18.86 < f56 / f4567 < -4.04.

[0089] In some embodiments, the focal length f3 of the third lens and the focal length f5 of the fifth lens satisfy: -2.6 < f3 / f5 < -0.9. Meeting the above range and reasonably setting the focal length relationship between the third and fifth lenses is conducive to the smooth transition of light rays, simultaneously correcting various aberrations of the optical lens, and improving the imaging quality of the optical lens. More specifically, -2.52 < f3 / f5 < -0.97.

[0090] In some embodiments, 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: 1.8 < IH / EPD < 2.2. Meeting the above range is beneficial to increasing the light transmission amount, making the brightness of the peripheral field and the central field more uniform. More specifically, 1.84 < IH / EPD < 2.13.

[0091] 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: 1 < IH / f < 1.2. 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, 1.08 < IH / f < 1.19.

[0092] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.8 < BFL / f < 1.1. Meeting the above range limits the optical lens to have an appropriate back focus, facilitates the reasonable arrangement of the positions of each lens, and at the same time reduces the processing and assembly difficulty. More specifically, 0.86 < BFL / f < 1.07.

[0093] 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: 0.61 < ∑CT / TTL < 0.69. Meeting the above range and reasonably configuring the total optical length of the optical lens and the sum of the thicknesses of each lens helps to achieve the high-pixel characteristic and improve the imaging quality of the optical lens.

[0094] 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: 3.21 < ΣCT / f < 3.89. 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.

[0095] In some embodiments, the focal length f1 of the first lens and the focal length f4 of the fourth lens satisfy: -2.2 < f1 / f4 < -1.1. Meeting the above range forms a negative-positive optical power combination, which can improve the temperature drift stability performance of the lens, helps to reduce the influence of the environmental temperature on the lens group, and can also meet the compactness requirements of the lens. More specifically, -2.15 < f1 / f4 < -1.1.

[0096] In some embodiments, the focal length f6 of the sixth lens and the focal length f7 of the seventh lens satisfy: -0.9 < f6 / f7 < -0.7. Meeting the above range is beneficial to the smooth transition of light, correcting various aberrations of the optical lens. At the same time, it can appropriately suppress the angle of the marginal field of view incident on the imaging surface, effectively transfer more light beams to the imaging surface, and improve the relative illumination of the optical lens. More specifically, -0.9 < f6 / f7 < -0.77.

[0097] In some embodiments, the optical lens satisfies the following conditional expressions: 6.7 mm < f < 7.4 mm; 3.7 mm < EPD < 4.4 mm; 38 mm < TTL < 40 mm; 1.6 < Fno < 1.9; 15° < CRA < 23°; 6 mm < BFL < 8 mm; 60° < FOV < 70°; 7.5 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 range, the optical lens has at least one or more advantages such as a large target surface, a large aperture, and a long focal length. More specifically, 6.79 mm < f < 7.37 mm; 3.77 mm < EPD < 4.34 mm; 38.07 mm < TTL < 39.44 mm; 1.69 < Fno < 1.81; 15.51° < CRA < 22.36°; 6.09 mm < BFL < 7.78 mm; 63° < FOV < 67°; 7.9 mm < IH < 8.1 mm.

[0098] In some embodiments, the lens material in 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.

[0099] 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, and the sixth lens of the present invention adopt spherical lenses, and the seventh lens adopts an aspherical lens.

[0100] In various embodiments of the present invention, when the lens is an aspheric lens, the shapes of the aspheric surfaces of the optical lens satisfy the following equations:

[0101]

[0102] Where z is the distance between the surface and the vertex in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the surface vertex, K is the quadratic surface coefficient, and B, C, D, E, and F are the fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients, respectively.

[0103] The present invention is further illustrated below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens vary; for details, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the present invention is not limited thereto. Any other changes, substitutions, combinations, or simplifications that do not deviate from the novelties of the present invention shall be considered equivalent replacements and are included within the scope of protection of the present invention.

[0104] Example 1

[0105] 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.

[0106] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0107] The second lens L2 has positive refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0108] The third lens L3 has negative refractive power, its object-side surface S5 is concave, and its image-side surface S6 is convex;

[0109] The fourth lens L4 has positive refractive power, its object-side surface S7 is convex, and its image-side surface S8 is convex;

[0110] The fifth lens L5 has positive refractive power, its object-side surface S9 is convex, and its image-side surface is concave;

[0111] The sixth lens L6 has negative refractive power, its object-side surface is convex, and its image-side surface S11 is concave;

[0112] The fifth lens L5 and the sixth lens L6 form a cemented lens group with negative refractive power. That is, the cemented surface between the image-side surface of the fifth lens L5 and the object-side surface of the sixth lens L6 is S10.

[0113] The seventh lens L7 has positive refractive power, its object-side surface S12 is convex, and its image-side surface S13 is concave;

[0114] The object-side surface S14 and the image-side surface S15 of the filter G1 are both flat surfaces;

[0115] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0116] The imaging surface S18 is a plane.

[0117] The seventh lens L7 is a glass aspherical lens, and the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are glass spherical lenses.

[0118] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0119] Table 1-1

[0120]

[0121] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0122] Table 1-2

[0123] Face number K B C D E F S12 -4.66E+00 2.91E-03 -1.02E-04 5.45E-06 -1.72E-07 2.93E-09 S13 1.16E+01 1.13E-03 7.27E-06 3.09E-06 -2.99E-07 1.63E-08

[0124] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, vertical chromatic aberration curve, and MTF curve of the optical lens 100 are shown as follows: Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 shown.

[0125] 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 ±0.03mm, indicating that the optical lens 100 is able to effectively correct field curvature.

[0126] Figure 3The F-Tan (Theta) distortion curve for Example 1 shows the distortion of light of different wavelengths at different image heights on the imaging plane. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the distortion of the optical lens is controlled within a range of -10% to 0, indicating that the optical lens 100 is capable of effectively correcting distortion.

[0127] Figure 4 The axial aberration curve of Example 1 is shown, which shows the aberration of each wavelength on the optical axis at the imaging plane. The horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within -0.01mm to 0.02mm, indicating that the optical lens 100 is able to correct axial aberration well.

[0128] Figure 5 A vertical chromatic aberration curve for Example 1 is shown. It plots the chromatic aberration of each wavelength relative to the center wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. As can be seen from the graph, the vertical chromatic aberration for both the longest and shortest wavelengths is controlled within a range of -1 μm to 4 μm, demonstrating that the optical lens 100 is capable of excellent chromatic aberration correction.

[0129] Figure 6 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 160 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.

[0130] Example 2

[0131] See also Figure 7 , shown is a schematic structural diagram of the optical lens 200 provided in Example 2 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0132] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0133] Table 2-1

[0134]

[0135]

[0136] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0137] Table 2-2

[0138] Face number K B C D E F S12 -4.76E+00 2.84E-03 -1.02E-04 5.41E-06 -1.73E-07 2.89E-09 S13 1.02E+01 1.22E-03 1.45E-05 3.03E-06 -2.63E-07 1.77E-08

[0139] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, vertical chromatic aberration curve, and MTF curve of the optical lens 200 are shown as follows: Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 shown.

[0140] from Figure 8 It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.03 mm, indicating that the optical lens 200 can correct the field curvature well.

[0141] from Figure 9 It can be seen from the figure that the distortion of the optical lens is controlled within -10% to 0, which means that the optical lens 200 can correct the distortion well.

[0142] from Figure 10 It can be seen from the figure that the offset of the axial aberration is controlled within -0.01 mm to 0.02 mm, indicating that the optical lens 200 can correct the axial aberration well.

[0143] from Figure 11 It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1 μm to 4 μm, indicating that the optical lens 200 can correct chromatic aberration very well.

[0144] from Figure 12 As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. In the range of 0 to 160 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.

[0145] Example 3

[0146] See also Figure 13 , shown is a schematic structural diagram of the optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, the main difference between this embodiment is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0147] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0148] Table 3-1

[0149]

[0150]

[0151] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0152] Table 3-2

[0153] Face number K B C D E F S12 -4.79E+00 2.87E-03 -1.02E-04 5.34E-06 -1.64E-07 2.65E-09 S13 1.04E+01 1.02E-03 6.44E-06 1.80E-06 -1.68E-07 8.91E-09

[0154] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, vertical chromatic aberration curve, and MTF curve of the optical lens 300 are shown as follows: Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 、 Figure 18 shown.

[0155] from Figure 14 It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.02mm to 0.04mm, indicating that the optical lens 300 can correct the field curvature well.

[0156] from Figure 15 It can be seen from the figure that the distortion of the optical lens is controlled within -10% to 0, which means that the optical lens 300 can correct the distortion well.

[0157] from Figure 16 It can be seen from the figure that the offset of the axial aberration is controlled within -0.01 mm to 0.02 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0158] from Figure 17 It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1μm to 4μm, indicating that the optical lens 300 can correct chromatic aberration very well.

[0159] from Figure 18 As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. In the range of 0 to 160 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.

[0160] Example 4

[0161] See also Figure 19, 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 a concave surface; the image-side surface S4 of the second lens L2 is a convex surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0162] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0163] Table 4-1

[0164]

[0165] The surface parameters of the aspheric lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0166] Table 4-2

[0167] Face number K B C D E F S12 -2.68E+00 1.38E-03 -3.93E-07 1.27E-06 -3.83E-08 2.25E-09 S13 8.00E+01 1.23E-03 2.39E-05 2.70E-06 -1.60E-07 1.03E-08

[0168] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, vertical chromatic aberration curve, and MTF curve of the optical lens 400 are shown as follows: Figure 20 、 Figure 21 、 Figure 22 、 Figure 23 、 Figure 24 shown.

[0169] from Figure 20 It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.03 mm, indicating that the optical lens 400 can correct the field curvature well.

[0170] from Figure 21 It can be seen from the figure that the distortion of the optical lens is controlled within a range of -15% to 0, indicating that the optical lens 400 can correct the distortion well.

[0171] from Figure 22 It can be seen from the figure that the offset of the axial aberration is controlled within -0.01 mm to 0.03 mm, indicating that the optical lens 400 can correct the axial aberration well.

[0172] from Figure 23 It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2μm to 3μm, indicating that the optical lens 400 can correct chromatic aberration very well.

[0173] from Figure 24As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. In the range of 0 to 160 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.

[0174] Example 5

[0175] See also Figure 25 , 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 object-side surface S3 of the second lens L2 is a concave surface; the image-side surface S4 of the second lens L2 is a convex surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0176] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0177] Table 5-1

[0178]

[0179] The surface parameters of the aspheric lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0180] Table 5-2

[0181] Face number K B C D E F S12 -2.68E+00 1.36E-03 2.07E-07 1.17E-06 -3.50E-08 2.23E-09 S13 6.35E+01 1.23E-03 2.40E-05 2.54E-06 -1.51E-07 9.81E-09

[0182] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, vertical chromatic aberration curve, and MTF curve of the optical lens 500 are shown as follows: Figure 26 、 Figure 27 、 Figure 28 、 Figure 29 、 Figure 30 shown.

[0183] from Figure 26 It can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.03mm, indicating that the optical lens 500 can correct the field curvature well.

[0184] from Figure 27 It can be seen from the figure that the distortion of the optical lens is controlled within a range of -15% to 0, indicating that the optical lens 500 can correct the distortion well.

[0185] from Figure 28 It can be seen from the figure that the offset of the axial aberration is controlled within -0.01 mm to 0.03 mm, indicating that the optical lens 500 can correct the axial aberration well.

[0186] from Figure 29It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1μm to 3μm, indicating that the optical lens 500 can correct chromatic aberration very well.

[0187] from Figure 30 As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. In the range of 0 to 160 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.

[0188] Example 6

[0189] See also Figure 31 , 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 object-side surface S3 of the second lens L2 is concave; the image-side surface S4 of the second lens L2 is convex; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0190] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6-1.

[0191] Table 6-1

[0192]

[0193]

[0194] The surface parameters of the aspheric lens of the optical lens 600 in Example 6 are shown in Table 6-2.

[0195] Table 6-2

[0196] Face number K B C D E F S12 -2.67E+00 1.36E-03 -9.86E-07 1.04E-06 -3.08E-08 1.88E-09 S13 1.35E+01 1.23E-03 2.49E-05 2.22E-06 -1.28E-07 8.42E-09

[0197] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, vertical chromatic aberration curve, and MTF curve of the optical lens 600 are shown as follows: Figure 32 、 Figure 33 、 Figure 34 、 Figure 35 、 Figure 36 shown.

[0198] from Figure 32 It can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.03mm, indicating that the optical lens 600 can correct the field curvature well.

[0199] from Figure 33 It can be seen from the figure that the distortion of the optical lens is controlled within -15% to 0, indicating that the optical lens 600 can correct the distortion well.

[0200] from Figure 34 It can be seen from the figure that the offset of the axial aberration is controlled within -0.01mm to 0.03mm, indicating that the optical lens 600 can correct the axial aberration well.

[0201] from Figure 35 It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2μm to 3μm, indicating that the optical lens 600 can correct chromatic aberration very well.

[0202] from Figure 36 As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. In the range of 0 to 160 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.

[0203] Please refer to Table 7, 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, chief ray incidence angle CRA at the maximum image height, maximum field of view angle FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0204] Table 7

[0205] Parameters and Conditionals Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 f(mm) 6.81 6.80 7.00 7.13 7.35 7.36 EPD(mm) 3.89 3.78 4.00 3.96 4.08 4.33 TTL(mm) 38.80 38.35 39.43 38.08 38.41 39.12 Fno 1.75 1.80 1.75 1.80 1.80 1.70 CRA(°) 21.99 21.59 22.35 16.05 15.52 15.83 BFL(mm) 6.27 6.33 6.10 7.59 7.77 7.76 IH(mm) 8.00 8.00 8.00 8.00 8.00 8.00 FOV(°) 66.00 66.00 64.00 66.00 64.00 64.00 TTL / f 5.70 5.64 5.63 5.34 5.22 5.32 TTL / IH 4.85 4.79 4.93 4.76 4.80 4.89 IH / EPD 2.06 2.12 2.00 2.02 1.96 1.85 IH / f 1.18 1.18 1.14 1.12 1.09 1.09 BFL / f 0.92 0.93 0.87 1.06 1.06 1.06 ΣCT / TTL 0.68 0.68 0.68 0.63 0.62 0.62 ΣCT / f 3.88 3.86 3.83 3.34 3.22 3.29 f1 / f -2.22 -2.18 -2.25 -3.77 -3.79 -4.04 f2 / f 5.03 5.12 4.82 3.78 3.67 3.80 f3 / f -4.44 -4.23 -5.12 -1.69 -1.64 -1.72 f4 / f 1.98 1.96 2.00 1.86 1.82 1.89 f5 / f 2.02 2.05 2.04 1.71 1.68 1.69 f6 / f -1.26 -1.29 -1.24 -1.32 -1.30 -1.27 f7 / f 1.58 1.58 1.59 1.49 1.46 1.47 f123 / f4567 -1.78 -1.71 -1.96 -1.48 -1.47 -1.51 f56 / f4567 -4.48 -4.66 -4.05 -17.94 -18.85 -14.06 f1 / f4 -1.13 -1.11 -1.13 -2.03 -2.08 -2.14 f3 / f5 -2.19 -2.06 -2.51 -0.99 -0.98 -1.02 f6 / f7 -0.80 -0.81 -0.78 -0.89 -0.89 -0.86 R1 / f 3.36 3.39 3.28 1.31 1.28 1.29 R2 / f 0.90 0.88 0.90 0.68 0.67 0.70 R7 / f 2.03 2.10 2.03 1.72 1.67 1.69 R8 / f -3.00 -2.83 -2.96 -3.34 -3.39 -3.63 R9 / f 1.09 1.11 1.10 0.96 0.94 0.95 R10 / f 44.08 44.13 42.84 42.06 40.81 40.79 R11 / f 44.08 44.13 42.84 42.06 40.81 40.79 R12 / f 0.86 0.88 0.85 0.90 0.88 0.86 R3 / R4 0.58 0.58 0.55 1.31 1.29 1.27 (R1-R2) / (R1+R2) 0.58 0.59 0.57 0.31 0.31 0.29 (R3-R4) / (R3+R4) -0.27 -0.26 -0.29 0.13 0.13 0.12 (R9-R10) / (R9+R10) -0.95 -0.95 -0.95 -0.96 -0.96 -0.95

[0206] 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 a large target area, a large aperture, and high imaging quality.

[0207] 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.

[0208] 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 negative optical power, whose object side is convex and whose image side is concave; A second lens with positive optical power; A third lens with negative optical power, whose object side is concave and whose image side is convex; A fourth lens with positive optical power, whose object side is convex and whose image side is convex; A fifth lens with positive optical power, whose object side is convex and whose image side is concave; A sixth lens with negative optical power, whose object side is convex and whose image side is concave; A seventh lens with positive optical power, whose object side is convex and whose image side is concave; Wherein, the curvature radius R1 of the object side of the first lens and the curvature radius R2 of the image side of the first lens satisfy: 0.2 < (R1-R2) / (R1+R2) < 0.7; The curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: |(R3-R4) / (R3+R4)| < 0.

4.

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: 5.2 < TTL / f < 5.8; 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: 4.7 < TTL / IH < 5.

3. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -4.1 < f1 / f < -2.1; The curvature radius R1 of the object side of the first lens and the effective focal length f of the optical lens satisfy: 1.2 < R1 / f < 3.4; The curvature radius R2 of the image side of the first lens and the effective focal length f of the optical lens satisfy: 0.6 < R2 / f < 1.

4. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 3.6 < f2 / f < 5.2; The curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: 0.5 < R3 / R4 < 1.

4.

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: -5.2 < f3 / f < -1.6; The focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.4 < f7 / f < 1.

6.

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: 1.8 < f4 / f < 2.1; The curvature radius R7 of the object side of the fourth lens and the effective focal length f of the optical lens satisfy: 1.6 < R7 / f < 2.2; The curvature radius R8 of the image side of the fourth lens and the effective focal length f of the optical lens satisfy: -3.7 < R8 / f < -2.

8.

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: 1.6 < f5 / f < 2.1; 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 < 1.2; The curvature radius R10 of the image side of the fifth lens and the effective focal length f of the optical lens satisfy: 40 < R10 / f < 45.

8. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -1.4 < f6 / f < -1.2; the object-side curvature radius R11 of the sixth lens and the effective focal length f of the optical lens satisfy: 40 < R11 / f < 45; the image-side curvature radius R12 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.8 < R12 / f < 1.

9. The optical lens according to claim 1, wherein: The combined focal length f123 of the first lens, the second lens, and the third lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens, and the seventh lens satisfy: -2 < f123 / f4567 < -1.4; the combined focal length f56 of the fifth lens and the sixth lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens, and the seventh lens satisfy: -19 < f56 / f4567 < -4.

10. The optical lens according to claim 1, wherein: The focal length f3 of the third lens and the focal length f5 of the fifth lens satisfy: -2.6 < f3 / f5 < -0.9; the object-side curvature radius R9 of the fifth lens and the image-side curvature radius R10 of the fifth lens satisfy: -1 < (R9 - R10) / (R9 + R10) < -0.9.

Images