Optical lens

Abstract

The invention provides an optical lens, which comprises six lenses which sequentially comprise 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 negative focal power, the object side surface of the second lens near the optical axis is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power; the fourth lens has positive focal power; the fifth lens has negative focal power; the sixth lens has positive focal power; wherein the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens meet the formula: 0.2 lt; (R3-R4) / (R3 + R4) lt; and 0.62. The optical lens provided by the invention has one or more advantages of large target surface, large aperture, small distortion and the like.

Description

Technical Field

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

[0002] At present, with the booming development of automotive assisted driving and autonomous driving technologies, in-vehicle cameras play a crucial role. There are various types of in-vehicle cameras, including interior view, rear view, front view, side view, surround view, etc. Each of them has unique functions and different application scenarios. For example, the main function of the front view wide-angle camera is to accurately identify nearby objects, and it can provide key information for driving in scenarios such as urban road conditions and low-speed vehicle driving.

[0003] The front view camera is a core component of the ADAS (Advanced Driving Assistance System). It not only shoulders the important task of ranging, but also can accurately identify objects and clearly distinguish road markings. Therefore, the visual algorithms required for it are extremely complex and the technical threshold is quite high. In order to give full play to the performance of the front view camera, it has become an urgent task to develop an optical lens with excellent imaging effect. Only in this way can it ensure stable and efficient operation in a complex driving environment and lay a solid foundation for the further development of autonomous driving technology. Summary of the Invention

[0004] Aiming at the above problems, the purpose of the present invention is to provide an optical lens with the advantage of excellent imaging quality.

[0005] The technical solution adopted by the present invention is as follows:

[0006] An optical lens, comprising a total of six lenses, which sequentially include from the object side to the imaging surface along the optical axis:

[0007] A first lens with negative optical power, whose object side is concave and whose image side is convex;

[0008] A second lens with negative optical power, whose object side is convex near the optical axis and whose image side is concave;

[0009] A third lens with positive optical power;

[0010] A fourth lens with positive optical power;

[0011] A fifth lens with negative optical power;

[0012] A sixth lens with positive optical power;

[0013] Wherein, 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: 0.2 < (R3 - R4) / (R3 + R4) < 0.62.

[0014] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.3 < TTL / f < 5.6; the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 4.2 < TTL / IH < 5.1.

[0015] Further preferably, the maximum field of view angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 37° < FOV / Fno < 44°; the true image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1.4 < IH / EPD < 1.8.

[0016] Further preferably, the true image height IH corresponding to the maximum field of view angle of the optical lens and the effective focal length f of the optical lens satisfy: 0.9 < IH / f < 1.15; the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.65 < BFL / f < 1.8.

[0017] Further preferably, the clear aperture semi-diameter d1 of the object side surface of the first lens, the true image height IH corresponding to the maximum field of view angle of the optical lens and the maximum field of view angle FOV of the optical lens satisfy: 2 < d1 / (IH / 2) / tan(FOV / 2) < 3.3; the optical lens further includes a diaphragm located between the second lens and the third lens or between the third lens and the fourth lens, and the combined focal length f behind of all the lenses after the diaphragm and the effective focal length f of the optical lens satisfy: 1.2 < f behind / f < 3.7.

[0018] Further preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -13.4 < f1 / f < -5.1; the curvature radius R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: -4.1 < R1 / f < -2.3; the curvature radius R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: -8.2 < R2 / f < -5.9.

[0019] Further preferably, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -3.2 < f2 / f < -1; the curvature radius R3 of the object side surface of the second lens and the effective focal length f of the optical lens satisfy: 0.55 < R3 / f < 4.6; the curvature radius R4 of the image side surface of the second lens and the effective focal length f of the optical lens satisfy: 0.35 < R4 / f < 1.1.

[0020] Further preferably, 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: -0.45 < (R1 - R2) / (R1 + R2) < -0.29.

[0021] Further preferably, the sagittal height Sag1 of the clear aperture of the object side surface of the first lens and the clear aperture diameter d1 of the object side surface of the first lens satisfy: -0.2 < Sag1 / d1 < -0.12; the sagittal height Sag2 of the clear aperture of the image side surface of the first lens and the clear aperture diameter d2 of the image side surface of the first lens satisfy: -0.08 < Sag2 / d2 < -0.04.

[0022] Further preferably, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens and the central thickness CT1 of the first lens satisfy: 0.39 < (R1 - CT1) / R2 < 0.56; the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens and the central thickness CT2 of the second lens satisfy: 1 < (R3 - CT2) / R4 < 2.6.

[0023] The optical lens provided by the present invention uses six lenses with specific optical powers. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberration, improve the imaging quality of the optical lens, and enable the lens to have one or more advantages such as a large target surface, a large aperture, and small distortion. Description of the Drawings

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and be easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0025] Figure 1 It is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0026] Figure 2 It is a F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 1 of the present invention.

[0027] Figure 3 It is a MTF curve graph of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 4 It is a schematic structural diagram of the optical lens in Embodiment 2 of the present invention.

[0029] Figure 5 It is a F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 2 of the present invention.

[0030] Figure 6 It is a MTF curve graph of the optical lens in Embodiment 2 of the present invention.

[0031] Figure 7 It is a schematic structural diagram of the optical lens in Embodiment 3 of the present invention.

[0032] Figure 8 It is a F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 3 of the present invention.

[0033] Figure 9 It is a MTF curve graph of the optical lens in Embodiment 3 of the present invention.

[0034] Figure 10 It is a schematic structural diagram of the optical lens in Embodiment 4 of the present invention.

[0035] Figure 11 It is a F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 4 of the present invention.

[0036] Figure 12 It is a MTF curve graph of the optical lens in Embodiment 4 of the present invention.

[0037] Figure 13 It is a schematic structural diagram of the optical lens in Embodiment 5 of the present invention.

[0038] Figure 14 It is a F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 5 of the present invention.

[0039] Figure 15 It is a MTF curve graph of the optical lens in Embodiment 5 of the present invention.

[0040] Figure 16 It is a schematic structural diagram of the optical lens in Embodiment 6 of the present invention.

[0041] Figure 17 It is a F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 6 of the present invention.

[0042] Figure 18 It is a MTF curve graph of the optical lens in Embodiment 6 of the present invention.

[0043] Figure 19 It is a schematic structural diagram of the optical lens in Embodiment 7 of the present invention.

[0044] Figure 20 It is a F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 7 of the present invention.

[0045] Figure 21 It is a MTF curve graph of the optical lens in Embodiment 7 of the present invention.

[0046] Figure 22Schematic diagram of the optical lens in Embodiment 8 of the present invention.

[0047] Figure 23 F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 8 of the present invention.

[0048] Figure 24 MTF curve graph of the optical lens in Embodiment 8 of the present invention.

[0049] Figure 25 Schematic diagram of the optical lens in Embodiment 9 of the present invention.

[0050] Figure 26 F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 9 of the present invention.

[0051] Figure 27 MTF curve graph of the optical lens in Embodiment 9 of the present invention.

[0052] Figure 28 Schematic diagram of the optical lens in Embodiment 10 of the present invention.

[0053] Figure 29 F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 10 of the present invention.

[0054] Figure 30 MTF curve graph of the optical lens in Embodiment 10 of the present invention.

[0055] Figure 31 Schematic diagram of the optical lens in Embodiment 11 of the present invention.

[0056] Figure 32 F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 11 of the present invention.

[0057] Figure 33 MTF curve graph of the optical lens in Embodiment 11 of the present invention.

[0058] Figure 34 Schematic diagram of the optical lens in Embodiment 12 of the present invention.

[0059] Figure 35 F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 12 of the present invention.

[0060] Figure 36 MTF curve graph of the optical lens in Embodiment 12 of the present invention.

[0061] Figure 37 Schematic diagram of the optical lens in Embodiment 13 of the present invention.

[0062] Figure 38 It is the F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 13 of the present invention.

[0063] Figure 39 It is the MTF curve graph of the optical lens in Embodiment 13 of the present invention.

[0064] Figure 40 It is the structural schematic diagram of the optical lens in Embodiment 14 of the present invention.

[0065] Figure 41 It is the F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 14 of the present invention.

[0066] Figure 42 It is the MTF curve graph of the optical lens in Embodiment 14 of the present invention.

[0067] Figure 43 It is the structural schematic diagram of the optical lens in Embodiment 15 of the present invention.

[0068] Figure 44 It is the F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 15 of the present invention.

[0069] Figure 45 It is the MTF curve graph of the optical lens in Embodiment 15 of the present invention.

[0070] Figure 46 It is the structural schematic diagram of the optical lens in Embodiment 16 of the present invention.

[0071] Figure 47 It is the F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 16 of the present invention.

[0072] Figure 48 It is the MTF curve graph of the optical lens in Embodiment 16 of the present invention.

[0073] Figure 49 It is the structural schematic diagram of the optical lens in Embodiment 17 of the present invention.

[0074] Figure 50 It is the F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 17 of the present invention.

[0075] Figure 51 It is the MTF curve graph of the optical lens in Embodiment 17 of the present invention.

[0076] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific Embodiments

[0077] To better understand 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 only descriptions of the embodiments of the present application and do not 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.

[0078] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another feature and do not represent any limitation on the feature. Therefore, without departing from the teachings of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0079] In the drawings, for the sake of clarity, the thickness, dimensions and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0080] In this document, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object being photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0081] It should also be understood that the terms "comprises", "comprising", "has", "including" and / or "including having", 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 an expression such as "at least one of..." appears after the list of listed features, it modifies the entire list of listed features rather than an individual element in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0082] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0083] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will describe the present application in detail with reference to the drawings and in combination with the embodiments.

[0084] The optical lens provided by the embodiment of the present invention includes six lenses, which are, 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, and a sixth lens.

[0085] In some embodiments, the first lens may have a negative optical power, its object side may be a concave surface, and its image side may be a convex surface. The second lens may have a negative optical power, its object side may be a convex surface near the optical axis, and its image side may be a concave surface. The third lens may have a positive optical power, its object side may be a convex surface or a concave surface, and its image side may be a concave surface or a convex surface. The fourth lens may have a positive optical power, its object side may be a convex surface or a concave surface, and its image side may be a convex surface or a concave surface. The fifth lens may have a negative optical power, its object side may be a concave surface or a convex surface, and its image side may be a concave surface or a convex surface. The sixth lens may have a positive optical power, its object side may be a convex surface or a concave surface near the optical axis, and its image side may be a concave surface or a convex surface near the optical axis.

[0086] In some embodiments, the optical lens may further include a diaphragm, and the diaphragm may be located between the third lens and the fourth lens or between the second lens and the third lens. It can be understood that the diaphragm is used to limit the amount of incident light to change the brightness of the image.

[0087] In some embodiments, the optical lens may further include a filter and a protective glass, which are sequentially arranged between the sixth lens and the imaging surface along the optical axis. 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 anti-impact and scratch-resistant capabilities of the optical lens, while having almost no impact on the imaging quality of the optical lens.

[0088] 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.

[0089] In some embodiments, the radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy: 0.2 < (R3 - R4) / (R3 + R4) < 0.62. Meeting the above range and controlling the second lens to have an appropriate surface shape can effectively correct spherical aberration and improve the imaging quality.

[0090] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.3 < TTL / f < 5.6; the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 4.2 < TTL / IH < 5.1. Meeting the above ranges is conducive to achieving the balance between the small volume and large image plane of the optical lens, making the lens have a smaller total length. More specifically: 4.33 < TTL / f < 5.51; 4.27 < TTL / IH < 5.02.

[0091] In some embodiments, the maximum field of view angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 37° < FOV / Fno < 44°; the true image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1.4 < IH / EPD < 1.8. Meeting the above ranges reasonably limits the ratio of the field of view angle to the aperture value, can collect light at large angles and obtain good imaging quality. At the same time, reasonably limiting the ratio of the image height to the entrance pupil diameter is conducive to increasing the light passing amount, making the peripheral field of view and the central field of view brighter and more uniform. More specifically: 37.29° < FOV / Fno < 43.05°; 1.49 < IH / EPD < 1.8.

[0092] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the effective focal length f of the optical lens satisfy: 0.9 < IH / f < 1.15; the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.65 < BFL / f < 1.8. Meeting the above ranges reasonably controls the ratio of the image height to the focal length of the optical lens, which helps the optical lens to have a larger image plane. At the same time, limiting the optical lens to have an appropriate back focus is convenient for reasonably arranging the positions of each lens and reducing the processing and assembly difficulty. More specifically: 0.94 < IH / f < 1.11; 0.67 < BFL / f < 1.74.

[0093] In some embodiments, the clear aperture radius d1 of the object side surface of the first lens, the true image height IH corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: 2 < d1 / (IH / 2) / tan(FOV / 2) < 3.3; the optical lens further includes a diaphragm located between the second lens and the third lens or between the third lens and the fourth lens, and the combined focal length f_back of all the lenses after the diaphragm and the effective focal length f of the optical lens satisfy: 1.2 < f_back / f < 3.7. Meeting the above ranges can reasonably arrange the overall geometry of the optical lens and improve its structural stability. At the same time, making the refractive power ratio of the rear lens group of the optical lens within a suitable range can converge light, reduce the difficulty of aberration correction of the lens, and improve the imaging quality of the optical lens. More specifically: 2.07 < d1 / (IH / 2) / tan(FOV / 2) < 3.24; 1.28 < f_back / f < 3.69.

[0094] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -13.4 < f1 / f < -5.1; the object side surface curvature radius R1 of the first lens and the effective focal length f of the optical lens satisfy: -4.1 < R1 / f < -2.3; the image side surface curvature radius R2 of the first lens and the effective focal length f of the optical lens satisfy: -8.2 < R2 / f < -5.9. Meeting the above ranges, by reasonably limiting the refractive power ratio and surface shape of the first lens, the light passing through it can be diverged, which is beneficial to achieving a small front aperture. More specifically: -13.32 < f1 / f < -5.15; -4.06 < R1 / f < -2.39; -8.12 < R2 / f < -5.94.

[0095] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -3.2 < f2 / f < -1; the object side surface curvature radius R3 of the second lens and the effective focal length f of the optical lens satisfy: 0.55 < R3 / f < 4.6; the image side surface curvature radius R4 of the second lens and the effective focal length f of the optical lens satisfy: 0.35 < R4 / f < 1.1. Meeting the above ranges, by reasonably limiting the refractive power ratio and surface shape of the second lens, it is beneficial to achieve a larger light input amount and increase the relative illumination. More specifically: -3.15 < f2 / f < -1.03; 0.58 < R3 / f < 4.54; 0.35 < R4 / f < 1.09.

[0096] In some embodiments, the object side surface curvature radius R1 of the first lens and the image side surface curvature radius R2 of the first lens satisfy: -0.45 < (R1 - R2) / (R1 + R2) < -0.29. Meeting the above range, controlling the first lens to have an appropriate surface shape can diverge the light passing through it, which is beneficial to achieving a small front aperture.

[0097] In some embodiments, the sagittal height Sag1 of the clear aperture of the object side surface of the first lens and the clear aperture diameter d1 of the object side surface of the first lens satisfy: -0.2 < Sag1 / d1 < -0.12; the sagittal height Sag2 of the clear aperture of the image side surface of the first lens and the clear aperture diameter d2 of the image side surface of the first lens satisfy: -0.08 < Sag2 / d2 < -0.04. Meeting the above ranges helps to control the light path and highlight the detailed information of the central field of view of the optical lens.

[0098] In some embodiments, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, and the central thickness CT1 of the first lens satisfy: 0.39 < (R1 - CT1) / R2 < 0.56; the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens, and the central thickness CT2 of the second lens satisfy: 1 < (R3 - CT2) / R4 < 2.6. Meeting the above ranges can control the first lens and the second lens to have appropriate surface profiles and shapes, reduce the difficulty of correcting the distortion of the peripheral field of view, control the distortion within a reasonable range, and facilitate improving the yield rate of manufacturing the lenses. More specifically: 1.06 < (R3 - CT2) / R4 < 2.54.

[0099] In some embodiments, the sum ΣCT of the central thicknesses of the first lens to the sixth lens along the optical axis and the total optical length TTL of the optical lens satisfy: 0.27 < ΣCT / TTL < 0.47. Meeting the above ranges can control the total optical length of the optical lens and the sum of the central thicknesses of each lens within a reasonable range, which helps to achieve high pixel characteristics and improve the imaging quality of the optical lens.

[0100] In some embodiments, the sum ΣCT of the central thicknesses of the first lens to the sixth lens along the optical axis and the effective focal length f of the optical lens satisfy: 1.29 < ΣCT / f < 2.47. Meeting the above ranges can control the effective focal length of the optical lens and the sum of the central thicknesses of each lens within a reasonable range, making the lens more compact.

[0101] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1 < f3 / f < 3.3. Meeting the above ranges can effectively correct the aberration generated at the front end of the lens by reasonably limiting the proportion of the optical power of the third lens, and improve the imaging quality of the lens. More specifically: 1.07 < f3 / f < 3.22.

[0102] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.8 < f4 / f < 3.1. Meeting the above ranges can effectively correct the aberration of the optical lens by reasonably limiting the proportion of the optical power of the fourth lens, and improve the imaging quality. More specifically: 0.84 < f4 / f < 3.08.

[0103] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.6 < f5 / f < -0.5. By satisfying the above range and reasonably defining the proportion of the optical power of the fifth lens, the spherical aberration can be optimized to achieve high-quality imaging. More specifically: -1.54 < f5 / f < -0.55.

[0104] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 1.1 < f6 / f < 7.3. By satisfying the above range and reasonably defining the proportion of the optical power of the sixth lens, it is beneficial for the convergence of light rays, enabling the light ray trend 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, and being beneficial for improving the illuminance of the peripheral field of view. More specifically: 1.12 < f6 / f < 7.26.

[0105] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 0.38 < R1 / R2 < 0.54. By satisfying the above range and controlling the first lens to have an appropriate surface shape, it can have a diverging effect on the light rays passing through it, which is beneficial for achieving a small front aperture.

[0106] In some embodiments, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 1.5 < R3 / R4 < 4.2. By satisfying the above range and controlling the second lens to have an appropriate surface shape, it can effectively correct the spherical aberration and improve the imaging quality. More specifically: 1.54 < R3 / R4 < 4.19.

[0107] In some embodiments, the optical lens satisfies the following conditional expressions: 6.5 mm < f < 8.7 mm; 60° < FOV < 69°; 4.2 mm < EPD < 5.5 mm; 36 mm < TTL < 39 mm; 1.5 < Fno < 1.7; 7.5 mm < IH < 8.9 mm; 12° < CRA < 18°; 4.8 mm < BFL < 14 mm. In the above conditional expressions, f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, Fno represents the aperture value of the optical lens, IH represents the true image height corresponding to the maximum field of view angle of the optical lens, CRA represents the principal ray incident angle at the maximum image height of the optical lens, and BFL represents the back focal length 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 low distortion. More specifically: 6.89 mm < f < 8.68 mm; 60.79° < FOV < 68.01°; 4.22 mm < EPD < 5.46 mm; 36.01 mm < TTL < 38.01 mm; 1.55 < Fno < 1.65; 7.55 mm < IH < 8.9 mm; 12.99° < CRA < 17.02°; 4.83 mm < BFL < 13.92 mm.

[0108] 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. Additionally, 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.

[0109] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens can adopt spherical lenses or aspherical lenses. Compared with the spherical lens 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 second lens and the sixth lens of the present invention adopt aspherical lenses, and the first lens, the third lens, the fourth lens, and the fifth lens adopt spherical lenses; or the third lens and the sixth lens adopt aspherical lenses, and the first lens, the second lens, the fourth lens, and the fifth lens adopt spherical lenses.

[0110] In each embodiment of the present invention, when the lens adopts an aspherical lens, the surface shapes of the aspherical surfaces of the optical lens satisfy the following equations:

[0111]

[0112] Among them, z is the distance between the surface and the vertex of the surface in the optical axis direction, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the conic coefficient, and B, C, D, E, and F are the conic coefficients of the fourth, sixth, eighth, tenth, and twelfth orders respectively.

[0113] The present invention will be further described below with multiple embodiments. In each embodiment, the thickness, curvature radius, and material selection of each lens in the optical lens are partially different. For specific differences, refer to the parameter tables of each embodiment. The following embodiments are only the preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following embodiments. Any 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.

[0114] Embodiment 1

[0115] Please refer to Figure 1 , which shows a schematic structural diagram of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens 100 sequentially includes, along the optical axis from the object side to the imaging surface: a first lens L1, a second lens L2, a third lens L3, a diaphragm ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter G1, and a protective glass G2.

[0116] Among them, the first lens L1 has a negative optical power. Its object side S1 is a concave surface, and its image side S2 is a convex surface;

[0117] The second lens L2 has a negative optical power. Its object side S3 is a convex surface near the optical axis, and its image side S4 is a concave surface;

[0118] The third lens L3 has a positive optical power. Its object side S5 is a convex surface, and its image side S6 is a concave surface;

[0119] The fourth lens L4 has a positive optical power. Its object side S7 is a convex surface, and its image side S8 is a convex surface;

[0120] The fifth lens L5 has a negative optical power. Its object side S8 is a concave surface, and its image side S9 is a concave surface;

[0121] The fourth lens L4 and the fifth lens L5 form a cemented lens group, that is, the cemented surface of the image side of the fourth lens L4 and the object side of the fifth lens L5 is S8;

[0122] The sixth lens L6 has a positive optical power. Its object side S10 is a convex surface near the optical axis, and its image side S11 is a concave surface near the optical axis;

[0123] The object side S12 and the image side S13 of the filter G1 are both flat surfaces;

[0124] The object side surface S14 and the image side surface S15 of the protective glass G2 are both flat surfaces;

[0125] The imaging surface S16 is a flat surface.

[0126] The second lens L2 and the sixth lens L6 are glass aspherical lenses, and the first lens L1, the third lens L3, the fourth lens L4, and the fifth lens L5 are glass spherical lenses.

[0127] The relevant parameters of each lens in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0128] Table 1-1

[0129]

[0130]

[0131] The surface type parameters of the aspherical lenses of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0132] Table 1-2

[0133] Face number K B C D E F S3 -1.22E+00 -2.51E-03 8.88E-05 -2.05E-06 2.76E-08 -1.62E-10 S4 -1.41E+00 -2.56E-03 1.25E-04 -3.51E-06 5.90E-08 -4.30E-10 S10 -4.37E+00 -7.14E-04 -2.35E-05 -9.03E-07 4.62E-08 -8.31E-10 S11 5.00E+01 -5.62E-04 -2.94E-05 1.32E-07 2.00E-08 -4.59E-10

[0134] In this embodiment, the F-Tan(Theta) distortion curve graph and the MTF curve graph of the optical lens 100 are respectively as Figure 2 , Figure 3 shown.

[0135] Figure 2 shows the F-Tan(Theta) distortion curve graph of Embodiment 1, which represents the distortion of light rays of different wavelengths at different image heights on the imaging surface. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field of view angle (unit: °). It can be seen from the figure that the distortion of the optical lens is controlled within -20% to 0%, indicating that the optical lens 100 can correct the distortion well.

[0136] Figure 3 shows the MTF (Modulation Transfer Function) curve graph of Embodiment 1, which represents the modulation degree of the lens imaging at different spatial frequencies in each field of view. The horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value in this embodiment is above 0.6 in the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve smoothly decreases uniformly from the center to the edge field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0137] Embodiment 2

[0138] Please refer to Figure 4, which shows a schematic structural diagram of the optical lens 200 provided in Embodiment 2 of the present invention. Compared with Embodiment 1, the main differences are as follows: the object side surface S5 of the third lens L3 is concave, and the image side surface S6 is convex; the image side surface S11 of the sixth lens L6 is convex; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0139] The relevant parameters of each lens in the optical lens 200 in Embodiment 2 are shown in Table 2-1.

[0140] Table 2-1

[0141]

[0142] The aspheric lens surface parameters of the optical lens 200 in Embodiment 2 are shown in Table 2-2.

[0143] Table 2-2

[0144]

[0145]

[0146] In this embodiment, the F-Tan(Theta) distortion curve graph and the MTF curve graph of the optical lens 200 are respectively as Figure 5 , Figure 6 shown. It can be seen from Figure 5 that the distortion of the optical lens 200 is controlled within -25% to 0%, indicating that the optical lens 200 can correct the distortion well. It can be seen from Figure 6 that the MTF value of this embodiment is above 0.5 within the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve smoothly decreases uniformly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0147] Embodiment 3

[0148] Please refer to Figure 7 , which shows a schematic structural diagram of the optical lens 300 provided in Embodiment 3 of the present invention. Compared with Embodiment 1, the main differences are as follows: the image side surface S6 of the third lens L3 is convex; the image side surface S11 of the sixth lens L6 is convex; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0149] The relevant parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3-1.

[0150] Table 3-1

[0151]

[0152] The surface shape parameters of the aspherical lens of the optical lens 300 in Embodiment 3 are shown in Table 3-2.

[0153] Table 3-2

[0154] Face number K B C D E F S3 2.29E+00 -4.03E-03 1.68E-04 -5.18E-06 9.31E-08 -7.57E-10 S4 -3.44E+00 -1.61E-03 1.19E-04 -4.42E-06 9.26E-08 -8.27E-10 S10 -1.04E+00 -1.79E-04 -1.95E-07 -2.28E-07 7.72E-09 -1.66E-10 S11 5.60E+00 6.96E-05 -1.97E-06 1.67E-08 -8.59E-10 -7.03E-12

[0155] In this embodiment, the F-Tan(Theta) distortion curve graph and MTF curve graph of the optical lens 300 are respectively as shown in Figure 8 , Figure 9 shown. It can be seen from Figure 8 that the distortion of the optical lens 300 is controlled within -25% to 0%, indicating that the optical lens 300 can correct the distortion well. It can be seen from Figure 9 that the MTF value of this embodiment is above 0.5 within the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve smoothly decreases uniformly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0156] Embodiment 4

[0157] Please refer to Figure 10 , which shows the structural schematic diagram of the optical lens 400 provided in Embodiment 4 of the present invention. Compared with Embodiment 1, the main differences are as follows: The image side S6 of the third lens L3 is a convex surface; the image side S8 of the fourth lens L4 is a concave surface; the object side S8 of the fifth lens L5 is a convex surface; the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0158] The relevant parameters of each lens in the optical lens 400 in Embodiment 4 are shown in Table 4-1.

[0159] Table 4-1

[0160]

[0161]

[0162] The surface shape parameters of the aspherical lens of the optical lens 400 in Embodiment 4 are shown in Table 4-2.

[0163] Table 4-2

[0164] Face number K B C D E F S3 -4.14E+00 -2.51E-03 9.36E-05 -2.19E-06 2.96E-08 -1.74E-10 S4 -1.30E+00 -2.79E-03 1.29E-04 -3.46E-06 5.63E-08 -4.06E-10 S10 4.55E-01 -3.26E-05 9.26E-07 -4.00E-08 -3.68E-09 1.64E-10 S11 1.32E+01 4.82E-04 5.47E-06 7.81E-07 -6.29E-08 2.35E-09

[0165] In this embodiment, the F-Tan(Theta) distortion curve graph and MTF curve graph of the optical lens 400 are respectively as shown in Figure 11 , Figure 12 shown. It can be seen from Figure 11It can be seen that the distortion of the optical lens 400 is controlled within -20% to 0%, indicating that the optical lens 400 can correct the distortion well. From Figure 12 It can be seen that the MTF value of this embodiment is above 0.5 within the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases uniformly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0166] Example 5

[0167] Please refer to Figure 13 , which shows the structural schematic diagram of the optical lens 500 provided in Embodiment 5 of the present invention. Compared with Embodiment 1, the main difference is that: the image side S9 of the fifth lens L5 is a convex surface; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0168] The relevant parameters of each lens in the optical lens 500 in Embodiment 5 are shown in Table 5-1.

[0169] Table 5-1

[0170]

[0171]

[0172] The aspherical lens surface type parameters of the optical lens 500 in Embodiment 5 are shown in Table 5-2.

[0173] Table 5-2

[0174] Face number K B C D E F S3 -1.18E+00 -2.34E-03 7.94E-05 -1.83E-06 2.62E-08 -1.68E-10 S4 -2.35E+00 -1.25E-03 8.25E-05 -2.58E-06 4.99E-08 -4.28E-10 S10 2.14E+00 -7.85E-04 -2.33E-05 -6.60E-07 3.94E-08 -6.21E-10 S11 1.60E+01 -6.88E-04 -3.17E-05 -6.39E-08 2.78E-08 -5.91E-10

[0175] In this embodiment, the F-Tan(Theta) distortion curve graph and MTF curve graph of the optical lens 500 are respectively as shown in Figure 14 , Figure 15 shown. From Figure 14 it can be seen that the distortion of the optical lens 500 is controlled within -20% to 0%, indicating that the optical lens 500 can correct the distortion well. From Figure 15 it can be seen that the MTF value of this embodiment is above 0.6 within the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases uniformly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0176] Example 6

[0177] Please refer to Figure 16, which shows the structural schematic diagram of the optical lens 600 provided in Embodiment 6 of the present invention. Compared with Embodiment 1, the main difference is that 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 600 in Embodiment 6 are shown in Table 6-1.

[0179] Table 6-1

[0180]

[0181]

[0182] The surface type parameters of the aspherical lens in the optical lens 600 in Embodiment 6 are shown in Table 6-2.

[0183] Table 6-2

[0184] Face number K B C D E F S3 -1.27E+00 -1.64E-03 4.91E-05 -9.33E-07 1.04E-08 -5.12E-11 S4 -6.82E-01 -2.09E-03 6.45E-05 -1.38E-06 1.75E-08 -9.55E-11 S10 -7.45E+00 -8.02E-04 -2.27E-05 -3.75E-08 1.12E-08 -3.48E-10 S11 2.85E+01 -4.55E-04 -2.50E-05 1.38E-06 -3.96E-08 4.12E-10

[0185] In this embodiment, the F-Tan(Theta) distortion curve graph and MTF curve graph of the optical lens 600 are respectively as Figure 17 , Figure 18 shown. It can be seen from Figure 17 that the distortion of the optical lens 600 is controlled within -20% to 0%, indicating that the optical lens 600 can correct the distortion well. It can be seen from Figure 18 that the MTF value of this embodiment is above 0.6 within the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve smoothly decreases uniformly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0186] Embodiment 7

[0187] Please refer to Figure 19 , which shows the structural schematic diagram of the optical lens 700 provided in Embodiment 7 of the present invention. Compared with Embodiment 1, the main differences are that: the image side surface S8 of the fourth lens L4 is concave; the object side surface S8 of the fifth lens L5 is convex; the image side surface S11 of the sixth lens L6 is convex near the optical axis; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0188] The relevant parameters of each lens in the optical lens 700 in Embodiment 7 are shown in Table 7-1.

[0189] Table 7-1

[0190]

[0191]

[0192] The surface shape parameters of the aspherical lens of the optical lens 700 in Embodiment 7 are shown in Table 7-2.

[0193] Table 7-2

[0194] Face number K B C D E F S3 1.08E+00 -3.18E-03 9.43E-05 -2.05E-06 2.61E-08 -1.60E-10 S4 -2.58E+00 -1.62E-03 8.29E-05 -2.16E-06 3.37E-08 -2.38E-10 S10 -7.74E-01 2.36E-04 2.49E-06 7.97E-07 -3.08E-08 1.06E-09 S11 3.97E+01 8.05E-04 -2.21E-05 5.09E-06 -3.07E-07 9.29E-09

[0195] In this embodiment, the F-Tan(Theta) distortion curve graph and the MTF curve graph of the optical lens 700 are respectively as Figure 20 , Figure 21 shown. It can be seen from Figure 20 that the distortion of the optical lens 700 is controlled within -25% to 0%, indicating that the optical lens 700 can correct distortion well. It can be seen from Figure 21 that the MTF value of this embodiment is above 0.5 within the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve smoothly decreases uniformly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0196] Embodiment 8

[0197] Please refer to Figure 22 , which shows the structural schematic diagram of the optical lens 800 provided in Embodiment 8 of the present invention. Compared with Embodiment 1, the main differences are: the image side S9 of the fifth lens L5 is a convex surface; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0198] The relevant parameters of each lens in the optical lens 800 in Embodiment 8 are shown in Table 8-1.

[0199] Table 8-1

[0200]

[0201] The surface shape parameters of the aspherical lens of the optical lens 800 in Embodiment 8 are shown in Table 8-2.

[0202] Table 8-2

[0203] Face number K B C D E F S3 -1.08E+00 -2.17E-03 5.49E-05 -9.69E-07 1.04E-08 -5.01E-11 S4 -9.38E-01 -2.82E-03 9.96E-05 -2.45E-06 3.96E-08 -2.89E-10 S10 -4.04E+01 -7.84E-04 -3.34E-05 -6.67E-07 5.88E-08 -1.60E-09 S11 4.47E+01 -8.39E-04 -3.54E-05 5.40E-07 6.67E-09 -4.43E-10

[0204] In this embodiment, the F-Tan(Theta) distortion curve graph and the MTF curve graph of the optical lens 800 are respectively as Figure 23 , Figure 24 shown. It can be seen from Figure 23 that the distortion of the optical lens 800 is controlled within -20% to 0%, indicating that the optical lens 800 can correct distortion well. From Figure 24It can be seen that 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 uniformly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0205] Embodiment 9

[0206] Please refer to Figure 25 , which shows the structural schematic diagram of the optical lens 900 provided in Embodiment 9 of the present invention. Compared with Embodiment 1, the main differences are as follows: The object side S5 of the third lens L3 is concave, and the image side S6 is convex; the image side S8 of the fourth lens L4 is concave; the object side S8 of the fifth lens L5 is convex; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0207] The relevant parameters of each lens in the optical lens 900 in Embodiment 9 are shown in Table 9-1.

[0208] Table 9-1

[0209]

[0210] The surface type parameters of the aspherical lenses in the optical lens 900 in Embodiment 9 are shown in Table 9-2.

[0211] Table 9-2

[0212]

[0213]

[0214] In this embodiment, the F-Tan(Theta) distortion curve graph and the MTF curve graph of the optical lens 900 are respectively as shown in Figure 26 , Figure 27 shown. It can be seen from Figure 26 that the distortion of the optical lens 900 is controlled within -25% to 0%, indicating that the optical lens 900 can correct distortion well. It can be seen from Figure 27 that 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 uniformly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0215] Embodiment 10

[0216] Please refer to Figure 28, as shown in the structural schematic diagram of the optical lens 1000 provided in Embodiment 10 of the present invention. Compared with Embodiment 1, the main differences are as follows: the object side surface S5 of the third lens L3 is concave, and the image side surface S6 is convex; the image side surface S11 of the sixth lens L6 is convex; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0217] The relevant parameters of each lens in the optical lens 1000 in Embodiment 10 are shown in Table 10-1.

[0218] Table 10-1

[0219]

[0220] The surface type parameters of the aspherical lenses in the optical lens 1000 in Embodiment 10 are shown in Table 10-2.

[0221] Table 10-2

[0222] Face number K B C D E F S3 -6.10E-01 -4.12E-03 8.50E-05 -9.31E-07 -9.30E-09 2.38E-10 S4 -1.32E+00 -3.95E-03 1.67E-04 -4.23E-06 5.31E-08 -2.11E-10 S10 1.53E+00 -3.61E-04 -1.32E-08 -3.61E-07 1.25E-08 -2.67E-10 S11 1.26E+00 1.29E-04 3.14E-06 -2.03E-07 8.77E-09 -1.59E-10

[0223] In this embodiment, the F-Tan(Theta) distortion curve graph and the MTF curve graph of the optical lens 1000 are respectively as Figure 29 , Figure 30 shown. It can be seen from Figure 29 that the distortion of the optical lens 1000 is controlled within -25% to 0%, indicating that the optical lens 1000 can correct the distortion well. It can be seen from Figure 30 that the MTF value of this embodiment is above 0.6 within the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases uniformly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0224] Embodiment 11

[0225] Please refer to Figure 31 , as shown in the structural schematic diagram of the optical lens 1100 provided in Embodiment 11 of the present invention. Compared with Embodiment 1, the main differences are as follows: the object side surface S5 of the third lens L3 is concave, and the image side surface S6 is convex; the object side surface S10 of the sixth lens L6 is concave; the image side surface S11 is convex; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0226] The relevant parameters of each lens in the optical lens 1100 in Embodiment 11 are shown in Table 11-1.

[0227] Table 11-1

[0228]

[0229]

[0230] The surface shape parameters of the aspherical lens of the optical lens 1100 in Embodiment 11 are shown in Table 11-2.

[0231] Table 11-2

[0232] Face number K B C D E F S3 -4.22E-01 -1.14E-03 -3.36E-05 7.76E-07 -7.16E-09 -1.21E-11 S4 -8.24E-01 -1.52E-03 -9.78E-05 4.53E-06 -1.00E-07 8.11E-10 S10 4.89E+01 -4.96E-04 3.19E-06 -1.61E-06 8.21E-08 -2.53E-09 S11 1.47E+00 9.10E-05 -3.50E-07 4.48E-08 -2.69E-09 -9.27E-11

[0233] In this embodiment, the F-Tan(Theta) distortion curve graph and the MTF curve graph of the optical lens 1100 are respectively as Figure 32 , Figure 33 shown. It can be seen from Figure 32 that the distortion of the optical lens 1100 is controlled within -25% to 0%, indicating that the optical lens 1100 can correct the distortion well. It can be seen from Figure 33 that the MTF value of this embodiment is above 0.5 within the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve smoothly decreases uniformly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0234] Embodiment 12

[0235] Please refer to Figure 34 , which shows the structural schematic diagram of the optical lens 1200 provided in Embodiment 12 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image side S9 of the fifth lens L5 is a convex surface; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0236] The relevant parameters of each lens in the optical lens 1200 in Embodiment 12 are shown in Table 12-1.

[0237] Table 12-1

[0238]

[0239]

[0240] The surface shape parameters of the aspherical lens of the optical lens 1200 in Embodiment 12 are shown in Table 12-2.

[0241] Table 12-2

[0242] Face number K B C D E F S3 -2.80E+00 -2.16E-03 7.33E-05 -1.64E-06 2.25E-08 -1.43E-10 S4 -1.18E+00 -2.77E-03 1.26E-04 -3.66E-06 6.95E-08 -6.06E-10 S10 3.27E+00 -2.92E-04 -4.24E-06 -2.68E-07 1.03E-08 -2.00E-10 S11 1.99E+01 -1.95E-04 -1.02E-05 -2.34E-07 1.30E-08 -2.80E-10

[0243] In this embodiment, the F-Tan(Theta) distortion curve graph and the MTF curve graph of the optical lens 1200 are respectively as Figure 35 , Figure 36 shown. FromFigure 35 It can be seen that the distortion of the optical lens 1200 is controlled within -20% to 0%, indicating that the optical lens 1200 can correct the distortion well. From Figure 36 It can be seen that the MTF value of this embodiment is above 0.6 within the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases uniformly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0244] Embodiment 13

[0245] Please refer to Figure 37 , which shows the structural schematic diagram of the optical lens 1300 provided in Embodiment 13 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image side S6 of the third lens L3 is a convex surface; the image side S9 of the fifth lens L5 is a convex surface; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0246] The relevant parameters of each lens in the optical lens 1300 in Embodiment 13 are shown in Table 13-1.

[0247] Table 13-1

[0248]

[0249]

[0250] The aspheric lens surface type parameters of the optical lens 1300 in Embodiment 13 are shown in Table 13-2.

[0251] Table 13-2

[0252] Face number K B C D E F S3 -3.92E-01 -9.20E-04 -4.24E-06 2.76E-07 -4.41E-09 2.26E-11 S4 -6.94E-01 -1.43E-03 -1.37E-05 7.19E-07 -1.50E-08 1.21E-11 S10 1.71E+00 -2.95E-04 -7.12E-06 -9.13E-07 3.31E-08 -9.32E-10 S11 3.99E+00 3.73E-04 -1.25E-05 -2.11E-06 9.58E-08 -3.92E-09

[0253] In this embodiment, the F-Tan(Theta) distortion curve graph and MTF curve graph of the optical lens 1300 are respectively as Figure 38 , Figure 39 shown. From Figure 38 it can be seen that the distortion of the optical lens 1300 is controlled within -20% to 0%, indicating that the optical lens 1300 can correct the distortion well. From Figure 39 it can be seen that the MTF value of this embodiment is above 0.6 within the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases uniformly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0254] Embodiment 14

[0255] Please refer to Figure 40, which shows the structural schematic diagram of the optical lens 1400 provided in Embodiment 14 of the present invention. Compared with Embodiment 1, the main differences are as follows: The image side S6 of the third lens L3 is a convex surface; the image side S9 of the fifth lens L5 is a convex surface; the object side S10 of the sixth lens L6 is a concave surface; the image side S11 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0256] The relevant parameters of each lens in the optical lens 1400 in Embodiment 14 are shown in Table 14-1.

[0257] Table 14-1

[0258]

[0259] The aspheric lens surface type parameters of the optical lens 1400 in Embodiment 14 are shown in Table 14-2.

[0260] Table 14-2

[0261] Face number K B C D E F S3 -2.53E-02 -5.03E-04 -7.38E-06 -4.78E-08 2.44E-09 -3.38E-11 S4 -5.84E-01 -1.08E-03 -4.14E-05 -7.40E-08 2.58E-08 -1.18E-09 S10 5.00E+01 -6.57E-04 -1.27E-05 -8.03E-07 4.39E-08 -1.12E-09 S11 1.51E+00 -3.23E-04 -1.31E-05 -2.41E-07 1.78E-08 -4.84E-10

[0262] In this embodiment, the F-Tan(Theta) distortion curve graph and MTF curve graph of the optical lens 1400 are respectively as Figure 41 , Figure 42 shown. It can be seen from Figure 41 that the distortion of the optical lens 1400 is controlled within -20% to 0%, indicating that the optical lens 1400 can correct the distortion well. It can be seen from Figure 42 that the MTF value of this embodiment is above 0.7 within the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve smoothly decreases uniformly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0263] Embodiment 15

[0264] Please refer to Figure 43 , which shows the structural schematic diagram of the optical lens 1500 provided in Embodiment 15 of the present invention. Compared with Embodiment 1, the main differences are as follows: The image side S6 of the third lens L3 is a convex surface; the image side S9 of the fifth lens L5 is a convex surface; the image side S11 of the sixth lens L6 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0265] The relevant parameters of each lens in the optical lens 1500 in Embodiment 15 are shown in Table 15-1.

[0266] Table 15-1

[0267]

[0268] The surface type parameters of the aspherical lens of the optical lens 1500 in Embodiment 15 are shown in Table 15-2.

[0269] Table 15-2

[0270] Face number K B C D E F S3 -2.78E-01 -6.37E-04 -1.22E-05 1.37E-07 4.11E-10 -2.09E-11 S4 -8.88E-01 -6.76E-04 -4.14E-05 1.64E-06 -2.63E-08 1.62E-10 S10 3.67E+00 -1.94E-04 -1.80E-06 -3.68E-07 1.47E-08 -2.63E-10 S11 -4.91E+01 -8.10E-05 -3.88E-06 -1.95E-07 9.12E-09 -1.70E-10

[0271] In this embodiment, the F-Tan(Theta) distortion curve graph and the MTF curve graph of the optical lens 1500 are respectively as Figure 44 、 Figure 45 shown. It can be seen from Figure 44 that the distortion of the optical lens 1500 is controlled within -25% to 0%, indicating that the optical lens 1500 can correct the distortion well. It can be seen from Figure 45 that the MTF value of this embodiment is above 0.6 within the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve smoothly decreases uniformly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0272] Embodiment 16

[0273] Please refer to Figure 46 , which shows the structural schematic diagram of the optical lens 1600 provided in Embodiment 16 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the aperture stop ST is located between the second lens L2 and the third lens L3; the image side surface S6 of the third lens L3 is a convex surface; the object side surface S7 of the fourth lens L4 is a concave surface; the third lens L3 and the sixth lens L6 adopt glass aspherical lenses, and the first lens L1, the second lens L2, the fourth lens L4, and the fifth lens L5 adopt glass spherical lenses; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0274] The relevant parameters of each lens in the optical lens 1600 in Embodiment 16 are shown in Table 16-1.

[0275] Table 16-1

[0276]

[0277] The surface type parameters of the aspherical lens of the optical lens 1600 in Embodiment 16 are shown in Table 16-2.

[0278] Table 16-2

[0279] Face number K B C D E F S5 -2.14E-01 -1.07E-04 -9.07E-07 -3.32E-08 1.03E-09 -1.99E-11 S6 -6.04E+00 -1.41E-04 4.46E-06 -1.30E-07 2.37E-09 -2.66E-11 S10 3.68E-01 1.58E-04 -3.23E-05 -1.68E-06 9.02E-08 -4.22E-09 S11 2.86E+01 6.22E-04 -2.22E-05 2.45E-07 -1.14E-07 1.30E-09

[0280] In this embodiment, the F-Tan(Theta) distortion curve graph and the MTF curve graph of the optical lens 1600 are respectively asFigure 47 , Figure 48 as shown. From Figure 47 it can be seen that the distortion of the optical lens 1600 is controlled within -15% to 0%, indicating that the optical lens 1600 can correct the distortion well. From Figure 48 it can be seen that the MTF value of this embodiment is above 0.6 within the entire field of view, and within the range of 0 to 120 lp / mm, the MTF curve decreases uniformly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0281] Embodiment 17

[0282] Please refer to Figure 49 , which shows the structural schematic diagram of the optical lens 1700 provided in Embodiment 17 of the present invention. Compared with Embodiment 1, the main differences are as follows: The aperture stop ST is located between the second lens L2 and the third lens L3; the image side S6 of the third lens L3 is a convex surface; the object side S7 of the fourth lens L4 is a concave surface; the object side S10 of the sixth lens L6 is a concave surface near the optical axis; the image side S11 is a convex surface near the optical axis; the third lens L3 and the sixth lens L6 are made of glass aspherical lenses, and the first lens L1, the second lens L2, the fourth lens L4, and the fifth lens L5 are made of glass spherical lenses; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0283] The relevant parameters of each lens in the optical lens 1700 in Embodiment 17 are shown in Table 17-1.

[0284] Table 17-1

[0285]

[0286]

[0287] The surface type parameters of the aspherical lenses in the optical lens 1700 in Embodiment 17 are shown in Table 17-2.

[0288] Table 17-2

[0289] Face number K B C D E F S5 -3.48E-01 -1.40E-04 2.80E-06 -2.83E-07 1.16E-08 -2.14E-10 S6 -4.25E+00 3.19E-04 -8.29E-06 1.30E-07 1.36E-09 -9.40E-11 S10 -1.91E+01 2.88E-03 -1.71E-04 -4.95E-06 3.86E-07 -2.56E-08 S11 7.49E+00 3.15E-03 -1.79E-04 4.43E-06 -4.92E-07 1.56E-08

[0290] In this embodiment, the F-Tan(Theta) distortion curve graph and the MTF curve graph of the optical lens 1700 are respectively as shown in Figure 50 , Figure 51 as shown. From Figure 50 it can be seen that the distortion of the optical lens 1700 is controlled within -15% to 0%, indicating that the optical lens 1700 can correct the distortion well. From Figure 51It can be seen that the MTF value of this embodiment is above 0.4 within the entire field of view. In the range of 0 - 120 lp / mm, the MTF curve smoothly decreases uniformly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0291] Please refer to Table 18 - 1 and Table 18 - 2 for the optical characteristics corresponding to the above embodiments, including the effective focal length f of the optical lens, the total optical length TTL, the aperture value Fno, the chief ray angle of incidence CRA at the maximum image height, the true image height IH corresponding to the maximum field of view angle, the maximum field of view angle FOV, the entrance pupil diameter EPD, the back focal length BFL, and the values corresponding to each conditional formula in each embodiment.

[0292] Table 18 - 1

[0293]

[0294]

[0295] Table 18 - 2

[0296]

[0297]

[0298] In summary of the above embodiments, the optical lens provided by the present invention adopts six lenses with specific optical powers. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberration, and enhance 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 small distortion.

[0299] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0300] The above - described embodiments only represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims

1. An optical lens, consisting of six lenses in total, characterized in that, It sequentially includes from the object side to the imaging surface along the optical axis: A first lens with a negative optical power, whose object side is concave and whose image side is convex; A second lens with a negative optical power, whose object side is convex near the optical axis and whose image side is concave; A third lens with a positive optical power; A fourth lens with a positive optical power; A fifth lens with a negative optical power; A sixth lens with a positive optical power; Wherein, 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: 0.2 < (R3 - R4) / (R3 + R4) < 0.

62.

2. The optical lens according to claim 1, characterized in that, The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.3 < TTL / f < 5.6; the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 4.2 < TTL / IH < 5.

1.

3. The optical lens according to claim 1, characterized in that, The maximum field of view angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 37° < FOV / Fno < 44°; the true image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1.4 < IH / EPD < 1.

8.

4. The optical lens according to claim 1, characterized in that, The true image height IH corresponding to the maximum field of view angle of the optical lens and the effective focal length f of the optical lens satisfy: 0.9 < IH / f < 1.15; the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.65 < BFL / f < 1.

8.

5. The optical lens according to claim 1, characterized in that, The clear aperture radius d1 of the object side of the first lens, the true image height IH corresponding to the maximum field of view angle of the optical lens and the maximum field of view angle FOV of the optical lens satisfy: 2 < d1 / (IH / 2) / tan(FOV / 2) < 3.3; the optical lens further includes a diaphragm located between the second lens and the third lens or between the third lens and the fourth lens, and the combined focal length f behind of all the lenses after the diaphragm and the effective focal length f of the optical lens satisfy: 1.2 < f behind / f < 3.

7.

6. The optical lens according to claim 1, wherein The focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -13.4 < f1 / f < -5.1; the curvature radius R1 of the object side of the first lens and the effective focal length f of the optical lens satisfy: -4.1 < R1 / f < -2.3; the curvature radius R2 of the image side of the first lens and the effective focal length f of the optical lens satisfy: -8.2 < R2 / f < -5.

9.

7. The optical lens according to claim 1, wherein The focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -3.2 < f2 / f < -1; the curvature radius R3 of the object side of the second lens and the effective focal length f of the optical lens satisfy: 0.55 < R3 / f < 4.6; the curvature radius R4 of the image side of the second lens and the effective focal length f of the optical lens satisfy: 0.35 < R4 / f < 1.

1.

8. The optical lens according to claim 1, 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: -0.45 < (R1 - R2) / (R1 + R2) < -0.

29.

9. The optical lens according to claim 1, characterized in that The sagittal height Sag1 of the light-passing semi-aperture on the object side of the first lens and the light-passing semi-aperture d1 on the object side of the first lens satisfy: -0.2 < Sag1 / d1 < -0.12; the sagittal height Sag2 of the light-passing semi-aperture on the image side of the first lens and the light-passing semi-aperture d2 on the image side of the first lens satisfy: -0.08 < Sag2 / d2 < -0.

04.

10. The optical lens according to claim 1, wherein The radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the image side of the first lens and the central thickness CT1 of the first lens satisfy: 0.39 < (R1 - CT1) / R2 < 0.56; the radius of curvature R3 of the object side of the second lens, the radius of curvature R4 of the image side of the second lens and the central thickness CT2 of the second lens satisfy: 1 < (R3 - CT2) / R4 < 2.6.

Images