Optical lens

Abstract

The application provides an optical lens, which comprises six lenses in sequence along an optical axis from an object side to an imaging surface, and the six lenses comprise: a first lens with negative optical power, wherein the object side of the first lens is a concave surface, and the image side of the first lens is a convex surface; a second lens with negative optical power, wherein the object side of the second lens is a convex surface at a near optical axis, and the image side of the second lens is a concave surface; a third lens with positive optical power; a fourth lens with positive optical power; a fifth lens with negative optical power; and a sixth lens with 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. The optical lens provided by the application has one or more advantages such as a large target surface, a large aperture, small distortion and the like.

Description

Technical Field

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

[0002] In today's booming development of automotive driver assistance and autonomous driving technologies, in-vehicle cameras play a crucial role. There are various types of in-vehicle cameras, including interior, rear, front, side, and surround view cameras. Each has unique functions and different application scenarios. For example, the main function of a front-view wide-angle camera is to accurately identify nearby objects, providing crucial information for driving in urban road conditions and low-speed driving scenarios.

[0003] The forward-facing camera is a core component of ADAS (Advanced Driver Assistance Systems). It not only bears the crucial responsibility of distance measurement but also accurately identifies objects and clearly distinguishes road markings. Therefore, the required visual algorithms are extremely complex, posing a high technical barrier. To fully utilize the performance of the forward-facing camera, developing an optical lens with superior imaging capabilities is of paramount importance. Only in this way can we ensure its stable and efficient operation in complex driving environments, laying a solid foundation for the further development of autonomous driving technology. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide an optical lens with the advantage of excellent image quality.

[0005] The technical solution adopted in this invention is as follows:

[0006] An optical lens comprising six lenses, arranged sequentially along the optical axis from the object side to the imaging plane:

[0007] The first lens with negative optical power has a concave object side and a convex image side.

[0008] The second lens with negative optical power has an object-side surface that is convex near the optical axis and an image-side surface that 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 object-side radius of curvature R3 of the second lens and the image-side radius of curvature R4 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 angle of the optical lens satisfy: 4.2 < TTL / IH < 5.1.

[0015] Further preferably, the maximum field 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 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 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 angle of the optical lens and the maximum field angle FOV of the optical lens satisfy: 2 < d1 / (IH / 2) / tan(FOV / 2) < 3.3; the optical lens further includes an aperture 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 aperture 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] More 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] More preferably, the sagittal height Sag1 of the clear aperture semi-diameter of the object side surface of the first lens and the clear aperture semi-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 semi-diameter of the image side surface of the first lens and the clear aperture semi-diameter d2 of the image side surface of the first lens satisfy: -0.08 < Sag2 / d2 < -0.04.

[0022] More 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 adopts six lenses with specific optical powers. Through specific surface shape combinations and reasonable optical power distributions, it can improve the imaging quality of the optical lens, reduce aberrations, improve the imaging quality of the optical lens, and endow the lens with one or more advantages such as a large target surface, a large aperture, and small distortion. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0046] Figure 22This is a schematic diagram of the optical lens in Embodiment 8 of the present invention.

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

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

[0049] Figure 25 This is a schematic diagram of the optical lens structure in Embodiment 9 of the present invention.

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

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

[0052] Figure 28 This is a schematic diagram of the optical lens in Embodiment 10 of the present invention.

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

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

[0055] Figure 31 This is a schematic diagram of the optical lens structure in Embodiment 11 of the present invention.

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

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

[0058] Figure 34 This is a schematic diagram of the optical lens structure in Embodiment 12 of the present invention.

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

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

[0061] Figure 37 This is a schematic diagram of the optical lens structure in Embodiment 13 of the present invention.

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

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

[0064] Figure 40 This is a schematic diagram of the optical lens structure in Embodiment 14 of the present invention.

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

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

[0067] Figure 43 This is a schematic diagram of the optical lens structure in Embodiment 15 of the present invention.

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

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

[0070] Figure 46 This is a schematic diagram of the optical lens structure in Embodiment 16 of the present invention.

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

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

[0073] Figure 49 This is a schematic diagram of the optical lens structure in Embodiment 17 of the present invention.

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

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

[0076] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0077] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

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

[0079] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0080] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0081] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

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

[0083] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0084] The optical lens provided in this embodiment of the invention includes six lenses, which are arranged sequentially from the object side to the imaging plane along the optical axis as 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 negative optical power, its object-side surface may be concave, and its image-side surface may be convex. The second lens may have negative optical power, its object-side surface may be convex near the optical axis, and its image-side surface may be concave. The third lens may have positive optical power, its object-side surface may be convex or concave, and its image-side surface may be concave or convex. The fourth lens may have positive optical power, its object-side surface may be convex or concave, and its image-side surface may be convex or concave. The fifth lens may have negative optical power, its object-side surface may be concave or convex, and its image-side surface may be concave or convex. The sixth lens may have positive optical power, its object-side surface may be convex or concave near the optical axis, and its image-side surface may be concave or convex near the optical axis.

[0086] In some embodiments, the optical lens may also include an aperture stop, which may be located between the third and fourth lenses or between the second and third lenses. It is understood that the aperture stop is used to limit the amount of light entering the lens 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 disposed between the sixth lens and the imaging plane along the optical axis. The filter is used to filter out interfering light, preventing it from reaching the imaging plane of the optical lens and affecting normal imaging. The protective glass protects the optical lens, preventing damage to the image sensor, and improves the lens's shock and scratch resistance, while having almost no impact on the image quality of the optical lens.

[0088] In some embodiments, the fourth and fifth lenses can be cemented together to form a cemented lens, which can effectively correct chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberrations 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 object-side radius of curvature R3 and the image-side radius of curvature R4 of the second lens satisfy the following condition: 0.2 < (R3 - R4) / (R3 + R4) < 0.62. Meeting this range ensures that the second lens has an appropriate surface shape, effectively correcting aberrations and spherical aberrations, and improving image 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 angle of the optical lens satisfy: 4.2 < TTL / IH < 5.1. Meeting the above ranges is conducive to achieving a balance between a small volume and a 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 angle FOV of the optical lens and the f-number Fno of the optical lens satisfy: 37° < FOV / Fno < 44°; 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: 1.4 < IH / EPD < 1.8. Meeting the above ranges reasonably limits the ratio of the field angle to the f-number, enables collection of light at large angles and obtains 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 and the central field 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 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 facilitates reasonable arrangement of the positions of each lens and reduces 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 angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 2 < d1 / (IH / 2) / tan(FOV / 2) < 3.3; the optical lens further includes an aperture 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 aperture 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 radius of curvature 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 radius of curvature 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. 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 radius of curvature 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 radius of curvature 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. 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 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. 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 on the object side of the first lens and the clear aperture diameter d1 of the object side of the first lens satisfy: -0.2 < Sag1 / d1 < -0.12; the sagittal height Sag2 of the clear aperture on the image side of the first lens and the clear aperture diameter d2 of the image side 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 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. Meeting the above ranges controls the first lens and the second lens to have appropriate surface profiles and shapes, reduces the difficulty of correcting the distortion in the marginal field of view, controls the distortion within a reasonable range, and is beneficial to improving the yield of manufacturing the lens. 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 controls 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 controls 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, improving 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, improving 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. Meeting the above range and reasonably limiting the proportion of the optical power of the fifth lens can optimize spherical aberration and 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. Meeting the above range and reasonably limiting the proportion of the optical power of the sixth lens is beneficial to the convergence of light rays, enables the light ray trend to smoothly transition to the rear, reduces the height of the light rays incident on the rear, slows down the upward trend of the light rays, and is beneficial to improving the illuminance of the edge field of view. More specifically: 1.12 < f6 / f < 7.26.

[0105] 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: 0.38 < R1 / R2 < 0.54. Meeting the above range and controlling the first lens to have an appropriate surface shape can have a diverging effect on the light rays passing through it, which is beneficial to achieving a small front aperture.

[0106] 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: 1.5 < R3 / R4 < 4.2. Meeting the above range and controlling the second lens to have an appropriate surface shape can effectively correct spherical aberration and improve 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 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. Additionally, when the lens material is glass, due to the low dispersion characteristic of the glass itself, the geometric chromatic aberration of the optical system can be effectively corrected. 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 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 equation:

[0111]

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

[0113] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0114] Example 1

[0115] Please see Figure 1 The diagram shows a schematic of the structure of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging surface, the following components in sequence: 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 filter G1, and a protective glass G2.

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

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

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

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

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

[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 positive optical power, its object side S10 is convex near the optical axis, and its image side S11 is concave near the optical axis.

[0123] The object-side surface S12 and the image-side surface S13 of the filter G1 are both planar.

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

[0125] The imaging plane S16 is a plane.

[0126] The second lens L2 and the sixth lens L6 are glass aspherical lenses, while 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 Example 1 are shown in Table 1-1.

[0128] Table 1-1

[0129]

[0130]

[0131] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 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 and MTF curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 As shown.

[0135] Figure 2 The F-Tan (Theta) distortion curve of Example 1 is shown, which represents 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 of view (unit: °). As can be seen from the figure, the distortion of the optical lens is controlled within -20% to 0%, indicating that the optical lens 100 can effectively correct distortion.

[0136] Figure 3 The MTF (Modulation Transfer Function) curve of Example 1 is shown, which represents the lens imaging modulation at different spatial frequencies in various fields of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents MTF value. As can be seen from the figure, the MTF value of this example is above 0.6 throughout the entire field of view. Within the range of 0–120 lp / mm, the MTF curve decreases smoothly and uniformly from the center to the edge of the field of view, exhibiting good imaging quality and good detail resolution at both low and high frequencies.

[0137] Example 2

[0138] Please see Figure 4The figure shows a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side S5 of the third lens L3 is concave and the image side S6 is convex; the image side S11 of the sixth lens L6 is convex; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

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

[0140] Table 2-1

[0141]

[0142] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0143] Table 2-2

[0144]

[0145]

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

[0147] Example 3

[0148] Please see Figure 7 The figure shows a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image-side surface S6 of the third lens L3 is a convex surface; the image-side surface S11 of the sixth lens L6 is a convex surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

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

[0150] Table 3-1

[0151]

[0152] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 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 and MTF curve of the optical lens 300 are respectively as follows: Figure 8 , Figure 9 As shown. From Figure 8 As can be seen, the distortion of optical lens 300 is controlled within -25% to 0%, indicating that optical lens 300 can effectively correct distortion. From Figure 9 As can be seen, the MTF value of this embodiment is above 0.5 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0156] Example 4

[0157] Please see Figure 10 The figure shows a schematic diagram of the structure of the optical lens 400 provided in Embodiment 4 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image-side surface S6 of the third lens L3 is convex; the image-side surface S8 of the fourth lens L4 is concave; the object-side surface S8 of the fifth lens L5 is convex; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

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

[0159] Table 4-1

[0160]

[0161]

[0162] The surface profile parameters of the aspherical lens of the optical lens 400 in Example 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 and MTF curve of the optical lens 400 are respectively as follows: Figure 11 , Figure 12 As shown. From Figure 11As can be seen, the distortion of optical lens 400 is controlled within -20% to 0%, indicating that optical lens 400 can effectively correct distortion. From Figure 12 As can be seen, the MTF value of this embodiment is above 0.5 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0166] Example 5

[0167] Please see Figure 13 The figure shows a schematic diagram of the structure of the optical lens 500 provided in Embodiment 5 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image side surface S9 of the fifth lens L5 is a convex surface; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

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

[0169] Table 5-1

[0170]

[0171]

[0172] The surface profile parameters of the aspherical lens of the optical lens 500 in Example 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 and MTF curve of the optical lens 500 are shown as follows: Figure 14 , Figure 15 As shown. From Figure 14 As can be seen, the distortion of optical lens 500 is controlled within -20% to 0%, indicating that optical lens 500 can effectively correct distortion. From Figure 15 As can be seen, the MTF value of this embodiment is above 0.6 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0176] Example 6

[0177] Please see Figure 16The figure shown is a schematic diagram of the structure of the optical lens 600 provided in Embodiment 6 of the present invention. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0178] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6-1.

[0179] Table 6-1

[0180]

[0181]

[0182] The surface profile parameters of the aspherical lens of the optical lens 600 in Example 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 and MTF curve of the optical lens 600 are respectively as follows: Figure 17 , Figure 18 As shown. From Figure 17 As can be seen, the distortion of optical lens 600 is controlled within -20% to 0%, indicating that optical lens 600 can effectively correct distortion. From Figure 18 As can be seen, the MTF value of this embodiment is above 0.6 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0186] Example 7

[0187] Please see Figure 19 The figure shows a schematic diagram of the structure of the optical lens 700 provided in Embodiment 7 of the present invention. The main difference between this embodiment and Embodiment 1 is 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; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

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

[0189] Table 7-1

[0190]

[0191]

[0192] The surface profile parameters of the aspherical lens of the optical lens 700 in Example 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 and MTF curve of the optical lens 700 are shown as follows: Figure 20 , Figure 21 As shown. From Figure 20 As can be seen, the distortion of the optical lens 700 is controlled within -25% to 0%, indicating that the optical lens 700 can effectively correct distortion. From... Figure 21 As can be seen, the MTF value of this embodiment is above 0.5 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0196] Example 8

[0197] Please see Figure 22 The figure shown is a schematic diagram of the structure of the optical lens 800 provided in Embodiment 8 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image side surface S9 of the fifth lens L5 is a convex surface; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

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

[0199] Table 8-1

[0200]

[0201] The surface profile parameters of the aspherical lens of the optical lens 800 in Example 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 and MTF curve of the optical lens 800 are respectively as follows: Figure 23 , Figure 24 As shown. From Figure 23 As can be seen, the distortion of optical lens 800 is controlled within -20% to 0%, indicating that optical lens 800 can effectively correct distortion. From... Figure 24As can be seen, the MTF value of this embodiment is above 0.5 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0205] Example 9

[0206] Please see Figure 25 The figure shown is a schematic diagram of the structure of the optical lens 900 provided in Embodiment 9 of the present invention. The main difference between this embodiment and Embodiment 1 is that: 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; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

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

[0208] Table 9-1

[0209]

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

[0211] Table 9-2

[0212]

[0213]

[0214] In this embodiment, the F-Tan (Theta) distortion curve and MTF curve of the optical lens 900 are respectively as follows: Figure 26 , Figure 27 As shown. From Figure 26 As can be seen, the distortion of the optical lens 900 is controlled within -25% to 0%, indicating that the optical lens 900 can effectively correct distortion. From Figure 27 As can be seen, the MTF value of this embodiment is above 0.5 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0215] Example 10

[0216] Please see Figure 28The figure shown is a schematic diagram of the structure of the optical lens 1000 provided in Embodiment 10 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object side S5 of the third lens L3 is concave and the image side S6 is convex; the image side S11 of the sixth lens L6 is convex; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

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

[0218] Table 10-1

[0219]

[0220] The surface profile parameters of the aspherical lens of the optical lens 1000 in Example 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 and MTF curve of the optical lens 1000 are shown as follows: Figure 29 , Figure 30 As shown. From Figure 29 As can be seen, the distortion of the optical lens 1000 is controlled within -25% to 0%, indicating that the optical lens 1000 can effectively correct distortion. From... Figure 30 As can be seen, the MTF value of this embodiment is above 0.6 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0224] Example 11

[0225] Please see Figure 31 The diagram shows a schematic of the structure of the optical lens 1100 provided in Embodiment 11 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side S5 of the third lens L3 is concave and the image side S6 is convex; the object side S10 of the sixth lens L6 is concave and the image side S11 is convex; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

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

[0227] Table 11-1

[0228]

[0229]

[0230] The surface profile parameters of the aspherical lens of the optical lens 1100 in Example 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 and MTF curve of the optical lens 1100 are respectively as follows: Figure 32 , Figure 33 As shown. From Figure 32 As can be seen, the distortion of optical lens 1100 is controlled within -25% to 0%, indicating that optical lens 1100 can effectively correct distortion. From Figure 33 As can be seen, the MTF value of this embodiment is above 0.5 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0234] Example 12

[0235] Please see Figure 34 The diagram shown is a structural schematic 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 surface S9 of the fifth lens L5 is a convex surface; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

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

[0237] Table 12-1

[0238]

[0239]

[0240] The surface profile parameters of the aspherical lens of the optical lens 1200 in Example 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 and MTF curve of the optical lens 1200 are shown as follows: Figure 35 , Figure 36 As shown. From Figure 35 As can be seen, the distortion of optical lens 1200 is controlled within -20% to 0%, indicating that optical lens 1200 can effectively correct distortion. From Figure 36 As can be seen, the MTF value of this embodiment is above 0.6 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0244] Example 13

[0245] Please see Figure 37 The figure shown is a schematic diagram of the structure 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 surface S6 of the third lens L3 is a convex surface; the image-side surface S9 of the fifth lens L5 is a convex surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

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

[0247] Table 13-1

[0248]

[0249]

[0250] The surface profile parameters of the aspherical lens of the optical lens 1300 in Example 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 and MTF curve of the optical lens 1300 are shown as follows: Figure 38 , Figure 39 As shown. From Figure 38 As can be seen, the distortion of optical lens 1300 is controlled within -20% to 0%, indicating that optical lens 1300 can effectively correct distortion. From... Figure 39 As can be seen, the MTF value of this embodiment is above 0.6 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0254] Example 14

[0255] Please see Figure 40The diagram shown is a structural schematic of the optical lens 1400 provided in Embodiment 14 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image-side surface S6 of the third lens L3 is convex; the image-side surface S9 of the fifth lens L5 is convex; the object-side surface S10 of the sixth lens L6 is concave; and the image-side surface S11 is convex. The optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

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

[0257] Table 14-1

[0258]

[0259] The surface profile parameters of the aspherical lens of the optical lens 1400 in Example 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 and MTF curve of the optical lens 1400 are shown as follows: Figure 41 , Figure 42 As shown. From Figure 41 As can be seen, the distortion of optical lens 1400 is controlled within -20% to 0%, indicating that optical lens 1400 can effectively correct distortion. From Figure 42 As can be seen, the MTF value of this embodiment is above 0.7 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0263] Example 15

[0264] Please see Figure 43 The diagram shown is a structural schematic of the optical lens 1500 provided in Embodiment 15 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image-side surface S6 of the third lens L3 is convex; the image-side surface S9 of the fifth lens L5 is convex; the image-side surface S11 of the sixth lens L6 is convex; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

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

[0266] Table 15-1

[0267]

[0268] The surface profile parameters of the aspherical lens of the optical lens 1500 in Example 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 and MTF curve of the optical lens 1500 are shown as follows: Figure 44 , Figure 45 As shown. From Figure 44 As can be seen, the distortion of the optical lens 1500 is controlled within -25% to 0%, indicating that the optical lens 1500 can effectively correct distortion. From... Figure 45 As can be seen, the MTF value of this embodiment is above 0.6 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0272] Example 16

[0273] Please see Figure 46 The diagram shows a schematic 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 ST is located between the second lens L2 and the third lens L3; the image side S6 of the third lens L3 is convex; the object side S7 of the fourth lens L4 is concave; the third lens L3 and the sixth lens L6 are glass aspherical lenses, while the first lens L1, the second lens L2, the fourth lens L4, and the fifth lens L5 are glass spherical lenses; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

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

[0275] Table 16-1

[0276]

[0277] The surface profile parameters of the aspherical lens of the optical lens 1600 in Example 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 and MTF curve of the optical lens 1600 are shown as follows: Figure 47 , Figure 48 As shown. From Figure 47 As can be seen, the distortion of the optical lens 1600 is controlled within -15% to 0%, indicating that the optical lens 1600 can effectively correct distortion. From... Figure 48 As can be seen, the MTF value of this embodiment is above 0.6 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0281] Example 17

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

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

[0284] Table 17-1

[0285]

[0286]

[0287] The surface profile parameters of the aspherical lens of the optical lens 1700 in Example 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 and MTF curve of the optical lens 1700 are shown as follows: Figure 50 , Figure 51 As shown. From Figure 50 As can be seen, the distortion of the 1700 optical lens is controlled within -15% to 0%, indicating that the 1700 optical lens can effectively correct distortion. From... Figure 51As 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 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

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

[0292] Table 18-1

[0293]

[0294]

[0295] Table 18-2

[0296]

[0297]

[0298] In summary, the optical lens provided by the present invention uses six lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, giving the lens one or more advantages such as large target surface, large aperture, and small distortion.

[0299] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0300] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens comprising six lenses, characterized in that, It successively 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; 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 overall 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 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: 4.2 < TTL / IH < 5.1; The maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 37° < FOV / Fno < 44°; 2. The optical lens according to claim 1, characterized in that, The focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -13.32 < f1 / f < -5.15; The overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.33 < TTL / f < 5.51; 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: 4.27 < TTL / IH < 5.02; 3. The optical lens according to claim 1, characterized in that, The maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 37.3° ≤ FOV / Fno ≤ 43.04°; 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: 1.4 < 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 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 semi-diameter d1 of the object side of the first lens, the true image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy: 2 < d1 / (IH / 2) / tan(FOV / 2) < 3.3; The optical lens further includes an aperture 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 aperture 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, characterized in that, 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, characterized in that, 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 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 curvature radius R4 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, characterized in that, The object-side curvature radius R1 of the first lens and the image-side curvature radius R2 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 object-side clear aperture sagittal height Sag1 of the first lens and the object-side clear aperture d1 of the first lens satisfy: -0.2 < Sag1 / d1 < -0.12; the image-side clear aperture sagittal height Sag2 of the first lens and the image-side clear aperture d2 of the first lens satisfy: -0.08 < Sag2 / d2 < -0.

04.

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

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