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 focal power, wherein an object side surface of the first lens is a concave surface, and an image side surface of the first lens is a concave surface; a second lens with positive focal power; a third lens with positive focal power; a fourth lens with positive focal power, wherein an object side surface of the fourth lens is a concave surface, and an image side surface of the fourth lens is a convex surface; a fifth lens with negative focal power; and a sixth lens with positive focal power, wherein an object side surface of the sixth lens is a convex surface; wherein a radius of curvature R5 of the object side surface of the third lens and a radius of curvature R6 of the image side surface of the third lens satisfy: -1<(R5-R6) / (R5+R6)<0.9. The optical lens provided by the application can improve the imaging quality of the optical lens, reduce aberration, improve the imaging quality of the optical lens, and make the lens have one or more advantages such as miniaturization, a large target surface, a large aperture, a large field of view, high imaging quality 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] As people's demands for driving experience continue to increase, automotive optical lenses are being used more and more in intelligent driving, and the status of automotive optical lenses in the automotive industry is constantly rising.

[0003] An electronic rearview mirror is an indirect field-of-view device that uses a system composed of cameras and monitors to obtain a specified field of view. It includes electronic equipment such as high-definition cameras, digital vision processing systems, safety systems, and LCD displays, and is a new type of rearview mirror that can replace traditional rearview mirrors. Electronic rearview mirrors are generally designed with a main lens and a wide-angle lens, displaying images on a screen. They provide a wider field of view, eliminate blind spots, help drivers better understand their surroundings, and reduce accidents. Existing electronic rearview mirror lenses not only require a slim and compact design with high pixel count and high resolution, but also require the optical lens to produce clear images under low-light conditions. Therefore, it is necessary to develop an optical lens with excellent imaging performance. 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 comprises 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 concave image side.

[0008] A second lens with positive optical power;

[0009] A third lens with positive optical power;

[0010] The fourth lens with positive optical power has a concave object side and a convex image side.

[0011] A fifth lens with negative optical power;

[0012] The sixth lens has positive optical power and its object side is convex.

[0013] Wherein, the object-side radius of curvature R5 of the third lens and the image-side radius of curvature R6 of the third lens satisfy: -1<(R5-R6) / (R5+R6)<0.9.

[0014] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2.2 < TTL / f < 4; 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: 1.8 < TTL / IH < 2.3.

[0015] Further preferably, the true image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1.8 < IH / EPD < 4.3; the true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1 < IH / f < 2.1.

[0016] Further preferably, the clear aperture radius d1 of the object side of the first lens, the true image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy: 0.73 < d1 / (IH / 2) / tan(FOV / 2) < 1.87; the clear aperture radius d1 of the object side of the first lens and the clear aperture radius d12 of the image side of the sixth lens satisfy: 0.6 < d1 / d12 < 1.46.

[0017] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -3.2 < f1 / f < -0.9; the radius of curvature R1 of the object side of the first lens and the effective focal length f of the optical lens satisfy: -10 < R1 / f < -1; the radius of curvature R2 of the image side of the first lens and the effective focal length f of the optical lens satisfy: 0.6 < R2 / f < 19.9.

[0018] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0.7 < f2 / f < 23; the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -2.4 < f1 / f2 < -0.1.

[0019] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0.8 < f3 / f < 17.8; the radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the image side of the third lens satisfy: 0 < R5 / R6 < 11.

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.7 < f4 / f < 3; the radius of curvature R7 of the object side of the fourth lens and the effective focal length f of the optical lens satisfy: -22 < R7 / f < -3; the radius of curvature R8 of the image side of the fourth lens and the effective focal length f of the optical lens satisfy: -1.3 < R8 / f < -0.4.

[0021] More preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -1.4 < f5 / f < -0.4; the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 0.5 < f6 / f < 29.

[0022] More preferably, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 0.5 < (R7 - R8) / (R7 + R8) < 1; 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: -0.9 < (R1 + R2) / (R1 - R2) < 0.9.

[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, and enhance the imaging quality of the optical lens, enabling the lens to have one or more advantages such as miniaturization, large target surface, large aperture, large field angle, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying 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 a F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 1 of the present invention.

[0027] Figure 3 is a 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 a F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 2 of the present invention.

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

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

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

[0033] Figure 9 This is an 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 structure 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 structure 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 22 This 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] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] The optical lens provided in this embodiment of the invention has a total of 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.

[0067] In some embodiments, the first lens may have a negative optical power, with its object side being concave and its image side being concave. The second lens may have a positive optical power, and its object side may be concave or convex, and its image side may be concave or convex. The third lens may have a positive optical power, and its object side may be concave or convex, and its image side may be concave or convex. The fourth lens may have a positive optical power, with its object side being concave and its image side being convex. The fifth lens may have a negative optical power, and its object side may be concave or convex, and its image side may be concave or convex. The sixth lens may have a positive optical power, with its object side being convex and its image side may be concave or convex.

[0068] In some embodiments, the optical lens may further include an aperture, and the aperture 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 aperture is used to limit the amount of incident light to change the brightness of the imaging. When the aperture is located between the third lens and the fourth lens or between the second lens and the third lens, it is convenient for the correction of aperture aberration.

[0069] In some embodiments, the optical lens may further include a filter, and the filter is disposed between the sixth lens and the imaging surface. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0070] In some embodiments, the radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the image side of the third lens satisfy: -1 < (R5 - R6) / (R5 + R6) < 0.9. Meeting the above range, by controlling the third lens to have a suitable surface shape, it is beneficial to strengthen the correction of higher-order aberrations and reduce the attenuation degree of the relative illumination of the optical lens. At the same time, the third lens adopts a meniscus shape, which is beneficial to correcting the distortion of the optical lens and improving the imaging quality of the optical lens. More specifically, -0.99 < (R5 - R6) / (R5 + R6) < 0.83.

[0071] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2.2 < TTL / f < 4. Meeting the above range can effectively limit the length of the lens and is beneficial to the miniaturization of the optical lens. More specifically, 2.4 < TTL / f < 3.92.

[0072] In some embodiments, 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: 1.8 < TTL / IH < 2.3. Meeting the above range ensures that under the condition of the same overall length of the lens, it has a larger image surface, can match a larger-sized imaging chip to achieve high-definition imaging, and better realizes the balance between the small overall length and the large image surface of the lens. More specifically, 1.96 < TTL / IH < 2.28.

[0073] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1.8 < IH / EPD < 4.3. Meeting the above range is conducive to increasing the light transmission amount, making the brightness of the peripheral field and the central field more uniform. More specifically, 1.88 < IH / EPD < 3.93.

[0074] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1 < IH / f < 2.1. Meeting the above range and controlling the image height and focal length of the optical lens within a reasonable range contribute to the optical lens having the characteristic of a large image plane and improving the imaging quality. More specifically, 1.08 < IH / f < 1.97.

[0075] In some embodiments, the half clear aperture 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: 0.73 < d1 / (IH / 2) / tan(FOV / 2) < 1.87. Meeting the above range can have a small front port diameter while meeting the requirements of the optical lens having a large field angle and a large image plane.

[0076] In some embodiments, the half clear aperture d1 of the object side surface of the first lens and the half clear aperture d12 of the image side surface of the sixth lens satisfy: 0.6 < d1 / d12 < 1.46. Meeting the above range and reasonably matching the aperture ratio of the first lens and the sixth lens facilitate the structural design and contribute to improving the imaging quality of the optical lens.

[0077] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -3.2 < f1 / f < -0.9; the object side surface curvature radius R1 of the first lens and the effective focal length f of the optical lens satisfy: -10 < R1 / f < -1; the image side surface curvature radius R2 of the first lens and the effective focal length f of the optical lens satisfy: 0.6 < R2 / f < 19.9; the object side surface curvature radius R1 of the first lens and the image side surface curvature radius R2 of the first lens satisfy: -0.9 < (R1 + R2) / (R1 - R2) < 0.9. Meeting the above range, by setting the first lens to have a negative refractive power and a suitable surface shape, it is conducive to the first lens accommodating a larger angle of light and collecting as much light as possible into the rear optical system, increasing the light flux while achieving a large field of view. More specifically, -2.95 < f1 / f < -0.98; -9.7 < R1 / f < -1.17; 0.66 < R2 / f < 18.1; -0.85 < (R1 + R2) / (R1 - R2) < 0.84.

[0078] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0.7 < f2 / f < 23. Meeting the above range defines that the second lens has an appropriate positive optical power and has the effect of converging light rays, enabling the diverging light rays to smoothly enter the rear optical system, depressing the peripheral light height, and facilitating the reduction of the aperture of the rear lens. More specifically, 0.8 < f2 / f < 21.71.

[0079] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -2.4 < f1 / f2 < -0.1. Meeting the above range can balance the distribution of the focal lengths of the front lenses of the optical lens, reduce the aberration correction pressure on the rear lens, and improve the imaging quality of the optical lens. More specifically, -2.2 < f1 / f2 < -0.1.

[0080] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0.8 < f3 / f < 17.8; the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: 0 < R5 / R6 < 11. Meeting the above range defines that the third lens has an appropriate positive optical power and a suitable surface shape, which is conducive to the convergence of light rays, can effectively correct the distortion of the edge field of view, reduce the deformation degree of the edge of the captured image, and improve the image quality. More specifically, 0.91 < f3 / f < 16.2; 0 < R5 / R6 < 10.13.

[0081] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.7 < f4 / f < 3; the radius of curvature R7 of the object side surface of the fourth lens and the effective focal length f of the optical lens satisfy: -22 < R7 / f < -3; the radius of curvature R8 of the image side surface of the fourth lens and the effective focal length f of the optical lens satisfy: -1.3 < R8 / f < -0.4; the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: 0.5 < (R7 - R8) / (R7 + R8) < 1. Meeting the above range is conducive to the convergence of light rays, sharing the positive optical power of the second lens and the third lens, can avoid excessive light deflection, and better achieve high-quality imaging of the lens. More specifically, 0.81 < f4 / f < 2.81; -20.16 < R7 / f < -3.34; -1.22 < R8 / f < -0.46; 0.55 < (R7 - R8) / (R7 + R8) < 0.93.

[0082] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -1.4 < f5 / f < -0.4. Meeting the above range makes the light rays in the peripheral field of view show an upward trend, which is conducive to the image points on the imaging surface moving away from the optical axis, so as to facilitate achieving the effect of matching with a large chip, obtaining a larger picture, effectively eliminating aberrations, and improving the resolution ability of the optical lens. More specifically, -1.24 < f5 / f < -0.46.

[0083] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 0.5 < f6 / f < 29. Meeting the above range defines that the sixth lens has a positive optical power, which is conducive to the convergence of light rays, makes the light ray trend 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 avoids the light energy loss caused by the excessive main ray angle of the light rays in the large field of view when reaching the imaging surface, which is conducive to improving the illuminance of the peripheral field of view and is conducive to achieving a short overall optical length. More specifically, 0.52 < f6 / f < 26.78.

[0084] In some embodiments, the effective focal length f of the optical 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: 0.76 < (IH / 2) / (f × Tan(FOV / 2)) < 1.23. Meeting the above range controls the distortion of the optical lens within a reasonable range.

[0085] In some embodiments, the maximum field of view angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 35° < FOV / Fno < 42°. Meeting the above range defines that the optical lens has a suitable field of view angle and aperture value, can collect light rays at large angles, and obtain good imaging quality. More specifically, 36.56° < FOV / Fno < 40.22°.

[0086] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.19 < BFL / f < 0.96. Meeting the above range defines that the optical lens has a suitable back focus, which is convenient for reasonably arranging the positions of each lens, and at the same time reduces the processing and assembly difficulty.

[0087] In some embodiments, the total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the sixth lens along the optical axis respectively satisfy: 0.51 < ∑CT / TTL < 0.84. Meeting the above range reasonably configures the total optical length of the optical lens and the sum of the thicknesses of each lens, which helps to achieve high-pixel characteristics and improve the imaging quality of the optical lens.

[0088] 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: 1.37 < ΣCT / f < 3. Meeting the above range can effectively correct the field curvature and distortion of the optical lens and improve the imaging quality of the optical lens.

[0089] In some embodiments, the curvature radius R5 of the object side surface of the third lens, the curvature radius R6 of the image side surface of the third lens, and the central thickness CT3 of the third lens satisfy: 0 < (R5 + CT3) / R6 < 10. Meeting the above range and reasonably controlling the surface shape and thickness of the third lens can reduce the difficulty of correcting the off-axis field aberration and improve the imaging quality of the optical lens. More specifically, 0 < (R5 + CT3) / R6 < 9.74.

[0090] In some embodiments, the optical lens satisfies the following conditional expressions: 2.8 mm < f < 5.3 mm; 1.4 mm < EPD < 3.1 mm; 11 mm < TTL < 14 mm; 1.6 < Fno < 2.1; 20° < CRA < 32°; 0.9 mm < BFL < 4.3 mm; 60° < FOV < 85°; 5.5 mm < IH < 6 mm. In the above conditional expressions, f represents the effective focal length of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the overall optical length of the optical lens, Fno represents the aperture value of the optical lens, CRA represents the chief ray angle of incidence of the optical lens, BFL represents the back focal length of the optical lens, FOV represents the maximum field angle of the optical lens, and IH represents the true image height corresponding to the maximum field angle of the optical lens. Meeting the above range, the optical lens has at least one or more advantages such as miniaturization, large target surface, large aperture, and large field angle. More specifically, 2.91 mm < f < 5.28 mm; 1.45 mm < EPD < 3.03 mm; 11.24 mm < TTL < 13.01 mm; 1.62 < Fno < 2.01; 20.14° < CRA < 31.24°; 0.98 mm < BFL < 4.19 mm; 61.01° < FOV < 80.01°; 5.71 mm < IH < 5.73 mm.

[0091] 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. 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. In the optical lens provided by the present invention, the first lens is a glass lens, the fourth lens, the fifth lens, and the sixth lens are plastic lenses; the second lens and the third lens are glass or plastic lenses; adopting a glass-plastic hybrid structure can effectively reduce costs, correct aberrations, reduce volume, and provide an optical lens product with higher cost performance.

[0092] In some embodiments, the first, second, third, fourth, fifth, and sixth lenses can be spherical or aspherical lenses. Compared to spherical structures, aspherical structures can effectively reduce aberrations in the optical system, thereby reducing the number of lenses and their size, and better achieving lens miniaturization. More specifically, the first lens of this invention is a spherical lens; the fourth, fifth, and sixth lenses are aspherical lenses; and the second and third lenses are either spherical or aspherical lenses.

[0093] In various embodiments of the present invention, when an aspherical lens is used, the shapes of each aspherical surface of the optical lens satisfy the following equations:

[0094]

[0095] 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.

[0096] 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.

[0097] Example 1

[0098] Please see Figure 1 The diagram shows a schematic of the structure of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging plane, 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, and a filter G1.

[0099] Among them, the first lens L1 has negative optical power, its object side S1 is concave, and its image side S2 is concave.

[0100] The second lens L2 has positive optical power, its object side S3 is convex, and its image side S4 is concave.

[0101] The third lens L3 has positive optical power, its object side S5 is convex, and its image side S6 is concave.

[0102] The fourth lens L4 has positive optical power, its object side S7 is concave, and its image side S8 is convex.

[0103] The fifth lens L5 has negative optical power, its object side S9 is convex, and its image side S10 is concave.

[0104] The sixth lens L6 has positive optical power, its object side S11 is convex, and its image side S12 is convex near the optical axis.

[0105] The object side surface S13 and image side surface S14 of filter G1 are both planes; the imaging surface S15 is a plane.

[0106] The first lens L1 and the third lens L3 are glass spherical lenses, while the second lens L2, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are plastic aspherical lenses.

[0107] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0108] Table 1-1

[0109]

[0110] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0111] Table 1-2

[0112] Face number K B C D E F S3 7.66E+00 1.67E-03 -4.94E-04 5.16E-04 5.22E-05 -4.04E-05 S4 9.04E-01 1.15E-02 -3.77E-04 1.22E-03 1.39E-05 -2.62E-05 S7 -1.00E+02 6.53E-03 -2.90E-03 7.24E-04 2.83E-05 -2.33E-05 S8 -3.41E+00 -7.22E-03 -1.57E-03 2.31E-04 5.91E-06 -5.15E-06 S9 -6.75E+00 -1.12E-02 -1.01E-03 2.19E-04 1.43E-04 -3.34E-05 S10 -3.13E+00 -2.71E-03 1.11E-03 2.91E-04 -3.39E-05 -1.43E-05 S11 3.13E+01 2.68E-02 1.36E-03 -3.40E-04 -2.81E-05 4.55E-06 S12 -1.15E+01 1.42E-02 2.21E-03 -1.33E-04 -5.94E-06 5.96E-06

[0113] 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.

[0114] 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 -8% to 0, indicating that the optical lens 100 can effectively correct distortion.

[0115] Figure 3The 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 0.48 throughout the entire field of view. Within the range of 0–120 lp / mm, the MTF curve decreases smoothly and evenly 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.

[0116] Example 2

[0117] Please see Figure 4 The 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 S3 of the second lens L2 is concave; the image side S4 of the second lens L2 is convex; the object side S9 of the fifth lens L5 is concave; the image side S12 of the sixth lens L6 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0118] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0119] Table 2-1

[0120]

[0121] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0122] Table 2-2

[0123]

[0124]

[0125] In this embodiment, the F-Tan (Theta) distortion curve and MTF curve of the optical lens 200 are shown as follows: Figure 5 , Figure 6 As shown. From Figure 5 As can be seen, the distortion of the optical lens is controlled within -8% to 0%, indicating that the optical lens 200 can effectively correct distortion. From... Figure 6 As can be seen, the MTF value of this embodiment is above 0.58 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.

[0126] Example 3

[0127] 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 object side S3 of the second lens L2 is concave; the image side S4 of the second lens L2 is convex; the object side S9 of the fifth lens L5 is concave; the image side S10 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.

[0128] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0129] Table 3-1

[0130]

[0131] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0132] Table 3-2

[0133]

[0134]

[0135] 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 the optical lens is controlled within -4% to 0%, indicating that the 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.

[0136] Example 4

[0137] Please see Figure 10 The diagram shows a schematic 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 object-side surface S3 of the second lens L2 is concave; the image-side surface S4 of the second lens L2 is convex; the object-side surface S5 of the third lens L3 is concave; the image-side surface S6 of the third lens L3 is convex; the object-side surface S9 of the fifth lens L5 is concave; the image-side surface S10 of the fifth lens L5 is convex; the image-side surface S12 of the sixth lens L6 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0138] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0139] Table 4-1

[0140]

[0141] The surface profile parameters of the aspherical lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0142] Table 4-2

[0143] Face number K B C D E F S3 1.85E+00 -7.93E-03 7.41E-03 2.02E-03 -9.46E-04 1.08E-04 S4 -3.51E+00 -6.21E-03 6.86E-03 9.33E-04 -2.65E-04 4.12E-06 S7 1.00E+02 2.35E-02 -2.39E-03 5.14E-04 -8.21E-05 4.53E-06 S8 -1.29E-01 -1.28E-02 -1.04E-03 9.05E-04 -1.20E-04 5.59E-06 S9 -5.67E+00 1.17E-02 -3.42E-03 -1.55E-04 1.36E-04 -8.45E-06 S10 -2.25E+01 2.57E-02 1.94E-03 -1.17E-03 1.35E-04 1.92E-05 S11 -4.15E+00 2.81E-03 5.42E-04 -7.06E-04 1.96E-04 -1.28E-05 S12 -2.19E+00 -3.14E-03 5.23E-04 -1.20E-04 2.52E-05 2.06E-06

[0144] 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 11 As can be seen, the distortion of the optical lens is controlled within -10% to 0, indicating that the optical lens 400 can effectively correct distortion. From Figure 12 As can be seen, the MTF value of this embodiment is above 0.48 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases 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.

[0145] Example 5

[0146] Please see Figure 13 The diagram shows a schematic 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 object-side surface S3 of the second lens L2 is concave; the image-side surface S4 of the second lens L2 is convex; the object-side surface S5 of the third lens L3 is concave; the image-side surface S6 of the third lens L3 is convex; the object-side surface S9 of the fifth lens L5 is concave; the image-side surface S10 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.

[0147] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0148] Table 5-1

[0149]

[0150]

[0151] The surface profile parameters of the aspherical lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0152] Table 5-2

[0153] Face number K B C D E F S3 -9.35E+01 1.16E-02 2.97E-03 -6.27E-04 -1.41E-04 2.91E-05 S4 1.00E+02 -4.58E-03 2.73E-06 -7.80E-04 2.58E-04 -5.96E-05 S7 1.95E+00 -1.74E-02 3.76E-05 8.93E-05 -1.83E-06 -5.04E-06 S8 -2.34E+00 -5.34E-03 3.24E-03 2.26E-07 -2.47E-05 2.28E-06 S9 -4.88E+00 1.06E-02 -4.42E-05 -4.26E-05 2.60E-05 -2.63E-07 S10 -6.24E+00 9.48E-03 -4.16E-04 -6.29E-05 1.28E-05 -6.10E-07 S11 2.12E+01 1.31E-02 1.26E-03 -1.58E-04 1.34E-06 1.11E-06 S12 -9.35E+01 1.16E-02 2.97E-03 -6.27E-04 -1.41E-04 2.91E-05

[0154] 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 the optical lens is controlled within 0-6%, indicating that the optical lens 500 can effectively correct distortion. From... Figure 15 As can be seen, the MTF value of this embodiment is above 0.38 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases 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.

[0155] Example 6

[0156] Please see Figure 16 The diagram shows a schematic 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 aperture ST is located between the second lens L2 and the third lens L3; the second lens L2 is a glass spherical lens; the third lens L3 is a plastic aspherical lens; the object side S3 of the second lens L2 is concave; the image side S4 of the second lens L2 is convex; the object side S9 of the fifth lens L5 is concave; the image side S12 of the sixth lens L6 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0157] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6-1.

[0158] Table 6-1

[0159]

[0160]

[0161] The surface profile parameters of the aspherical lens of the optical lens 600 in Example 6 are shown in Table 6-2.

[0162] Table 6-2

[0163] Face number K B C D E F S5 -3.11E-01 5.66E-04 8.70E-05 -1.13E-04 3.76E-05 -9.47E-06 S6 -7.59E+00 -1.25E-03 -1.93E-03 -4.16E-04 -3.81E-05 2.90E-05 S7 1.00E+02 -5.19E-03 -1.24E-03 -2.54E-04 -1.82E-05 3.68E-05 S8 1.16E+00 -4.65E-03 1.10E-03 2.08E-04 -1.10E-04 -8.17E-06 S9 1.52E+01 -6.80E-03 -1.93E-03 -6.24E-04 1.71E-05 -6.32E-05 S10 6.43E-01 6.59E-03 4.71E-04 -6.17E-04 2.02E-04 -3.74E-05 S11 3.89E+01 -2.57E-03 1.91E-03 1.37E-05 5.03E-05 -2.03E-05 S12 1.92E+01 -3.68E-04 -5.52E-04 -6.46E-05 -2.32E-06 6.32E-07

[0164] 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 17As can be seen, the distortion of the optical lens is controlled within -16% to 0%, indicating that the optical lens 600 can effectively correct distortion. From... Figure 18 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.

[0165] Example 7

[0166] Please see Figure 19 The diagram shows a schematic 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 aperture ST is located between the second lens L2 and the third lens L3; the second lens L2 is a glass spherical lens; the third lens L3 is a plastic aspherical lens; the object side S3 of the second lens L2 is concave; the image side S4 of the second lens L2 is convex; the object side S9 of the fifth lens L5 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0167] The relevant parameters of each lens in the optical lens 700 in Example 7 are shown in Table 7-1.

[0168] Table 7-1

[0169]

[0170]

[0171] The surface profile parameters of the aspherical lens of the optical lens 700 in Example 7 are shown in Table 7-2.

[0172] Table 7-2

[0173] Face number K B C D E F S5 -1.09E+00 1.49E-03 6.31E-05 -5.91E-04 1.88E-04 -5.49E-05 S6 3.50E+01 3.90E-03 2.09E-03 2.55E-04 -9.08E-05 -3.58E-05 S7 -9.42E+01 7.68E-03 4.52E-03 3.55E-04 -3.11E-05 -2.36E-05 S8 2.49E+00 7.48E-03 -5.04E-04 1.65E-05 -1.19E-05 4.16E-05 S9 9.18E-01 1.14E-02 4.85E-04 -7.23E-04 -3.92E-05 9.42E-06 S10 -1.00E+02 1.43E-02 2.50E-03 -1.44E-04 1.28E-04 -4.34E-05 S11 -2.79E+00 -3.97E-04 1.31E-03 1.96E-04 -2.37E-05 -5.96E-07 S12 6.73E+01 7.66E-03 -2.58E-04 3.31E-04 -5.00E-05 8.94E-06

[0174] 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 is controlled within -20% to 0%, indicating that the 700 optical lens can effectively correct distortion. From... Figure 21 As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. In the range of 0 to 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.

[0175] Example 8

[0176] Please see Figure 22 The diagram shows a schematic 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 aperture ST is located between the second lens L2 and the third lens L3; the second lens L2 is a glass spherical lens; the third lens L3 is a plastic aspherical lens; the image-side surface S4 of the second lens L2 is convex; the object-side surface S5 of the third lens L3 is concave; the image-side surface S6 of the third lens L3 is convex; the object-side surface S9 of the fifth lens L5 is concave; the image-side surface S12 of the sixth lens L6 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0177] The relevant parameters of each lens in the optical lens 800 in Example 8 are shown in Table 8-1.

[0178] Table 8-1

[0179]

[0180] The surface profile parameters of the aspherical lens of the optical lens 800 in Example 8 are shown in Table 8-2.

[0181] Table 8-2

[0182] Face number K B C D E F S5 -1.00E+02 -1.53E-02 2.91E-03 -1.63E-04 1.65E-05 -6.61E-06 S6 -1.31E+01 1.22E-03 9.51E-04 3.21E-04 -6.16E-05 -1.95E-06 S7 -1.00E+02 5.39E-03 -2.56E-03 -4.02E-04 1.46E-04 -1.76E-05 S8 9.82E-01 2.30E-03 -7.56E-04 2.56E-04 -5.57E-06 -2.47E-08 S9 -4.82E+00 5.79E-03 -2.57E-03 -3.17E-04 3.04E-04 -6.07E-05 S10 6.68E-01 1.10E-02 -6.66E-04 -1.52E-04 -7.29E-05 9.90E-06 S11 -1.00E+02 2.48E-03 7.64E-04 -2.96E-04 1.09E-04 -1.86E-05 S12 1.51E+01 -3.92E-03 -5.01E-04 9.23E-06 -1.01E-05 -3.74E-07

[0183] 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 the optical lens is controlled within -16% to 0%, indicating that the 800 optical lens can effectively correct distortion. From... Figure 24 As can be seen, the MTF value of this embodiment is above 0.48 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases 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.

[0184] Example 9

[0185] Please see Figure 25The diagram shows a schematic 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 aperture ST is located between the second lens L2 and the third lens L3; the second lens L2 is a glass spherical lens; the third lens L3 is a plastic aspherical lens; the image-side surface S4 of the second lens L2 is convex; the object-side surface S5 of the third lens L3 is concave; the image-side surface S6 of the third lens L3 is convex; the object-side surface S9 of the fifth lens L5 is concave; the image-side surface S10 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.

[0186] The relevant parameters of each lens in the optical lens 900 in Example 9 are shown in Table 9-1.

[0187] Table 9-1

[0188]

[0189] The surface profile parameters of the aspherical lens of the optical lens 900 in Example 9 are shown in Table 9-2.

[0190] Table 9-2

[0191] Face number K B C D E F S5 -1.00E+02 -3.74E-02 -1.51E-02 1.68E-03 2.92E-04 -3.15E-03 S6 6.07E+01 -3.18E-02 -1.15E-02 2.19E-03 -1.53E-03 1.48E-03 S7 3.45E+00 -4.06E-03 -1.16E-02 -3.02E-03 1.16E-03 -3.95E-04 S8 1.50E-01 3.03E-02 2.12E-03 -2.21E-03 -5.17E-04 1.72E-04 S9 -1.97E+00 4.71E-02 6.22E-03 -2.81E-03 -5.12E-04 1.35E-04 S10 -2.97E+00 2.72E-02 9.57E-04 4.55E-04 2.56E-04 -7.26E-05 S11 -8.01E+00 -2.62E-03 8.99E-04 -1.88E-05 -8.54E-07 -8.73E-08 S12 -1.20E+01 2.01E-02 -1.24E-03 3.13E-05 6.35E-06 -1.01E-06

[0192] 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 is controlled within 0-28%, indicating that the 900 optical lens 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.

[0193] Example 10

[0194] Please see Figure 28 The diagram shows a schematic 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 aperture ST is located between the second lens L2 and the third lens L3; the second lens L2 is a glass spherical lens; the third lens L3 is a plastic aspherical lens; the image-side surface S4 of the second lens L2 is convex; the image-side surface S12 of the sixth lens L6 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0195] The relevant parameters of each lens in the optical lens 1000 in Example 10 are shown in Table 10-1.

[0196] Table 10-1

[0197]

[0198] The surface profile parameters of the aspherical lens of the optical lens 1000 in Example 10 are shown in Table 10-2.

[0199] Table 10-2

[0200]

[0201]

[0202] 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 is controlled within -15% 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 0.45 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.

[0203] Example 11

[0204] Please see Figure 31 The diagram shows a schematic 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 aperture ST is located between the second lens L2 and the third lens L3; the second lens L2 is a glass spherical lens; the third lens L3 is a plastic aspherical lens; the image-side surface S4 of the second lens L2 is convex; the image-side surface S12 of the sixth lens L6 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0205] The relevant parameters of each lens in the optical lens 1100 in Example 11 are shown in Table 11-1.

[0206] Table 11-1

[0207]

[0208] The surface profile parameters of the aspherical lens of the optical lens 1100 in Example 11 are shown in Table 11-2.

[0209] Table 11-2

[0210]

[0211]

[0212] 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 the optical lens is controlled within -25% to 0%, indicating that the 1100 optical lens 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.

[0213] Please refer to Table 12 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, principal ray incident angle CRA at the maximum image height, maximum field of view FOV, and the values ​​corresponding to each conditional expression in each embodiment.

[0214] Table 12

[0215]

[0216]

[0217] 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 miniaturization, large target surface, large aperture, large field of view, and high imaging quality.

[0218] 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.

[0219] 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 sequentially includes from the object side to the imaging surface along the optical axis: A first lens with negative optical power, whose object side surface is concave and whose image side surface is concave; A second lens with positive optical power; A third lens with positive optical power; A fourth lens with positive optical power, whose object side surface is concave and whose image side surface is convex; A fifth lens with negative optical power; A sixth lens with positive optical power, whose object side surface is convex; Wherein, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: -1 < (R5 - R6) / (R5 + R6) < 0.9; 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: 0.73 < d1 / (IH / 2) / tan(FOV / 2) < 1.87; the clear aperture semi-diameter d1 of the object side surface of the first lens and the clear aperture semi-diameter d12 of the image side surface of the sixth lens satisfy: 0.6 < d1 / d12 < 1.46; the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2.2 < TTL / f < 4; the maximum field angle FOV of the optical lens and the f-number Fno of the optical lens satisfy: 35° < FOV / Fno < 42°.

2. The optical lens according to claim 1, characterized in that, The overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2.4 < TTL / f < 3.92; 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: 1.8 < TTL / IH < 2.3; the maximum field angle FOV of the optical lens and the f-number Fno of the optical lens satisfy: 36.56° < FOV / Fno < 40.22°.

3. 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 entrance pupil diameter EPD of the optical lens satisfy: 1.8 < IH / EPD < 4.3; the true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1 < IH / f < 2.

1.

4. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -3.2 < f1 / f < -0.9; the curvature radius R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: -10 < R1 / f < -1; the curvature radius R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: 0.6 < R2 / f < 19.

9.

5. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0.7 < f2 / f < 23; the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -2.4 < f1 / f2 < -0.

1.

6. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0.8 < f3 / f < 17.8; the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 0 < R5 / R6 < 11.

7. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.7 < f4 / f < 3; the object-side curvature radius R7 of the fourth lens and the effective focal length f of the optical lens satisfy: -22 < R7 / f < -3; the image-side curvature radius R8 of the fourth lens and the effective focal length f of the optical lens satisfy: -1.3 < R8 / f < -0.

4.

8. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -1.4 < f5 / f < -0.4; the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 0.5 < f6 / f < 29.

9. The optical lens according to claim 1, characterized in that, The object-side curvature radius R7 of the fourth lens and the image-side curvature radius R8 of the fourth lens satisfy: 0.5 < (R7 - R8) / (R7 + R8) < 1; the object-side curvature radius R1 of the first lens and the image-side curvature radius R2 of the first lens satisfy: -0.9 < (R1 + R2) / (R1 - R2) < 0.9.

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