Optical lens

Abstract

The application provides an optical lens, which comprises five lenses in sequence along an optical axis from an object side to an imaging surface, and the five lenses comprise: a first lens with negative optical power, wherein both the object side surface and the image side surface of the first lens are concave; a second lens with positive optical power; a third lens with negative optical power, wherein the object side surface of the third lens is concave; a fourth lens with positive optical power, wherein the object side surface of the fourth lens is concave, and the image side surface of the fourth lens is convex; and a fifth lens with negative optical power, wherein the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave; wherein the maximum field of view FOV and the aperture value FNO of the optical lens satisfy: 52.4°<FOV / FNO<67.3°. 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, large aperture, 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] Today, lidar is widely used for detecting the three-dimensional coordinates and ranging of objects. A lidar system includes a controller, a light source, and a receiver. The controller controls the light source to emit a light beam. When the beam encounters a target object, it undergoes diffuse reflection. The receiver receives the reflected beam and, based on the information from the emitted and reflected beams, determines relevant information about the target object, such as its distance, azimuth, altitude, speed, attitude, and even shape. LiDAR is widely used in autonomous vehicles, drones, autonomous robots, satellites, and rockets.

[0003] As a key component of LiDAR, the optical lens can receive and process the reflected light. However, the current optical lenses of LiDAR suffer from low imaging quality, which cannot meet market demands. 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 five lenses, arranged sequentially along the optical axis from the object side to the imaging plane:

[0007] The first lens with negative optical power has concave object-side and image-side surfaces;

[0008] A second lens with positive optical power;

[0009] A third lens with negative optical power has a concave object side.

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

[0011] The fifth lens with negative optical power has a convex object side and a concave image side.

[0012] The maximum field of view (FOV) and aperture value (FNO) of the optical lens satisfy the following condition: 52.4° <FOV / FNO<67.3°。

[0013] Further preferably, the total optical length (TTL) of the optical lens and the effective focal length (f) of the optical lens satisfy: 1.9 <TTL / f<2.7。

[0014] More preferably, the true image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 0.9 < (IH / 2) / (f×Tan(FOV / 2)) < 1.

[0015] More 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: 1.1 < IH / EPD < 1.5.

[0016] More preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -13.6 < f3 / f < -2.8; the effective focal length f of the optical lens and the object side curvature radius R5 of the third lens satisfy: -16.2 < R5 / f < -1.4.

[0017] More preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.6 < f4 / f < 3.6; the object side curvature radius R7 of the fourth lens and the image side curvature radius R8 of the fourth lens satisfy: 1.5 < R7 / R8 < 2.3.

[0018] More preferably, the combined focal length f12 of the first lens and the second lens and the combined focal length f345 of the third lens, the fourth lens, and the fifth lens satisfy: 0.01 < f12 / f345 < 0.9.

[0019] More preferably, the effective focal length f of the optical lens and the object side curvature radius R7 of the fourth lens satisfy: -3.1 < R7 / f < -0.8.

[0020] More preferably, the object side curvature radius R3 of the second lens and the image side curvature radius R4 of the second lens satisfy: R3 / R4 > 0.05; the second lens is a meniscus lens.

[0021] More preferably, the object side clear aperture sagittal height Sag7 of the fourth lens and the object side clear aperture d7 of the fourth lens satisfy: -0.3 < Sag7 / d7 < -0.01; the image side clear aperture sagittal height Sag8 of the fourth lens and the image side clear aperture d8 of the fourth lens satisfy: -0.4 < Sag8 / d8 < -0.1.

[0022] More preferably, the object side curvature radius R9 of the fifth lens, the image side curvature radius R10 of the fifth lens, and the center thickness CT5 of the fifth lens satisfy: 0.7 < R9 / (R10 + CT5) < 1.1.

[0023] The optical lens provided by this invention uses five 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 aperture, large field of view, and high imaging quality. Attached Figure Description

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

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

[0026] Figure 2 This is a field curvature curve diagram of the optical lens in Embodiment 1 of the present invention.

[0027] Figure 3 This is the F-Tanθ distortion curve of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 4 This is a chromatic aberration curve of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 5 This is an axial aberration curve of the optical lens in Embodiment 1 of the present invention.

[0030] Figure 6 This is an MTF curve of the optical lens in Embodiment 1 of the present invention.

[0031] Figure 7 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.

[0032] Figure 8 This is a field curvature curve diagram of the optical lens in Embodiment 2 of the present invention.

[0033] Figure 9 This is the F-Tanθ distortion curve of the optical lens in Embodiment 2 of the present invention.

[0034] Figure 10 This is a chromatic aberration curve of the optical lens in Embodiment 2 of the present invention.

[0035] Figure 11 This is an axial aberration curve of the optical lens in Embodiment 2 of the present invention.

[0036] Figure 12 This is the MTF curve of the optical lens in Embodiment 2 of the present invention.

[0037] Figure 13 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0038] Figure 14 This is a field curvature curve diagram of the optical lens in Embodiment 3 of the present invention.

[0039] Figure 15 This is the F-Tanθ distortion curve of the optical lens in Embodiment 3 of the present invention.

[0040] Figure 16 This is a chromatic aberration curve of the optical lens in Embodiment 3 of the present invention.

[0041] Figure 17 This is an axial aberration curve of the optical lens in Embodiment 3 of the present invention.

[0042] Figure 18 This is the MTF curve of the optical lens in Embodiment 3 of the present invention.

[0043] Figure 19 This is a schematic diagram of the optical lens in Embodiment 4 of the present invention.

[0044] Figure 20 This is a field curvature curve diagram of the optical lens in Embodiment 4 of the present invention.

[0045] Figure 21 This is the F-Tanθ distortion curve of the optical lens in Embodiment 4 of the present invention.

[0046] Figure 22 This is a chromatic aberration curve of the optical lens in Embodiment 4 of the present invention.

[0047] Figure 23 This is an axial aberration curve of the optical lens in Embodiment 4 of the present invention.

[0048] Figure 24 This is the MTF curve of the optical lens in Embodiment 4 of the present invention.

[0049] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] The optical lens provided in this embodiment of the invention includes five 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, and a fifth lens.

[0058] In some embodiments, the first lens may have a negative optical power, and both its object side and image side are concave. The second lens may have a positive optical power, its object side may be concave or convex, and its image side may be concave or convex. The third lens may have a negative optical power, its object side is concave, and its image side may be concave or convex. The fourth lens may have a positive optical power, its object side is concave, and its image side is convex. The fifth lens may have a negative optical power, its object side is convex, and its image side is concave.

[0059] In some embodiments, the optical lens may further include an aperture, and the aperture may be located 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. In addition, when the aperture is located between the second lens and the third lens, the aperture can reasonably distribute the functions of the first lens to the fifth lens. For example, the first lens and the second lens can be used to receive light to a greater extent, and the third lens to the fifth lens can be used to correct aberrations, which is beneficial to balancing the structure of the entire optical system. In addition, when the aperture is located between the second lens and the third lens, it is convenient to correct the aperture aberration.

[0060] In some embodiments, the optical lens may further include a filter and a protective glass, and the filter and the protective glass are sequentially arranged along the optical axis between the fifth lens and the imaging surface. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging. The protective glass plays a role in protecting the optical lens, preventing the photosensitive chip from being damaged, and can improve the anti-impact and scratch-resistant capabilities of the optical lens, while having almost no impact on the imaging quality of the optical lens.

[0061] In some embodiments, the maximum field of view FOV of the optical lens and the f-number FNO satisfy: 52.4° < FOV / FNO < 67.3°. Meeting the above range defines that the optical lens has a suitable field of view and f-number, and can collect light at a large angle and obtain good imaging quality. More specifically, 58.27° < FOV / FNO < 61.21°.

[0062] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.9 < TTL / f < 2.7. Meeting the above range can effectively limit the length of the lens, which is beneficial to reducing the volume of the optical lens. More specifically, 2.24 < TTL / f < 2.63.

[0063] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 0.9 < (IH / 2) / (f × Tan(FOV / 2)) < 1. Meeting the above range and controlling the distortion of the optical lens within a suitable range is beneficial to increasing the true image height, improving the lens resolution, and enhancing the imaging quality. More specifically, 0.91 < (IH / 2) / (f × Tan(FOV / 2)) < 0.99.

[0064] 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: 1.1 < IH / EPD < 1.5. Meeting the above range and controlling the image height and the entrance pupil diameter within a suitable range helps to increase the width of the light beam entering the optical lens and improve the image plane brightness. More specifically, 1.25 < IH / EPD < 1.32.

[0065] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -13.6 < f3 / f < -2.8; the effective focal length f of the optical lens and the curvature radius R5 of the object side surface of the third lens satisfy: -16.2 < R5 / f < -1.4. Meeting the above range can endow the third lens with an appropriate negative optical power and define the surface shape of the object side surface of the third lens, effectively balancing the lens aberration and enhancing the imaging quality. More specifically, -12.4 < f3 / f < -3.14; -14.78 < R5 / f < -1.53.

[0066] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.6 < f4 / f < 3.6; 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: 1.5 < R7 / R8 < 2.3. Meeting the above range and defining the fourth lens with an appropriate positive optical power and the surface shape of the fourth lens is beneficial to converging light while reducing the light deflection angle, enabling the light to have a smooth transition in its path and improving the imaging quality of the optical lens. More specifically, 1.8 < f4 / f < 3.23; 1.68 < R7 / R8 < 3.

[0067] In some embodiments, the combined focal length f12 of the first lens and the second lens and the combined focal length f345 of the third lens, the fourth lens, and the fifth lens satisfy: 0.01 < f12 / f345 < 0.9. Meeting the above range and defining the focal length ratio of the lens groups before and after the aperture of the optical lens can effectively correct the aberration generated by the lens groups before and after the aperture and improve the imaging quality of the optical lens. More specifically, 0.01 < f12 / f345 < 0.75.

[0068] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R7 of the object side surface of the fourth lens satisfy: -3.1 < R7 / f < -0.8. Meeting the above range and controlling the ratio of the lens focal length to the radius of curvature of the object side surface of the fourth lens within a certain reasonable range helps to further balance the lens aberration and improve the imaging quality. More specifically, -2.89 < R7 / f < -0.98.

[0069] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: R3 / R4 > 0.05; the second lens is a meniscus lens. Meeting the above range and controlling the shapes of the object side surface and the image side surface of the second lens is beneficial to reducing the difficulty of aberration correction of subsequent lenses and improving the imaging quality.

[0070] In some embodiments, the sagittal height Sag7 of the clear aperture of the object side surface of the fourth lens and the clear aperture d7 of the object side surface of the fourth lens satisfy: -0.3 < Sag7 / d7 < -0.01; the sagittal height Sag8 of the clear aperture of the image side surface of the fourth lens and the clear aperture d8 of the image side surface of the fourth lens satisfy: -0.4 < Sag8 / d8 < -0.1. Meeting the above range helps to control the light ray trend and highlight the detailed information of the central field of view of the optical lens. More specifically, -0.27 < Sag7 / d7 < -0.04, -0.38 < Sag8 / d8 < -0.18.

[0071] In some embodiments, the radius of curvature R9 of the object side surface of the fifth lens, the radius of curvature R10 of the image side surface of the fifth lens and the central thickness CT5 of the fifth lens satisfy: 0.7 < R9 / (R10 + CT5) < 1.1. Meeting the above range and reasonably setting the relationship between the surface shape and the thickness of the fifth lens is beneficial to lens processing and improves the yield. More specifically, 0.8 < R9 / (R10 + CT5) < 1.

[0072] In some embodiments, the overall optical length TTL and the true image height IH corresponding to the maximum field angle satisfy: 1.7 < TTL / IH < 2.4. Meeting the above range and controlling the overall optical length and the image height of the optical lens within a suitable range enables the characteristics of a short overall length and a large image plane. More specifically: 1.87 < TTL / IH < 2.24.

[0073] The true image height IH corresponding to the maximum field angle of the optical lens and the radian θ of the maximum half field angle of the optical lens satisfy: 6.1 mm / rad < (IH / 2) / θ < 8.1 mm / rad. Meeting the above range is beneficial to increasing the image plane of the lens and achieving high-definition imaging of the lens. More specifically: 6.7 mm / rad < (IH / 2) / θ < 7.39 mm / rad.

[0074] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -3.5 < f1 / f < -2. Meeting the above range and controlling the first lens to have an appropriate negative optical power helps the optical lens collect light at large angles, helps control distortion and reduce field curvature, thereby improving the geometric accuracy of the imaging surface. More specifically: -3.17 < f1 / f < -2.24.

[0075] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0.8 < f2 / f < 1.3. Meeting the above range and controlling the second lens to have an appropriate positive optical power can converge light, reduce the light deflection angle, and improve the imaging quality. More specifically: 0.91 < f2 / f < 1.18.

[0076] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: f5 / f < -3.9. Meeting the above range and controlling the fifth lens to have an appropriate negative optical power helps increase the imaging area and improve the imaging quality. More specifically: -31.41 < f5 / f < -4.31.

[0077] In some embodiments, the effective focal length f of the optical lens and the combined focal length f12 of the first lens and the second lens satisfy: 1 < f12 / f < 1.7. Meeting the above range can make the combination of the first lens and the second lens act as an optical lens group with a reasonable positive optical power, facilitating the balancing of aberrations and thus obtaining good imaging quality. More specifically: 1.1 < f12 / f < 1.56.

[0078] In some embodiments, the effective focal length f of the optical lens and the curvature radius R1 of the object side surface of the first lens satisfy: -2.4 < R1 / f < -1.4; the effective focal length f of the optical lens and the curvature radius R2 of the image side surface of the first lens satisfy: 10.5 < R2 / f < 19.9. Meeting the above range and reasonably setting the surface shape of the first lens can make the light entering the first lens have appropriate incident and exit angles, which is beneficial to increasing the lens field angle while reducing the outer diameter of the lens and maintaining the miniaturization of the head of the system. More specifically: -2.19 < R1 / f < -1.52; 11.64 < R2 / f < 18.06.

[0079] In some embodiments, the effective focal length f of the optical lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -1.3 < R8 / f < -0.4. Meeting the above range and controlling the lens focal length and the image side surface of the fourth lens within a certain reasonable range helps further balance the lens aberrations and improve the imaging quality. More specifically: -1.18 < R8 / f < -0.57.

[0080] In some embodiments, the effective focal length f of the optical lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: 0.5 < R9 / f < 1.4. Meeting the above range and controlling the lens focal length and the object side surface of the fifth lens within a certain reasonable range can further optimize the spherical aberration and improve the imaging quality. More specifically: 0.62 < R9 / f < 1.2.

[0081] In some embodiments, the effective focal length f of the optical lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: 0.4 < R10 / f < 1.0. Meeting the above range and reasonably controlling the surface shape of the fifth lens can effectively slow down the convergence degree of the incident light. More specifically: 0.48 < R10 / f < 0.9.

[0082] In some embodiments, the curvature radius R6 of the image side surface of the third lens and the curvature radius R7 of the object side surface of the fourth lens satisfy: 0.3 < (R6 - R7) / (R6 + R7) < 1.5. Meeting the above range and reasonably controlling the mutual relationship between the curvature radius of the image side surface of the third lens and the curvature radius of the object side surface of the fourth lens can correct the aberration of the optical lens and improve the imaging quality of the optical imaging lens. More specifically: 0.43 < (R6 - R7) / (R6 + R7) < 1.34.

[0083] In some embodiments, 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: 0.2 < (R7 - R8) / (R7 + R8) < 0.6. Meeting the above range and reasonably limiting the shapes of the object side surface and the image side surface of the fourth lens can control the fourth lens to have an appropriate surface shape and effectively correct the aberration of the optical lens. More specifically: 0.25 < (R7 - R8) / (R7 + R8) < 0.51.

[0084] In some embodiments, the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: 3.9 < (R9 + R10) / (R9 - R10) < 8.6. Meeting the above range and controlling the shapes of the object side surface and the image side surface of the fifth lens can control the fifth lens to have an appropriate surface shape, effectively improve the field curvature and aberration, and enhance the imaging quality. More specifically: 4.36 < (R9 + R10) / (R9 - R10) < 7.94.

[0085] In some embodiments, the overall optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the fifth lens along the optical axis respectively satisfy: 0.35 < ∑CT / TTL < 0.75. Meeting the above range and controlling the overall optical length of the optical lens and the sum of the central thicknesses of each lens within a reasonable range can facilitate the structural design and processing and further improve the imaging quality. More specifically: 0.45 < ∑CT / TTL < 0.66.

[0086] 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: 1.6 < d1 / (IH / 2) / tan(FOV / 2) < 2.3. Satisfying the above range and controlling the clear aperture radius of the object side surface of the first lens, the image plane, and the field angle within a reasonable range helps to define the overall shape of the optical lens and enables the optical lens to have good structural stability. More specifically: 1.82 < d1 / (IH / 2) / tan(FOV / 2) < 2.07.

[0087] In some embodiments, the optical lens satisfies the following conditional expressions: 5.8 mm < f < 7.4 mm; 56.80° < FOV < 71.40°; 5.4 mm < EPD < 7.0 mm; 13.8 mm < TTL < 18.5 mm; 0.9 < FNO < 1.2; 6.6 mm < IH < 9.2 mm; 30° < CRA < 42°; 2.7 mm < BFL < 3.6 mm. In the above conditional expressions, f represents the effective focal length of the optical lens, FOV represents the maximum field 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 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. Satisfying the above range, the optical lens has at least one or more advantages such as miniaturization, large aperture, and large field angle. More specifically: 6.47 mm < f < 6.79 mm; 62.98° < FOV < 65.02°; 6.05 mm < EPD < 6.34 mm; 15.27 mm < TTL < 16.93 mm; 1.05 < FNO < 1.09; 7.6 mm < IH < 8.3 mm; 33.45° < CRA < 37.91°; 2.98 mm < BFL < 3.28 mm.

[0088] 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, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The optical lens provided by the present invention adopts a hybrid structure of five lenses with glass and plastic, which can better achieve high-definition imaging. Specifically, the first lens and the second lens can be glass lenses, and the third lens, the fourth lens, and the fifth lens are all plastic lenses; adopting the hybrid structure of glass and plastic can effectively reduce costs, correct aberrations, reduce volume, and provide an optical lens product with higher cost performance.

[0089] In some embodiments, the first lens, second lens, third lens, fourth lens, and fifth lens can be spherical lenses or aspherical lenses. Compared with spherical structures, aspherical structures can effectively reduce the aberrations of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving lens miniaturization. More specifically, in the optical lens provided by the present invention, the first lens can be a spherical lens, and the second, third, fourth, and fifth lenses can be aspherical lenses.

[0090] 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:

[0091]

[0092] 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.

[0093] 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.

[0094] Example 1

[0095] Please see Figure 1 The diagram shown is a structural schematic 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, an aperture ST, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter G1.

[0096] Among them, the first lens L1 has negative optical power, and its object side S1 and image side S2 are both concave surfaces;

[0097] The second lens L2 has positive optical power, its object side S3 is convex, and its image side S4 is concave.

[0098] The third lens L3 has negative optical power, its object side S5 is concave, and its image side S6 is convex.

[0099] The fourth lens L4 has positive optical power, its object side S7 is concave, and its image side S8 is convex.

[0100] The fifth lens L5 has negative optical power, its object side S9 is convex, and its image side S10 is concave.

[0101] The object-side surface S11 and the image-side surface S12 of the filter G1 are both planar.

[0102] The imaging plane S13 is a plane.

[0103] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0104] Table 1-1

[0105]

[0106] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0107] Table 1-2

[0108] Face number K B C D E F S3 5.52E-01 -1.52E-04 -1.10E-05 9.21E-07 -4.79E-08 1.40E-09 S4 1.46E+02 3.88E-04 -1.60E-05 1.75E-06 -6.92E-08 1.06E-09 S5 6.29E+01 -3.70E-03 2.42E-05 -2.92E-05 3.65E-06 -1.24E-07 S6 1.50E+02 -1.08E-03 6.60E-06 -2.13E-05 6.42E-07 5.76E-09 S7 -1.08E+01 2.26E-03 -2.07E-04 9.02E-06 -1.79E-06 4.29E-08 S8 -1.06E+00 4.47E-03 -5.49E-04 6.48E-05 -4.20E-06 1.03E-07 S9 -8.71E-01 -2.41E-03 1.39E-04 -9.11E-06 4.47E-07 -9.79E-09 S10 -3.98E+00 2.81E-03 -7.95E-05 -2.98E-06 5.72E-07 -1.71E-08

[0109] In this embodiment, the field curvature curve, F-Tanθ distortion curve, transverse chromatic aberration curve, axial aberration curve, and MTF curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown.

[0110] Figure 2 The field curvature curve of Example 1 is shown, which represents the degree of curvature of light of different wavelengths in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within -0.05 mm to 0.05 mm, indicating that the optical lens can effectively correct the field curvature.

[0111] Figure 3 The F-Tanθ distortion curve of Example 1 is shown, which represents the F-Tanθ distortion at different image heights on the imaging plane. The horizontal axis represents the F-Tanθ distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Tanθ distortion of the optical lens 100 is controlled within -6% to 0, indicating that the distortion of the optical lens 100 is well corrected.

[0112] Figure 4The diagram shows the transverse chromatic aberration curves for Example 1, representing the chromatic aberration of each wavelength relative to the center wavelength (0.94 μm) at different image heights on the imaging plane. The horizontal axis represents the transverse chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the normalized field of view. As can be seen from the figure, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2 μm, indicating that the optical lens can excellently correct chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane.

[0113] Figure 5 The diagram shows the axial aberration curves for Example 1, which represent the aberrations of each wavelength along the optical axis at the imaging plane. The horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the diagram, the axial aberration offset is controlled within -0.02 mm to 0.03 mm, indicating that the optical lens can effectively correct axial aberrations.

[0114] Figure 6 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 0.5 throughout the entire field of view. Within the range of 0–60 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.

[0115] Example 2

[0116] Please see Figure 7 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 image side surface S6 of the third lens L3 is concave; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0117] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0118] Table 2-1

[0119]

[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] Face number K B C D E F S3 3.53E-01 8.76E-07 -1.43E-05 1.49E-06 -6.11E-08 1.88E-09 S4 -7.28E+01 5.49E-04 -3.48E-05 3.46E-06 -1.54E-07 2.60E-09 S5 -1.50E+02 -3.40E-03 -1.14E-04 -2.97E-05 4.59E-06 -1.70E-07 S6 -1.50E+02 1.36E-03 -3.65E-04 -1.25E-05 1.03E-06 -7.49E-09 S7 -2.12E+01 3.12E-03 -2.30E-04 -1.59E-05 -6.16E-08 1.60E-08 S8 -7.10E-01 4.89E-03 -5.63E-04 6.42E-05 -4.07E-06 1.05E-07 S9 -7.66E-01 -3.63E-03 1.50E-04 -6.66E-06 2.27E-07 -4.90E-09 S10 -3.87E+00 2.84E-03 -2.34E-04 1.63E-05 -6.37E-07 1.18E-08

[0124] In this embodiment, the field curvature curve, F-Tanθ distortion curve, transverse chromatic aberration curve, axial aberration curve, and MTF curve of the optical lens 200 are respectively as follows: Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 As shown.

[0125] from Figure 8 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.05mm to 0.06mm, indicating that the optical lens 200 can effectively correct the field curvature.

[0126] from Figure 9 As can be seen, the F-Tanθ distortion of optical lens 200 is controlled within -4% to 0, indicating that the distortion of optical lens 200 has been well corrected.

[0127] from Figure 10 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±1.5μm, indicating that the optical lens 200 can correct the chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane very well.

[0128] from Figure 11 As can be seen, the axial aberration offset is controlled within -0.02mm to 0.03mm, indicating that the optical lens 200 can correct axial aberration well.

[0129] from Figure 12 As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. In the range of 0 to 60 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.

[0130] Example 3

[0131] Please see Figure 13 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 surface S3 of the second lens L2 is concave; the image side surface S4 of the second lens L2 is convex; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0132] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0133] Table 3-1

[0134]

[0135] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0136] Table 3-2

[0137] Face number K B C D E F S3 -1.00E+02 -1.62E-03 -4.70E-05 3.39E-06 -1.48E-07 3.67E-09 S4 -7.75E+00 -1.39E-03 3.42E-05 -8.15E-07 5.68E-09 3.41E-10 S5 -7.17E+01 5.81E-03 -5.08E-04 3.17E-05 -9.79E-07 1.50E-09 S6 2.10E+01 -1.40E-04 -4.15E-04 5.62E-05 -2.70E-06 4.27E-08 S7 -7.67E+01 -2.63E-03 1.89E-04 -5.52E-06 2.59E-07 -3.97E-09 S8 -1.09E+00 4.29E-03 -5.60E-04 3.92E-05 -1.57E-06 3.08E-08 S9 -1.86E+00 2.80E-03 -5.20E-04 2.29E-05 -3.30E-07 -8.30E-09 S10 -6.81E+00 8.54E-03 -9.60E-04 5.19E-05 -5.60E-07 -3.47E-08

[0138] In this embodiment, the field curvature curve, F-Tanθ distortion curve, transverse chromatic aberration curve, axial aberration curve, and MTF curve of the optical lens 300 are respectively as follows: Figure 14 , Figure 15 , Figure 16 , Figure 17 , Figure 18 As shown.

[0139] from Figure 14 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.17mm to 0.07mm, indicating that the optical lens 300 can effectively correct field curvature.

[0140] from Figure 15 As can be seen, the F-Tanθ distortion of optical lens 300 is controlled within -6% to 0, indicating that the distortion of optical lens 300 has been well corrected.

[0141] from Figure 16 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±1μm, indicating that the optical lens 300 can correct the chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane very well.

[0142] from Figure 17 As can be seen, the axial aberration offset is controlled within -0.02mm to 0.06mm, indicating that the optical lens 300 can correct axial aberration well.

[0143] from Figure 18 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 60 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.

[0144] Example 4

[0145] Please see Figure 19 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 object side S3 of the second lens L2 is concave; the image side S4 of the second lens L2 is convex; the image side S6 of the third lens L3 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0146] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0147] Table 4-1

[0148]

[0149]

[0150] The surface profile parameters of the aspherical lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0151] Table 4-2

[0152] Face number K B C D E F S3 1.02E+02 -1.97E-03 -4.75E-05 3.05E-06 -1.56E-07 3.86E-09 S4 -7.10E+00 -1.77E-03 3.03E-05 -8.41E-07 -1.82E-09 4.07E-10 S5 -1.09E+02 6.04E-03 -5.23E-04 3.16E-05 -9.55E-07 2.82E-09 S6 9.99E+01 2.39E-05 -4.32E-04 5.53E-05 -2.61E-06 4.08E-08 S7 -5.02E+01 -2.23E-03 1.99E-04 -5.57E-06 2.15E-07 -2.88E-09 S8 -6.50E-01 4.69E-03 -5.83E-04 3.98E-05 -1.57E-06 3.19E-08 S9 -1.38E+00 2.64E-03 -4.78E-04 2.46E-05 -7.50E-07 6.52E-09 S10 -1.06E+01 8.11E-03 -8.33E-04 5.72E-05 -2.50E-06 5.46E-08

[0153] In this embodiment, the field curvature curve, F-Tanθ distortion curve, transverse chromatic aberration curve, axial aberration curve, and MTF curve of the optical lens 400 are respectively as follows: Figure 20 , Figure 21 , Figure 22 , Figure 23 , Figure 24 As shown.

[0154] from Figure 20 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.2mm to 0.07mm, indicating that the optical lens 400 can effectively correct field curvature.

[0155] from Figure 21 As can be seen, the F-Tanθ distortion of optical lens 400 is controlled within -8% to 0, indicating that the distortion of optical lens 400 has been well corrected.

[0156] from Figure 22 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±1μm, indicating that the optical lens 400 can correct the chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane very well.

[0157] from Figure 23 As can be seen, the axial aberration offset is controlled within -0.01mm to 0.03mm, indicating that the optical lens 400 can correct axial aberration well.

[0158] from Figure 24 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 60 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.

[0159] Please refer to Table 5 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value FNO, principal ray incident angle CRA at the maximum image height, true image height IH corresponding to the maximum field of view, maximum field of view FOV, and the values ​​corresponding to each conditional expression in each embodiment.

[0160] Table 5

[0161]

[0162]

[0163] In summary, the optical lens provided by the present invention uses five 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 aperture, large field of view, and high imaging quality.

[0164] 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.

[0165] 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 five lenses, characterized in that, It sequentially includes from the object side to the imaging surface along the optical axis: A first lens with a negative optical power, both its object side and image side being concave; A second lens with a positive optical power; A third lens with a negative optical power, its object side being concave; A fourth lens with a positive optical power, its object side being concave and its image side being convex; A fifth lens with a negative optical power, its object side being convex and its image side being concave; Among them, the maximum field angle FOV of the optical lens and the aperture value FNO satisfy: 52.4° < FOV / FNO < 67.3°; The true image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 0.9 < (IH / 2) / (f×Tan(FOV / 2)) < 1.

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: 1.9 < TTL / f < 2.

7.

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 satisfy: 58.27° < FOV / FNO < 61.21°; The true image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 0.91 < (IH / 2) / (f×Tan(FOV / 2)) < 0.

99.

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 entrance pupil diameter EPD of the optical lens satisfy: 1.1 < IH / EPD < 1.

5.

5. 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: -13.6 < f3 / f < -2.8; the effective focal length f of the optical lens and the curvature radius R5 of the object side of the third lens satisfy: -16.2 < R5 / f < -1.

4.

6. 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: 1.6 < f4 / f < 3.6; the curvature radius R7 of the object side of the fourth lens and the curvature radius R8 of the image side of the fourth lens satisfy: 1.5 < R7 / R8 < 2.

3.

7. The optical lens according to claim 1, characterized in that, The combined focal length f12 of the first lens and the second lens and the combined focal length f345 of the third lens, the fourth lens, and the fifth lens satisfy: 0.01 < f12 / f345 < 0.

9.

8. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the curvature radius R7 of the object side of the fourth lens satisfy: -3.1 < R7 / f < -0.

8.

9. The optical lens according to claim 1, characterized in that, 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:

10. The optical lens according to claim 1, characterized in that, ​ 11. The optical lens according to claim 1, characterized in that, The object-side radius of curvature R9, the image-side radius of curvature R10, and the center thickness CT5 of the fifth lens satisfy the following condition: 0.7 <R9 / (R10+CT5)<1.1。

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