Optical lens

Abstract

The invention provides an optical lens, which comprises six lenses from an object side to an imaging surface along an optical axis: a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power and a fifth lens with positive focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, and the image side surface of the third lens is a convex surface; the fourth lens has negative focal power; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; and the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface. According to the optical lens provided by the invention, through specific surface shape setting and reasonable focal power distribution, the overall aberration of the optical lens can be reasonably corrected, so that the optical lens has one or more advantages of miniaturization, long focus, large flux, small distortion, high imaging quality and the like.

Description

Technical Field

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

[0002] With the rapid development of intelligent driving technology, Advanced Driver Assistance Systems (ADAS) play a crucial role in enhancing vehicle safety and driving experience. ADAS integrates optical lenses with multiple sensors to collect and process environmental information in real time, providing accurate decision-making support for drivers. However, while existing ADAS optical lenses meet the requirements of thin and light, small-sized designs, they also need to balance high-pixel, high-resolution imaging performance. Especially in low-light environments, further improvement in imaging clarity and stability is still required. Therefore, there is a need to develop an optical lens with good imaging effects. Summary of the Invention

[0003] Aiming at the above problems, the purpose of the present invention is to provide an optical lens with excellent imaging quality.

[0004] The technical solution adopted by the present invention is as follows: An optical lens, comprising a total of six lenses, which sequentially include, along the optical axis from the object side to the imaging surface: A first lens with a positive optical power, the object side surface of which is convex; A second lens with a negative optical power, the object side surface of which is concave and the image side surface of which is concave; A third lens with a positive optical power, the image side surface of which is convex; A fourth lens with a negative optical power; A fifth lens with a positive optical power, the object side surface of which is convex and the image side surface of which is convex; A sixth lens with a negative optical power, the object side surface of which is concave and the image side surface of which is concave; Wherein, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: 0.6 < f1 / f < 1.3; the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -0.8 < f6 / f < -0.4.

[0005] Further preferably, the sagittal height SAG61 corresponding to the maximum clear aperture semi-diameter of the object side surface of the sixth lens and the central thickness CT6 of the sixth lens on the optical axis satisfy: 0.3 < |SAG61| / CT6 < 1.2.

[0006] Further preferably, the back focal length BFL of the optical lens and the total optical length TTL of the optical lens satisfy: 0.15 < BFL / TTL < 0.32.

[0007] More preferably, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: -1.5 < (R1 + R2) / (R1 - R2) < 0.

[0008] More preferably, the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: -1 < (R11 + R12) / (R11 - R12) < 0.

[0009] More preferably, the sagitta SAG51 corresponding to the maximum clear aperture semi-diameter of the object side surface of the fifth lens, the sagitta SAG52 corresponding to the maximum clear aperture semi-diameter of the image side surface of the fifth lens, and the edge thickness ET5 of the fifth lens satisfy: 0.3 < (SAG51 - SAG52) / ET5 < 1.1.

[0010] More preferably, the focal length f1 of the first lens and the focal length f6 of the sixth lens satisfy: -2 < f1 / f6 < -1.

[0011] More preferably, the maximum clear aperture semi-diameter of the object side surface of the first lens and the maximum clear aperture semi-diameter of the image side surface of the sixth lens satisfy: 1 < DM11 / DM62 < 1.6.

[0012] More preferably, the effective focal length f of the optical lens, the maximum field of view angle FOV of the optical lens, and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.99 < (2×f×tan(FOV / 2)) / IH < 1.05.

[0013] More preferably, the combined focal length f36 of the third lens, the fourth lens, the fifth lens, and the sixth lens and the effective focal length f of the optical lens satisfy: 0.5 < f36 / f < 1.9.

[0014] Compared with the prior art, the optical lens provided by the present invention adopts six lenses with specific optical powers. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberration, improve the imaging quality of the optical lens, and make the lens have one or more advantages such as miniaturization, long focal length, large throughput, small distortion, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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, wherein: Figure 1 It is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0016] Figure 2 It is the axial aberration curve graph of the optical lens in Embodiment 1 of the present invention.

[0017] Figure 3 It is the longitudinal chromatic aberration curve graph of the optical lens in Embodiment 1 of the present invention.

[0018] Figure 4 It is the distortion curve graph of the optical lens in Embodiment 1 of the present invention.

[0019] Figure 5 It is the relative illumination curve graph of the optical lens in Embodiment 1 of the present invention.

[0020] Figure 6 It is the structural schematic diagram of the optical lens in Embodiment 2 of the present invention.

[0021] Figure 7 It is the axial aberration curve graph of the optical lens in Embodiment 2 of the present invention.

[0022] Figure 8 It is the longitudinal chromatic aberration curve graph of the optical lens in Embodiment 2 of the present invention.

[0023] Figure 9 It is the distortion curve graph of the optical lens in Embodiment 2 of the present invention.

[0024] Figure 10 It is the relative illumination curve graph of the optical lens in Embodiment 2 of the present invention.

[0025] Figure 11 It is the structural schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0026] Figure 12 It is the axial aberration curve graph of the optical lens in Embodiment 3 of the present invention.

[0027] Figure 13 It is the longitudinal chromatic aberration curve graph of the optical lens in Embodiment 3 of the present invention.

[0028] Figure 14 It is the distortion curve graph of the optical lens in Embodiment 3 of the present invention.

[0029] Figure 15 It is the relative illumination curve graph of the optical lens in Embodiment 3 of the present invention.

[0030] Figure 16 It is the structural schematic diagram of the optical lens in Embodiment 4 of the present invention.

[0031] Figure 17 It is the axial aberration curve graph of the optical lens in Embodiment 4 of the present invention.

[0032] Figure 18 It is the longitudinal chromatic aberration curve graph of the optical lens in Embodiment 4 of the present invention.

[0033] Figure 19 It is the distortion curve graph of the optical lens in Embodiment 4 of the present invention.

[0034] Figure 20 It is the relative illumination curve graph of the optical lens in Embodiment 4 of the present invention.

[0035] Figure 21 It is the structural schematic diagram of the optical lens in Embodiment 5 of the present invention.

[0036] Figure 22 It is the axial aberration curve graph of the optical lens in Embodiment 5 of the present invention.

[0037] Figure 23 It is the lateral chromatic aberration curve graph of the optical lens in Embodiment 5 of the present invention.

[0038] Figure 24 It is the distortion curve graph of the optical lens in Embodiment 5 of the present invention.

[0039] Figure 25 It is the relative illumination curve graph of the optical lens in Embodiment 5 of the present invention.

[0040] Figure 26 It is the structural schematic diagram of the optical lens in Embodiment 6 of the present invention.

[0041] Figure 27 It is the axial aberration curve graph of the optical lens in Embodiment 6 of the present invention.

[0042] Figure 28 It is the lateral chromatic aberration curve graph of the optical lens in Embodiment 6 of the present invention.

[0043] Figure 29 It is the distortion curve graph of the optical lens in Embodiment 6 of the present invention.

[0044] Figure 30 It is the relative illumination curve graph of the optical lens in Embodiment 6 of the present invention.

[0045] Figure 31 It is the structural schematic diagram of the optical lens in Embodiment 7 of the present invention.

[0046] Figure 32 It is the axial aberration curve graph of the optical lens in Embodiment 7 of the present invention.

[0047] Figure 33 It is the lateral chromatic aberration curve graph of the optical lens in Embodiment 7 of the present invention.

[0048] Figure 34 It is the distortion curve graph of the optical lens in Embodiment 7 of the present invention.

[0049] Figure 35It is the relative illumination curve graph of the optical lens in Embodiment 7 of the present invention.

[0050] Figure 36 It is the structural schematic diagram of the optical lens in Embodiment 8 of the present invention.

[0051] Figure 37 It is the axial aberration curve graph of the optical lens in Embodiment 8 of the present invention.

[0052] Figure 38 It is the longitudinal chromatic aberration curve graph of the optical lens in Embodiment 8 of the present invention.

[0053] Figure 39 It is the distortion curve graph of the optical lens in Embodiment 8 of the present invention.

[0054] Figure 40 It is the relative illumination curve graph of the optical lens in Embodiment 8 of the present invention.

[0055] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific Embodiments

[0056] To better understand the present application, each aspect of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0057] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature and do not represent any limitation on the features. Therefore, without departing from the teachings of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0058] In the drawings, for the sake of convenience of illustration, the thickness, size, and shape of the lenses have been slightly exaggerated. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0059] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object being photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0060] It should also be understood that the terms "comprise", "comprising", "have", "including" and / or "containing", when used in this specification, denote the presence of the stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than individual elements in the list. In addition, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the term "exemplary" is intended to refer to an example or illustration.

[0061] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0062] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0063] The optical lens provided by the embodiment of the present invention has a total of six lenses, which are, in order from the object side to the imaging surface along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens.

[0064] In some embodiments, the first lens may have a positive optical power, its object side is a convex surface, and its image side may be a concave surface or a convex surface. The second lens may have a negative optical power, its object side is a concave surface, and its image side is a concave surface. The third lens may have a positive optical power, its object side may be a concave surface or a convex surface, and its image side is a convex surface. The fourth lens may have a negative optical power, its object side may be a concave surface or a convex surface, and its image side may be a concave surface or a convex surface. The fifth lens may have a positive optical power, its object side is a convex surface, and its image side is a convex surface. The sixth lens may have a negative optical power, its object side is a concave surface, and its image side is a concave surface.

[0065] In some embodiments, the optical lens may further include a diaphragm, and the diaphragm may be located between the second lens and the third lens. It can be understood that the diaphragm is used to limit the amount of incident light to change the brightness of the image.

[0066] In some embodiments, the optical lens may further include a filter and a protective sheet. The filter and the protective sheet may be sequentially disposed between the sixth lens and the imaging surface along the optical axis. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging. The protective sheet serves to protect the optical lens, prevent the photosensitive chip from being damaged, and can improve the impact resistance and scratch resistance of the optical lens, while having almost no impact on the imaging quality of the optical lens.

[0067] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: 0.6 < f1 / f < 1.3. Meeting the above conditions, the first lens moderately converges, which can balance the aberration contributions of the front group and the rear group and avoid the deterioration of the image quality in the marginal field of view.

[0068] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -0.8 < f6 / f < -0.4. Meeting the above conditions, the sixth lens can extend the light convergence point and increase the BFL; and can avoid too large an angle of marginal rays and match the sensor CRA.

[0069] In some embodiments, the sagittal height SAG61 corresponding to the maximum clear aperture semi-diameter on the object side surface of the sixth lens and the central thickness CT6 of the sixth lens on the optical axis satisfy: 0.3 < |SAG61| / CT6 < 1.2. Meeting the above conditions, by appropriately adjusting the ratio of the sagittal height to the thickness of the sixth lens, it is beneficial to lens fabrication and molding, improves the manufacturing yield, and shortens the total length of the optical lens.

[0070] In some embodiments, the back focal length BFL of the optical lens and the total optical length TTL of the optical lens satisfy: 0.15 < BFL / TTL < 0.32. Meeting the above conditions, it can balance the long focal length and the installation adaptability, and ensure that there is sufficient installation space for the imaging filter and the protective sheet.

[0071] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: -1.5 < (R1 + R2) / (R1 - R2) < 0. Further, -1.3 < (R1 + R2) / (R1 - R2) < -0.3. Meeting the above conditions, reasonably control the radii of curvature of the object side surface and the image side surface of the first lens near the optical axis, which is beneficial to controlling the shape of the first lens, correcting the aberration generated by itself, and improving the imaging quality.

[0072] In some embodiments, the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: -1 < (R11 + R12) / (R11 - R12) < 0. Further, -0.9 < (R11 + R12) / (R11 - R12) < -0.1. Satisfying the above conditions can control the light direction, reduce spherical aberration, correct coma, increase light utilization rate, and improve stability.

[0073] In some embodiments, the sag SAG51 corresponding to the maximum clear aperture of the object side surface of the fifth lens, the sag SAG52 corresponding to the maximum clear aperture of the image side surface of the fifth lens, and the edge thickness ET5 of the fifth lens satisfy: 0.3 < (SAG51 - SAG52) / ET5 < 1.1. By reasonably controlling the ratio of the edge thickness to the center thickness of the fifth lens, it is beneficial to the design and processing of the structure of the fifth lens, beneficial to correcting the aberration of each field of view respectively, and beneficial to improving the imaging quality of the optical lens.

[0074] In some embodiments, the focal length f1 of the first lens and the focal length f6 of the sixth lens satisfy: -2 < f1 / f6 < -1. Satisfying the above conditions to form a positive-negative optical power combination can improve the temperature drift stability performance of the lens, help reduce the influence of the ambient temperature on the lens group, and also meet the compactness requirements of the lens.

[0075] In some embodiments, the maximum clear aperture of the object side surface of the first lens and the maximum clear aperture of the image side surface of the sixth lens satisfy: 1 < DM11 / DM62 < 1.6. Further, 1.2 < DM11 / DM62 < 1.5. Satisfying the above conditions, by reasonably setting the ratio of the apertures of the first and last lenses, the lens can have a smaller head size while having a larger imaging surface, and can better meet the balance between miniaturization and high pixel.

[0076] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens, and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.99 < (2×f×tan(FOV / 2)) / IH < 1.05. Satisfying the above conditions can make the lens have a smaller distortion value and can provide a high-definition imaging effect.

[0077] In some embodiments, the combined focal length f36 of the third lens, the fourth lens, the fifth lens, and the sixth lens and the effective focal length f of the optical lens satisfy: 0.5 < f36 / f < 1.9. Satisfying the above conditions, by reasonably controlling the ratio of the combined focal length of the rear lens group to the effective focal length of the optical lens, it is beneficial to control the angle at which the light beam exits the optical lens to reduce the aberration generated by the optical lens.

[0078] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.2 < TTL / f < 1.6. Further, 1.35 < TTL / f < 1.6. Meeting the above conditions can better achieve the miniaturization of the lens. At the same time, when ensuring the same total length of the lens, long-distance target detection can be achieved through long focal lengths.

[0079] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -1.2 < f2 / f < -0.3. Further, -1.05 < f2 / f < -0.4; the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.2 < f3 / f < 3.5. Further, 0.45 < f3 / f < 3.4; the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: -24 < f4 / f < -1. Further, -24 < f4 / f < -1.2; the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.5 < f5 / f < 0.85. Further, 0.5 < f5 / f < 0.8. Meeting the above conditions can ensure the distortion and light transmittance of the lens by reasonably distributing the optical power of each lens.

[0080] In some embodiments, the total optical length TTL of the optical lens and the central thickness CT6 of the sixth lens on the optical axis satisfy: 10 < TTL / CT6 < 30. Further, 12 < TTL / CT6 < 28. Meeting the above conditions can prevent the sixth lens from being too thick by controlling the ratio of the central thickness of the sixth lens to the total length, and avoid high-order spherical aberration or chromatic aberration caused by excessive refraction.

[0081] In some embodiments, the total optical length TTL of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 2.7 < TTL / EPD < 3.15. Meeting the above conditions can ensure that the system has a large aperture. At the same time, by reasonably controlling the light transmittance and total optical length of the optical lens, it is beneficial to the miniaturization of the system.

[0082] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: -0.5 < R1 / R2 < 0.2. Further, -0.5 < R1 / R2 < 0.15. Meeting the above conditions can make the incident light converge to a large extent and allow more light to enter the system, which is beneficial to improving the light input of the lens and enabling the lens to achieve high-definition imaging even in a darker environment.

[0083] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: -1 < (R3 + R4) / (R3 - R4) < 0.5. Further, -0.9 < (R3 + R4) / (R3 - R4) < 0.35. Satisfying the above conditions can reduce the light deflection angle and make the light path more stable; at the same time, it can correct coma and field curvature, improve the flatness of imaging, and enhance the imaging quality of the optical lens.

[0084] In some embodiments, the central thickness CT1 of the first lens on the optical axis and the central thickness CT6 of the sixth lens on the optical axis satisfy: 1.3 < CT1 / CT6 < 3.8. Satisfying the above conditions can control the thickness ratio of the first and last lenses, and balance the structural strength, light path convergence efficiency, and aberration correction ability.

[0085] 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 on the optical axis respectively satisfy: 0.45 < ∑CT / TTL < 0.65. Satisfying the above conditions can effectively compress the total length of the optical lens, and is beneficial to the structural design and production process of the optical lens.

[0086] In some embodiments, the optical lens satisfies the conditional formula: 22 mm < TTL < 29 mm; 15 mm < f < 19 mm; 26° < FOV < 30°; 7 mm < EPD < 10 mm; 1.9 < Fno < 2.1; 7 mm < IH < 10 mm; where TTL represents the total optical length of the optical lens, f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, EPD represents the entrance pupil diameter of the optical lens, Fno represents the aperture value of the optical lens, and IH represents the true image height corresponding to the maximum field of view angle of the optical lens. Satisfying the above conditions indicates that the optical lens provided by the embodiments of the present invention has at least one or more of the advantages of long focal length, miniaturization, large aperture, and large image height.

[0087] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. On the other hand, when the lens material is glass, due to the low dispersion characteristic of the glass itself, the geometric chromatic aberration of the optical system can be effectively corrected. The optical lens provided by the present invention can adopt an all-glass lens structure, which can improve the thermal stability performance, reduce dispersion, effectively correct the chromatic aberration of the optical lens, and enhance the imaging quality.

[0088] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens may be spherical lenses or aspherical lenses. More specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens of the present invention can all adopt spherical lenses.

[0089] The present invention will be further described in multiple embodiments below. In each embodiment, the thickness, curvature radius, and material selection of each lens in the optical lens are slightly different. For specific differences, please refer to the parameter table of each embodiment. The following embodiments are only the preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments only. Any other changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be regarded as equivalent replacement methods and are all included in the protection scope of the present invention.

[0090] Embodiment 1 Please refer to Figure 1 , which shows a schematic structural diagram of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter G1, and a protective sheet G2.

[0091] Among them, the first lens L1 has a positive optical power. Its object side S1 is a convex surface, and its image side S2 is a convex surface; The second lens L2 has a negative optical power. Its object side S3 is a concave surface, and its image side S4 is a concave surface; The third lens L3 has a positive optical power. Its object side S5 is a concave surface, and its image side S6 is a convex surface; The fourth lens L4 has a negative optical power. Its object side S7 is a convex surface, and its image side S8 is a concave surface; The fifth lens L5 has a positive optical power. Its object side S9 is a convex surface, and its image side S10 is a convex surface; The sixth lens L6 has a negative optical power. Its object side S11 is a concave surface, and its image side S12 is a concave surface; The object side S13 and the image side S14 of the filter G1 are both flat surfaces; The object side S15 and the image side S16 of the protective sheet G2 are both flat surfaces; The imaging surface S17 is a flat surface.

[0092] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 all adopt glass spherical lenses.

[0093] The relevant parameters of each lens in the optical lens 100 in Embodiment 1 are shown in Table 1.

[0094] Table 1 In this embodiment, the axial aberration curve graph, lateral chromatic aberration curve graph, distortion curve graph, and relative illumination curve graph of the optical lens 100 are respectively as Figure 2 , Figure 3 , Figure 4 , Figure 5 shown.

[0095] Figure 2 shows the axial aberration curve graph of Embodiment 1, which represents the aberration on the optical axis at the imaging plane for each wavelength. The horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 100 can correct the axial aberration well.

[0096] Figure 3 shows the lateral chromatic aberration curve graph of Embodiment 1, which represents the chromatic aberration at different image heights on the imaging plane for each wavelength relative to the central wavelength (0.55 μm). The horizontal axis represents the chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. It can be seen from the figure that the chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 100 can correct the chromatic aberration excellently.

[0097] Figure 4 shows the distortion curve graph of Embodiment 1, which represents the distortion of light rays at different image heights on the imaging plane. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the image height (unit: mm). It can be seen from the figure that the distortion of the optical lens is controlled within ±0.1%, indicating that the optical lens 100 can correct the distortion excellently.

[0098] Figure 5 shows the relative illumination curve graph of Embodiment 1, which represents the relative illumination values at different field angles on the imaging plane. The horizontal axis represents the semi-field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). It can be seen from the figure that the relative illumination value of the optical lens is still greater than 85% at the maximum semi-field angle, indicating that the optical lens 100 has good relative illumination.

[0099] Embodiment 2 Please refer to Figure 6 , which shows the structural schematic diagram of the optical lens 200 provided in Embodiment 2 of the present invention. Compared with Embodiment 1, the main difference is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0100] The relevant parameters of each lens in the optical lens 200 in Embodiment 2 are shown in Table 2.

[0101] Table 2 In this embodiment, the axial aberration curve graph, lateral color aberration curve graph, distortion curve graph, and relative illumination curve graph of the optical lens 200 are respectively as shown in Figure 7 , Figure 8 , Figure 9 , Figure 10 .

[0102] From Figure 7 , it can be seen that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 200 can correct the axial aberration well. From Figure 8 , it can be seen that the color aberration between the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 200 can correct the color aberration excellently. From Figure 9 , it can be seen that the distortion of the optical lens is controlled within ±0.5%, indicating that the optical lens 200 can correct the distortion excellently. From Figure 10 , it can be seen that the relative illumination value of the optical lens is still greater than 85% at the maximum half field angle, indicating that the optical lens 200 has good relative illumination.

[0103] Embodiment 3 Please refer to Figure 11 , which shows the structural schematic diagram of the optical lens 300 provided in Embodiment 3 of the present invention. Compared with Embodiment 1, the main difference is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0104] The relevant parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3.

[0105] Table 3 In this embodiment, the axial aberration curve graph, lateral color aberration curve graph, distortion curve graph, and relative illumination curve graph of the optical lens 300 are respectively as shown in Figure 12 , Figure 13 , Figure 14 , Figure 15 .

[0106] From Figure 12 , it can be seen that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 300 can correct the axial aberration well. From Figure 13 , it can be seen that the color aberration between the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 300 can correct the color aberration excellently. From Figure 14 , it can be seen that the distortion of the optical lens is controlled within ±1%, indicating that the optical lens 300 can correct the distortion well.Figure 15 It can be seen that the relative illumination value of the optical lens at the maximum semi-field angle is still greater than 85%, indicating that the optical lens 300 has good relative illumination.

[0107] Example 4 Please refer to Figure 16 , which shows the structural schematic diagram of the optical lens 400 provided in Embodiment 4 of the present invention. Compared with Embodiment 1, the main difference is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0108] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4.

[0109] Table 4 In this embodiment, the axial aberration curve diagram, lateral chromatic aberration curve diagram, distortion curve diagram, and relative illumination curve diagram of the optical lens 400 are respectively as Figure 17 , Figure 18 , Figure 19 , Figure 20 shown.

[0110] From Figure 17 it can be seen that the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 400 can correct the axial aberration well. From Figure 18 it can be seen that the chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 400 can correct the chromatic aberration extremely well. From Figure 19 it can be seen that the distortion of the optical lens is controlled within ±0.5%, indicating that the optical lens 400 can correct the distortion extremely well. From Figure 20 it can be seen that the relative illumination value of the optical lens at the maximum semi-field angle is still greater than 85%, indicating that the optical lens 400 has good relative illumination.

[0111] Example 5 Please refer to Figure 21 , which shows the structural schematic diagram of the optical lens 500 provided in Embodiment 5 of the present invention. Compared with Embodiment 1, the main difference is that the image side S2 of the first lens L1 is concave; the object side S5 of the third lens L3 is convex; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0112] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5.

[0113] Table 5 In this embodiment, the axial aberration curve graph, lateral chromatic aberration curve graph, distortion curve graph, and relative illumination curve graph of the optical lens 500 are respectively as shown in Figure 22 , Figure 23 , Figure 24 , Figure 25 .

[0114] It can be seen from Figure 22 that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 500 can correct the axial aberration well. It can be seen from Figure 23 that the chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 500 can correct the chromatic aberration excellently. It can be seen from Figure 24 that the distortion of the optical lens is controlled within ±0.1%, indicating that the optical lens 500 can correct the distortion excellently. It can be seen from Figure 25 that the relative illumination value of the optical lens is still greater than 85% at the maximum half field angle, indicating that the optical lens 500 has good relative illumination.

[0115] Embodiment 6 Please refer to Figure 26 , which shows the structural schematic diagram of the optical lens 600 provided in Embodiment 6 of the present invention. Compared with Embodiment 1, the main difference is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0116] The relevant parameters of each lens in the optical lens 600 in Embodiment 6 are shown in Table 6.

[0117] Table 6 In this embodiment, the axial aberration curve graph, lateral chromatic aberration curve graph, distortion curve graph, and relative illumination curve graph of the optical lens 600 are respectively as shown in Figure 27 , Figure 28 , Figure 29 , Figure 30 .

[0118] It can be seen from Figure 27 that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 600 can correct the axial aberration well. It can be seen from Figure 28 that the chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 600 can correct the chromatic aberration excellently. It can be seen from Figure 29 that the distortion of the optical lens is controlled within ±0.5%, indicating that the optical lens 600 can correct the distortion excellently. It can be seen from Figure 30It can be seen that the relative illumination value of the optical lens at the maximum half field of view angle is still greater than 85%, indicating that the optical lens 600 has good relative illumination.

[0119] Embodiment 7 Please refer to Figure 31 , which shows the structural schematic diagram of the optical lens 700 provided in Embodiment 7 of the present invention. Compared with Embodiment 1, the main differences are as follows: the object side S5 of the third lens L3 is a convex surface; the object side S7 of the fourth lens L4 is a concave surface; the image side S8 of the fourth lens L4 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0120] The relevant parameters of each lens in the optical lens 700 in Embodiment 7 are shown in Table 7.

[0121] Table 7 In this embodiment, the axial aberration curve diagram, lateral chromatic aberration curve diagram, distortion curve diagram, and relative illumination curve diagram of the optical lens 700 are respectively as shown in Figure 32 , Figure 33 , Figure 34 , Figure 35 .

[0122] From Figure 32 it can be seen that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 700 can correct the axial aberration better. From Figure 33 it can be seen that the chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 700 can correct the chromatic aberration extremely well. From Figure 34 it can be seen that the distortion of the optical lens is controlled within ±0.5%, indicating that the optical lens 700 can correct the distortion extremely well. From Figure 35 it can be seen that the relative illumination value of the optical lens at the maximum half field of view angle is still greater than 85%, indicating that the optical lens 700 has good relative illumination.

[0123] Embodiment 8 Please refer to Figure 36 , which shows the structural schematic diagram of the optical lens 800 provided in Embodiment 8 of the present invention. Compared with Embodiment 1, the main differences are as follows: the object side S5 of the third lens L3 is a convex surface; the object side S7 of the fourth lens L4 is a concave surface; the image side S8 of the fourth lens L4 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0124] The relevant parameters of each lens in the optical lens 800 in Embodiment 8 are shown in Table 8.

[0125] Table 8 In this embodiment, the axial aberration curve graph, longitudinal chromatic aberration curve graph, distortion curve graph, and relative illumination curve graph of the optical lens 800 are respectively as shown in Figure 37 , Figure 38 , Figure 39 , Figure 40 .

[0126] It can be seen from Figure 37 that the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 800 can correct the axial aberration well. It can be seen from Figure 38 that the chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 800 can correct the chromatic aberration extremely well. It can be seen from Figure 39 that the distortion of the optical lens is controlled within ±0.5%, indicating that the optical lens 800 can correct the distortion extremely well. It can be seen from Figure 40 that the relative illumination value of the optical lens at the maximum half field angle is still greater than 85%, indicating that the optical lens 800 has good relative illumination.

[0127] Please refer to Table 9 for the optical characteristics corresponding to the above embodiments, including the effective focal length f, total optical length TTL, f-number Fno, true image height IH corresponding to the maximum field of view angle, maximum field of view angle FOV, chief ray angle of incidence CRA at the maximum image height, and the values corresponding to each conditional formula in each embodiment.

[0128] Table 9 Based on the above embodiments, the optical lens provided by the present invention has at least the following advantages: The optical lens provided by the present invention adopts six lenses with specific optical powers. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberration, and improve the imaging quality of the optical lens, making the lens have one or more advantages such as miniaturization, long focal length, large throughput, small distortion, and high imaging quality.

[0129] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0130] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent for the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention shall be subject to 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 positive optical power, whose object side is convex; A second lens with negative optical power, whose object side is concave and whose image side is concave; A third lens with positive optical power, whose image side is convex; A fourth lens with negative optical power; A fifth lens with positive optical power, whose object side is convex and whose image side is convex; A sixth lens with negative optical power, whose object side is concave and whose image side is concave; Wherein, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: 0.6 < f1 / f < 1.3; the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -0.8 < f6 / f < -0.

4.

2. The optical lens according to claim 1, characterized in that: The sagittal height SAG61 corresponding to the maximum clear aperture semi-diameter of the object side of the sixth lens and the central thickness CT6 of the sixth lens on the optical axis satisfy: 0.3 < |SAG61| / CT6 < 1.

2.

3. The optical lens according to claim 1, characterized in that: The back focal length BFL of the optical lens and the total optical length TTL of the optical lens satisfy: 0.15 < BFL / TTL < 0.

32.

4. The optical lens according to claim 1, characterized in that: The curvature radius R1 of the object side of the first lens and the curvature radius R2 of the image side of the first lens satisfy: -1.5 < (R1 + R2) / (R1 - R2) < 0.

5. The optical lens according to claim 1, characterized in that: The curvature radius R11 of the object side of the sixth lens and the curvature radius R12 of the image side of the sixth lens satisfy: -1 < (R11 + R12) / (R11 - R12) < 0.

6. The optical lens according to claim 1, characterized in that: The sagittal height SAG51 corresponding to the maximum clear aperture semi-diameter of the object side of the fifth lens, the sagittal height SAG52 corresponding to the maximum clear aperture semi-diameter of the image side of the fifth lens and the edge thickness ET5 of the fifth lens satisfy: 0.3 < (SAG51 - SAG52) / ET5 < 1.

1.

7. The optical lens according to claim 1, characterized in that: The focal length f1 of the first lens and the focal length f6 of the sixth lens satisfy: -2 < f1 / f6 < -1.

8. The optical lens according to claim 1, characterized in that: The maximum clear aperture semi-diameter of the object side of the first lens and the maximum clear aperture semi-diameter of the image side of the sixth lens satisfy: 1 < DM11 / DM62 < 1.

6.

9. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens, the maximum field of view FOV of the optical lens and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.99 < (2×f×tan(FOV / 2)) / IH < 1.

05.

10. The optical lens according to claim 1, characterized in that: The combined focal length f36 of the third lens, the fourth lens, the fifth lens and the sixth lens and the effective focal length f of the optical lens satisfy: 0.5 < f36 / f < 1.9.

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