Optical lens

Abstract

The present invention provides an optical lens having a total of six lenses, which include, in order from the object side to the image side along the optical axis: a first lens having positive optical power, whose object side surface is convex; a second lens having negative optical power, whose object side surface is concave and whose image side surface is concave; a third lens having positive optical power, whose image side surface is convex; a fourth lens having negative optical power; a fifth lens having positive optical power, whose object side surface is convex and whose image side surface is convex; and a sixth lens having negative optical power, whose object side surface is concave and whose image side surface is concave. The optical lens provided by the present invention can reasonably correct the overall aberration of the optical lens through a specific surface shape setting and reasonable optical power distribution, so that the optical lens has one or more advantages such as miniaturization, long focus, large throughput, small distortion, and high imaging quality.

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 various sensors to collect and process environmental information in real time, providing accurate decision-making support for drivers. However, while the ADAS optical lenses in the prior art meet the requirements of thin and light, miniaturized designs, they also need to take into account the imaging performance of high pixels and high resolutions. Especially in low-light environments, the imaging clarity and stability still need to be further improved. Therefore, an optical lens with good imaging effects needs to be developed. Summary of the Invention

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

[0004] The technical solution adopted by the present invention is as follows:

[0005] An optical lens, comprising a total of six lenses, which sequentially include, along the optical axis from the object side to the imaging surface:

[0006] A first lens with positive optical power, the object side surface of which is convex;

[0007] A second lens with negative optical power, the object side surface of which is concave and the image side surface of which is concave;

[0008] A third lens with positive optical power, the image side surface of which is convex;

[0009] A fourth lens with negative optical power;

[0010] A fifth lens with positive optical power, the object side surface of which is convex and the image side surface of which is convex;

[0011] A sixth lens with negative optical power, the object side surface of which is concave and the image side surface of which is concave;

[0012] 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.

[0013] Further preferably, the sag height SAG61 corresponding to the maximum clear semi-aperture of the object-side surface of the sixth lens and the center thickness CT6 of the sixth lens on the optical axis satisfy: 0.3<|SAG61| / CT6<1.2.

[0014] Further preferably, the back focal length BFL of the optical lens and the total optical length TTL of the optical lens meet the following conditions: 0.15 <BFL / TTL<0.32。

[0015] Further preferably, a curvature radius R1 of the object side surface of the first lens and a curvature radius R2 of the image side surface of the first lens satisfy: -1.5<(R1+R2) / (R1-R2)<0.

[0016] Further preferably, a curvature radius R11 of the object side surface of the sixth lens and a curvature radius R12 of the image side surface of the sixth lens satisfy: -1<(R11+R12) / (R11-R12)<0.

[0017] Further preferably, the sag SAG51 corresponding to the maximum clear semi-aperture of the object side surface of the fifth lens, the sag SAG52 corresponding to the maximum clear semi-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.

[0018] Further preferably, the focal length f1 of the first lens and the focal length f6 of the sixth lens satisfy: -2 <f1 / f6<-1。

[0019] Further preferably, the maximum clear semi-aperture of the object side of the first lens and the maximum clear semi-aperture of the image side of the sixth lens satisfy: 1 <DM11 / DM62<1.6。

[0020] Further preferably, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens and the real 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.

[0021] Further 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 the following relationship: 0.5 <f36 / f<1.9。

[0022] Compared with the existing technology, the optical lens provided by the present invention uses six lenses with specific optical focal lengths. Through the combination of specific surface shapes and reasonable optical focal length distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and improve the imaging quality of the optical lens, so that the lens has one or more advantages such as miniaturization, long focus, large throughput, small distortion, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0024] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0025] Figure 2 1 is an axial aberration curve diagram of the optical lens in Example 1 of the present invention.

[0026] Figure 3 Graph showing the magnification chromatic aberration of the optical lens in Example 1 of the present invention.

[0027] Figure 4 2 is a distortion curve diagram of the optical lens in Example 1 of the present invention.

[0028] Figure 5 This is a relative illumination curve diagram of the optical lens in Example 1 of the present invention.

[0029] Figure 6 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0030] Figure 7 2 is an axial aberration curve diagram of the optical lens in Example 2 of the present invention.

[0031] Figure 8 2 is a graph showing the magnification chromatic aberration curve of the optical lens in Example 2 of the present invention.

[0032] Figure 9 This is a distortion curve diagram of the optical lens in Example 2 of the present invention.

[0033] Figure 10 This is a relative illumination curve diagram of the optical lens in Example 2 of the present invention.

[0034] Figure 11 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0035] Figure 12 4 is an axial aberration curve diagram of the optical lens in Example 3 of the present invention.

[0036] Figure 13 Graph showing the magnification chromatic aberration of the optical lens in Example 3 of the present invention.

[0037] Figure 14 2 is a distortion curve diagram of the optical lens in Example 3 of the present invention.

[0038] Figure 15 This is a relative illumination curve diagram of the optical lens in Example 3 of the present invention.

[0039] Figure 16 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0040] Figure 17 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0041] Figure 18 Graph showing the magnification chromatic aberration of the optical lens in Example 4 of the present invention.

[0042] Figure 19 This is a distortion curve diagram of the optical lens in Example 4 of the present invention.

[0043] Figure 20 This is a relative illumination curve diagram of the optical lens in Example 4 of the present invention.

[0044] Figure 21 Schematic diagram of the structure of the optical lens in Example 5 of the present invention.

[0045] Figure 22 4 is an axial aberration curve diagram of the optical lens in Example 5 of the present invention.

[0046] Figure 23 Graph showing the magnification chromatic aberration of the optical lens in Example 5 of the present invention.

[0047] Figure 24 This is a distortion curve diagram of the optical lens in Example 5 of the present invention.

[0048] Figure 25 This is a relative illumination curve diagram of the optical lens in Example 5 of the present invention.

[0049] Figure 26 Schematic diagram of the structure of the optical lens in Example 6 of the present invention.

[0050] Figure 27 Graph showing the axial aberration of the optical lens in Example 6 of the present invention.

[0051] Figure 28 2 is a graph showing the magnification chromatic aberration curve of the optical lens in Example 6 of the present invention.

[0052] Figure 29 This is a distortion curve diagram of the optical lens in Example 6 of the present invention.

[0053] Figure 30This is a relative illumination curve diagram of the optical lens in Example 6 of the present invention.

[0054] Figure 31 Schematic diagram of the structure of the optical lens in Example 7 of the present invention.

[0055] Figure 32 Graph showing the axial aberration of the optical lens in Example 7 of the present invention.

[0056] Figure 33 Graph showing the magnification chromatic aberration of the optical lens in Example 7 of the present invention.

[0057] Figure 34 This is a distortion curve diagram of the optical lens in Example 7 of the present invention.

[0058] Figure 35 This is a relative illumination curve diagram of the optical lens in Example 7 of the present invention.

[0059] Figure 36 Schematic diagram of the structure of the optical lens in Example 8 of the present invention.

[0060] Figure 37 4 is an axial aberration curve diagram of the optical lens in Example 8 of the present invention.

[0061] Figure 38 2 is a graph showing the magnification chromatic aberration of the optical lens in Example 8 of the present invention.

[0062] Figure 39 This is a distortion curve diagram of the optical lens in Example 8 of the present invention.

[0063] Figure 40 This is a relative illumination curve diagram of the optical lens in Example 8 of the present invention.

[0064] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0065] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of embodiments of the present application and are not intended to 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.

[0066] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of the present invention.

[0067] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0068] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, 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.

[0069] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0070] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0071] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0072] The optical lens provided in the embodiment of the present invention comprises six lenses, which are arranged 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.

[0073] In some embodiments, the first lens may have a positive optical power, with its object side being convex and its image side being concave or convex. The second lens may have a negative optical power, with its object side being concave and its image side being concave. The third lens may have a positive optical power, with its object side being concave or convex and its image side being convex. The fourth lens may have a negative optical power, with its object side being concave or convex and its image side being concave or convex. The fifth lens may have a positive optical power, with its object side being convex and its image side being convex. The sixth lens may have a negative optical power, with its object side being concave and its image side being concave.

[0074] In some embodiments, the optical lens may further include an aperture, which 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 image formation.

[0075] In some embodiments, the optical lens may further include a filter and a protective sheet, and the filter and the protective sheet may be sequentially disposed along the optical axis between the sixth lens and the imaging surface. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging. The protective sheet 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.

[0076] 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.

[0077] 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 angles of marginal rays and match the sensor CRA.

[0078] In some embodiments, 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. Meeting the above conditions, by appropriately adjusting the ratio of the sagittal height to the thickness of the sixth lens, it is beneficial to the lens manufacturing and molding, improves the manufacturing yield, and shortens the total length of the optical lens.

[0079] 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.

[0080] 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. By satisfying the above conditions, the radius of curvature of the object side surface and the image side surface of the first lens at the near optical axis are reasonably controlled, which is conducive to controlling the shape of the first lens, correcting the aberration generated by itself, and improving the imaging quality.

[0081] 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. By satisfying the above conditions, the light direction can be controlled, spherical aberration can be reduced, coma can be corrected, light utilization rate can be increased, and stability can be improved.

[0082] 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 conducive to the design and processing of the structure of the fifth lens, conducive to correcting the aberration of each field of view respectively, and conducive to improving the imaging quality of the optical lens.

[0083] 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. By satisfying the above conditions, a positive-negative optical power combination is formed, which can improve the temperature drift stability performance of the lens, help reduce the influence of environmental temperature on the lens group, and can also meet the compactness requirements of the lens.

[0084] 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. By 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 of miniaturization and high pixel.

[0085] In some embodiments, the effective focal length f of the optical lens, the maximum field angle FOV of the optical lens, and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.99 < (2×f×tan(FOV / 2)) / IH < 1.05. By satisfying the above conditions, the lens can have a smaller distortion value and can provide a high-definition imaging effect.

[0086] 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 of the light beam exiting the optical lens, so as to reduce the aberration generated by the optical lens.

[0087] In some embodiments, the overall 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. Satisfying the above conditions can better achieve the miniaturization of the lens, and at the same time ensure that when the overall length of the lens is the same, long-distance target detection can be achieved through a long focal length.

[0088] 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. Satisfying the above conditions, by reasonably distributing the optical power of each lens, the distortion and light transmittance of the lens are guaranteed.

[0089] In some embodiments, the overall 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. Satisfying the above conditions, by controlling the ratio relationship between the central thickness and the overall length of the sixth lens, the sixth lens is prevented from being too thick, and high-order spherical aberration or chromatic dispersion caused by excessive refraction is avoided.

[0090] In some embodiments, the overall optical length TTL of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 2.7 < TTL / EPD < 3.15. Satisfying the above conditions can ensure that the system has a large aperture, and at the same time, by reasonably controlling the light transmittance and the overall optical length of the optical lens, it is beneficial to the miniaturization of the system.

[0091] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: -0.5 < R1 / R2 < 0.2. Further, -0.5 < R1 / R2 < 0.15. Meeting the above conditions can cause the incident light rays to converge to a greater extent and allow more light rays to enter the system, which is beneficial to increasing the light input of the lens and enabling the lens to achieve high-definition imaging even in a relatively dark environment.

[0092] 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. Meeting 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.

[0093] 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. Meeting the above conditions controls the thickness ratio of the first and last lenses, and balances the structural strength, light path convergence efficiency, and aberration correction ability.

[0094] 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 sixth lens on the optical axis respectively satisfy: 0.45 < ∑CT / TTL < 0.65. Meeting the above conditions can effectively compress the overall length of the optical lens, and is also beneficial to the structural design and production process of the optical lens.

[0095] In some embodiments, the optical lens satisfies the conditional formula: 22mm < TTL < 29mm; 15mm < f < 19mm; 26° < FOV < 30°; 7mm < EPD < 10mm; 1.9 < Fno < 2.1; 7mm < IH < 10mm; where, TTL represents the overall optical length of the optical lens, f represents the effective focal length of the optical lens, FOV represents the maximum field angle of view 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 angle of view of the optical lens. Meeting 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.

[0096] In some embodiments, the lens material of the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, production costs can be effectively reduced. Alternatively, when the lens material is glass, the inherent low dispersion of glass can effectively correct the geometric chromatic aberration of the optical system. The optical lens provided by the present invention can utilize an all-glass lens structure, which can improve thermal stability, reduce dispersion, effectively correct chromatic aberration of the optical lens, and enhance imaging quality.

[0097] 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 may all be spherical lenses.

[0098] The present invention is further illustrated below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens vary; for details, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the present invention is not limited thereto. Any other changes, substitutions, combinations, or simplifications that do not deviate from the novelties of the present invention shall be considered equivalent replacements and are included within the scope of protection of the present invention.

[0099] Example 1

[0100] See also Figure 1 , shown is a schematic structural diagram of the optical lens 100 provided in Example 1 of the present invention, which includes, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, an aperture 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.

[0101] The first lens L1 has positive refractive power, its object-side surface S1 is convex, and its image-side surface S2 is convex;

[0102] The second lens L2 has negative refractive power, its object-side surface S3 is concave, and its image-side surface S4 is concave;

[0103] The third lens L3 has positive refractive power, its object-side surface S5 is concave, and its image-side surface S6 is convex;

[0104] The fourth lens L4 has negative refractive power, its object-side surface S7 is convex, and its image-side surface S8 is concave;

[0105] The fifth lens L5 has positive refractive power, its object-side surface S9 is convex, and its image-side surface S10 is convex;

[0106] The sixth lens L6 has negative refractive power, its object-side surface S11 is concave, and its image-side surface S12 is concave;

[0107] The object-side surface S13 and the image-side surface S14 of the filter G1 are both flat surfaces;

[0108] The object side surface S15 and the image side surface S16 of the protective sheet G2 are both flat surfaces;

[0109] The imaging surface S17 is a plane.

[0110] 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 are all glass spherical lenses.

[0111] Table 1 shows the parameters of the lenses in the optical lens 100 in Example 1.

[0112] Table 1

[0113]

[0114] In this embodiment, the axial aberration curve, the magnification chromatic aberration curve, the distortion curve, and the relative illumination curve of the optical lens 100 are respectively as follows: Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 shown.

[0115] Figure 2 The axial aberration curve of Example 1 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, with the horizontal axis representing the axial aberration value (unit: mm) and the vertical axis representing the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within ±0.03mm, indicating that the optical lens 100 is able to correct the axial aberration well.

[0116] Figure 3 The following graph shows the magnification chromatic aberration curve for Example 1, which plots the chromatic aberration of each wavelength relative to the center wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the 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 graph, the chromatic aberration between the longest and shortest wavelengths is controlled within ±1 μm, demonstrating that the optical lens 100 is capable of excellent chromatic aberration correction.

[0117] Figure 4 A distortion curve diagram for Example 1 is shown, which shows the distortion of light at different image heights on the imaging surface. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the image height (unit: mm). As can be seen from the diagram, the distortion of the optical lens is controlled within ±0.1%, indicating that the optical lens 100 is capable of excellent distortion correction.

[0118] Figure 5 A relative illumination curve for Example 1 is shown, showing relative illumination values ​​at different field angles on the imaging plane. The horizontal axis represents the half field angle (unit: degrees), and the vertical axis represents relative illumination (unit: %). As can be seen from the graph, the relative illumination value of the optical lens is still greater than 85% at the maximum half field angle, indicating that the optical lens 100 has excellent relative illumination.

[0119] Example 2

[0120] See also Figure 6 , shown is a schematic structural diagram of the optical lens 200 provided in Example 2 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0121] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2.

[0122] Table 2

[0123]

[0124] In this embodiment, the axial aberration curve, the magnification chromatic aberration curve, the distortion curve, and the relative illumination curve of the optical lens 200 are respectively as follows: Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 shown.

[0125] from Figure 7 It can be seen from the graph 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. Figure 8 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 200 can correct chromatic aberration very well. Figure 9 It can be seen from the figure that the distortion of the optical lens is controlled within ±0.5%, indicating that the optical lens 200 can correct the distortion very well. Figure 10 It can be seen from the figure that the relative illumination value of the optical lens is still greater than 85% at the maximum half field of view angle, indicating that the optical lens 200 has good relative illumination.

[0126] Example 3

[0127] See also Figure 11 , shown is a schematic structural diagram of the optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, the main difference between this embodiment is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

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

[0129] Table 3

[0130]

[0131] In this embodiment, the axial aberration curve, the magnification chromatic aberration curve, the distortion curve, and the relative illumination curve of the optical lens 300 are respectively as follows: Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 shown.

[0132] from Figure 12 It can be seen from the graph 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. Figure 13 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 300 can correct chromatic aberration very well. Figure 14 It can be seen from the figure 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 from the figure that the relative illumination value of the optical lens is still greater than 85% at the maximum half field of view angle, indicating that the optical lens 300 has good relative illumination.

[0133] Example 4

[0134] See also Figure 16 , shown is a schematic structural diagram of an optical lens 400 provided in Example 4 of the present invention. Compared with Example 1, the main difference between this embodiment is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0135] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4.

[0136] Table 4

[0137]

[0138] In this embodiment, the axial aberration curve, the magnification chromatic aberration curve, the distortion curve, and the relative illumination curve of the optical lens 400 are respectively as follows: Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 shown.

[0139] from Figure 17 It can be seen from the graph 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. Figure 18It 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 400 can correct chromatic aberration very well. Figure 19 It can be seen from the figure that the distortion of the optical lens is controlled within ±0.5%, indicating that the optical lens 400 can correct the distortion very well. Figure 20 It can be seen that the relative illumination value of the optical lens is still greater than 85% at the maximum half field of view angle, indicating that the optical lens 400 has good relative illumination.

[0140] Example 5

[0141] See also Figure 21 , shown is a schematic structural diagram of an optical lens 500 provided in Example 5 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image-side surface S2 of the first lens L1 is concave; the object-side surface S5 of the third lens L3 is convex; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0142] Table 5 shows the relevant parameters of each lens in the optical lens 500 in Example 5.

[0143] Table 5

[0144]

[0145] In this embodiment, the axial aberration curve, the magnification chromatic aberration curve, the distortion curve, and the relative illumination curve of the optical lens 500 are respectively as follows: Figure 22 、 Figure 23 、 Figure 24 、 Figure 25 shown.

[0146] from Figure 22 It can be seen from the graph 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. Figure 23 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 500 can correct chromatic aberration very well. Figure 24 It can be seen from the figure that the distortion of the optical lens is controlled within ±0.1%, indicating that the optical lens 500 can correct the distortion very well. Figure 25 It can be seen that the relative illumination value of the optical lens is still greater than 85% at the maximum half field of view angle, indicating that the optical lens 500 has good relative illumination.

[0147] Example 6

[0148] See also Figure 26, shown is a schematic structural diagram of an optical lens 600 provided in Example 6 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0149] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6.

[0150] Table 6

[0151]

[0152] In this embodiment, the axial aberration curve, the magnification chromatic aberration curve, the distortion curve, and the relative illumination curve of the optical lens 600 are respectively as follows: Figure 27 、 Figure 28 、 Figure 29 、 Figure 30 shown.

[0153] from Figure 27 It can be seen from the graph 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. Figure 28 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 600 can correct chromatic aberration very well. Figure 29 It can be seen from the figure that the distortion of the optical lens is controlled within ±0.5%, indicating that the optical lens 600 can correct the distortion very well. Figure 30 It can be seen that the relative illumination value of the optical lens is still greater than 85% at the maximum half field of view angle, indicating that the optical lens 600 has good relative illumination.

[0154] Example 7

[0155] See also Figure 31 , shown is a schematic structural diagram of an optical lens 700 provided in Example 7 of the present invention. Compared with Example 1, this embodiment has the following main differences: the object-side surface S5 of the third lens L3 is convex; the object-side surface S7 of the fourth lens L4 is concave; the image-side surface S8 of the fourth lens L4 is convex; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0156] The relevant parameters of each lens in the optical lens 700 in Example 7 are shown in Table 7.

[0157] Table 7

[0158]

[0159] In this embodiment, the axial aberration curve, the magnification chromatic aberration curve, the distortion curve, and the relative illumination curve of the optical lens 700 are respectively as follows: Figure 32 、 Figure 33 、 Figure 34 、 Figure 35 shown.

[0160] from Figure 32 It can be seen from the graph that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 700 can correct the axial aberration well. Figure 33 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 700 can correct chromatic aberration very well. Figure 34 It can be seen from the figure that the distortion of the optical lens is controlled within ±0.5%, indicating that the optical lens 700 can correct the distortion very well. Figure 35 It can be seen that the relative illumination value of the optical lens is still greater than 85% at the maximum half field of view angle, indicating that the optical lens 700 has good relative illumination.

[0161] Example 8

[0162] See also Figure 36 , shown is a schematic structural diagram of an optical lens 800 provided in Example 8 of the present invention. Compared with Example 1, this embodiment has the following main differences: the object-side surface S5 of the third lens L3 is convex; the object-side surface S7 of the fourth lens L4 is concave; the image-side surface S8 of the fourth lens L4 is convex; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0163] The relevant parameters of each lens in the optical lens 800 in Example 8 are shown in Table 8.

[0164] Table 8

[0165]

[0166] In this embodiment, the axial aberration curve, the magnification chromatic aberration curve, the distortion curve, and the relative illumination curve of the optical lens 800 are respectively as follows: Figure 37 、 Figure 38 、 Figure 39 、 Figure 40 shown.

[0167] from Figure 37 It can be seen from the graph 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. Figure 38 It can be seen from the figure that the chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±1μm, indicating that the optical lens 800 can correct chromatic aberration very well. Figure 39 It can be seen from the figure that the distortion of the optical lens is controlled within ±0.5%, indicating that the optical lens 800 can correct the distortion very well. Figure 40It can be seen that the relative illumination value of the optical lens is still greater than 85% at the maximum half field of view angle, indicating that the optical lens 800 has good relative illumination.

[0168] Please refer to Table 9, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, real image height IH corresponding to the maximum field of view angle, maximum field of view angle FOV, chief ray incidence angle CRA at the maximum image height, and the numerical value corresponding to each conditional expression in each embodiment.

[0169] Table 9

[0170]

[0171] In summary of the above embodiments, the optical lens provided by the present invention has at least the following advantages:

[0172] The optical lens provided by the present invention uses six lenses with specific optical powers. Through the combination of specific surface shapes and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and improve the imaging quality of the optical lens, so that the lens has one or more advantages such as miniaturization, long focus, large throughput, small distortion, and high imaging quality.

[0173] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations 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 any one or more embodiments or examples.

[0174] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An optical lens, comprising six lenses, characterized in that: From the object side to the imaging surface along the optical axis, it successively includes: A first lens with a positive optical power, whose object side is convex; A second lens with a negative optical power, whose object side is concave and whose image side is concave; A third lens with a positive optical power, whose image side is convex; A fourth lens with a negative optical power; A fifth lens with a positive optical power, whose object side is convex and whose image side is convex; A sixth lens with a 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; the maximum clear aperture radius of the object side of the first lens and the maximum clear aperture radius of the image side of the sixth lens satisfy: 1 < DM11 / DM62 < 1.

6.

2. The optical lens according to claim 1, wherein: The sagittal height SAG61 corresponding to the maximum clear aperture radius 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, wherein: 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, wherein: The curvature radius R1 of the object side of the first lens and the curvature radius R2 of the image side of the first lens satisfy: -1.5 < (R1 + R2) / (R1 - R2) < 0.

5. The optical lens according to claim 1, wherein: 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, wherein: The sagittal height SAG51 corresponding to the maximum clear aperture radius of the object side of the fifth lens, the sagittal height SAG52 corresponding to the maximum clear aperture radius 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, wherein: 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, wherein: 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.

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

05.

10. The optical lens according to claim 1, wherein: 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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