Optical lens

Abstract

The present invention provides an optical lens, comprising six lenses, characterized in that, along the optical axis, from the object side to the image surface, the following are arranged in order: a first lens having negative focal power, whose object side surface is convex and whose image side surface is concave; a second lens having negative focal power, whose object side surface is convex and whose image side surface is concave; a third lens having positive focal power; an aperture; a fourth lens having negative focal power, whose image side surface is concave; a fifth lens having positive focal power, whose object side surface is convex and whose image side surface is concave; a sixth lens having positive focal power, whose object side surface is convex and whose image side surface is concave; the combined focal length f of the front lens of the aperture position of the optical lens is 前 Combined focal length f of the lens behind the aperture position 后 Satisfy: f 前 / f 后 <‑1.0.

Description

Technical Field

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

[0002] With the development of intelligent automobiles, the vehicle's assisted driving system has gradually improved. As one of the main tools for the assisted driving system to obtain external information, the performance of the on-board camera directly affects the performance of the assisted driving system.

[0003] Compared with ordinary optical lenses, the on-board lenses in driving assistance systems have special requirements. For example, on-board camera lenses require the front aperture to be as small as possible, with strong light transmission capability and the ability to adapt to changes in brightness and darkness in the external environment. At the same time, they are required to have high image clarity, be able to effectively distinguish details of the external environment, and have good thermal stability so that the lens has good resolution at high and low temperatures to meet the special requirements of autonomous driving. Summary of the Invention

[0004] In view of the above problems, the purpose of the present invention is to provide an optical lens that can solve one or more of the above technical problems.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] An optical lens, comprising six lenses, characterized in that, along the optical axis from the object side to the imaging surface, the following are arranged in order:

[0007] a first lens having negative optical power, wherein the object-side surface is convex and the image-side surface is concave;

[0008] a second lens having negative optical power, the object-side surface of which is convex and the image-side surface of which is concave;

[0009] a third lens having positive optical power;

[0010] Aperture;

[0011] a fourth lens element having negative optical power and a concave image-side surface;

[0012] a fifth lens element having positive optical power, whose object-side surface is convex and whose image-side surface is concave;

[0013] a sixth lens element having positive optical power, whose object-side surface is convex and whose image-side surface is concave;

[0014] The combined focal length f of the front lens of the optical lens aperture position 前 Combined focal length f of the lens behind the aperture position 后 Satisfy: f 前 / f 后 <-1.0.

[0015] Preferably, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: TTL / IH<3.0.

[0016] Preferably, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 2.0<IH / f<2.3.

[0017] Preferably, the entrance pupil diameter EPD of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 3.8<IH / EPD<4.0.

[0018] Preferably, the maximum field of view FOV of the optical lens and the incident angle CRA of the principal ray of the maximum field of view on the image plane satisfy: 2.5<(FOV / 2) / CRA<3.8.

[0019] Preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -12.0<f2 / f<-3.0.

[0020] Preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 3.0<f6 / f<4.5.

[0021] Preferably, the effective focal length f of the optical lens is equal to the object side curvature radius R of the sixth lens. 11 and the image side curvature radius R 12 Satisfy respectively: 1.5<R 11 / f<1.8;2.5<R 12 / f<15.0.

[0022] Preferably, the sag height Sag of the image side of the sixth lens is 12 and clear semi-aperture d 12 Satisfaction: 0.15<Sag 12 / d 12 <0.30.

[0023] Preferably, the total optical length TTL of the optical lens and the sum ΣCT of the center thicknesses of the first to sixth lenses along the optical axis satisfy: 0.50<ΣCT / TTL<0.70.

[0024] Compared with the prior art, the beneficial effects of the present invention are: by reasonably matching the lens shapes and optical focal lengths of the lenses, the advantages of high relative contrast, excellent thermal stability, and low processing difficulty are achieved.

[0025] Additional aspects and advantages of the present invention will be given in part in the description which follows and in part will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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:

[0027] Figure 1 Schematic diagram of the structure of the optical lens of Example 1 of the present invention.

[0028] Figure 2 Graph showing the field curvature of the optical lens in Example 1 of the present invention.

[0029] Figure 3 2 is a graph showing the F-Tanθ distortion curve of the optical lens in Example 1 of the present invention.

[0030] Figure 4 This is a relative illumination curve diagram of the optical lens in Example 1 of the present invention.

[0031] Figure 5 This is the MTF curve of the optical lens in Example 1 of the present invention.

[0032] Figure 6 1 is an axial aberration curve diagram of the optical lens in Example 1 of the present invention.

[0033] Figure 7 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0034] Figure 8 Schematic diagram of the structure of the optical lens of Example 2 of the present invention.

[0035] Figure 9 Graph showing the field curvature of the optical lens in Example 2 of the present invention.

[0036] Figure 10 2 is a graph showing the F-Tanθ distortion curve of the optical lens in Example 2 of the present invention.

[0037] Figure 11 This is a relative illumination curve diagram of the optical lens in Example 2 of the present invention.

[0038] Figure 12 This is an MTF curve diagram of the optical lens in Example 2 of the present invention.

[0039] Figure 13 2 is an axial aberration curve diagram of the optical lens in Example 2 of the present invention.

[0040] Figure 14 Graph showing vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0041] Figure 15 Schematic diagram of the structure of the optical lens of Example 3 of the present invention.

[0042] Figure 164 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0043] Figure 17 2 is a graph showing the F-Tanθ distortion curve of the optical lens in Example 3 of the present invention.

[0044] Figure 18 This is a relative illumination curve diagram of the optical lens in Example 3 of the present invention.

[0045] Figure 19 This is the MTF curve of the optical lens in Example 3 of the present invention.

[0046] Figure 20 4 is an axial aberration curve diagram of the optical lens in Example 3 of the present invention.

[0047] Figure 21 Graph showing vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0048] Figure 22 Schematic diagram of the structure of the optical lens of Example 4 of the present invention.

[0049] Figure 23 4 is a field curvature curve diagram of the optical lens in Example 4 of the present invention.

[0050] Figure 24 4 is an F-Tanθ distortion curve of the optical lens in Example 4 of the present invention.

[0051] Figure 25 This is a relative illumination curve diagram of the optical lens in Example 4 of the present invention.

[0052] Figure 26 This is the MTF curve of the optical lens in Example 4 of the present invention.

[0053] Figure 27 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0054] Figure 28 Graph showing vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0055] Figure 29 Schematic diagram of the structure of the optical lens of Example 5 of the present invention.

[0056] Figure 30 4 is a field curvature curve diagram of the optical lens in Example 5 of the present invention.

[0057] Figure 31 4 is an F-Tanθ distortion curve of the optical lens in Example 5 of the present invention.

[0058] Figure 32 This is a relative illumination curve diagram of the optical lens in Example 5 of the present invention.

[0059] Figure 33 This is the MTF curve of the optical lens in Example 5 of the present invention.

[0060] Figure 34 4 is an axial aberration curve diagram of the optical lens in Example 5 of the present invention.

[0061] Figure 35 Graph showing vertical axis chromatic aberration of the optical lens in Example 5 of the present invention. DETAILED DESCRIPTION

[0062] For a better understanding of the present invention, various aspects of the present invention will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of the present invention and are not intended to limit the scope of the present invention in any way. Throughout this specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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. Furthermore, 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. Furthermore, when describing embodiments of the invention, "may" is used to mean "one or more embodiments of the invention." Furthermore, the term "exemplary" is intended to refer to an example or illustration.

[0067] 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 the present invention 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.

[0068] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0069] The optical lens according to the embodiment of the present invention includes, from the object side to the image side, a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, a sixth lens, a filter, and a protective glass.

[0070] In some embodiments, the first lens may have negative optical power, which helps reduce the inclination angle of the incident light, thereby effectively sharing the large object-side field of view. The object-side surface of the first lens is convex, and the image-side surface is concave, which helps to obtain a larger field of view angle range. In addition, in practical applications, considering the outdoor installation and use environment of automotive application lenses, the lens may be exposed to inclement weather such as rain and snow. Setting the first lens in a meniscus shape with the convex surface facing the object side can help water droplets slide off, reducing the impact on the lens imaging.

[0071] In some embodiments, the second lens element may have negative optical power, which can share the negative optical power at the front end of the optical lens. This helps avoid excessive light deflection caused by the overly concentrated optical power of the first lens element, thereby reducing the difficulty of correcting chromatic aberration in the optical lens. The second lens element has a convex object-side surface and a concave image-side surface, which helps improve the ability to collect light from the edge of the field of view while reducing the working aperture of the second lens, thereby facilitating the miniaturization of the rear end of the optical lens. It also effectively avoids vertical axial chromatic aberration caused by excessive deflection angles of light from the edge of the field of view during the transmission of light from the first lens to the second lens, thus reducing the difficulty of correcting chromatic aberration in the optical lens element.

[0072] In some embodiments, the third lens element may have positive refractive power, which helps to reduce the light deflection angle and ensure a smooth transition of light.

[0073] In some embodiments, the fourth lens may have negative optical power, which is beneficial for increasing the imaging area of the optical lens and improving the imaging quality of the optical lens.

[0074] In some embodiments, the fifth lens element may have positive optical power, which improves the ability to converge light at the edges of the field of view while effectively controlling the overall optical length and reducing the size of the optical lens, thereby facilitating miniaturization. The fifth lens element may have a convex image-side surface, which facilitates a smooth transition of light at the edges and improves the imaging quality of the optical lens.

[0075] In some embodiments, the sixth lens element may have positive refractive power, which helps suppress the angle of incidence of the peripheral field of view on the imaging plane, effectively transmitting more light beams to the imaging plane, and improving the imaging quality of the optical lens. The sixth lens element has a convex object-side surface and a concave image-side surface, which helps improve the relative illumination of the peripheral field of view, avoid the generation of vignetting, and enhance the imaging quality of the optical lens.

[0076] In some embodiments, a stop for limiting the light beam may be provided between the third lens and the fourth lens, thereby reducing the generation of optical lens ghosts.

[0077] In some embodiments, the aperture value FNO of the optical lens satisfies: 1.70 < FNO < 1.90. Meeting the above range allows the optical lens to achieve a balance between brightness and clarity of the imaging surface, meeting the shooting requirements of the optical lens.

[0078] In some embodiments, the maximum field of view (FOV) of the optical lens satisfies the following conditions: 130°≤FOV. Meeting the above range facilitates achieving wide-angle characteristics, thereby enabling the acquisition of more scene information and meeting the requirements of wide-range detection of the optical lens.

[0079] In some embodiments, the incident angle (CRA) of the principal ray of the optical lens's maximum field of view on the image plane satisfies the following conditions: 16° < CRA < 26°. Meeting this range allows for a larger tolerance between the CRA of the optical lens and the CRA of the chip's photosensitive element, improving the optical lens's adaptability to image sensors.

[0080] In some embodiments, the total optical length (TTL) of the optical lens and the true image height (IH) corresponding to the maximum field of view (FOV) satisfy the following equation: TTL / IH < 3.0. Meeting this range facilitates achieving a balance between excellent imaging quality and compact design, meeting the requirements of optical lenses in confined working environments.

[0081] In some embodiments, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view satisfy the following conditions: 2.0 < IH / f < 2.3. Meeting this range enables both wide-angle performance, thus meeting the requirements of large-scale detection, and a large image plane, thereby improving the imaging quality of the optical system.

[0082] In some embodiments, the optical back focus (BFL) and effective focal length (f) of the optical lens satisfy the following relationship: 1.0 < BFL / f. Meeting this range helps strike a balance between good imaging quality and an optical back focus length that facilitates assembly, ensuring optical lens imaging quality while reducing the complexity of the camera module assembly process.

[0083] In some embodiments, the optical lens' entrance pupil diameter (EPD) and the true image height (IH) corresponding to the maximum field of view (FOV) satisfy the following relationship: 3.8 < IH / EPD < 4.0. Meeting this range increases the width of the light beam entering the optical lens, improving brightness at the image plane and preventing vignetting, while also increasing the imaging area of the optical lens.

[0084] In some embodiments, the maximum field of view (FOV) of the optical lens and the angle of incidence (CRA) of the principal ray at the maximum field of view on the image plane satisfy the following relationship: 2.5 < (FOV / 2) / CRA < 3.8. Meeting this range allows the optical lens to achieve a large field of view while ensuring that incident light strikes the image sensor at an appropriate angle, thereby improving the image sensor's photosensitivity and enhancing the imaging quality of the optical lens.

[0085] In some embodiments, the effective focal length f, maximum field of view (FOV), and true image height (IH) corresponding to the maximum field of view of the optical lens satisfy the following conditions: 0.45 < (IH / 2) / (f × Tan (FOV / 2)) < 0.55. Meeting these limits allows the distortion of the optical lens to be controlled within a reasonable range, facilitating subsequent restoration using software algorithms.

[0086] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens element satisfy the following conditions: -2.5 < f1 / f < -1.5. Meeting this range allows the first lens element to have an appropriate negative focal power, which helps reduce the inclination angle of the incident light, thereby effectively sharing the large object-side field of view and achieving a wider field of view angle range.

[0087] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy the following: -12.0 < f2 / f < -3.0. Meeting this range allows the second lens to have an appropriate negative focal power, which can offset the negative focal power of the front end of the optical lens, thereby helping to avoid excessive light deflection caused by the overly concentrated focal length of the first lens.

[0088] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens element satisfy the following relationship: 1.5 < f3 / f < 20.0. Meeting this range allows the third lens element to have an appropriately positive focal power, which helps converge light while reducing the angle of light deflection, ensuring a smooth transition of light and improving the imaging quality of the optical lens.

[0089] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens element satisfy the following: -5.5 < f4 / f < -1.0. Meeting this range allows the fourth lens element to have an appropriate negative focal power, which helps increase the imaging area of the optical lens and improve the imaging quality of the optical lens.

[0090] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fifth lens element satisfy the following: 1.0 < f5 / f < 1.5. Meeting this range allows the fifth lens element to have an appropriately positive focal power, which improves the ability to converge light in the peripheral field of view. It also effectively controls the overall optical length and reduces the size of the optical lens, thereby facilitating miniaturization. Furthermore, by combining the fifth lens element with the fourth lens element to form a cemented lens, chromatic aberration of the optical lens can be balanced, improving the imaging quality of the optical lens.

[0091] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens element satisfy the following: 3.0 < f6 / f < 4.5. Meeting this range allows the sixth lens element to have an appropriately positive refractive power, which helps suppress the angle of incidence of the peripheral field of view on the imaging surface, effectively transmitting more light beams to the imaging surface, and improving the imaging quality of the optical lens.

[0092] In some embodiments, the combined focal length f of the front lens at the optical lens stop position is 前 Combined focal length f of the lens behind the aperture position 后 Satisfy: f 前 / f 后 <-1.0. Meeting the above range can reduce the difficulty of correcting various aberrations in the lens group behind the aperture of the optical lens, and at the same time is conducive to improving the temperature drift problem of the optical lens and enhancing the imaging quality of the optical lens.

[0093] In some embodiments, the effective focal length f of the optical lens is equal to the object side curvature radius R of the sixth lens. 11 and the image side curvature radius R 12 Satisfy respectively: 1.5<R 11 / f<1.8;2.5<R 12 / f<15.0. Meeting the above range can ensure that the imaging surface of the edge field of view of the optical lens has a sufficiently high relative illumination while reducing the astigmatism of the edge field of view, thereby improving the imaging quality of the optical lens.

[0094] In some embodiments, the sag of the image side of the sixth lens is 12 and clear semi-aperture d 12 Satisfaction: 0.15<Sag 12 / d 12 <0.30. Meeting the above range can converge the light beams in the edge field of view and improve the imaging quality in the edge field of view.

[0095] In some embodiments, the total optical length TTL of the optical lens and the sum of the center thicknesses of the first to sixth lenses along the optical axis ΣCT satisfy the following: 0.50 < ΣCT / TTL < 0.70. Meeting the above range can increase the proportion of the lens in the optical lens, which can improve.

[0096] In order to make the system have better optical performance, multiple aspheric lenses are used in the lens, and the shape of each aspheric surface of the optical lens satisfies the following equation:

[0097]

[0098] Where z is the distance between the surface and the vertex in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the surface vertex, K is the quadratic surface coefficient, and A, B, C, D, E, and F are the second-order, fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients, respectively.

[0099] 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.

[0100] Example 1

[0101] See also Figure 1 , shown is a schematic structural diagram of the optical lens 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, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter G1, and a protective glass G2.

[0102] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0103] The second lens L2 has negative refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0104] The third lens L3 has positive refractive power, and its object-side surface S5 and image-side surface S6 are both convex;

[0105] Aperture ST;

[0106] The fourth lens L4 has negative refractive power, and its object-side surface S7 and image-side surface S8 are both concave;

[0107] The fifth lens L5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex;

[0108] The sixth lens L6 has positive refractive power, its object-side surface S11 is convex, and its image-side surface S12 is concave;

[0109] The filter G1 has an object side surface S13 and an image side surface S14 that are both flat surfaces;

[0110] The filter G2 has an object side surface S15 and an image side surface S16 that are both flat.

[0111] The imaging surface S17 is a plane;

[0112] The relevant parameters of each lens in the optical lens in Example 1 are shown in Table 1-1.

[0113] Table 1-1

[0114]

[0115]

[0116] The surface parameters of the aspheric lens of the optical lens in Example 1 are shown in Table 1-2.

[0117] Table 1-2

[0118] Face number K A B C D E F S7 1.64E+00 0.00E+00 -2.66E-03 3.62E-05 -8.57E-06 -2.29E-06 1.42E-07 S8 6.54E+01 0.00E+00 3.23E-03 1.71E-06 1.45E-05 -4.22E-06 2.62E-07

[0119] Figure 2 The following figure shows the field curvature curve of Example 1, which shows the degree of curvature of light of different wavelengths in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: degrees). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within ±0.08mm, indicating that the optical lens can effectively correct field curvature.

[0120] Figure 3The following graph shows the F-Tanθ distortion curve for Example 1, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging plane. The horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the graph, the F-Tanθ distortion of the optical lens is uniformly controlled within ±50%, indicating that the F-Tanθ distortion of the optical lens is effectively controlled, facilitating subsequent processing using software algorithms.

[0121] Figure 4 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 80% at the maximum half field angle, indicating that the optical lens has excellent relative illumination.

[0122] Figure 5 A modulation transfer function (MTF) graph of Example 1 is shown, showing the degree of lens imaging modulation at different spatial frequencies across the field of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value of this embodiment is consistently above 0.3 across the entire field of view. Within the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating excellent imaging quality and detail resolution at both low and high frequencies.

[0123] Figure 6 The following graph shows the axial aberration curve for Example 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: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within ±25 μm, indicating that the optical lens can effectively correct axial aberration.

[0124] Figure 7 The vertical chromatic aberration curve for Example 1 is shown. It plots the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. As can be seen from the graph, the vertical chromatic aberration for both the longest and shortest wavelengths is controlled within ±3 μm, demonstrating that this optical lens is capable of excellently correcting chromatic aberration in the peripheral field of view and the secondary spectrum across the entire image plane.

[0125] Example 2

[0126] See also Figure 8, shown is a schematic structural diagram of the optical lens provided in Example 2 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, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter G1, and a protective glass G2.

[0127] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0128] The second lens L2 has negative refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0129] The third lens L3 has positive refractive power, and its object-side surface S5 and image-side surface S6 are both convex;

[0130] Aperture ST;

[0131] The fourth lens L4 has negative refractive power, its object-side surface S7 is convex, and its image-side surface S8 is concave;

[0132] The fifth lens L5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex;

[0133] The sixth lens L6 has positive refractive power, its object-side surface S11 is convex, and its image-side surface S12 is concave;

[0134] The filter G1 has an object side surface S13 and an image side surface S14 that are both flat surfaces;

[0135] The filter G2 has an object side surface S15 and an image side surface S16 that are both flat.

[0136] The imaging surface S17 is a plane;

[0137] The relevant parameters of each lens in the optical lens in Example 2 are shown in Table 2-1.

[0138] Table 2-1

[0139]

[0140] The surface parameters of the aspheric lens of the optical lens in Example 2 are shown in Table 2-2.

[0141] Table 2-2

[0142] Face number K A B C D E F S7 -1.43E+00 0.00E+00 1.17E-03 4.46E-05 -1.50E-06 1.06E-07 1.55E-09 S8 9.36E+01 0.00E+00 2.34E-03 -2.01E-04 5.16E-05 -5.14E-06 2.25E-07

[0143] Figure 9The following figure shows the field curvature curve of Example 2, which shows the degree of curvature of light of different wavelengths in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: degrees). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within ±0.08mm, indicating that the optical lens can effectively correct field curvature.

[0144] Figure 10 The following graph shows the F-Tanθ distortion curve for Example 2, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging plane. The horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the graph, the F-Tanθ distortion of the optical lens is uniformly controlled within ±50%, indicating that the F-Tanθ distortion of the optical lens is effectively controlled, facilitating subsequent processing using software algorithms.

[0145] Figure 11 A relative illumination curve for Example 2 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 80% at the maximum half field angle, indicating that the optical lens has excellent relative illumination.

[0146] Figure 12 A modulation transfer function (MTF) graph of Example 2 shows the degree of lens imaging modulation at different spatial frequencies across the field of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value of this embodiment is consistently above 0.3 across the entire field of view. Within the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating excellent imaging quality and detail resolution at both low and high frequencies.

[0147] Figure 13 The following graph shows the axial aberration curve for Example 2, which represents the aberration on the optical axis at the imaging plane for each wavelength. The horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within ±25 μm, indicating that the optical lens can effectively correct axial aberration.

[0148] Figure 14The vertical chromatic aberration curve for Example 2 is shown. It plots the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. As can be seen from the graph, the vertical chromatic aberration for both the longest and shortest wavelengths is controlled within ±4 μm, demonstrating that this optical lens is capable of excellently correcting chromatic aberration in the peripheral field of view and the secondary spectrum across the entire image plane.

[0149] Example 3

[0150] See also Figure 15 , shown is a schematic structural diagram of an optical lens provided in Example 3 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, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter G1, and a protective glass G2.

[0151] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0152] The second lens L2 has negative refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0153] The third lens L3 has positive refractive power, its object-side surface S5 is concave, and its image-side surface S6 is convex;

[0154] Aperture ST;

[0155] The fourth lens L4 has negative refractive power, its object-side surface S7 is convex, and its image-side surface S8 is concave;

[0156] The fifth lens L5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex;

[0157] The sixth lens L6 has positive refractive power, its object-side surface S11 is convex, and its image-side surface S12 is concave;

[0158] The filter G1 has an object side surface S13 and an image side surface S14 that are both flat surfaces;

[0159] The filter G2 has an object side surface S15 and an image side surface S16 that are both flat.

[0160] The imaging surface S17 is a plane;

[0161] The relevant parameters of each lens in the optical lens in Example 3 are shown in Table 3-1.

[0162] Table 3-1

[0163]

[0164] The surface parameters of the aspheric lens of the optical lens in Example 3 are shown in Table 3-2.

[0165] Table 3-2

[0166] Face number K A B C D E F S7 -7.40E+00 0.00E+00 5.25E-03 -4.31E-04 4.04E-05 -2.40E-06 6.66E-08 S8 5.85E+00 0.00E+00 1.68E-03 -1.69E-04 2.15E-05 -1.79E-06 -1.35E-08

[0167] Figure 16 The following is a graph of field curvature from Example 3, showing the degree of curvature of light at different wavelengths in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: degrees). As can be seen from the graph, the field curvature for both the meridional and sagittal image planes is controlled within ±0.08mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0168] Figure 17 The following graph shows the F-Tanθ distortion curve for Example 3, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging plane. The horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the graph, the F-Tanθ distortion of the optical lens is uniformly controlled within ±50%, indicating that the F-Tanθ distortion of the optical lens is effectively controlled, facilitating subsequent processing using software algorithms.

[0169] Figure 18 A relative illumination curve for Example 3 is shown, which shows the relative illumination values at different field angles on the imaging plane. The horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the graph, the relative illumination value of the optical lens is still greater than 70% at the maximum half field angle, indicating that the optical lens has excellent relative illumination.

[0170] Figure 19 A modulation transfer function (MTF) graph of Example 3 is shown, representing the degree of lens imaging modulation at different spatial frequencies across the field of view. The horizontal axis represents spatial frequency (lp / mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value of this embodiment is consistently above 0.3 across the entire field of view. Within the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating excellent imaging quality and detail resolution at both low and high frequencies.

[0171] Figure 20 The following graph shows the axial aberration curve for Example 3, which represents the aberration on the optical axis at the imaging plane for each wavelength. The horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within ±30 μm, indicating that the optical lens can effectively correct axial aberration.

[0172] Figure 21 The vertical chromatic aberration curve for Example 3 is shown. It plots the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. As can be seen from the graph, the vertical chromatic aberration for both the longest and shortest wavelengths is controlled within ±6 μm, demonstrating that this optical lens is capable of excellently correcting chromatic aberration in the peripheral field of view and the secondary spectrum across the entire image plane.

[0173] Example 4

[0174] See also Figure 22 , shown is a schematic structural diagram of an optical lens provided in Example 4 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, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter G1, and a protective glass G2.

[0175] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0176] The second lens L2 has negative power, its object-side surface S3 is convex, and its image-side surface S4 is concave; the third lens L3 has positive power, its object-side surface S5 is convex, and its image-side surface S6 is concave; the aperture ST;

[0177] The fourth lens L4 has negative refractive power, and its object-side surface S7 and image-side surface S8 are both concave;

[0178] The fifth lens L5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex;

[0179] The sixth lens L6 has positive refractive power, its object-side surface S11 is convex, and its image-side surface S12 is concave; the filter G1 has its object-side surface S13 and image-side surface S14 both flat.

[0180] The filter G2 has an object side surface S15 and an image side surface S16 that are both flat.

[0181] The imaging surface S17 is a plane;

[0182] The relevant parameters of each lens in the optical lens in Example 4 are shown in Table 4-1.

[0183] Table 4-1

[0184]

[0185] The surface parameters of the aspheric lens of the optical lens in Example 4 are shown in Table 4-2.

[0186] Table 4-2

[0187] Face number K A B C D E F S7 -1.79E+00 0.00E+00 1.34E-03 8.19E-06 5.51E-07 -1.54E-08 8.96E-10 S8 5.62E+01 0.00E+00 2.52E-03 -1.47E-04 4.87E-05 -5.00E-06 2.40E-07

[0188] Figure 23 The following figure shows the field curvature curve of Example 4, which shows the degree of curvature of light of different wavelengths in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: degrees). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within ±0.08mm, indicating that the optical lens can effectively correct field curvature.

[0189] Figure 24 The following graph shows the F-Tanθ distortion curve for Example 4, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging plane. The horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the graph, the F-Tanθ distortion of the optical lens is uniformly controlled within ±50%, indicating that the F-Tanθ distortion of the optical lens is effectively controlled, facilitating subsequent processing using software algorithms.

[0190] Figure 25 A relative illumination curve for Example 4 is shown, showing relative illumination values at different viewing angles on the imaging plane. The horizontal axis represents the half-viewing angle (unit: degrees), and the vertical axis represents the relative illumination (unit: %). As can be seen from the graph, the relative illumination value of the optical lens is still greater than 80% at the maximum half-viewing angle, indicating that the optical lens has excellent relative illumination.

[0191] Figure 26 A modulation transfer function (MTF) graph of Example 4 is shown, representing the degree of lens imaging modulation at different spatial frequencies across the field of view. The horizontal axis represents spatial frequency (lp / mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value of this embodiment is consistently above 0.3 across the entire field of view. Within the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating excellent imaging quality and detail resolution at both low and high frequencies.

[0192] Figure 27 The following graph shows the axial aberration curve for Example 4, which represents the aberration on the optical axis at the imaging plane for each wavelength. The horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within ±30 μm, indicating that the optical lens can effectively correct axial aberration.

[0193] Figure 28The vertical chromatic aberration curve for Example 4 is shown. It plots the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. As can be seen from the graph, the vertical chromatic aberration for both the longest and shortest wavelengths is controlled within ±3 μm, demonstrating that this optical lens is capable of excellently correcting chromatic aberration in the peripheral field of view and the secondary spectrum across the entire image plane.

[0194] Example 5

[0195] See also Figure 29 , shown is a schematic structural diagram of an optical lens provided in Example 5 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, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter G1, and a protective glass G2.

[0196] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0197] The second lens L2 has negative refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0198] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0199] Aperture ST;

[0200] The fourth lens L4 has negative refractive power, its object-side surface S7 is convex, and its image-side surface S8 is concave;

[0201] The fifth lens L5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex;

[0202] The sixth lens L6 has positive refractive power, its object-side surface S11 is convex, and its image-side surface S12 is concave;

[0203] The filter G1 has an object side surface S13 and an image side surface S14 that are both flat surfaces;

[0204] The filter G2 has an object side surface S15 and an image side surface S16 that are both flat.

[0205] The imaging surface S17 is a plane;

[0206] The relevant parameters of each lens in the optical lens in Example 5 are shown in Table 5-1.

[0207] Table 5-1

[0208]

[0209]

[0210] The surface parameters of the aspheric lens of the optical lens in Example 5 are shown in Table 5-2.

[0211] Table 5-2

[0212] Face number K A B C D E F S7 -2.33E+00 0.00E+00 1.70E-03 1.23E-05 -5.55E-07 1.03E-07 -1.23E-09 S8 1.48E+01 0.00E+00 2.37E-03 -1.66E-04 5.39E-05 -6.80E-06 3.67E-07

[0213] Figure 30 The following is a graph of field curvature for Example 5, showing the degree of curvature of light of different wavelengths in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: degrees). As can be seen from the graph, the field curvature in both the meridional and sagittal image planes is controlled within ±0.08mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0214] Figure 31 The following graph shows the F-Tanθ distortion curve for Example 5, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging plane. The horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the graph, the F-Tanθ distortion of the optical lens is uniformly controlled within ±50%, indicating that the F-Tanθ distortion of the optical lens is effectively controlled, facilitating subsequent processing using software algorithms.

[0215] Figure 32 A relative illumination curve for Example 5 is shown, which shows the relative illumination values at different field angles on the imaging plane. The horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the graph, the relative illumination value of the optical lens is still greater than 70% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0216] Figure 33 A modulation transfer function (MTF) curve for Example 5 is shown, representing the degree of lens imaging modulation at different spatial frequencies across the field of view. The horizontal axis represents spatial frequency (lp / mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value of this embodiment is consistently above 0.3 across the entire field of view. Within the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating excellent imaging quality and detail resolution at both low and high frequencies.

[0217] Figure 34The following graph shows the axial aberration curve for Example 5, which represents the aberration along the optical axis at the imaging plane for each wavelength. The horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within ±30 μm, indicating that the optical lens is able to effectively correct axial aberration.

[0218] Figure 35 The vertical chromatic aberration curve for Example 5 is shown. It shows the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. As can be seen from the graph, the vertical chromatic aberration for the longest and shortest wavelengths is controlled within ±5 μm, demonstrating that this optical lens is able to excellently correct chromatic aberration in the peripheral field of view and the secondary spectrum across the entire image plane.

[0219] Please refer to Table 6, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f, total optical length TTL, aperture number FNO, true image height IH, field of view FOV of the optical lens, and the numerical values corresponding to each conditional expression in the above embodiments.

[0220] Table 6

[0221]

[0222]

[0223] In summary, the optical lens of the embodiment of the present invention achieves the advantages of high contrast, excellent thermal stability, and low processing difficulty by reasonably matching the lens shapes and optical power combinations between the lenses.

[0224] 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.

[0225] 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: Along the optical axis from the object side to the imaging surface: a first lens having negative optical power, wherein the object-side surface is convex and the image-side surface is concave; a second lens having negative optical power, the object-side surface of which is convex and the image-side surface of which is concave; a third lens having positive optical power; Aperture; a fourth lens element having negative optical power and a concave image-side surface; a fifth lens element having positive optical power, whose object-side surface is convex and whose image-side surface is concave; a sixth lens element having positive optical power, whose object-side surface is convex and whose image-side surface is concave; The combined focal length f of the front lens of the optical lens aperture position 前 Combined focal length f of the lens behind the aperture position 后 Satisfy: f 前 / f 后 <-1.

0.

2. The optical lens according to claim 1, wherein: The total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle satisfy the following: TTL / IH<3.

0.

3. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy the following: 2.0<IH / f<2.

3.

4. The optical lens according to claim 1, wherein: The entrance pupil diameter EPD of the optical lens and the real image height IH corresponding to the maximum field angle satisfy the following: 3.8<IH / EPD<4.

0.

5. The optical lens according to claim 1, wherein: The maximum field of view FOV of the optical lens and the incident angle CRA of the principal ray of the maximum field of view on the image plane satisfy the following conditions: 2.5<(FOV / 2) / CRA<3.

8.

6. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -12.0<f2 / f<-3.

0.

7. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy the following: 3.0<f6 / f<4.

5.

8. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the object side curvature radius R of the sixth lens 11 and the image side curvature radius R 12 Satisfy respectively: 1.5<R 11 / f<1.8;2.5<R 12 / f<15.

0.

9. The optical lens according to claim 1, wherein: The sag of the sixth lens image side 12 and clear semi-aperture d 12 Satisfaction: 0.15<Sag 12 / d 12 <0.

30.

10. The optical lens according to claim 1, wherein: The total optical length TTL of the optical lens and the sum ΣCT of the center thicknesses of the first to sixth lenses along the optical axis respectively satisfy the following: 0.50<ΣCT / TTL<0.70.

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