Optical lens

Abstract

The present invention provides an optical lens having seven lenses, which, along the optical axis, from the object side to the imaging surface, include: a first lens having negative optical power, whose object side surface is convex and whose image side surface is concave; a second lens having negative optical power, whose object side surface is convex 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, whose object side surface is concave and whose image side surface is convex; a fifth lens having positive optical power, whose object side surface and image side surface are both convex; a sixth lens having negative optical power, whose object side surface and image side surface are both concave; and a seventh lens having positive optical power, whose object side surface and image side surface are both convex. The optical lens of the present invention has a large field of view and high resolution through the reasonable configuration of the surface shapes of the lenses and the reasonable matching of the optical powers, and has good imaging quality and clear imaging in the edge field of view.

Description

Technical Field

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

[0002] As people's requirements for driving experience continue to increase, automotive optical lenses are increasingly used in intelligent driving, and the status of automotive optical lenses in the automotive-related industries continues to improve.

[0003] Advanced Driver Assistance Systems (ADAS) play a crucial role in intelligent driving. They use various lenses and sensors to collect environmental information to ensure driver safety. Existing ADAS systems crop the image captured by the lens, resulting in a field of view that is approximately 70% to 80% of the lens's FOV. Therefore, during lens design, the requirements for image quality at the edges of the lens' FOV are relatively low. Summary of the Invention

[0004] In view of the above problems, the object of the present invention is to provide an optical lens having the advantages of a large field of view angle and good imaging effect of the edge field of view.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] An optical lens, comprising seven lenses, including the following elements in order from the object side to the imaging surface along the optical axis:

[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 element having positive optical power and a convex image-side surface;

[0010] a fourth lens element having negative optical power, whose object-side surface is concave and whose image-side surface is convex;

[0011] The fifth lens has positive refractive power, and both the object-side surface and the image-side surface are convex;

[0012] a sixth lens element having negative optical power, wherein both the object-side surface and the image-side surface are concave;

[0013] The seventh lens element has positive refractive power, and both the object-side surface and the image-side surface are convex;

[0014] The effective focal length f of the optical lens, the real image height IH corresponding to the maximum field of view angle, and the arc θ of the maximum half field of view angle satisfy the following conditions: (IH / 2) / (f×θ)≥1.3.

[0015] Further preferably, the total optical length TTL and the effective focal length f of the optical lens meet the following conditions: 14.0 <TTL / f<19.0。

[0016] Further preferably, the maximum field of view FOV and aperture value FNO of the optical lens meet the following requirements: 95° <FOV / FNO<135°。

[0017] Further preferably, the real image height IH corresponding to the maximum field angle of the optical lens and the real image height IHθ corresponding to the center half field angle satisfy: IHθ / IH≤0.45.

[0018] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -12.0 <f1 / f<-7.0。

[0019] Further preferably, the effective focal length f of the optical lens and the combined focal length f13 of the first lens, the second lens and the third lens satisfy: 4.0 <f13 / f<7.5。

[0020] 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: 0.35<(R1-R2) / (R1+R2)<0.55.

[0021] Further preferably, a curvature radius R3 of the object side surface of the second lens and a curvature radius R4 of the image side surface of the second lens satisfy: 0.35<(R3-R4) / (R3+R4)<0.65.

[0022] Further preferably, a curvature radius R5 of the object side surface of the third lens and a curvature radius R6 of the image side surface of the third lens satisfy: 0.6<(R5-R6) / (R5+R6)<2.8.

[0023] Further preferably, the semi-aperture sag height Sag3 of the object side surface of the second lens and the semi-aperture d3 of the object side surface of the second lens satisfy the following relationship: 0.05 <Sag3 / d3<0.3。

[0024] The optical lens provided by the present invention has a wide field of view and high resolution through the reasonable configuration of the surface shapes of each lens and the reasonable matching of the optical focal length, and has good imaging quality and clear imaging of the edge field of view. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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:

[0026] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0027] Figure 2 Graph showing the field curvature of the optical lens in Example 1 of the present invention.

[0028] Figure 3 : is the F-Theta distortion curve of the optical lens in Example 1 of the present invention.

[0029] Figure 4 This is a relative illumination curve diagram of the optical lens in Example 1 of the present invention.

[0030] Figure 5 This is the MTF curve of the optical lens in Example 1 of the present invention.

[0031] Figure 6 Graph showing the axial aberration of the optical lens in Example 1 of the present invention.

[0032] Figure 7 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0033] Figure 8 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0034] Figure 9 Graph showing the field curvature of the optical lens in Example 2 of the present invention.

[0035] Figure 10 : is the F-Theta distortion curve of the optical lens in Example 2 of the present invention.

[0036] Figure 11 This is a relative illumination curve diagram of the optical lens in Example 2 of the present invention.

[0037] Figure 12 This is an MTF curve diagram of the optical lens in Example 2 of the present invention.

[0038] Figure 13 2 is an axial aberration curve diagram of the optical lens in Example 2 of the present invention.

[0039] Figure 14 Graph showing vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0040] Figure 15 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0041] Figure 16 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0042] Figure 17 : This is the F-Theta distortion curve of the optical lens in Example 3 of the present invention.

[0043] Figure 18This is a relative illumination curve diagram of the optical lens in Example 3 of the present invention.

[0044] Figure 19 This is the MTF curve of the optical lens in Example 3 of the present invention.

[0045] Figure 20 Graph showing the axial aberration of the optical lens in Example 3 of the present invention.

[0046] Figure 21 Graph showing vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0047] Figure 22 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0048] Figure 23 4 is a field curvature curve diagram of the optical lens in Example 4 of the present invention.

[0049] Figure 24 : is the F-Theta distortion curve of the optical lens in Example 4 of the present invention.

[0050] Figure 25 This is a relative illumination curve diagram of the optical lens in Example 4 of the present invention.

[0051] Figure 26 This is the MTF curve of the optical lens in Example 4 of the present invention.

[0052] Figure 27 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0053] Figure 28 Graph showing vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0054] Figure 29 Schematic diagram of the structure of the optical lens in Example 5 of the present invention.

[0055] Figure 30 4 is a field curvature curve diagram of the optical lens in Example 5 of the present invention.

[0056] Figure 31 : is the F-Theta distortion curve of the optical lens in Example 5 of the present invention.

[0057] Figure 32 This is a relative illumination curve diagram of the optical lens in Example 5 of the present invention.

[0058] Figure 33 This is the MTF curve of the optical lens in Example 5 of the present invention.

[0059] Figure 34 4 is an axial aberration curve diagram of the optical lens in Example 5 of the present invention.

[0060] Figure 35 Graph showing vertical axis chromatic aberration of the optical lens in Example 5 of the present invention.

[0061] Figure 36 Schematic diagram of the structure of the optical lens in Example 6 of the present invention.

[0062] Figure 37 4 is a field curvature curve diagram of the optical lens in Example 6 of the present invention.

[0063] Figure 38 : This is the F-Theta distortion curve of the optical lens in Example 6 of the present invention.

[0064] Figure 39 This is a relative illumination curve diagram of the optical lens in Example 6 of the present invention.

[0065] Figure 40 This is the MTF curve of the optical lens in Example 6 of the present invention.

[0066] Figure 41 Graph showing the axial aberration of the optical lens in Example 6 of the present invention.

[0067] Figure 42 Graph showing vertical axis chromatic aberration of the optical lens in Example 6 of the present invention.

[0068] Figure 43 Schematic diagram of the structure of the optical lens in Example 7 of the present invention.

[0069] Figure 44 4 is a field curvature curve diagram of the optical lens in Example 7 of the present invention.

[0070] Figure 45 : This is the F-Theta distortion curve of the optical lens in Example 7 of the present invention.

[0071] Figure 46 This is a relative illumination curve diagram of the optical lens in Example 7 of the present invention.

[0072] Figure 47 This is the MTF curve of the optical lens in Example 7 of the present invention.

[0073] Figure 48 Graph showing the axial aberration of the optical lens in Example 7 of the present invention.

[0074] Figure 49 Graph showing vertical axis chromatic aberration of the optical lens in Example 7 of the present invention.

[0075] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0083] The optical lens according to an embodiment of the present invention sequentially includes, along the optical axis 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 seventh lens, and a filter. <gro

[0084] In some embodiments, the first lens may have a negative optical power, its object side is convex, and its image side is concave. The second lens may have a negative optical power, its object side is convex, and its image side is concave. The third lens may have a positive optical power, and its image side is convex. The fourth lens may have a negative optical power, its object side is concave, and its image side is convex. The fifth lens may have a positive optical power, and both its object side and image side are convex. The sixth lens may have a negative optical power, and both its object side and image side are concave. The seventh lens may have a positive optical power, and both its object side and image side are convex.

[0085] In some embodiments, the effective focal length f of the optical lens, the true image height IH corresponding to the maximum field angle, and the radian θ of the maximum half-field angle satisfy: (IH / 2) / (f×θ)≥1.3. Meeting the above range is beneficial to realizing the ultra-wide-angle characteristic of the optical lens, can effectively increase the proportion of the edge field of view of the optical lens in the entire image plane, and further improve the angular resolution of the edge field of view.

[0086] In some embodiments, the maximum field angle FOV of the optical lens satisfies: FOV>190°. Meeting the above range can realize the ultra-wide-angle characteristic of the optical lens.

[0087] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f satisfy: 14.0<TTL / f<19.0. Meeting the above range ensures that there is enough space to adjust the lens structure and optimize the imaging effect.

[0088] In some embodiments, the maximum field angle FOV of the optical lens and the aperture value FNO satisfy: 95°<FOV / FNO<135°. Meeting the above range enables the optical lens to match different specifications of aperture sizes, thereby better balancing the relationship between the field angle and the aperture size of the optical lens.

[0089] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL satisfy: 1.9<BFL / f<2.5. Meeting the above range is beneficial to achieving a balance between obtaining good imaging quality and an easily assembled back focal length, ensuring the imaging quality of the optical lens while avoiding interference between the lens and other components and reducing the assembly process difficulty of the camera module.

[0090] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the true image height IHθ corresponding to the central half-field angle satisfy: IHθ / IH ≤ 0.45. Meeting the above range can highlight the proportion of the imaging range of the edge field in the entire imaging range. Compared with lenses of the same field angle, when matching a chip of the same size, the proportion of the imaging range of the edge field in the entire imaging range is larger, and thus more detailed information can be obtained.

[0091] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -12.0 < f1 / f < -7.0. Meeting the above range is beneficial to forming a short focal length lens structure to allow large-angle light to enter the optical lens; at the same time, using a larger negative focal length helps to control perspective distortion and reduce field curvature, thereby improving the geometric accuracy of the imaging plane.

[0092] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -4.0 < f2 / f < -2.5. Meeting the above range enables the second lens to have an appropriate negative optical power, which can share the negative optical power of the first lens, allowing large-field-angle light to smoothly enter the optical lens to expand the light collection range.

[0093] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 3.8 < f3 / f < 5.2. Meeting the above range can make the third lens have an appropriate positive optical power, while converging light, reducing the light deflection angle, enabling the light trend to transition smoothly, and at the same time balancing various aberrations generated by the optical lens to improve the imaging quality of the optical lens.

[0094] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: f4 / f < -120.0. Meeting the above range is beneficial to correcting the field curvature of the optical lens, making the focal position differences of image points at different positions on the imaging plane smaller, and helping to improve the flatness of the image.

[0095] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 2.0 < f7 / f < 2.7. Meeting the above range can make the seventh lens have an appropriate positive optical power, which can enhance the light converging ability of the optical lens, shorten the total length of the optical lens. At the same time, it also optimizes the spherical aberration of the optical lens and improves the imaging quality of the optical lens.

[0096] In some embodiments, the effective focal length f of the optical lens and the combined focal length f13 of the first lens, the second lens, and the third lens satisfy: 4.0 < f13 / f < 7.5. The effective focal length f of the optical lens and the combined focal length f47 of the fourth lens, the fifth lens, the sixth lens, and the seventh lens satisfy: 3.2 < f47 / f < 4.2. By satisfying the above ranges, since the combined focal length of the lenses before the aperture is relatively large, spherical aberration and coma can be corrected more effectively. At the same time, since the combined focal length of the lenses after the aperture is relatively small, chromatic aberration can be better corrected, thereby improving the color reproducibility and color rendition of the optical lens.

[0097] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 0.35 < (R1 - R2) / (R1 + R2) < 0.55. By satisfying the above range, while ensuring that the optical lens has a large field angle, the light deflection angle is reduced as much as possible, reducing the difficulty of aberration correction for the light rays from the edge field angle.

[0098] In some embodiments, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 0.35 < (R3 - R4) / (R3 + R4) < 0.65. By satisfying the above range, the light deflection angle can be reduced, making the light path more stable. At the same time, coma and field curvature can be corrected, improving the flatness of the image and enhancing the imaging quality of the optical lens.

[0099] In some embodiments, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 0.6 < (R5 - R6) / (R5 + R6) < 2.8. By satisfying the above range, as much light as possible from the edge field of the second lens can be received, while being beneficial to the stable light path and reducing the aberration correction pressure of the lenses at the rear end of the optical lens.

[0100] In some embodiments, the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens satisfy: -6.8 < (R13 - R14) / (R13 + R14) < -2.0. By satisfying the above range, the optical lens has a small principal ray incident angle, thereby increasing the optical back focal length of the optical lens and further improving the imaging quality of the optical lens.

[0101] In some embodiments, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -32.0 < (R7 + R8) / (R7 - R8) < -8.5. By satisfying the above range, spherical aberration of the optical lens can be corrected, and at the same time, the influence of astigmatism on the imaging of the optical lens can be reduced.

[0102] In some embodiments, the sagittal height Sag3 of the clear aperture semi-diameter of the object side surface of the second lens and the clear aperture semi-diameter d3 of the object side surface of the second lens satisfy: 0.05 < Sag3 / d3 < 0.3. The sagittal height Sag4 of the clear aperture semi-diameter of the image side surface of the second lens and the clear aperture semi-diameter d4 of the image side surface of the second lens satisfy: 0.8 < Sag4 / d4 < 1.0. Meeting the above ranges can help control perspective distortion, reduce the perspective effect of the central field of view of the optical lens, and enhance the perspective effect of the peripheral field of view, thereby improving the imaging quality of the peripheral field of view.

[0103] In some embodiments, the fifth lens and the sixth lens can be glued together to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0104] To enable the system to have better optical performance, multiple aspherical lenses are used in the lens. The surface shapes of the aspherical surfaces of the optical lens satisfy the following equation:

[0105]

[0106] Where z is the distance between the curved surface and the vertex of the curved surface in the optical axis direction, h is the distance from the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the conic coefficient, and A, B, C, D, E, F, G, and H are the second-order, fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order surface coefficients respectively.

[0107] The present invention will be further described below with multiple embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are partially different. For specific differences, refer to the parameter tables of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be regarded as equivalent substitution methods and are included in the protection scope of the present invention.

[0108] Embodiment 1

[0109] Please refer to Figure 1 , which shows a schematic structural diagram of the optical lens provided in Embodiment 1 of the present invention. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0110] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0111] The second lens L2 has negative refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0112] The third lens L3 has positive refractive power, and its object-side surface S5 and image-side surface S6 are both convex;

[0113] Aperture ST;

[0114] The fourth lens L4 has negative optical power, its object-side surface S7 is concave, and its image-side surface S8 is convex;

[0115] The fifth lens L5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex;

[0116] The sixth lens L6 has negative refractive power, and its object-side surface S10 and image-side surface S11 are both concave;

[0117] The fifth lens L5 and the sixth lens L6 form a cemented lens group. That is, the cemented surface between the image-side surface of the fifth lens L5 and the object-side surface of the sixth lens L6 is S10.

[0118] The seventh lens L7 has positive refractive power, and its object-side surface S12 and image-side surface S13 are both convex;

[0119] The object-side surface S14 and the image-side surface S15 of the filter G1 are both flat surfaces;

[0120] The imaging surface S16 is a plane.

[0121] The relevant parameters of each lens in the optical lens in Example 1 are shown in Table 1-1.

[0122] Table 1-1

[0123]

[0124]

[0125] The surface parameters of the aspheric lens of the optical lens in Example 1 are shown in Table 1-2.

[0126] Table 1-2

[0127]

[0128] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 2 、 Figure 3 、 Figure 4 、 Figure 5、 Figure 6 、 Figure 7 shown.

[0129] Figure 2 The field curvature curves for Example 1 are shown, representing 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 a range of -0.05mm to 0.2mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0130] Figure 3 The F-Theta distortion curve for Example 1 is shown, representing the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface. The horizontal axis represents F-Theta distortion (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within 0-30%, and the image compression in the edge angle area is relatively smooth, effectively improving the clarity of the expanded image.

[0131] Figure 4 The relative illumination curve of Example 1 is shown, which represents 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 figure, the relative illumination value of the optical lens is still greater than 50% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0132] Figure 5 The MTF (Modulation Transfer Function) curve for Example 1 is shown. It shows the degree of lens imaging modulation at various field angles at different spatial frequencies. The horizontal axis represents the field angle (unit: degrees), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value at the edge of the field of view of this example is greater than 0.3 at a spatial frequency of 120 lp / mm, indicating that the optical lens maintains good imaging quality and good detail resolution at the edge of the field of view.

[0133] 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 a range of -30μm to 10μm, indicating that the optical lens can effectively correct axial aberration.

[0134] Figure 7The 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 a range of -4 μm to 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.

[0135] Example 2

[0136] See also Figure 8 , shown is a schematic structural diagram of the optical lens provided in Example 2 of the present invention. The optical lens of this embodiment is substantially the same as that of Example 1, with the main difference being that the optical parameters such as the curvature radius, aspheric coefficient, and thickness of each lens surface are different.

[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]

[0141] The surface parameters of the aspheric lens of the optical lens in Example 2 are shown in Table 2-2.

[0142] Table 2-2

[0143]

[0144]

[0145] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 shown.

[0146] Figure 9 The field curvature curves for Example 2 are shown, 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 figure, the field curvature of the meridional and sagittal image planes is controlled within -0.04mm to 0.07mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0147] Figure 10 The F-Theta distortion curve for Example 2 is shown, representing the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface. The horizontal axis represents F-Theta distortion (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within 0-30%, and the image compression in the edge angle area is relatively smooth, effectively improving the clarity of the expanded image.

[0148] Figure 11 The relative illumination curve of Example 2 is shown, which represents 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 figure, the relative illumination value of the optical lens is still greater than 40% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0149] Figure 12 The MTF (Modulation Transfer Function) curve for Example 2 is shown. It shows the degree of lens imaging modulation at various field angles at different spatial frequencies. The horizontal axis represents the field angle (unit: degrees), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value at the edge of the field of view of this example is greater than 0.3 at a spatial frequency of 120 lp / mm, indicating that the optical lens maintains good imaging quality and good detail resolution at the edge of the field of view.

[0150] 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 a range of -20 μm to 10 μm, indicating that the optical lens can effectively correct axial aberration.

[0151] Figure 14 The 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 a range of -2 μm to 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.

[0152] Example 3

[0153] See also Figure 15, shown is a schematic structural diagram of the optical lens provided in Example 3 of the present invention. The optical lens of this embodiment is substantially the same as that of Example 1, with the main difference being that the optical parameters such as the curvature radius, aspheric coefficient, and thickness of each lens surface are different.

[0154] The relevant parameters of each lens in the optical lens in Example 3 are shown in Table 3-1.

[0155] Table 3-1

[0156]

[0157] The surface parameters of the aspheric lens of the optical lens in Example 3 are shown in Table 3-2.

[0158] Table 3-2

[0159]

[0160]

[0161] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 16 、 Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 、 Figure 21 shown.

[0162] Figure 16 The field curvature curves for Example 3 are shown, 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 figure, the field curvature of the meridional and sagittal image planes is controlled within a range of -0.04mm to 0.04mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0163] Figure 17 The F-Theta distortion curve for Example 3 is shown, representing the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface. The horizontal axis represents F-Theta distortion (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within 0-40%, and the image compression in the edge angle area is relatively smooth, effectively improving the clarity of the expanded image.

[0164] Figure 18The relative illumination curve of Example 3 is shown, which represents 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 figure, the relative illumination value of the optical lens is still greater than 40% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0165] Figure 19 The MTF (Modulation Transfer Function) curve for Example 3 is shown. It shows the degree of lens imaging modulation at various field angles at different spatial frequencies. The horizontal axis represents the field angle (unit: degrees), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value at the edge of the field of view of this example is greater than 0.3 at a spatial frequency of 120 lp / mm, indicating that the optical lens maintains good imaging quality and good detail resolution at the edge of the field of view.

[0166] 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 a range of -10μm to 15μm, indicating that the optical lens can effectively correct axial aberration.

[0167] 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 a range of -3 μm to 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.

[0168] Example 4

[0169] See also Figure 22 , shown is a schematic structural diagram of the optical lens provided in Example 4 of the present invention. The optical lens of this embodiment is substantially the same as that of Example 1, with the main difference being that the optical parameters such as the curvature radius, aspheric coefficient, and thickness of each lens surface are different.

[0170] The relevant parameters of each lens in the optical lens in Example 4 are shown in Table 4-1.

[0171] Table 4-1

[0172]

[0173] The surface parameters of the aspheric lens of the optical lens in Example 4 are shown in Table 4-2.

[0174] Table 4-2

[0175]

[0176]

[0177] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 23 、 Figure 24 、 Figure 25 、 Figure 26 、 Figure 27 、 Figure 28 shown.

[0178] Figure 23 The field curvature curves for Example 4 are shown, 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 figure, the field curvature of the meridional and sagittal image planes is controlled within a range of -0.04mm to 0.04mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0179] Figure 24 The F-Theta distortion curve for Example 4 is shown. It represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface. The horizontal axis represents F-Theta distortion (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within 0-40%, and the image compression at the edge angles is relatively smooth, effectively improving the clarity of the expanded image.

[0180] Figure 25 The relative illumination curve of Example 4 is shown, which represents 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 figure, the relative illumination value of the optical lens is still greater than 40% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0181] Figure 26 The MTF (Modulation Transfer Function) curve for Example 4 is shown. It shows the degree of lens imaging modulation at various field angles at different spatial frequencies. The horizontal axis represents the field angle (unit: degrees), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value at the edge of the field of view of this example is greater than 0.3 at a spatial frequency of 120 lp / mm, indicating that the optical lens maintains good imaging quality and good detail resolution at the edge of the field of view.

[0182] Figure 27The 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 a range of -20μm to 10μm, indicating that the optical lens can effectively correct axial aberration.

[0183] Figure 28 The 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 a range of -3 μm to 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.

[0184] Example 5

[0185] See also Figure 29 , shown is a schematic structural diagram of the optical lens provided in Example 5 of the present invention. The optical lens of this embodiment is substantially the same as that of Example 1, with the main difference being that the object-side surface S5 of the third lens L3 is concave, and the optical parameters such as the curvature radius, aspheric coefficient, and thickness of each lens surface are different.

[0186] The relevant parameters of each lens in the optical lens in Example 5 are shown in Table 5-1.

[0187] Table 5-1

[0188]

[0189]

[0190] The surface parameters of the aspheric lens of the optical lens in Example 5 are shown in Table 5-2.

[0191] Table 5-2

[0192]

[0193] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 30 、 Figure 31 、 Figure 32 、 Figure 33 、 Figure 34 、 Figure 35 shown.

[0194] Figure 30The field curvature curves for Example 5 are shown, 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 figure, the field curvature of the meridional and sagittal image planes is controlled within -0.04mm to 0.03mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0195] Figure 31 The F-Theta distortion curve for Example 5 is shown. It represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface. The horizontal axis represents F-Theta distortion (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within 0-40%, and the image compression at the edge angles is relatively smooth, effectively improving the clarity of the expanded image.

[0196] Figure 32 The relative illumination curve of Example 5 is shown, which represents the relative illumination values ​​at different field angles on the imaging surface. The horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 30% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0197] Figure 33 The MTF (Modulation Transfer Function) curve for Example 5 is shown, showing the degree of lens imaging modulation at various field angles at different spatial frequencies. The horizontal axis represents the field angle (unit: degrees), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value at the edge of the field of view of this example is greater than 0.3 at a spatial frequency of 120 lp / mm, indicating that the optical lens maintains good imaging quality and good detail resolution at the edge of the field of view.

[0198] Figure 34 The following graph shows the axial aberration curve for Example 5, 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 a range of -25μm to 10μm, indicating that the optical lens is able to effectively correct axial aberration.

[0199] Figure 35 The vertical chromatic aberration curve for Example 5 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 a range of -2 μm to 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.

[0200] Example 6

[0201] See also Figure 36 , shown is a schematic structural diagram of the optical lens provided in Example 6 of the present invention. The optical lens of this embodiment is substantially the same as that of Example 1, with the main difference being that the object-side surface S5 of the third lens L3 is concave, and the optical parameters such as the curvature radius, aspheric coefficient, and thickness of each lens surface are different.

[0202] The relevant parameters of each lens in the optical lens in Example 6 are shown in Table 6-1.

[0203] Table 6-1

[0204]

[0205]

[0206] The surface parameters of the aspheric lens of the optical lens in Example 6 are shown in Table 6-2.

[0207] Table 6-2

[0208]

[0209] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 37 、 Figure 38 、 Figure 39 、 Figure 40 、 Figure 41 、 Figure 42 shown.

[0210] Figure 37 The field curvature curves for Example 6 are shown, 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 figure, the field curvature of the meridional and sagittal image planes is controlled within a range of -0.04mm to 0.06mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0211] Figure 38 The F-Theta distortion curve for Example 6 is shown. It represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface. The horizontal axis represents F-Theta distortion (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within 0-30%, and the image compression at the edge angles is relatively smooth, effectively improving the clarity of the expanded image.

[0212] Figure 39 The relative illumination curve of Example 6 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 figure, the relative illumination value of the optical lens is still greater than 40% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0213] Figure 40 The MTF (Modulation Transfer Function) curve for Example 6 is shown. It shows the degree of lens imaging modulation at various field angles at different spatial frequencies. The horizontal axis represents the field angle (unit: degrees), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value at the edge of the field of view of this example is greater than 0.3 at a spatial frequency of 120 lp / mm, indicating that the optical lens maintains good imaging quality and good detail resolution at the edge of the field of view.

[0214] Figure 41 The following graph shows the axial aberration curve for Example 6, which plots 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 a range of -15 μm to 10 μm, demonstrating that the optical lens is capable of effectively correcting axial aberration.

[0215] Figure 42 The vertical chromatic aberration curve for Example 6 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 a range of -3 μm to 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.

[0216] Example 7

[0217] See also Figure 43 , shown is a schematic structural diagram of an optical lens provided in Example 7 of the present invention. The optical lens of this embodiment is substantially the same as that of Example 1, with the main difference being that the object-side surface S5 of the third lens L3 is concave, and the optical parameters such as the curvature radius, aspheric coefficient, and thickness of each lens surface are different.

[0218] The relevant parameters of each lens in the optical lens in Example 7 are shown in Table 7-1.

[0219] Table 7-1

[0220]

[0221]

[0222] The surface parameters of the aspheric lens of the optical lens in Example 7 are shown in Table 7-2.

[0223] Table 7-2

[0224]

[0225] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 44 、 Figure 45 、 Figure 46 、 Figure 47 、 Figure 48 、 Figure 49 shown.

[0226] Figure 44 The field curvature curves for Example 7 are shown, 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 figure, the field curvature of the meridional and sagittal image planes is controlled within -0.05mm to 0.06mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0227] Figure 45 The F-Theta distortion curve for Example 7 is shown. It represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface. The horizontal axis represents F-Theta distortion (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within 0-40%, and the image compression at the edge angles is relatively smooth, effectively improving the clarity of the expanded image.

[0228] Figure 46 The relative illumination curve of Example 7 is shown, which represents 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 figure, the relative illumination value of the optical lens is still greater than 30% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0229] Figure 47 The MTF (Modulation Transfer Function) curve for Example 7 is shown, showing the degree of lens imaging modulation at various field angles at different spatial frequencies. The horizontal axis represents the field angle (unit: degrees), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value at the edge of the field of view of this example is greater than 0.3 at a spatial frequency of 120 lp / mm, indicating that the optical lens maintains good imaging quality and good detail resolution at the edge of the field of view.

[0230] Figure 48 The following graph shows the axial aberration curve for Example 7, which plots 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 a range of -15 μm to 10 μm, demonstrating that the optical lens is capable of effectively correcting axial aberration.

[0231] Figure 49 The vertical chromatic aberration curve for Example 7 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 a range of -2 μm to 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.

[0232] Please refer to Table 8, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f, total optical length TTL, aperture value FNO, true image height IH, chief ray incidence angle CRA and maximum field of view FOV of the optical lens, as well as the numerical values ​​corresponding to each conditional expression in each embodiment.

[0233] Table 8

[0234]

[0235]

[0236] In summary, the optical lens provided by the present invention has a wide field of view and high resolution through the reasonable configuration of the surface shapes of each lens and the reasonable matching of the optical power, and has good imaging quality. The imaging quality at the edge of the field of view is improved, making the edge field of view image clear.

[0237] 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.

[0238] 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 seven lenses, characterized in that: Along the optical axis from the object side to the imaging surface, it includes: 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 element having positive optical power and a convex image-side surface; a fourth lens element having negative optical power, whose object-side surface is concave and whose image-side surface is convex; The fifth lens has positive refractive power, and both the object-side surface and the image-side surface are convex; a sixth lens element having negative optical power, wherein both the object-side surface and the image-side surface are concave; The seventh lens element has positive refractive power, and both the object-side surface and the image-side surface are convex; The effective focal length f of the optical lens, the real image height IH corresponding to the maximum field of view angle, and the arc θ of the maximum half field of view angle satisfy the following conditions: 1.4 ≥ (IH / 2) / (f×θ) ≥ 1.3; The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -12.0 <f1 / f<-7.0。 2. The optical lens according to claim 1, wherein: The total optical length TTL and effective focal length f of the optical lens meet the following requirements: 14.0 <TTL / f<19.0。 3. The optical lens according to claim 1, wherein: The maximum field of view FOV and aperture value FNO of the optical lens meet the following requirements: 95° <FOV / FNO<135°。 4. The optical lens according to claim 1, wherein: The real image height IH corresponding to the maximum field angle of the optical lens and the real image height IHθ corresponding to the central half field angle satisfy: 0.41≤IHθ / IH≤0.

45.

5. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the combined focal length f13 of the first lens, the second lens and the third lens satisfy: 4.0 <f13 / f<7.5。 6. The optical lens according to claim 1, wherein: The object-side curvature radius R1 of the first lens and the image-side curvature radius R2 of the first lens satisfy the following relationship: 0.35<(R1-R2) / (R1+R2)<0.

55.

7. The optical lens according to claim 1, wherein: The object-side curvature radius R3 of the second lens and the image-side curvature radius R4 of the second lens satisfy the following relationship: 0.35<(R3-R4) / (R3+R4)<0.

65.

8. The optical lens according to claim 1, wherein: The object-side curvature radius R5 of the third lens and the image-side curvature radius R6 of the third lens satisfy the following relationship: 0.6<(R5-R6) / (R5+R6)<2.

8.

9. The optical lens according to claim 1, wherein: The object side semi-aperture sag height Sag3 of the second lens and the object side semi-aperture d3 of the second lens meet the following conditions: 0.05 <Sag3 / d3<0.3。

Images