Optical lens

Abstract

The present invention provides an optical lens, which includes, from the object side to the imaging surface along the optical axis: a first lens with positive optical power, whose object side surface is convex and whose image side surface is concave; a second lens with negative optical power, whose object side surface is convex and whose image side surface is concave; a third lens with positive optical power, whose object side surface is convex at the near optical axis and whose image side surface is concave at the near optical axis; a fourth lens with negative optical power, whose object side surface is concave and whose image side surface is convex; a fifth lens with positive optical power, whose object side surface is convex at the near optical axis and whose image side surface is convex; a sixth lens with positive optical power, whose object side surface is convex at the near optical axis; a seventh lens with negative optical power, whose object side surface is concave and whose image side surface is concave at the near optical axis. The optical lens provided by the present invention can improve the imaging quality of the optical lens, reduce aberrations at the near optical axis, and has the advantages of excellent imaging quality through specific surface shape setting and reasonable optical power distribution.

Description

Technical Field

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

[0002] With the rapid development of smartphone technology, consumers' demands for the performance of mobile phone cameras are constantly increasing. A large aperture and a large image plane can bring a larger light input and better image quality. At the same time, for the portability and aesthetics of mobile phones, the imaging lens is also required to have a thin, light, short and small shape, which doubles the difficulty of lens design. How to meet the requirements of a large aperture and high pixels while maintaining the miniaturization of the lens is also a difficulty in lens design at the present stage. Summary of the Invention

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

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

[0005] An optical lens, comprising a total of seven lenses, which successively include from the object side to the imaging plane along the optical axis:

[0006] A first lens with positive optical power, whose object side is convex and whose image side is concave;

[0007] A second lens with negative optical power, whose object side is convex and whose image side is concave;

[0008] A third lens with positive optical power, whose object side is convex near the optical axis and whose image side is concave near the optical axis;

[0009] A fourth lens with negative optical power, whose object side is concave and whose image side is convex;

[0010] A fifth lens with positive optical power, whose object side is convex near the optical axis and whose image side is convex;

[0011] A sixth lens with positive optical power, whose object side is convex near the optical axis;

[0012] A seventh lens with negative optical power, whose object side is concave and whose image side is concave near the optical axis;

[0013] Wherein, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -3.5 < f4 / f5 < -1.2; the curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: -3.3 < (R9 - R10) / (R9 + R10) < -2.2.

[0014] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.1 < TTL / f < 1.2; the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.6 < TTL / IH < 0.7.

[0015] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.75 < f1 / f < 0.95; the focal length f2 of the second lens and the focal length f1 of the first lens satisfy: -2.35 < f2 / f1 < -1.7.

[0016] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -2 < f2 / f < -1.4; the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: 3.3 < R3 / R4 < 6.7.

[0017] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: f3 / f > 5; the curvature radius R5 of the object side of the third lens and the curvature radius R6 of the image side of the third lens satisfy: (R5 + R6) / (R5 - R6) < -6.

[0018] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -8.1 < f4 / f < -3; the curvature radius R7 of the object side of the fourth lens and the curvature radius R8 of the image side of the fourth lens satisfy: -0.4 < (R7 - R8) / (R7 + R8) < 0.

[0019] Further preferably, the effective focal length f of the optical lens and the curvature radius R7 of the object side of the fourth lens satisfy: -1.2 < R7 / f < -0.8; the effective focal length f of the optical lens and the curvature radius R8 of the image side of the fourth lens satisfy: -1.8 < R8 / f < -1.3.

[0020] Further preferably, the effective focal length f of the optical lens and the curvature radius R9 of the object side of the fifth lens satisfy: 1.6 < R9 / f < 2; the effective focal length f of the optical lens and the curvature radius R10 of the image side of the fifth lens satisfy: -5 < R10 / f < -3.3.

[0021] Further preferably, the effective focal length f of the optical lens and the curvature radius R11 of the object side of the sixth lens satisfy: 0.65 < R11 / f < 0.85; the effective focal length f of the optical lens and the curvature radius R12 of the image side of the sixth lens satisfy: 8 < |R12 / f| < 48.

[0022] Further preferably, the sagittal height Sag9 of the clear aperture on the object side of the fifth lens and the clear aperture diameter d9 of the object side of the fifth lens satisfy: -0.2 < Sag9 / d9 < 0; the sagittal height Sag10 of the clear aperture on the image side of the fifth lens and the clear aperture diameter d10 of the image side of the fifth lens satisfy: -0.3 < Sag10 / d10 < -0.1.

[0023] Compared with the prior art, the optical lens provided by the present invention adopts seven lenses with specific optical powers. Through specific surface shape settings and reasonable optical power distributions, the lens can simultaneously have the characteristics of a large image plane and a large aperture. The large image plane helps to improve the resolution of the lens, and the large aperture enables the lens to have excellent imaging quality even in a dark environment at night. Description of the Drawings

[0024] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, where:

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

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

[0027] Figure 3 It is an F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 1 of the present invention.

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

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

[0030] Figure 6 It is a schematic structural diagram of the optical lens in Embodiment 2 of the present invention.

[0031] Figure 7 It is a field curvature curve graph of the optical lens in Embodiment 2 of the present invention.

[0032] Figure 8 It is an F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 2 of the present invention.

[0033] Fig. 9 It is a lateral chromatic aberration curve graph of the optical lens in Embodiment 2 of the present invention.

[0034] Fig.10 It is an axial aberration curve graph of the optical lens in Embodiment 2 of the present invention.

[0035] Fig.11 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0036] Fig.12 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0037] Fig.13 : is the F-Tan (Theta) distortion curve of the optical lens in Example 3 of the present invention.

[0038] Fig.14 Graph showing the vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0039] Fig.15 Graph showing the axial aberration of the optical lens in Embodiment 3 of the present invention.

[0040] Fig.16 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0041] Fig.17 It is a field curvature curve diagram of the optical lens in Example 4 of the present invention.

[0042] Fig.18 : is the F-Tan (Theta) distortion curve of the optical lens in Example 4 of the present invention.

[0043] Fig.19 Graph showing the vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0044] Fig. 20 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0045] Fig.21 Schematic diagram of the structure of the optical lens in Example 5 of the present invention.

[0046] Fig. 22 4 is a field curvature curve diagram of the optical lens in Example 5 of the present invention.

[0047] Fig.23 : is the F-Tan (Theta) distortion curve of the optical lens in Example 5 of the present invention.

[0048] Fig.24 Graph showing the vertical axis chromatic aberration of the optical lens in Example 5 of the present invention.

[0049] Fig.25 Graph showing the axial aberration of the optical lens in Embodiment 5 of the present invention.

[0050] Fig.26 Schematic diagram of the structure of the optical lens in Example 6 of the present invention.

[0051] Fig. 27 4 is a field curvature curve diagram of the optical lens in Example 6 of the present invention.

[0052] Fig.28 : is the F-Tan (Theta) distortion curve of the optical lens in Example 6 of the present invention.

[0053] Fig.29 Graph showing the vertical axis chromatic aberration of the optical lens in Example 6 of the present invention.

[0054] Fig.30 Graph showing the axial aberration of the optical lens in Embodiment 6 of the present invention.

[0055] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0056] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the embodiments of the present application, and 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.

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

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

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

[0060] 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 exclude 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 listed 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.

[0061] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0062] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0063] The optical lens provided by the embodiment of the present invention comprises seven lenses in total, which include, in sequence from the object side to the imaging surface along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens.

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

[0065] In some embodiments, the optical lens may further include an aperture, and the aperture may be located between the object side and the first lens. It is understood that the aperture is used to limit the amount of incoming light to change the brightness of the image.

[0066] In some embodiments, the optical lens may further include a filter, which may be disposed between the seventh lens and the imaging surface. The filter is used to filter out interfering light and prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0067] In some embodiments, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -3.5 < f4 / f5 < -1.2; the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: -3.3 < (R9 - R10) / (R9 + R10) < -2.2. Satisfying the above ranges is beneficial to the smooth transition of light rays, while correcting various aberrations of the optical lens, improving the relative illumination of the edge field of view, and enhancing the imaging quality of the optical lens. More specifically, -3.2 < f4 / f5 < -1.36; -3.02 < (R9 - R10) / (R9 + R10) < -2.39.

[0068] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.1 < TTL / f < 1.2; the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.6 < TTL / IH < 0.7. Satisfying the above ranges is beneficial to shortening the overall length of the optical lens while taking into account good imaging quality, realizing the miniaturization of the optical lens, and meeting the requirements of miniaturization and large image surface in mobile phone application scenarios. More specifically, 1.15 < TTL / f < 1.17; 0.62 < TTL / IH < 0.64.

[0069] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.75 < f1 / f < 0.95; the focal length f2 of the second lens and the focal length f1 of the first lens satisfy: -2.35 < f2 / f1 < -1.7. Satisfying the above ranges, by setting the first lens to have a relatively large positive refractive power and the focal length ratio of the second lens to the first lens, the incident light rays can be converged to a greater extent, and more light rays can enter the system, which is beneficial to improving the light input of the lens, realizing the large aperture performance of the lens, and enabling the lens to achieve high-definition imaging in a relatively dark environment. More specifically, 0.82 < f1 / f < 0.85; -2.16 < f2 / f1 < -1.88.

[0070] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -2 < f2 / f < -1.4; the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: 3.3 < R3 / R4 < 6.7. Meeting the above ranges, by reasonably allocating the focal length and surface shape of the second lens, it is possible to avoid excessive light deflection caused by overly concentrated optical power of the first lens, and reduce the difficulty of aberration correction. More specifically, -1.81 < f2 / f < -1.58; 3.72 < R3 / R4 < 6.13.

[0071] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: f3 / f > 5; the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: (R5 + R6) / (R5 - R6) < -6. Meeting the above ranges can endow the third lens with appropriate positive optical power and surface shape, which is conducive to the smooth transition of light, reduces the tolerance sensitivity, and is beneficial to manufacturing. More specifically, 5.35 < f3 / f < 54.73; -118.28 < (R5 + R6) / (R5 - R6) < -6.39.

[0072] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -8.1 < f4 / f < -3; the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: -0.4 < (R7 - R8) / (R7 + R8) < 0. Meeting the above ranges can endow the fourth lens with appropriate negative optical power and surface shape, which is conducive to reasonably controlling the light trend, reducing aberrations, and improving the imaging quality of the optical lens. More specifically, -7.39 < f4 / f < -3.32; -0.29 < (R7 - R8) / (R7 + R8) < -0.13.

[0073] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R7 of the object side surface of the fourth lens satisfy: -1.2 < R7 / f < -0.8; the effective focal length f of the optical lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: -1.8 < R8 / f < -1.3. Meeting the above ranges, by reasonably controlling the surface shape of the fourth lens, the spherical aberration contribution of the fourth lens can be controlled within a reasonable range, enabling the lens to have a high axial imaging resolution ability, which is conducive to achieving high-definition imaging of the lens. More specifically, -1.1 < R7 / f < -0.89; -1.65 < R8 / f < -1.42.

[0074] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R9 of the object side surface of the fifth lens satisfy: 1.6 < R9 / f < 2; the effective focal length f of the optical lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -5 < R10 / f < -3.3. Meeting the above ranges, by reasonably controlling the surface shape of the fifth lens, it is beneficial to further converge the light rays, enabling the divergent light rays to smoothly enter the subsequent optical system and better achieving high-quality imaging of the lens. More specifically, 1.71 < R9 / f < 1.88; -4.56 < R10 / f < -3.64.

[0075] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R11 of the object side surface of the sixth lens satisfy: 0.65 < R11 / f < 0.85; the effective focal length f of the optical lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: 8 < |R12 / f| < 48. Meeting the above ranges, by reasonably controlling the surface shape of the sixth lens, it helps to reasonably control the light ray trend, correct astigmatism and distortion, and improve the imaging quality of the optical lens. More specifically, 0.71 < R11 / f < 0.78; 8.28 < |R12 / f| < 43.94.

[0076] In some embodiments, the sagittal height Sag9 of the clear aperture of the object side surface of the fifth lens and the clear aperture d9 of the object side surface of the fifth lens satisfy: -0.2 < Sag9 / d9 < 0; the sagittal height Sag10 of the clear aperture of the image side surface of the fifth lens and the clear aperture d10 of the image side surface of the fifth lens satisfy: -0.3 < Sag10 / d10 < -0.1. Meeting the above ranges helps to control the light ray trend of the edge field of view, reduce aberration, and is also beneficial for lens manufacturing and processing. More specifically, -0.11 < Sag9 / d9 < -0.08; -0.21 < Sag10 / d10 < -0.18.

[0077] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV, and the true image height IH corresponding to the maximum field of view satisfy: 1 < (IH / 2) / (f × tan(FOV / 2)) < 1.03. Meeting the above range can control the size of distortion and improve the imaging quality of the optical lens. More specifically, 1.01 < (IH / 2) / (f × tan(FOV / 2)) < 1.03.

[0078] 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 of the optical lens satisfy: 1.8 < IH / f < 1.9. Meeting the above range and reasonably controlling the relationship between the image height and the focal length helps the optical lens to achieve high pixel characteristics. More specifically, 1.83 < IH / f < 1.86.

[0079] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL satisfy: 0.1 < BFL / f < 0.2. Meeting the above range can make the lens have an appropriate back focus, which is beneficial to the assembly of the module, reduces interference, and improves the production yield. More specifically, 0.14 < BFL / f < 0.16.

[0080] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2 < f5 / f < 2.7. Meeting the above range can make the fifth lens have a positive optical power, which helps to reasonably control the light trend, reduce aberration, and improve the imaging quality of the optical lens. More specifically, 2.22 < f5 / f < 2.45.

[0081] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1.2 < f6 / f < 1.6. Meeting the above range can make the sixth lens have a positive optical power, which is beneficial to balancing various aberrations brought by the front optical system and improving the imaging quality of the optical lens. More specifically, 1.34 < f6 / f < 1.46.

[0082] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -0.75 < f7 / f < -0.55. Meeting the above range can make the seventh lens have a negative optical power, which is beneficial to increasing the imaging area and field of view angle of the optical lens and improving the imaging quality of the optical lens. More specifically, -0.69 < f7 / f < -0.66.

[0083] In some embodiments, the effective focal length f of the optical lens and the combined focal length f12 of the first lens and the second lens satisfy: 1.15 < f12 / f < 1.6. Meeting the above range, the positive and negative lens combination of the first lens and the second lens can cancel out the aberrations generated by each other, improve the imaging resolution of the optical lens, and thus obtain high-quality imaging. More specifically, 1.29 < f12 / f < 1.43.

[0084] In some embodiments, the effective focal length f of the optical lens and the combined focal length f23 of the second lens and the third lens satisfy: -2.5 < f23 / f < -1.6. Meeting the above range helps to ensure a reasonable distribution of the optical power of the optical lens and reduce the tolerance sensitivity. More specifically, -2.34 < f23 / f < -1.82.

[0085] In some embodiments, the effective focal length f of the optical lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy: 2.9 < f45 / f < 8.9. Meeting the above range helps to ensure a reasonable distribution of the optical power of the optical lens and can reduce aberration. More specifically, 3.25 < f45 / f < 8.11.

[0086] In some embodiments, the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: -33 < f3 / f2 < -3. Meeting the above range can make the light path stable, contribute to balancing the aberration of the optical lens, reducing the tolerance sensitivity, and improving the imaging quality. More specifically, -30.36 < f3 / f2 < -3.28.

[0087] In some embodiments, the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: |R11 / R12| < 0.15. Meeting the above range helps to reasonably control the light path, correct astigmatism and distortion, and improve the imaging quality of the optical lens. More specifically, -0.05 < R11 / R12 < 0.1.

[0088] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis and the sum ∑AT of the spacing distances between any two lenses along the optical axis satisfy: 1.15 < ∑CT / ∑AT < 1.5. Meeting the above range provides sufficient spacing space for the system, with a higher degree of freedom in the change of the lens surface, thereby enabling the optical lens to obtain stronger image quality. More specifically, 1.28 < ∑CT / ∑AT < 1.38.

[0089] In some embodiments, the spacing distance CT56 between the fifth lens and the sixth lens along the optical axis and the central thickness CT5 of the fifth lens satisfy: 0.9 < CT56 / CT5 < 1.7; the spacing distance CT56 between the fifth lens and the sixth lens along the optical axis and the total optical length TTL of the optical lens satisfy: 0.05 < CT56 / TTL < 0.15. Meeting the above range is conducive to the structural design and production process of the optical lens on the premise of ensuring the imaging quality of the lens. More specifically, 0.96 < CT56 / CT5 < 1.53; 0.07 < CT56 / TTL < 0.11.

[0090] In some embodiments, the optical lens satisfies the conditional formula: 6.2 mm < f < 7.4 mm, 80° < FOV < 90°, 3.6 mm < EPD < 4.5 mm, 7.5 mm < TTL < 8.5 mm, 1.5 < Fno < 1.8, 12 mm < IH < 13 mm; where f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, Fno represents the aperture value of the optical lens, and IH represents the image height corresponding to the maximum field of view angle of the optical lens. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention has at least the characteristics of small volume, large image plane, and large aperture. More specifically, 6.86 mm < f < 6.88 mm, 84.25° < FOV < 84.31°, 4.08 mm < EPD < 4.11 mm, 7.98 mm < TTL < 8.01 mm, 1.66 < Fno < 1.68, 12.64 mm < IH < 12.71 mm.

[0091] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. On the other hand, when the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens in the optical lens provided by the present invention are all plastic lenses.

[0092] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can be spherical lenses or aspherical lenses. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens. More specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens of the present invention can all be aspherical lenses, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens.

[0093] In each embodiment of the present invention, when the lens is an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equation:

[0094] ;

[0095] Among them, z is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis, c is the curvature of the vertex of the surface, K is the quadratic surface coefficient, B, C, D, E, F, G, H, I, and J are the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, sixteenth-order, eighteenth-order, and twentieth-order surface coefficients respectively.

[0096] The present invention is further described below in multiple embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different. For specific differences, please refer to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any other changes, substitutions, combinations or simplifications that do not deviate from the innovative points of the present invention should be regarded as equivalent replacement methods and are included in the protection scope of the present invention.

[0097] Example 1

[0098] See also Figure 1 , shown is a schematic diagram of the structure of the optical lens 100 provided in Example 1 of the present invention, and the optical lens 100 includes, along the optical axis from the object side to the imaging surface, an aperture ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter G1.

[0099] The first lens L1 has positive refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0100] The second lens L2 has negative refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0101] The third lens L3 has positive refractive power, an object-side surface S5 thereof is convex at the near optical axis, and an image-side surface S6 thereof is concave at the near optical axis;

[0102] The fourth lens L4 has negative refractive power, its object-side surface S7 is concave, and its image-side surface S8 is convex;

[0103] The fifth lens L5 has positive refractive power, its object-side surface S9 is convex at the near optical axis, and its image-side surface S10 is convex;

[0104] The sixth lens L6 has positive refractive power, an object-side surface S11 thereof is convex at the near optical axis, and an image-side surface S12 thereof is concave at the near optical axis;

[0105] The seventh lens L7 has negative refractive power, its object-side surface S13 is concave, and its image-side surface S14 is concave at the near optical axis;

[0106] The object side surface S15 and the image side surface S16 of the filter G1 are both planes;

[0107] The imaging surface S17 is a plane.

[0108] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all plastic aspherical lenses.

[0109] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0110] Table 1-1

[0111]

[0112] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0113] Table 1-2

[0114]

[0115] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, vertical axis chromatic aberration curve, and axial aberration curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 shown.

[0116] Figure 2 The field curvature curve of Example 1 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.4 mm, indicating that the optical lens can well correct the field curvature.

[0117] Figure 3 The F-Tan (Theta) distortion curve of Example 1 is shown, which represents the distortion of light of different wavelengths at different image heights on the imaging surface, with the horizontal axis representing the distortion value (unit: %) and the vertical axis representing the half field angle (unit: °). It can be seen from the figure that the distortion of the optical lens is controlled within ±2.5%, indicating that the optical lens can correct the distortion well.

[0118] Figure 4The vertical axis chromatic aberration curve of the optical lens 100 in this embodiment is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.555 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical axis chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens can correct chromatic aberration well.

[0119] Figure 5 The axial aberration curve of the optical lens 100 in this embodiment is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within ±0.03mm, indicating that the optical lens can better correct the axial aberration.

[0120] Example 2

[0121] See also Figure 6 , shown is a schematic diagram of the structure of the optical lens 200 provided in Example 2 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0122] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0123] Table 2-1

[0124]

[0125] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0126] Table 2-2

[0127]

[0128] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, vertical axis chromatic aberration curve, and axial aberration curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Fig. 9 , Fig.10 shown.

[0129] from Figure 7 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.4mm, indicating that the optical lens can correct the field curvature well.

[0130] from Figure 8It can be seen that the distortion of the optical lens is controlled within ±2.5%, indicating that the optical lens can correct the distortion well.

[0131] from Fig. 9 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens can correct chromatic aberration well.

[0132] from Fig.10 It can be seen that the offset of axial aberration is controlled within ±0.03mm, which means that the optical lens can correct axial aberration well.

[0133] Example 3

[0134] See also Fig.11 , shown is a schematic diagram of the structure of the optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0135] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0136] Table 3-1

[0137]

[0138] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0139] Table 3-2

[0140]

[0141] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, vertical axis chromatic aberration curve, and axial aberration curve of the optical lens 300 are respectively as follows: Fig.12 , Fig.13 , Fig.14 , Fig.15 shown.

[0142] from Fig.12 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.3mm, indicating that the optical lens can correct the field curvature well.

[0143] from Fig.13 It can be seen that the distortion of the optical lens is controlled within ±2.5%, indicating that the optical lens can correct the distortion well.

[0144] from Fig.14It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3μm, indicating that the optical lens can correct chromatic aberration well.

[0145] from Fig.15 It can be seen that the offset of axial aberration is controlled within ±0.03mm, which means that the optical lens can correct axial aberration well.

[0146] Example 4

[0147] See also Fig.16 , shown is a schematic diagram of the structure of an optical lens 400 provided in Example 4 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0148] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0149] Table 4-1

[0150]

[0151] The surface parameters of the aspherical lens of the optical lens in Example 4 are shown in Table 4-2.

[0152] Table 4-2

[0153]

[0154] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, vertical axis chromatic aberration curve, and axial aberration curve of the optical lens 400 are respectively as follows: Fig.17 , Fig.18 , Fig.19 , Fig. 20 shown.

[0155] from Fig.17 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.3mm, indicating that the optical lens can correct the field curvature well.

[0156] from Fig.18 It can be seen that the distortion of the optical lens is controlled within ±2.5%, indicating that the optical lens can correct the distortion well.

[0157] from Fig.19 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3μm, indicating that the optical lens can correct chromatic aberration well.

[0158] from Fig. 20It can be seen that the offset of axial aberration is controlled within ±0.03mm, which means that the optical lens can correct axial aberration well.

[0159] Example 5

[0160] See also Fig.21 , shown is a schematic diagram of the structure of an optical lens 500 provided in Example 5 of the present invention. Compared with Example 1, the main differences of this embodiment are: the image side surface S12 of the sixth lens L6 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0161] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0162] Table 5-1

[0163]

[0164] The surface parameters of the aspheric lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0165] Table 5-2

[0166]

[0167] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, vertical axis chromatic aberration curve, and axial aberration curve of the optical lens 500 are respectively as follows: Fig. 22 , Fig.23 , Fig.24 , Fig.25 shown.

[0168] from Fig. 22 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.4mm, indicating that the optical lens can correct the field curvature well.

[0169] from Fig.23 It can be seen that the distortion of the optical lens is controlled within ±2.5%, indicating that the optical lens can correct the distortion well.

[0170] from Fig.24 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens can correct chromatic aberration well.

[0171] from Fig.25 It can be seen that the offset of axial aberration is controlled within ±0.04mm, which means that the optical lens can correct axial aberration well.

[0172] Example 6

[0173] See also Fig.26 , shown is a schematic diagram of the structure of an optical lens 600 provided in Example 6 of the present invention. Compared with Example 1, the main differences of this embodiment are: the image side surface S12 of the sixth lens L6 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0174] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6-1.

[0175] Table 6-1

[0176]

[0177] The surface parameters of the aspheric lens of the optical lens 600 in Example 6 are shown in Table 6-2.

[0178] Table 6-2

[0179]

[0180] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, vertical axis chromatic aberration curve, and axial aberration curve of the optical lens 600 are respectively as follows: Fig. 27 , Fig.28 , Fig.29 , Fig.30 shown.

[0181] from Fig. 27 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.4mm, indicating that the optical lens can correct the field curvature well.

[0182] from Fig.28 It can be seen that the distortion of the optical lens is controlled within ±2.5%, indicating that the optical lens can correct the distortion well.

[0183] from Fig.29 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3μm, indicating that the optical lens can correct chromatic aberration well.

[0184] from Fig.30 It can be seen that the offset of axial aberration is controlled within ±0.03mm, which means that the optical lens can correct axial aberration well.

[0185] Please refer to Table 7, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f of the optical lens, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view angle, the maximum field of view angle FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0186] Table 7

[0187]

[0188] In summary, the optical lens provided by the present invention can improve the imaging quality of the optical lens, reduce aberrations, and improve the imaging quality of the optical lens through a specific surface shape setting and a reasonable optical focal length distribution, so that the lens has one or more advantages such as miniaturization, large image surface, large aperture, and high pixel.

[0189] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0190] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An optical lens, comprising seven lenses, characterized in that: It sequentially includes from the object side to the imaging surface along the optical axis: A first lens with positive optical power, whose object side is convex and whose image side is concave; A second lens with negative optical power, whose object side is convex and whose image side is concave; A third lens with positive optical power, whose object side is convex near the optical axis and whose image side is concave near the optical axis; A fourth lens with negative optical power, whose object side is concave and whose image side is convex; A fifth lens with positive optical power, whose object side is convex near the optical axis and whose image side is convex; A sixth lens with positive optical power, whose object side is convex near the optical axis; A seventh lens with negative optical power, whose object side is concave and whose image side is concave near the optical axis; Wherein, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -3.5 < f4 / f5 < -1.2; the curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: -3.3 < (R9 - R10) / (R9 + R10) < -2.2; the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: f3 / f > 5; the curvature radius R5 of the object side of the third lens and the curvature radius R6 of the image side of the third lens satisfy: (R5 + R6) / (R5 - R6) < -6.

2. The optical lens according to claim 1, characterized in that: The overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.1 < TTL / f < 1.2; the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.6 < TTL / IH < 0.

7.

3. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.75 < f1 / f < 0.95; the focal length f2 of the second lens and the focal length f1 of the first lens satisfy: -2.35 < f2 / f1 < -1.

7.

4. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -2 < f2 / f < -1.4; the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: 3.3 < R3 / R4 < 6.

7.

5. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 5.35 < f3 / f < 54.73; the curvature radius R5 of the object side of the third lens and the curvature radius R6 of the image side of the third lens satisfy: -118.28 < (R5 + R6) / (R5 - R6) < -6.

39.

6. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -8.1 < f4 / f < -3; the curvature radius R7 of the object side of the fourth lens and the curvature radius R8 of the image side of the fourth lens satisfy: -0.4 < (R7 - R8) / (R7 + R8) < 0.

7. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the curvature radius R7 of the object side surface of the fourth lens satisfy: -1.2 < R7 / f < -0.8; the effective focal length f of the optical lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -1.8 < R8 / f < -1.

3.

8. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: 1.6 < R9 / f < 2; the effective focal length f of the optical lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: -5 < R10 / f < -3.

3.

9. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the curvature radius R11 of the object side surface of the sixth lens satisfy: 0.65 < R11 / f < 0.85; the effective focal length f of the optical lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: 8 < |R12 / f| < 48.

10. The optical lens according to claim 1, characterized in that: The sagittal height Sag9 of the object side clear aperture of the fifth lens and the object side clear aperture d9 of the fifth lens satisfy: -0.2 < Sag9 / d9 < 0; the sagittal height Sag10 of the image side clear aperture of the fifth lens and the image side clear aperture d10 of the fifth lens satisfy: -0.3 < Sag10 / d10 < -0.1.

Images