Optical lens

Abstract

The present invention provides an optical lens, which has eight lenses in total, and includes in order from the object side to the imaging surface along the optical axis: a first lens with negative optical power, whose object side surface is concave and whose image side surface is convex; a second lens with positive optical power; a third lens with positive optical power, whose image side surface is convex; a fourth lens with negative optical power, whose object side surface is concave; a fifth lens with positive optical power, whose object side surface and image side surface are both convex; a sixth lens with negative optical power, whose object side surface is concave and whose image side surface is convex; a seventh lens with positive optical power; and an eighth lens with negative optical power, whose object side surface is concave. The optical lens provided by the present invention has one or more advantages such as telephoto, high resolution, and high imaging quality through specific surface shape matching and reasonable optical power distribution.

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 an important role in intelligent driving. They use various lenses and sensors to collect environmental information to ensure the safety of drivers. The existing ADAS system lenses require a longer focal length for long-distance imaging, but the longer focal length will result in a longer overall length of the lens, which is not conducive to the miniaturization of the lens. At the same time, such lenses also need to have good imaging quality at night or in environments with relatively weak lighting conditions. Summary of the invention

[0004] In view of the above problems, an object of the present invention is to provide an optical lens having one or more advantages such as long focal length, high resolution, and high imaging quality.

[0005] The technical solution adopted by the present invention is:

[0006] An optical lens, comprising eight lenses, which include:

[0007] The first lens has a negative optical power, the object side surface of which is concave and the image side surface of which is convex;

[0008] a second lens having positive optical power;

[0009] A third lens element having positive refractive power and a convex image-side surface;

[0010] a fourth lens element having negative optical power and a concave object side surface;

[0011] A fifth lens having positive refractive power, whose object-side surface and image-side surface are both convex;

[0012] a sixth lens having negative optical power, whose object side surface is concave and whose image side surface is convex;

[0013] a seventh lens having positive refractive power;

[0014] an eighth lens having negative optical power, whose object side surface is concave;

[0015] 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: -0.8<(R1-R2) / (R1+R2)<0.

[0016] Further preferably, the maximum field of view FOV of the optical lens and the aperture value FNO of the optical lens satisfy: 15° < FOV / FNO < 22°.

[0017] Further preferably, the true image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 0.4 < IH / f < 0.6.

[0018] Further preferably, the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: -0.9 < f8 / f < -0.4.

[0019] Further preferably, the combined focal length f2345678 of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens and the effective focal length f of the optical lens satisfy: 0.5 < f2345678 / f < 1.4.

[0020] Further preferably, the combined focal length f56 of the fifth lens and the sixth lens and the effective focal length f of the optical lens satisfy: 0.7 < f56 / f < 1.6.

[0021] Further preferably, the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: -1.3 < R1 / f < -0.6; the radius of curvature R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: -3.1 < R2 / f < -0.8.

[0022] Further preferably, the radius of curvature R12 of the image side surface of the sixth lens and the effective focal length f of the optical lens satisfy: -2.6 < R12 / f < -0.8; the radius of curvature R15 of the object side surface of the eighth lens and the effective focal length f of the optical lens satisfy: -1.3 < R15 / f < -0.5.

[0023] Further preferably, the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R12 of the image side surface satisfy: -3.4 < (R11 + R12) / (R11 - R12) < -1.6.

[0024] Further preferably, the sagittal height Sag1 of the object side surface clear aperture of the first lens and the object side surface clear aperture d1 of the first lens satisfy: -0.3 < Sag1 / d1 < -0.1; the sagittal height Sag2 of the image side surface clear aperture of the first lens and the image side surface clear aperture d2 of the first lens satisfy: -0.3 < Sag2 / d2 < 0.

[0025] The optical lens provided by the present invention adopts eight lenses with specific optical powers. Through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages such as long focus, high resolution, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

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

[0028] Figure 2 It is a field curvature curve diagram of the optical lens in Example 1 of the present invention.

[0029] Figure 3 Graph showing the F-Tan (Theta) distortion of the optical lens in Example 1 of the present invention.

[0030] Figure 4 Graph showing the axial aberration of the optical lens in Example 1 of the present invention.

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

[0032] Figure 6 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0033] Figure 7 4 is a field curvature curve diagram of the optical lens in Example 2 of the present invention.

[0034] Figure 8 Graph showing the F-Tan (Theta) distortion of the optical lens in Example 2 of the present invention.

[0035] Fig. 9 Graph showing the axial aberration of the optical lens in Embodiment 2 of the present invention.

[0036] Fig.10 This is an MTF curve diagram of the optical lens in Example 2 of the present invention.

[0037] Fig.11 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0038] Fig.12 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0039] Fig.13Graph showing the F-Tan (Theta) distortion of the optical lens in Example 3 of the present invention.

[0040] Fig.14 Graph showing the axial aberration of the optical lens in Embodiment 3 of the present invention.

[0041] Fig.15 This is the MTF curve diagram of the optical lens in Example 3 of the present invention.

[0042] Fig.16 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0043] Fig.17 It is a field curvature curve diagram of the optical lens in Example 4 of the present invention.

[0044] Fig.18 4 is a F-Tan (Theta) distortion curve of the optical lens in Example 4 of the present invention.

[0045] Fig.19 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0046] Fig. 20 This is the MTF curve diagram of the optical lens in Example 4 of the present invention.

[0047] Fig.21 Schematic diagram of the structure of the optical lens in Example 5 of the present invention.

[0048] Fig. 22 4 is a field curvature curve diagram of the optical lens in Example 5 of the present invention.

[0049] Fig.23 4 is a graph showing the F-Tan (Theta) distortion curve of the optical lens in Example 5 of the present invention.

[0050] Fig.24 Graph showing the axial aberration of the optical lens in Embodiment 5 of the present invention.

[0051] Fig.25 This is the MTF curve diagram of the optical lens in Example 5 of the present invention.

[0052] Fig.26 Schematic diagram of the structure of the optical lens in Example 6 of the present invention.

[0053] Fig. 27 4 is a field curvature curve diagram of the optical lens in Example 6 of the present invention.

[0054] Fig.28 4 is a graph showing the F-Tan (Theta) distortion curve of the optical lens in Example 6 of the present invention.

[0055] Fig.29Graph showing the axial aberration of the optical lens in Embodiment 6 of the present invention.

[0056] Fig.30 This is the MTF curve diagram of the optical lens in Example 6 of the present invention.

[0057] Fig.31 Schematic diagram of the structure of the optical lens in Example 7 of the present invention.

[0058] Fig.32 4 is a field curvature curve diagram of the optical lens in Example 7 of the present invention.

[0059] Fig.33 Graph showing the F-Tan (Theta) distortion of the optical lens in Example 7 of the present invention.

[0060] Fig.34 Graph showing the axial aberration of the optical lens in Embodiment 7 of the present invention.

[0061] Fig.35 This is an MTF curve diagram of the optical lens in Example 7 of the present invention.

[0062] Fig.36 Schematic diagram of the structure of the optical lens in Example 8 of the present invention.

[0063] Fig.37 It is a field curvature curve diagram of the optical lens in Example 8 of the present invention.

[0064] Fig.38 4 is a graph showing the F-Tan (Theta) distortion curve of the optical lens in Example 8 of the present invention.

[0065] Fig.39 4 is an axial aberration curve diagram of the optical lens in Example 8 of the present invention.

[0066] Fig.40 This is the MTF curve diagram of the optical lens in Example 8 of the present invention.

[0067] Fig.41 Schematic diagram of the structure of the optical lens in Example 9 of the present invention.

[0068] Fig.42 4 is a field curvature curve diagram of the optical lens in Example 9 of the present invention.

[0069] Fig.43 Graph showing the F-Tan (Theta) distortion of the optical lens in Example 9 of the present invention.

[0070] Fig.44 Graph showing the axial aberration of the optical lens in Embodiment 9 of the present invention.

[0071] Fig.45This is an MTF curve diagram of the optical lens in Example 9 of the present invention.

[0072] Fig.46 Schematic diagram of the structure of the optical lens in Example 10 of the present invention.

[0073] Fig.47 It is a field curvature curve diagram of the optical lens in embodiment 10 of the present invention.

[0074] Fig.48 4 is a graph showing the F-Tan (Theta) distortion curve of the optical lens in Example 10 of the present invention.

[0075] Fig.49 Graph showing the axial aberration of the optical lens in Embodiment 10 of the present invention.

[0076] Fig.50 This is an MTF curve diagram of the optical lens in Example 10 of the present invention.

[0077] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0078] 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.

[0079] 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.

[0080] 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.

[0081] In this article, the near optical axis refers to the area 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 at the near optical axis; 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 at the near optical axis. 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] The optical lens provided by the embodiment of the present invention is composed of eight lenses, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in order from the object side to the imaging surface along the optical axis.

[0086] In some embodiments, the first lens may have negative optical power, its object side surface is concave, and its image side surface is convex; the second lens may have positive optical power, its object side surface may be concave or convex, and its image side surface may be concave or convex; the third lens may have positive optical power, its object side surface may be concave or convex, and its image side surface may be convex; the fourth lens may have negative optical power, its object side surface is concave, and its image side surface may be concave or convex; the fifth lens may have positive optical power, and both its object side surface and image side surface are convex; the sixth lens may have negative optical power, its object side surface is concave, and its image side surface is convex; the seventh lens may have positive optical power, its object side surface may be concave or convex, and its image side surface may be concave or convex; the eighth lens may have negative optical power, its object side surface is concave, and its image side surface may be concave or convex.

[0087] In some embodiments, the optical lens may further include a diaphragm, which may be located between the first lens and the second lens. It can be understood that the diaphragm can be used to limit the amount of incident light to change the brightness of the imaging. In addition, when the diaphragm is located between the first lens and the second lens, the diaphragm can reasonably distribute the functions of the first lens to the eighth lens. For example, the first lens can be used to receive light to a greater extent, and the second lens to the eighth lens can be used to correct aberrations, which is beneficial to balancing the structure of the entire optical system. In addition, when the diaphragm is located between the first lens and the second lens, it is convenient to correct the diaphragm aberration.

[0088] In some embodiments, the optical lens may further include a filter and a protective glass, which may be sequentially arranged along the optical axis between the eighth lens and the imaging surface. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging. The protective glass plays a role in protecting the optical lens, preventing the photosensitive chip from being damaged, and can improve the shock resistance and scratch resistance of the optical lens, while having almost no impact on the imaging quality of the optical lens.

[0089] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: -0.8 < (R1 - R2) / (R1 + R2) < 0. Satisfying the above range, by reasonably defining the shapes of the object side surface and the image side surface of the first lens, the distortion generated by the first lens can be reduced, the difficulty of distortion correction of subsequent lenses can be reduced, and it is helpful to improve the imaging quality. Preferably, -0.61 < (R1 - R2) / (R1 + R2) < -0.07.

[0090] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value FNO of the optical lens satisfy: 15° < FOV / FNO < 22°. Satisfying the above range, by reasonably defining the maximum field of view and the aperture value of the optical lens, it is helpful for the optical lens to better collect objects in a small-angle and long-distance range and improve the imaging quality of the optical lens. Preferably, 15.55° < FOV / FNO < 20.01°.

[0091] In some embodiments, the true image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 0.4 < IH / f < 0.6. Satisfying the above range, by reasonably defining the maximum true image height and the effective focal length of the optical lens, it is helpful for the optical lens to have large image plane and long focal length characteristics. Preferably, 0.44 < IH / f < 0.53.

[0092] In some embodiments, the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: -0.9 < f8 / f < -0.4. Meeting the above range, by reasonably limiting the proportion of the focal length of the eighth lens, it helps to control the light trend and increase the image plane of the optical lens. Preferably, -0.79 < f8 / f < -0.47.

[0093] In some embodiments, the combined focal length f2345678 of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens and the effective focal length f of the optical lens satisfy: 0.5 < f2345678 / f < 1.4. Meeting the above range, by reasonably distributing the proportion of the combined focal length of the rear lens group of the optical lens, the optical power of the optical lens can be reasonably distributed, and the imaging quality can be further improved. Preferably, 0.61 < f2345678 / f < 1.21.

[0094] In some embodiments, the combined focal length f56 of the fifth lens and the sixth lens and the effective focal length f of the optical lens satisfy: 0.7 < f56 / f < 1.6. Meeting the above range, by reasonably distributing the proportion of the combined focal length of the fifth lens and the sixth lens, it helps to reasonably control the degree of light deflection, correct the chromatic aberration of the optical lens and reduce the eccentricity sensitivity of the optical lens. Preferably, 0.84 < f56 / f < 1.42.

[0095] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: -1.3 < R1 / f < -0.6; the radius of curvature R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: -3.1 < R2 / f < -0.8. Meeting the above range, by reasonably controlling the shapes of the object side surface and the image side surface of the first lens, the concave surface can face the object side and the convex surface can face the image side, converging the light rays of the marginal field angle and improving the relative illumination of the optical lens. Preferably, -1.15 < R1 / f < -0.7; -2.84 < R2 / f < -0.9.

[0096] In some embodiments, the radius of curvature R12 of the image side surface of the sixth lens and the effective focal length f of the optical lens satisfy: -2.6 < R12 / f < -0.8; the radius of curvature R15 of the object side surface of the eighth lens and the effective focal length f of the optical lens satisfy: -1.3 < R15 / f < -0.5. Meeting the above range, by reasonably controlling the shapes of the image side surface of the sixth lens and the object side surface of the eighth lens, it helps to balance the aberration of the optical lens and improve the imaging quality. Preferably, -2.36 < R12 / f < -1.04; -1.11 < R15 / f < -0.54.

[0097] 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 satisfy: -3.4 < (R11 + R12) / (R11 - R12) < -1.6. By satisfying the above range and reasonably controlling the shapes of the object side surface and the image side surface of the sixth lens, the light trend in the marginal field of view can be controlled, and the image height can be increased at the same time. Preferably, -3.12 < (R11 + R12) / (R11 - R12) < -1.74.

[0098] In some embodiments, the sagittal height Sag1 of the clear aperture of the object side surface of the first lens and the clear aperture diameter d1 of the object side surface of the first lens satisfy: -0.3 < Sag1 / d1 < -0.1; the sagittal height Sag2 of the clear aperture of the image side surface of the first lens and the clear aperture diameter d2 of the image side surface of the first lens satisfy: -0.3 < Sag2 / d2 < 0. By satisfying the above range, it helps to control the light trend in the marginal field of view and highlight the detailed information of the central field of view of the optical lens. Preferably, -0.27 < Sag1 / d1 < -0.15; -0.24 < Sag2 / d2 < -0.04.

[0099] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2 < TTL / f < 4.4, and 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: 4 < TTL / IH < 8.9. By satisfying the above range and reasonably defining the overall optical length TTL, the effective focal length f, and the true image height IH corresponding to the maximum field of view angle of the optical lens, there is enough space to arrange each lens in the optical lens, and it has the characteristic of a large image plane. Preferably, 2.07 < TTL / f < 4.12, 4.37 < TTL / IH < 8.12.

[0100] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens, the effective focal length f, and the maximum field of view angle FOV of the optical lens satisfy: 0.9 < (IH / 2) / (f × tan(FOV / 2)) < 1. By satisfying the above range, it helps to better control the optical distortion of the optical lens and improve the resolution of the optical lens. Preferably, 0.94 < (IH / 2) / (f × tan(FOV / 2)) < 1.

[0101] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 0.65 < IH / EPD < 0.95. By reasonably controlling the true image height and the entrance pupil diameter corresponding to the maximum field of view angle of the optical lens within the above range, the width of the light beam incident on the optical lens can be increased, so that the brightness at the image plane of the optical lens is improved to avoid vignetting, and the optical lens has the characteristic of a large image plane, thereby improving the imaging quality. Preferably, 0.72 < IH / EPD < 0.89.

[0102] In some embodiments, the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.1 < BFL / f < 0.5. By reasonably limiting the back focal length of the optical lens within the above range, the design and assembly difficulty of the optical lens can be reduced, and the yield can be improved. Preferably, 0.1 < BFL / f < 0.45.

[0103] In some embodiments, the optical lens satisfies at least one of the following conditional expressions. The focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: f1 / f < -1.5; the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: f2 / f > 1.1; the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.7 < f3 / f < 1.4; the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: -1.3 < f4 / f < -0.4; the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.5 < f5 / f < 1.2; the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -3.2 < f6 / f < -1.1; the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 0.9 < f7 / f < 3.2. By reasonably distributing the proportion of the optical power of each lens within the above range, it helps to optimize the imaging effect and improve the imaging quality of the optical lens. Further, 1.1 < f2 / f < 64. Preferably, f1 / f < -1.66, 1.21 < f2 / f < 58.89, 0.78 < f3 / f < 1.26, -1.11 < f4 / f < -0.49, 0.54 < f5 / f < 0.96, -0.86 < f6 / f < -1.27, 1 < f7 / f < 2.97.

[0104] In some embodiments, the radius of curvature R6 of the image side surface of the third lens and the effective focal length f of the optical lens satisfy: -1.3 < R6 / f < -0.5; the radius of curvature R7 of the object side surface of the fourth lens and the effective focal length f of the optical lens satisfy: -1.3 < R7 / f < -0.5. Satisfying the above ranges, by reasonably defining the shapes of the image side surface of the third lens and the object side surface of the fourth lens, it helps to control the stable trend of light, correct chromatic aberration and spherical aberration, and improve the imaging quality. Preferably, -1.11 < R6 / f < -0.61, -1.11 < R7 / f < -0.61.

[0105] In some embodiments, the radius of curvature R11 of the object side surface of the sixth lens and the effective focal length f of the optical lens satisfy: -1.1 < R11 / f < -0.4; 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 satisfy: 0.2 < R11 / R12 < 0.6. Satisfying the above ranges, by reasonably defining the shapes of the object side surface and the image side surface of the sixth lens, it helps to reduce field curvature and the difficulty of correcting spherical aberration of subsequent lenses. Preferably, -0.96 < R11 / f < -0.5, 0.26 < R11 / R12 < 0.52.

[0106] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface satisfy: 0.2 < R1 / R2 < 1. Satisfying the above ranges can define the object side surface and the image side surface of the first lens to have appropriate shapes, which helps to control the degree of light deflection entering the optical lens from the front end and reduce the difficulty of correcting distortion of subsequent lenses. Preferably, 0.24 < R1 / R2 < 0.86.

[0107] In some embodiments, the radius of curvature R6 of the image side surface of the third lens and the focal length f3 of the third lens satisfy: -1.4 < R6 / f3 < -0.5, the radius of curvature R7 of the object side surface of the fourth lens and the focal length f4 of the fourth lens satisfy: 0.5 < R7 / f4 < 2.5. Satisfying the above ranges can reasonably control the deflection of light between the third lens and the fourth lens, reduce stray light, and improve the imaging quality. Preferably, -1.22 < R6 / f3 < -0.59, 0.74 < R7 / f4 < 2.24.

[0108] In some embodiments, the radius of curvature R9 of the object side surface of the fifth lens and the focal length f5 of the fifth lens satisfy: 1 < R9 / f5 < 1.5, the radius of curvature R10 of the image side surface of the fifth lens and the focal length f5 of the fifth lens satisfy: -1.3 < R10 / f5 < -0.6. Satisfying the above ranges can reasonably correct the distortion of light passing through the fifth lens. Preferably, 1.1 < R9 / f5 < 1.36, -1.14 < R10 / f5 < -0.83.

[0109] In some embodiments, the radius of curvature R11 of the object side surface of the sixth lens and the focal length f6 of the sixth lens satisfy: 0.2 < R11 / f6 < 0.6, and the radius of curvature R12 of the image side surface of the sixth lens and the focal length f6 of the sixth lens satisfy: 0.5 < R12 / f6 < 2. By satisfying the above ranges and reasonably defining the shapes of the object side surface and the image side surface of the sixth lens, the deflection angle of the marginal rays can be reduced, and the difficulty of correcting subsequent lens aberrations can be reduced. Preferably, 0.31 < R11 / f6 < 0.51, 0.62 < R12 / f6 < 1.85.

[0110] In some embodiments, the radius of curvature R15 of the object side surface of the eighth lens and the focal length f8 of the eighth lens satisfy: 0.5 < R15 / f8 < 1.8. By satisfying the above range, it is helpful to suppress the angle of incidence of the marginal field of view on the imaging surface, effectively transmit more light beams to the imaging surface, and improve the imaging quality. Preferably, 0.71 < R15 / f8 < 1.5.

[0111] In some embodiments, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface satisfy: (R9 - R10) / (R9 + R10) > 3.8. By satisfying the above range, the distortion of the light passing through the fifth lens can be reasonably corrected. Preferably, 4.28 < (R9 - R10) / (R9 + R10) < 1955.65.

[0112] In some embodiments, the radius of curvature R14 of the image side surface of the seventh lens and the radius of curvature R15 of the object side surface of the eighth lens satisfy: 0.4 < (R14 - R15) / (R14 + R15) < 1.8. By satisfying the above range, the aberrations of the optical lens can be optimized and the imaging quality can be improved. Preferably, 0.42 < (R14 - R15) / (R14 + R15) < 1.67.

[0113] In some embodiments, the radius of curvature R15 of the object side surface of the eighth lens and the radius of curvature R16 of the image side surface of the eighth lens satisfy: (R15 - R16) / (R15 + R16) < -0.8. By satisfying the above range, the trend of the marginal field of view light beam can be controlled to increase the image height, and at the same time, the off-axis aberration of the optical lens can be reduced. Preferably, -52 < (R15 - R16) / (R15 + R16) < -0.96.

[0114] In some embodiments, the sagittal height Sag12 of the image-side clear aperture of the sixth lens and the clear aperture diameter d12 of the image-side clear aperture of the sixth lens satisfy: -0.3 < Sag12 / d12 < 0, and the sagittal height Sag15 of the object-side clear aperture of the eighth lens and the clear aperture diameter d15 of the object-side clear aperture of the eighth lens satisfy: -0.3 < Sag15 / d15 < -0.1. Meeting the above ranges can effectively control the light path of the peripheral field of view and highlight the detailed information of the central field of view of the optical lens. Preferably, -0.22 < Sag12 / d12 < -0.06, -0.25 < Sag15 / d15 < -0.14.

[0115] In some embodiments, the overall optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the sixth lens along the optical axis satisfy: 0.5 < ∑CT / TTL < 0.9. Meeting the above range helps to achieve high pixel characteristics and improve the imaging quality of the optical lens. Preferably, 0.57 < ∑CT / TTL < 0.8.

[0116] In some embodiments, the clear aperture diameter d1 of the object side of the first lens, the true image height IH corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: 4.4 < d1 / (IH / 2) / tan(FOV / 2) < 7.6. Meeting the above range can reasonably arrange the overall geometric shape of the optical lens and improve its structural stability by reasonably defining the front aperture diameter, true image height, and maximum field of view angle of the optical lens. Preferably, 4.8 < d1 / (IH / 2) / tan(FOV / 2) < 6.84.

[0117] In some embodiments, the optical lens satisfies the following conditional expressions: 7 mm < f < 16 mm; 24° < FOV < 32°; 4.3 mm < EPD < 10.3 mm; 28 mm < TTL < 36 mm; 1.4 < FNO < 1.9; 3.5 mm < IH < 7.7 mm; 8.7° < CRA < 22.5°; 1.4 < BFL < 3.9 mm. In the above conditional expressions, 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, IH represents the true image height corresponding to the maximum field of view angle of the optical lens, CRA represents the chief ray incident angle at the maximum image height of the optical lens, and BFL represents the back focal length of the optical lens. Meeting the above ranges, the optical lens has at least one or more advantages such as a large target surface, a large aperture, and a large field of view angle. Preferably, 7.52 mm < f < 15.07 mm; 25.99° < FOV < 30.01°; 4.69 mm < EPD < 9.43 mm; 30.75 mm < TTL < 34.01 mm; 1.49 < FNO < 1.81; 3.81 mm < IH < 7.09 mm; 9.6° < CRA < 20.44°; 1.54 < BFL < 3.49 mm.

[0118] In some embodiments, the lens material in the optical lens provided by the present invention may 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. More specifically, the first lens to the eighth lens in the optical lens provided by the present invention are all glass lenses.

[0119] In some embodiments, the lens in the optical lens provided by the present invention may adopt a spherical lens or an aspherical lens. 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; compared with the aspherical structure, the spherical structure has a lower cost and better imaging quality. More specifically, the first lens to the eighth lens of the present invention all adopt spherical lenses.

[0120] The present invention will be further described in multiple embodiments below. In each embodiment, the thickness, curvature radius, and material selection of each lens in the optical lens are somewhat different. For specific differences, refer to the parameter tables of each embodiment. The following embodiments are only the preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following embodiments. Any other changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be regarded as equivalent replacement methods and are included in the protection scope of the present invention.

[0121] Example 1

[0122] See also Figure 1 , which is a schematic diagram of the structure of the optical lens 100 provided in Embodiment 1 of the present invention, wherein the optical lens 100 includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, an aperture ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a filter G1 and a protective glass G2.

[0123] The first lens L1 has negative refractive power, its object side surface S1 is concave, and its image side surface S2 is convex;

[0124] The second lens L2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both convex surfaces;

[0125] The third lens L3 has positive refractive power, and its object side surface S5 and image side surface are both convex;

[0126] The fourth lens L4 has negative refractive power, and its object-side surface and image-side surface S7 are both concave;

[0127] The third lens L3 and the fourth lens L4 form a cemented lens group with negative power, that is, the cemented surface between the image side surface of the third lens L3 and the object side surface of the fourth lens L4 is S6;

[0128] The fifth lens L5 has positive refractive power, and its object-side surface S8 and image-side surface are both convex;

[0129] The sixth lens L6 has negative refractive power, its object-side surface is concave, and its image-side surface S10 is convex;

[0130] The fifth lens L5 and the sixth lens L6 form a cemented lens group with positive refractive power, 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 S9;

[0131] The seventh lens L7 has positive refractive power, and its object-side surface S11 and image-side surface S12 are both convex surfaces;

[0132] The eighth lens L8 has negative refractive power, and its object-side surface S13 and image-side surface S14 are both concave surfaces;

[0133] The object side surface S15 and the image side surface S16 of the filter G1 are both planes;

[0134] The object side surface S17 and the image side surface S18 of the protective glass G2 are both planes;

[0135] The imaging surface S19 is a plane.

[0136] The first lens L1 to the sixth lens L8 are glass spherical lenses.

[0137] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1.

[0138] Table 1

[0139]

[0140] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve and MTF curve of the optical lens 100 are respectively as follows: Figures 2 to 5 shown.

[0141] 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, the horizontal axis indicates the offset (unit: mm), and the vertical axis indicates 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 -0.02mm~0.03mm, indicating that the optical lens can correct the field curvature well.

[0142] Figure 3 The F-Tan (Theta) distortion curve of Example 1 is shown, which represents the F-Tan (Theta) distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tan (Theta) distortion value (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tan (Theta) distortion of the optical lens is controlled within -1.5%~0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0143] Figure 4 The axial aberration curve of Example 1 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 -0.01mm~0.03mm, indicating that the optical lens can correct the axial aberration well.

[0144] Figure 5 The MTF (Modulation Transfer Function) curve of Example 1 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.2 in the whole field of view, and in the range of 0 to 300 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability under normal temperature.

[0145] Example 2

[0146] 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.

[0147] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2.

[0148] Table 2

[0149]

[0150] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, and MTF curve of the optical lens 200 are shown as follows: Figures 7 to 10 As shown. Figure 7 It can be seen from the figure that the field curvature of the meridian image plane and the sagittal image plane is controlled within -0.01mm~0.03mm, indicating that the optical lens 200 can correct the field curvature well. Figure 8 It can be seen that the F-Tan (Theta) distortion of the optical lens 200 is controlled within -3.5% to 0, and the image compression in the edge angle area is relatively gentle, which effectively improves the clarity of the expanded image. Fig. 9 It can be seen from the figure that the offset of the axial aberration in this embodiment is controlled within -0.01mm~0.03mm, indicating that the optical lens can correct the axial aberration well. Fig.10 It can be seen that the MTF value of this embodiment is above 0.25 in the whole field of view. In the range of 0 to 300 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, with good imaging quality and good detail resolution.

[0151] Example 3

[0152] 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.

[0153] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3.

[0154] Table 3

[0155]

[0156] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, and MTF curve of the optical lens 300 are shown as follows: Figures 12 to 15As shown. Fig.12 It can be seen from the figure that the field curvature of the meridian image plane and the sagittal image plane is controlled within -0.01mm~0.04mm, indicating that the optical lens 300 can correct the field curvature well. Fig.13 It can be seen that the F-Tan (Theta) distortion of the optical lens 300 is controlled within -1.5% to 0, and the image compression in the edge angle area is relatively gentle, which effectively improves the clarity of the expanded image. Fig.14 It can be seen from the figure that the offset of the axial aberration in this embodiment is controlled within -0.01mm~0.04mm, indicating that the optical lens can correct the axial aberration well. Fig.15 It can be seen that the MTF value of this embodiment is above 0.3 in the whole field of view. In the range of 0 to 300 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution capability.

[0157] Example 4

[0158] 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.

[0159] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4.

[0160] Table 4

[0161]

[0162] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, and MTF curve of the optical lens 400 are shown as follows: Figures 17 to 20 As shown. Fig.17 It can be seen from the figure that the field curvature of the meridian image plane and the sagittal image plane is controlled within -0.02mm~0.04mm, indicating that the optical lens 400 can correct the field curvature well. Fig.18 It can be seen that the F-Tan (Theta) distortion of the optical lens 400 is controlled within -3% to 0, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the expanded image. Fig.19 It can be seen from the figure that the offset of the axial aberration in this embodiment is controlled within -0.01mm~0.04mm, indicating that the optical lens can correct the axial aberration well. Fig. 20It can be seen that the MTF value of this embodiment is above 0.2 in the whole field of view. In the range of 0 to 300 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution capability.

[0163] Example 5

[0164] 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 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.

[0165] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5.

[0166] Table 5

[0167]

[0168] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, and MTF curve of the optical lens 500 are shown as follows: Figure 22 to Figure 25 As shown. Fig. 22 It can be seen from the figure that the field curvature of the meridian image plane and the sagittal image plane is controlled within -0.02mm~0.03mm, indicating that the optical lens 500 can correct the field curvature well. Fig.23 It can be seen that the F-Tan (Theta) distortion of the optical lens 500 is controlled within -2%~0, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the expanded image. Fig.24 It can be seen from the figure that the offset of the axial aberration in this embodiment is controlled within -0.01mm~0.03mm, indicating that the optical lens can correct the axial aberration well. Fig.25 It can be seen that the MTF value of this embodiment is above 0.25 in the whole field of view. In the range of 0 to 300 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, with good imaging quality and good detail resolution.

[0169] Example 6

[0170] 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 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.

[0171] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6.

[0172] Table 6

[0173]

[0174] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, and MTF curve of the optical lens 600 are shown as follows: Figures 27 to 30 As shown. Fig. 27 It can be seen from the figure that the field curvature of the meridian image plane and the sagittal image plane is controlled within -0.02mm~0.04mm, indicating that the optical lens 600 can correct the field curvature well. Fig.28 It can be seen that the F-Tan (Theta) distortion of the optical lens 600 is controlled within -3% to 0, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the expanded image. Fig.29 It can be seen from the figure that the offset of the axial aberration in this embodiment is controlled within -0.01mm~0.04mm, indicating that the optical lens can correct the axial aberration well. Fig.30 It can be seen that the MTF value of this embodiment is above 0.15 in the whole field of view. In the range of 0 to 300 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, with good imaging quality and good detail resolution.

[0175] Example 7

[0176] See also Fig.31 , shown is a schematic diagram of the structure of an optical lens 700 provided in Example 7 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.

[0177] The relevant parameters of each lens in the optical lens 700 in Example 7 are shown in Table 7.

[0178] Table 7

[0179]

[0180] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, and MTF curve of the optical lens 700 are shown as follows: Figure 32 to Figure 35 As shown. Fig.32 It can be seen from the figure that the field curvature of the meridian image plane and the sagittal image plane is controlled within -0.02mm~0.04mm, indicating that the optical lens 700 can correct the field curvature well. Fig.33It can be seen that the F-Tan (Theta) distortion of the optical lens 700 is controlled within -3.5% to 0, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the expanded image. Fig.34 It can be seen from the figure that the offset of the axial aberration in this embodiment is controlled within -0.02mm~0.05mm, indicating that the optical lens can correct the axial aberration well. Fig.35 It can be seen that the MTF value of this embodiment is above 0.15 in the whole field of view. In the range of 0 to 300 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, with good imaging quality and good detail resolution.

[0181] Example 8

[0182] See also Fig.36 , shown is a schematic diagram of the structure of the optical lens 800 provided in Example 8 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.

[0183] The relevant parameters of each lens in the optical lens 800 in Example 8 are shown in Table 8.

[0184] Table 8

[0185]

[0186] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, and MTF curve of the optical lens 800 are shown as follows: Figures 37 to 40 As shown. Fig.37 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within -0.01mm~0.04mm, indicating that the optical lens 800 can correct the field curvature well. Fig.38 It can be seen that the F-Tan (Theta) distortion of the optical lens 800 is controlled within -4%~0, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the expanded image. Fig.39 It can be seen from the figure that the offset of the axial aberration in this embodiment is controlled within -0.01mm~0.04mm, indicating that the optical lens can correct the axial aberration well. Fig.40 It can be seen that the MTF value of this embodiment is above 0.2 in the whole field of view. In the range of 0 to 300 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution capability.

[0187] Example 9

[0188] See also Fig.41 , shown is a schematic diagram of the structure of an optical lens 900 provided in Example 9 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.

[0189] The relevant parameters of each lens in the optical lens 900 in Example 9 are shown in Table 9.

[0190] Table 9

[0191]

[0192] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, and MTF curve of the optical lens 900 are shown as follows: Figure 42 to Figure 45 As shown. Fig.42 It can be seen from the figure that the field curvature of the meridian image plane and the sagittal image plane is controlled within -0.01mm~0.02mm, indicating that the optical lens 900 can correct the field curvature well. Fig.43 It can be seen that the F-Tan (Theta) distortion of the optical lens 900 is controlled within -5.5% to 0, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the expanded image. Fig.44 It can be seen from the figure that the offset of the axial aberration in this embodiment is controlled within -0.01mm~0.02mm, indicating that the optical lens can correct the axial aberration well. Fig.45 It can be seen that the MTF value of this embodiment is above 0.3 in the whole field of view. In the range of 0 to 300 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution capability.

[0193] Example 10

[0194] See also Fig.46 , shown is a schematic diagram of the structure of the optical lens 1000 provided in Example 10 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.

[0195] The relevant parameters of each lens in the optical lens 1000 in Example 10 are shown in Table 10.

[0196] Table 10

[0197]

[0198] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, and MTF curve of the optical lens 1000 are shown as follows: Figures 47 to 50 As shown. Fig.47 It can be seen from the figure that the field curvature of the meridian image plane and the sagittal image plane is controlled within -0.02mm~0.06mm, indicating that the optical lens 1000 can correct the field curvature well. Fig.48 It can be seen that the F-Tan (Theta) distortion of the optical lens 1000 is controlled within -3.5% to 0, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the expanded image. Fig.49 It can be seen from the figure that the offset of the axial aberration in this embodiment is controlled within -0.02mm~0.06mm, indicating that the optical lens can correct the axial aberration well. Fig.50 It can be seen that the MTF value of this embodiment is above 0.25 in the whole field of view. In the range of 0 to 300 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, with good imaging quality and good detail resolution.

[0199] Please refer to Table 11-1, Table 11-2, Table 11-3 and Table 11-4 for 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.

[0200] Table 11-1

[0201]

[0202] Table 11-2

[0203]

[0204] Table 11-3

[0205]

[0206] Table 11-4

[0207]

[0208] In summary of the above embodiments, the optical lens provided by the present invention adopts eight lenses with specific optical powers. Through specific surface shape matching and reasonable optical power distribution, it is possible to improve the imaging quality of the optical lens, reduce aberrations, and improve the imaging quality of the optical lens, so that the lens has one or more advantages such as telephoto, high resolution, and high imaging quality.

[0209] 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.

[0210] 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 eight lenses, characterized in that: It sequentially includes from the object side to the imaging surface along the optical axis: A first lens with a negative optical power, whose object side is concave and whose image side is convex; A second lens with a positive optical power; A third lens with a positive optical power, whose image side is convex; A fourth lens with a negative optical power, whose object side is concave; A fifth lens with a positive optical power, whose object side and image side are both convex; A sixth lens with a negative optical power, whose object side is concave and whose image side is convex; A seventh lens with a positive optical power; An eighth lens with a negative optical power, whose object side is concave; Wherein, the radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side of the first lens satisfy: -0.8 < (R1 - R2) / (R1 + R2) < 0; the combined focal length f2345678 of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens and the effective focal length f of the optical lens satisfy: 0.5 < f2345678 / f < 1.4; the radius of curvature R15 of the object side of the eighth lens and the radius of curvature R16 of the image side of the eighth lens satisfy: (R15 - R16) / (R15 + R16) < -0.

8.

2. The optical lens according to claim 1, characterized in that: The maximum field of view angle FOV of the optical lens and the aperture value FNO of the optical lens satisfy: 15° < FOV / FNO < 22°.

3. The optical lens according to claim 1, characterized in that: The true image height IH corresponding to the maximum field of view angle of the optical lens and the effective focal length f of the optical lens satisfy: 0.4 < IH / f < 0.

6.

4. The optical lens according to claim 1, characterized in that: The focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: -0.9 < f8 / f < -0.

4.

5. The optical lens according to claim 1, characterized in that: The radius of curvature R15 of the object side of the eighth lens and the radius of curvature R16 of the image side of the eighth lens satisfy: -52 < (R15 - R16) / (R15 + R16) < -0.96; the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.7 < f3 / f < 1.4; the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: -1.3 < f4 / f < -0.

4.

6. The optical lens according to claim 1, characterized in that: The combined focal length f56 of the fifth lens and the sixth lens and the effective focal length f of the optical lens satisfy: 0.7 < f56 / f < 1.

6.

7. The optical lens according to claim 1, characterized in that: The radius of curvature R1 of the object side of the first lens and the effective focal length f of the optical lens satisfy: -1.3 < R1 / f < -0.6; the radius of curvature R2 of the image side of the first lens and the effective focal length f of the optical lens satisfy: -3.1 < R2 / f < -0.

8.

8. The optical lens according to claim 1, characterized in that: The radius of curvature R12 of the image side of the sixth lens and the effective focal length f of the optical lens satisfy: -2.6 < R12 / f < -0.8; the radius of curvature R15 of the object side of the eighth lens and the effective focal length f of the optical lens satisfy: -1.3 < R15 / f < -0.

5.

9. The optical lens according to claim 1, characterized in that: The radius of curvature R11 of the object side of the sixth lens and the radius of curvature R12 of the image side satisfy: -3.4 < (R11 + R12) / (R11 - R12) < -1.

6.

10. The optical lens according to claim 1, characterized in that: The sagittal height Sag1 of the light-passing semi-aperture on the object side of the first lens and the light-passing semi-aperture d1 on the object side of the first lens satisfy: -0.3 < Sag1 / d1 < -0.1; the sagittal height Sag2 of the light-passing semi-aperture on the image side of the first lens and the light-passing semi-aperture d2 on the image side of the first lens satisfy: -0.3 < Sag2 / d2 < 0.

Images