Optical lens

Abstract

The invention provides an optical lens, which consists of eight lenses, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface, the second lens has negative focal power; the object side surface of the third lens is a convex surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface; the fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power; the seventh lens has positive focal power, and the image side surface of the seventh lens is a convex surface; and the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a convex surface. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, the imaging quality of the optical lens can be improved, and the lens has one or more advantages of large field angle, large aperture, high imaging quality and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of imaging lenses, in particular to an optical lens. BACKGROUND

[0002] The law enforcement instrument is mainly used for digital recording of the scene in the law enforcement process, such as video shooting, photographing, audio recording, etc., so as to provide effective scene image data afterwards. In the process of on-site law enforcement, law enforcement personnel need to record a larger range and clear image, however, the lens of the law enforcement instrument on the market either records unclear images or has too small a field of view and cannot record too many pictures.

[0003] Therefore, how to make the lens of the law enforcement instrument meet high imaging quality is a problem to be solved at present. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide an optical lens, which has the advantages of excellent imaging quality.

[0005] The technical scheme adopted by the present application is:

[0006] An optical lens composed of eight lenses, including, along the optical axis, from the object side to the imaging surface:

[0007] A first lens with negative focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface;

[0008] A second lens with negative focal power;

[0009] A third lens with positive focal power, the object side surface of which is a convex surface;

[0010] A fourth lens with negative focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface;

[0011] A fifth lens with positive focal power, the image side surface of which is a convex surface;

[0012] A sixth lens with negative focal power;

[0013] A seventh lens with positive focal power, the image side surface of which is a convex surface;

[0014] An eighth lens with negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface;

[0015] Wherein, the object side surface curvature radius R7 of the fourth lens and the image side surface curvature radius R8 of the fourth lens satisfy: 0<(R7-R8) / (R7+R8)<0.6, and the object side surface curvature radius R15 of the eighth lens and the image side surface curvature radius R16 of the eighth lens satisfy: -1<(R15+R16) / (R15-R16)<-0.6.

[0016] Further preferably, an optical total track length TTL of the optical lens and an effective focal length f of the optical lens satisfy: 4.2 < TTL / f < 8; the optical total track length TTL of the optical lens and a real image height IH corresponding to a maximum field angle of the optical lens satisfy: 2.5 < TTL / IH < 3.9.

[0017] Further preferably, a maximum field angle FOV of the optical lens and an aperture value FNO of the optical lens satisfy: 39° < FOV / FNO < 85°; a real image height IH corresponding to the maximum field angle of the optical lens and an entrance pupil diameter EPD of the optical lens satisfy: 2.7 < IH / EPD < 5.7.

[0018] Further preferably, a real image height IH corresponding to a maximum field angle of the optical lens and an effective focal length f of the optical lens satisfy: 1.3 < IH / f < 2.8; a back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.6 < BFL / f < 1.6.

[0019] Further preferably, an effective focal length f of the optical lens and a focal length f1 of the first lens satisfy: -2.5 < f1 / f < -1.1; the effective focal length f of the optical lens and a radius of curvature R1 of an object side surface of the first lens satisfy: 2.4 < R1 / f < 11.5; the effective focal length f of the optical lens and a radius of curvature R2 of an image side surface of the first lens satisfy: 0.6 < R2 / f < 1.7.

[0020] Further preferably, an effective focal length f of the optical lens and a focal length f4 of the fourth lens satisfy: -17.5 < f4 / f < -1.9; the effective focal length f of the optical lens and a radius of curvature R7 of an object side surface of the fourth lens satisfy: 1.4 < R7 / f < 4.4; the effective focal length f of the optical lens and a radius of curvature R8 of an image side surface of the fourth lens satisfy: 0.6 < R8 / f < 1.4.

[0021] Further preferably, an effective focal length f of the optical lens and a focal length f5 of the fifth lens satisfy: 1 < f5 / f < 1.8; the effective focal length f of the optical lens and a radius of curvature R10 of an image side surface of the fifth lens satisfy: -21 < R10 / f < -0.9.

[0022] Further preferably, an effective focal length f of the optical lens and a focal length f7 of the seventh lens satisfy: 0.7 < f7 / f < 2.3; the effective focal length f of the optical lens and a radius of curvature R14 of an image side surface of the seventh lens satisfy: -3.7 < R14 / f < -1.2.

[0023] It is further preferred that the effective focal length f of the optical lens and the focal length f8 of the eighth lens satisfy: -12.5 < f8 / f < -2.5; the object side curvature radius R15 of the eighth lens and the effective focal length f of the optical lens satisfy: -7.5 < R15 / f < -1.5; and the image side curvature radius R16 of the eighth lens and the effective focal length f of the optical lens satisfy: -1100 < R16 / f < -14.

[0024] It is further preferred that the combined focal length f45678 of 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: 1.3 < f45678 / f < 6.3; and the object side half light entrance radius d1 of the first lens and the image side half light entrance radius d16 of the eighth lens satisfy: 1.4 < d1 / d16 < 2.5.

[0025] Compared with the prior art, the optical lens provided by the application adopts eight lenses with specific optical powers, and 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 a large field of view, a large aperture, and high imaging quality. BRIEF DESCRIPTION OF DRAWINGS

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

[0027] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0028] Figure 2 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0029] Figure 3 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0030] Figure 4 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0031] Figure 5 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0032] Figure 6 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0033] Figure 7 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0034] FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.Figure 8 F-Tan(Theta) Distortion curve of the optical lens in Embodiment 2 of the present application.

[0035] Figure 9 Axial aberration curve of the optical lens in Embodiment 2 of the present application.

[0036] Figure 10 Decentration curve of the optical lens in Embodiment 2 of the present application.

[0037] Figure 11 MTF curve of the optical lens in Embodiment 2 of the present application.

[0038] Figure 12 Relative illuminance curve of the optical lens in Embodiment 2 of the present application.

[0039] Figure 13 Structure diagram of the optical lens in Embodiment 3 of the present application.

[0040] Figure 14 F-Tan(Theta) Distortion curve of the optical lens in Embodiment 3 of the present application.

[0041] Figure 15 Axial aberration curve of the optical lens in Embodiment 3 of the present application.

[0042] Figure 16 Decentration curve of the optical lens in Embodiment 3 of the present application.

[0043] Figure 17 MTF curve of the optical lens in Embodiment 3 of the present application.

[0044] Figure 18 Relative illuminance curve of the optical lens in Embodiment 3 of the present application.

[0045] Figure 19 Structure diagram of the optical lens in Embodiment 4 of the present application.

[0046] Figure 20 F-Tan(Theta) Distortion curve of the optical lens in Embodiment 4 of the present application.

[0047] Figure 21 Axial aberration curve of the optical lens in Embodiment 4 of the present application.

[0048] Figure 22 Decentration curve of the optical lens in Embodiment 4 of the present application.

[0049] Figure 23 MTF curve of the optical lens in Embodiment 4 of the present application.

[0050] Figure 24 Relative illuminance curve of the optical lens in Embodiment 4 of the present application.

[0051] Figure 25 Structural schematic diagram of the optical lens in Embodiment 5 of the present application.

[0052] Figure 26 F-Tan(Theta) distortion curve of the optical lens in Embodiment 5 of the present application.

[0053] Figure 27 Axial aberration curve of the optical lens in Embodiment 5 of the present application.

[0054] Figure 28 Decentration curve of the optical lens in Embodiment 5 of the present application.

[0055] Figure 29 MTF curve of the optical lens in Embodiment 5 of the present application.

[0056] Figure 30 Relative illuminance curve of the optical lens in Embodiment 5 of the present application.

[0057] Figure 31 Structural schematic diagram of the optical lens in Embodiment 6 of the present application.

[0058] Figure 32 F-Tan(Theta) distortion curve of the optical lens in Embodiment 6 of the present application.

[0059] Figure 33 Axial aberration curve of the optical lens in Embodiment 6 of the present application.

[0060] Figure 34 Decentration curve of the optical lens in Embodiment 6 of the present application.

[0061] Figure 35 MTF curve of the optical lens in Embodiment 6 of the present application.

[0062] Figure 36 Relative illuminance curve of the optical lens in Embodiment 6 of the present application.

[0063] Figure 37 Structural schematic diagram of the optical lens in Embodiment 7 of the present application.

[0064] Figure 38 F-Tan(Theta) distortion curve of the optical lens in Embodiment 7 of the present application.

[0065] Figure 39 Axial aberration curve of the optical lens in Embodiment 7 of the present application.

[0066] Figure 40 A graph of the lateral chromatic aberration curve of the optical lens in Embodiment 7 of the present application.

[0067] Figure 41 A graph of the MTF curve of the optical lens in Embodiment 7 of the present application.

[0068] Figure 42 A graph of the relative luminance curve of the optical lens in Embodiment 7 of the present application.

[0069] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0070] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be noted that these detailed descriptions are only descriptions of embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0071] It is to be noted that, in the present specification, the expressions first, second, third and the like are used only to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0072] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0073] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0074] It should also be understood that the use of the terms "have", "has", "having", "include", "includes", "including", "comprise", "comprises" and / or "comprising", when appearing in the specification, is taken as referring to the existence of the stated features, elements and / or components, but does not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. Further, when referring to a list of features, the expression "at least one of" is intended to mean any one of the features from the list, but not necessarily including more than one of the features, individually or in combination with other features. Furthermore, the use of the term "about" in relation to a numerical value means that the value is + / - 10% of the value.

[0075] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0076] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other, without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0077] The optical lens provided by the embodiment of the present application is composed of eight lenses, which are sequentially arranged along the optical axis from the object side to the imaging surface as the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens.

[0078] In some embodiments, the first lens can have a negative focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; the second lens can have a negative focal power, the object side surface of which can be a concave surface or a convex surface, and the image side surface of which can be a concave surface or a convex surface. The third lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which can be a concave surface or a convex surface. The fourth lens can have a negative focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface. The fifth lens can have a positive focal power, the object side surface of which can be a concave surface or a convex surface, and the image side surface of which is a convex surface. The sixth lens can have a negative focal power, the object side surface of which can be a concave surface or a convex surface, and the image side surface of which can be a concave surface or a convex surface. The seventh lens can have a positive focal power, the object side surface of which can be a concave surface or a convex surface, and the image side surface of which is a convex surface. The eighth lens can have a negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface.

[0079] In some embodiments, the optical lens can further include a diaphragm, which can be located between the third lens and the fourth lens. It can be understood that the diaphragm can be used to limit the amount of light entering, so as to change the brightness of the imaging.

[0080] In some embodiments, the optical lens can further include a filter, which can be disposed between the eighth lens and the imaging surface. The filter is used to filter out interference light, preventing the interference light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0081] In some embodiments, the sixth lens and the seventh lens can be cemented together to form a cemented lens, which can effectively correct chromatic aberration of the optical lens, reduce the sensitivity of the optical lens to decentration, balance aberration of the optical lens, and improve the imaging quality of the optical lens. In addition, the cemented lens can reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0082] In some embodiments, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy 0 < (R7-R8) / (R7+R8) < 0.6, and the curvature radius R15 of the object side surface of the eighth lens and the curvature radius R16 of the image side surface of the eighth lens satisfy -1 < (R15+R16) / (R15-R16) < -0.6. Satisfying the above ranges can correct the aberration of the optical lens, ensure smooth light ray trend through the fourth and eighth lenses, reduce the tolerance sensitivity of the optical lens, and facilitate smooth light ray entry. More specifically, 0.09 < (R7-R8) / (R7+R8) < 0.52, and -1 < (R15+R16) / (R15-R16) < -0.68.

[0083] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy 4.2 < TTL / f < 8, and the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy 2.5 < TTL / IH < 3.9. Satisfying the above ranges can help the optical lens achieve a balance between the total length and the volume by reasonably controlling the total length, the focal length, and the image height of the optical lens, and facilitate improving the structural stability of the optical lens. More specifically, 4.67 < TTL / f < 7.73, and 2.78 < TTL / IH < 3.58.

[0084] In some embodiments, the maximum field angle FOV of the optical lens and the aperture value FNO of the optical lens satisfy 39° < FOV / FNO < 85°, and the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy 2.7 < IH / EPD < 5.7. Satisfying the above ranges can help achieve the characteristics of a large field angle and a large aperture of the optical lens, and facilitate increasing the light quantity and improving the relative luminance. More specifically, 39.9° < FOV / FNO < 80.1°, and 2.9 < IH / EPD < 5.18.

[0085] In some embodiments, a real image height IH corresponding to a maximum field of view angle of the optical lens satisfies: 1.3 < IH / f < 2.8, and a back focal length BFL of the optical lens satisfies: 0.6 < BFL / f < 1.6. Satisfying the above ranges can reasonably control the image height, focal length and back focal length of the optical lens, and under the condition of fixed focal length, can improve the characteristics of large target surface and long back focal length of the optical lens. The characteristics of large target surface help to improve the imaging quality of the optical lens, and the characteristics of long back focal length can meet the arrangement requirements of the rear chip and reduce the assembly and processing difficulty. More specifically, 1.45 < IH / f < 2.6, and 0.69 < BFL / f < 1.45.

[0086] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.5 < f1 / f < -1.1, the effective focal length f of the optical lens and the object side curvature radius R1 of the first lens satisfy: 2.4 < R1 / f < 11.5, and the effective focal length f of the optical lens and the image side curvature radius R2 of the first lens satisfy: 0.6 < R2 / f < 1.7. Satisfying the above ranges makes the first lens have appropriate negative refractive power and reasonable surface type matching, which helps to collect as much light as possible into the optical lens to obtain more picture information, and can control the trend of edge large-angle light to improve the imaging quality of the optical lens. More specifically, -2.36 < f1 / f < -1.18, 2.59 < R1 / f < 10.49, and 0.72 < R2 / f < 1.56.

[0087] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -17.5 < f4 / f < -1.9, the effective focal length f of the optical lens and the object side curvature radius R7 of the fourth lens satisfy: 1.4 < R7 / f < 4.4, and the effective focal length f of the optical lens and the image side curvature radius R8 of the fourth lens satisfy: 0.6 < R8 / f < 1.4. Satisfying the above ranges can reasonably control the focal length ratio and surface type of the fourth lens, which helps to collect light emitted through the front end lens, and makes the collected light smoothly enter the rear lenses, and is conducive to improving the resolving power of the optical lens. More specifically, -16.2 < f4 / f < -2.11, 1.58 < R7 / f < 4.03, and 0.66 < R8 / f < 1.32.

[0088] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 1 < f5 / f < 1.8; the effective focal length f of the optical lens and the image-side surface curvature radius R10 of the fifth lens satisfy: -21 < R10 / f < -0.9. By satisfying the above ranges, by reasonably controlling the focal length ratio and the surface shape of the fifth lens, the light ray trend of the front end lens is gently controlled, the aberration generated by the front end lens is corrected, and the imaging quality is improved. More specifically, 1.03 < f5 / f < 1.69; -19.6 < R10 / f < -0.98.

[0089] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 0.7 < f7 / f < 2.3; the effective focal length f of the optical lens and the image-side surface curvature radius R14 of the seventh lens satisfy: -3.7 < R14 / f < -1.2. By satisfying the above ranges, by reasonably setting the focal length and the surface shape of the seventh lens, the chromatic aberration of the system can be better corrected in cooperation with the sixth lens, and the overall imaging quality is improved. More specifically, 0.73 < f7 / f < 2.1; -3.43 < R14 / f < -1.32.

[0090] In some embodiments, the effective focal length f of the optical lens and the focal length f8 of the eighth lens satisfy: -12.5 < f8 / f < -2.5; the object-side surface curvature radius R15 of the eighth lens and the effective focal length f of the optical lens satisfy: -7.5 < R15 / f < -1.5; the image-side surface curvature radius R16 of the eighth lens and the effective focal length f of the optical lens satisfy: -1100 < R16 / f < -14. By satisfying the above ranges, by reasonably controlling the focal length ratio of the eighth lens, the light ray trend to the image plane is controlled to be stable, the characteristics of a large target surface are obtained, and the optical lens is ensured to have high resolving power on the basis of eliminating ghost images, and the imaging quality of the optical lens is improved. More specifically, -11.65 < f8 / f < -2.72; -6.83 < R15 / f < -1.66; -1045.4 < R16 / f < -14.72.

[0091] In some embodiments, the combined focal length f45678 of 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: 1.3 < f45678 / f < 6.3. By satisfying the above ranges, by reasonably setting the positive refractive power of the stop rear lens group, the distortion and astigmatism generated by the front end lens of the optical lens are balanced, and the imaging quality of the optical lens is improved. More specifically, 1.4 < f45678 / f < 5.84.

[0092] In some embodiments, the first lens satisfies: 1.4 < d1 / d16 < 2.5, where d1 is the half entrance pupil diameter of the object side of the first lens, and d16 is the half entrance pupil diameter of the image side of the eighth lens. By controlling the ratio of the aperture of the front and rear lenses within the above range, the light path is limited within a reasonable range, and the illumination uniformity of the imaging surface is improved. More specifically, 1.56 < d1 / d16 < 2.33.

[0093] In some embodiments, the optical lens satisfies: 50° < f x FOV / IH < 80°, where f is the effective focal length of the optical lens, FOV is the maximum field of view of the optical lens, and IH is the real image height corresponding to the maximum field of view of the optical lens. By reasonably limiting the relationship among the focal length, the field of view, and the image height of the optical lens, the balance between the large field of view and the large target surface imaging of the optical lens is achieved. More specifically, 54.1° < f x FOV / IH < 74°.

[0094] In some embodiments, the optical lens satisfies: 0.2 < d1 / (IH / 2) / tan(FOV / 2) < 1.6, where d1 is the half entrance pupil diameter of the object side of the first lens, IH is the real image height corresponding to the maximum field of view of the optical lens, and FOV is the maximum field of view of the optical lens. By satisfying the above range, the optical lens has a large field of view and a large image surface while the front end has a small aperture. More specifically, 0.27 < d1 / (IH / 2) / tan(FOV / 2) < 1.48.

[0095] In some embodiments, the optical lens satisfies: -23.5 < f2 / f < -1.6, where f is the effective focal length of the optical lens, and f2 is the focal length of the second lens. By setting the second lens to have a suitable negative focal length, the light rays are smoothly introduced into the rear lenses, and the light path is stable. More specifically, -21.31 < f2 / f < -1.76.

[0096] In some embodiments, the optical lens satisfies: 1.1 < f3 / f < 3.5, and 1.2 < R5 / f < 2.5, where f is the effective focal length of the optical lens, f3 is the focal length of the third lens, and R5 is the curvature radius of the object side of the third lens. By setting the third lens to have a suitable positive focal length and surface shape, the light rays are converged, and the lens shape is smooth, which is beneficial to reducing the volume and cost. More specifically, 1.18 < f3 / f < 3.24, and 1.27 < R5 / f < 2.3.

[0097] In some embodiments, the optical lens satisfies: -1.9 < f6 / f < -0.9, where f is the effective focal length of the optical lens, and f6 is the focal length of the sixth lens. By setting the focal length of the sixth lens within the above range, the aberration of the edge field of view is effectively improved, and the overall imaging quality of the optical lens is improved. More specifically, -1.76 < f6 / f < -0.93.

[0098] In some embodiments, the optical lens satisfies the condition formula: 2.3mm<f<3.3mm, 1.1mm<EPD<1.6mm, 14mm<TTL<21mm, 1.8<FNO<2.2, 14°<CRA<20°, 1.7mm<BFL<4.5mm, 79°<FOV<170°, 4.3mm<IH<7mm; wherein f represents the effective focal length of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total track length of the optical lens, FNO represents the aperture value of the optical lens, CRA represents the chief ray angle of incidence at the maximum image height of the optical lens, BFL represents the back focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, and IH represents the real image height corresponding to the maximum field of view angle of the optical lens. Satisfying the above condition indicates that the optical lens provided by the embodiments of the present application at least has the characteristics of large field of view angle, large aperture, high imaging quality, etc. More specifically, 2.48mm<f<3.03mm, 1.24mm<EPD<1.52mm, 14.12mm<TTL<20.1mm, 1.9<FNO<2.1, 14.74°<CRA<19.97°, 1.8mm<BFL<4.13mm, 79°<FOV<161°, 4.39mm<IH<6.47mm.

[0099] In some embodiments, the lens material in the optical lens provided by the present application can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. 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. In the optical lens provided by the present application, the first lens, the second lens, the fifth lens, the sixth lens and the seventh lens are glass lenses, the fourth lens is a glass lens or a plastic lens, and the third lens and the eighth lens are plastic lenses.

[0100] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth 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 third lens, the fourth lens, the fifth lens and the eighth lens of the present application are aspherical lenses, and the first lens, the second lens, the sixth lens and the seventh lens are spherical lenses.

[0101] In various embodiments of the present application, when the lens is an aspherical lens, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0102]

[0103] wherein z is the distance of the curved surface to the vertex of the curved surface in the direction of the optical axis, h is the distance of the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the coefficient of the quadratic curved surface, and B, C, D, E, F, G, and H are the coefficients of the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order curved surfaces, respectively.

[0104] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are merely the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, and any change, substitution, combination, or simplification made without departing from the innovative points of the application should be regarded as equivalent replacement, and should be included in the protection scope of the application.

[0105] Embodiment 1

[0106] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens 100 provided in the embodiment 1 of the application. The optical lens includes, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a third lens L3, a stop ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter G1.

[0107] The first lens L1 has a negative focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface.

[0108] The second lens L2 has a negative focal power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.

[0109] The third lens L3 has a positive focal power, the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.

[0110] The fourth lens L4 has a negative focal power, the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.

[0111] The fifth lens L5 has a positive focal power, the object side surface S9 is a convex surface, and the image side surface S10 is a convex surface at the near optical axis.

[0112] The sixth lens L6 has a negative focal power, the object side surface S11 is a convex surface, and the image side surface is a concave surface.

[0113] The seventh lens L7 has a positive focal power, the object side surface is a convex surface, and the image side surface S13 is a convex surface.

[0114] The sixth lens L6 and the seventh lens L7 form a cemented lens group with positive refractive power, i.e., the cemented surface of the image side surface of the sixth lens L6 and the object side surface of the seventh lens L7 is S13;

[0115] The eighth lens L8 has negative refractive power, the object side surface S14 is a concave surface, and the image side surface S15 is a convex surface.

[0116] The object side surface S16 and the image side surface S17 of the filter G1 are both flat surfaces;

[0117] The imaging surface S18 is a flat surface.

[0118] The first lens L1, the second lens L2, the sixth lens L6 and the seventh lens L7 are all glass spherical lenses, the fifth lens L5 is a glass aspherical lens, and the third lens L3, the fourth lens L4 and the eighth lens L8 are all plastic aspherical lenses.

[0119] The related parameters of the lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0120] Table 1-1

[0121]

[0122] The surface type parameters of the aspherical lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0123] Table 1-2

[0124] Surface No. K B C D E F G H S5 -8.63E+00 3.45E-03 2.35E-03 6.36E-04 -1.19E-03 7.18E-04 -1.53E-04 1.23E-05 S6 -2.00E+02 1.24E-02 5.16E-03 -1.12E-02 7.91E-03 -2.87E-03 6.06E-04 -5.26E-05 S7 8.58E+00 4.62E-03 -5.21E-03 5.01E-03 -3.40E-03 -1.66E-04 4.89E-04 -1.10E-04 S8 -1.25E+01 -8.13E-03 2.63E-03 1.56E-04 -1.56E-04 -2.86E-04 -2.27E-05 1.72E-05 S9 -9.68E+00 -9.38E-03 8.44E-04 -1.63E-05 -8.27E-06 6.17E-05 0.00E+00 0.00E+00 S10 -5.54E+39 -7.15E-04 -2.76E-03 -2.20E-06 1.57E-04 9.90E-05 0.00E+00 0.00E+00 S14 6.26E+00 -1.87E-02 2.51E-03 1.26E-04 -1.85E-04 8.86E-06 1.89E-05 -2.12E-06 S15 2.18E+03 -1.40E-02 2.75E-03 -1.71E-04 -5.98E-05 3.57E-06 5.28E-06 -6.28E-07

[0125] Figure 2 The F-Tan(Theta) distortion curve of the optical lens 100 in this embodiment is shown, which represents the distortion of different field angles on the imaging surface. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the change of the distortion value is relatively stable with the increase of the field angle, which shows that the optical lens 100 can correct the distortion well.

[0126] Figure 3 The axial aberration curve of the optical lens 100 in this embodiment is shown, which represents the axial aberration of each wavelength on the optical axis at the imaging surface. The horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within-0.08mm-0.06mm, which shows that the optical lens 100 can correct the axial aberration well.

[0127] Figure 4A curve diagram of the axial chromatic aberration of the optical lens 100 in the embodiment is shown, which represents the chromatic aberration of each wavelength at different image heights on the imaging surface relative to the central wavelength (0.555 μm), the horizontal axis represents the axial chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the diagram, the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2 μm-5 μm, which indicates that the optical lens 100 can better correct chromatic aberration.

[0128] Figure 5 A modulation transfer function (MTF) curve diagram of the optical lens 100 in the embodiment 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. As can be seen from the diagram, the MTF value of the embodiment is above 0.3 within the full field of view, and the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has better imaging quality and better detail resolution capability in the case of low frequency and high frequency.

[0129] Figure 6 A relative luminance curve of the optical lens 100 in the embodiment is shown, which represents the relative luminance value of different field angles on the imaging surface, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative luminance (unit: %). As can be seen from the diagram, the relative luminance value of the optical lens is still greater than 78% at the maximum half field angle, which indicates that the optical lens has better relative luminance.

[0130] Embodiment 2

[0131] Please refer to Figure 7 , which is a structural schematic diagram of the optical lens 200 provided in the embodiment 2 of the application. Compared with the embodiment 1, the main difference is that the image side surface S6 of the third lens L3 is a convex surface, and the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0132] The related parameters of each lens in the optical lens 200 in the embodiment 2 are shown in Table 2-1.

[0133] Table 2-1

[0134]

[0135] The surface type parameters of the aspheric lens of the optical lens 200 in the embodiment 2 are shown in Table 2-2.

[0136] Table 2-2

[0137] Surface No. K B C D E F G H S5 -6.73E+00 3.03E-03 1.64E-03 6.75E-04 -1.19E-03 6.87E-04 -1.66E-04 1.48E-05 S6 -4.37E+01 1.38E-02 5.72E-03 -1.09E-02 7.88E-03 -2.94E-03 5.85E-04 -4.77E-05 S7 8.64E+00 6.70E-03 -4.37E-03 5.26E-03 -3.34E-03 -1.49E-04 4.92E-04 -1.10E-04 S8 -1.08E+01 -8.44E-03 2.43E-03 2.54E-04 -9.18E-05 -2.71E-04 -2.10E-05 1.67E-05 S9 -9.05E+00 -9.23E-03 9.16E-04 -1.41E-05 -1.63E-05 6.12E-05 0.00E+00 0.00E+00 S10 2.00E+02 -1.68E-03 -2.39E-03 1.13E-04 1.83E-04 9.35E-05 0.00E+00 0.00E+00 S14 5.92E+00 -1.90E-02 2.77E-03 9.20E-05 -1.95E-04 2.19E-05 2.73E-05 -1.15E-06 S15 -7.93E+03 -1.12E-02 2.77E-03 -8.19E-05 -4.35E-05 -8.12E-06 3.76E-07 2.73E-06

[0138] In the embodiment, the F-Tan (Theta) distortion curve, axial aberration curve, transverse aberration curve, MTF curve and relative illumination diagram of the optical lens 200 are shown in Figs. 1-4, respectively. Figure 8 to Figure 12

[0139] As can be seen from Fig. 1, the change of the distortion value is relatively stable with the increase of the field angle, which indicates that the optical lens 200 can correct the distortion well. Figure 8

[0140] As can be seen from Fig. 2, the shift of the axial aberration is controlled within -0.07mm-0.08mm, which indicates that the optical lens 200 can correct the axial aberration well. Figure 9

[0141] As can be seen from Fig. 3, the transverse aberration of the longest wavelength and the shortest wavelength is controlled within -2um-4um, which indicates that the optical lens 200 can correct the chromatic aberration well. Figure 10

[0142] As can be seen from Fig. 4, the MTF value of the embodiment is above 0.28 in the full field of view, and the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view, which indicates that the optical lens 200 has good imaging quality and good detail resolution ability in the low frequency and high frequency cases. Figure 11

[0143] As can be seen from Fig. 5, the relative illumination value of the optical lens is still greater than 75% at the maximum half field angle, which indicates that the optical lens 200 has good relative illumination. Figure 12

[0144] Embodiment 3

[0145] As shown in Fig. 1, which is a structural schematic diagram of an optical lens 300 provided in the embodiment 3 of the present application, the main difference between the embodiment 3 and the embodiment 1 is that the object side S3 of the second lens L2 is a concave surface, and the optical parameters such as the curvature radius and the lens thickness of each lens surface are different. Figure 13 The related parameters of each lens in the optical lens 300 in the embodiment 3 are shown in Table 3-1.

[0146] Table 3-1

[0147]

[0148]

[0149] The surface type parameters of the aspheric lens of the optical lens 300 in the embodiment 3 are shown in Table 3-2.

[0150] Table 3-2

[0151] ​​​​​​​

[0152] Surface No. K B C D E F G H S5 1.01E+00 3.38E-03 1.39E-04 9.44E-04 -7.81E-04 3.63E-04 -7.50E-05 5.50E-06 S6 2.00E+02 1.60E-02 7.46E-03 -8.35E-03 6.20E-03 -2.04E-03 3.70E-04 -6.60E-05 S7 -4.93E+01 4.40E-03 -1.31E-02 5.02E-03 -7.31E-04 -4.89E-04 9.55E-05 8.12E-06 S8 -7.10E+00 -5.48E-03 1.09E-03 -4.01E-04 -3.09E-05 1.24E-05 8.46E-08 -2.44E-07 S9 -2.19E+01 -5.10E-03 6.84E-04 -8.04E-06 4.44E-06 -2.45E-06 0.00E+00 0.00E+00 S10 -7.01E-01 -4.04E-03 -5.27E-04 4.57E-05 -3.34E-05 4.33E-06 0.00E+00 0.00E+00 S14 -1.20E+01 -1.59E-02 4.82E-04 2.07E-05 -3.53E-06 -9.54E-07 1.91E-08 4.14E-09 S15 -8.15E+06 -1.17E-02 2.73E-04 2.39E-05 -2.58E-06 -5.38E-07 6.23E-08 -1.89E-09

[0153] In the embodiment, the F-Tan(Theta) distortion curve, axial aberration curve, transverse aberration curve, MTF curve and relative illumination diagram of the optical lens 300 are shown in FIGS. 6A, 6B, 6C, 6D and 6E respectively. Figure 14 to Figure 18

[0154] As can be seen from FIG. 6A, the change of the distortion value is relatively stable as the field angle increases, which indicates that the optical lens 300 can correct the distortion well. Figure 14

[0155] As can be seen from FIG. 6B, the shift of the axial aberration is controlled within -0.08mm-0.04mm, which indicates that the optical lens 300 can correct the axial aberration well. Figure 15

[0156] As can be seen from FIG. 6C, the transverse aberration of the longest wavelength and the shortest wavelength is controlled within -1um-4um, which indicates that the optical lens 300 can correct the chromatic aberration well. Figure 16

[0157] As can be seen from FIG. 6D, the MTF value of the embodiment is above 0.4 in the full field of view, and the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view, which indicates that the optical lens has good imaging quality and good detail resolution ability in the case of low frequency and high frequency. Figure 17

[0158] As can be seen from FIG. 6E, the relative illumination value of the optical lens is still greater than 95% at the maximum half field of view, which indicates that the optical lens has good relative illumination. Figure 18 Embodiment 4

[0159] Please refer to FIG. 6, which is a structural schematic diagram of an optical lens 400 provided in the embodiment 4 of the present application. Compared with the embodiment 1, the main difference is that the object side S3 of the second lens L2 is a concave surface, the image side S6 of the third lens L3 is a convex surface, the object side S9 of the fifth lens L5 is a concave surface, the object side S11 of the sixth lens L6 is a concave surface, and the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0160] Figure 19 The related parameters of each lens in the optical lens 400 in the embodiment 4 are shown in Table 4-1.

[0161] Table 4-1

[0162] Table 4-1

[0163]

[0164] ​​​​​​The surface profile parameters of the aspherical lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0165] Table 4-2

[0166] Surface No. K B C D E F G H S5 6.47E-01 1.22E-03 7.28E-04 6.19E-04 -5.89E-04 3.06E-04 -7.39E-05 6.54E-06 S6 -2.10E+01 -1.16E-02 1.12E-02 -5.93E-03 3.46E-03 -1.80E-03 5.42E-04 -6.64E-05 S7 -1.02E+02 5.71E-03 -2.10E-02 4.80E-03 6.93E-04 -6.38E-04 -5.58E-04 2.29E-04 S8 -1.69E+01 -1.88E-02 -1.85E-03 2.97E-05 -7.73E-05 -2.98E-05 -1.76E-05 1.73E-05 S9 -2.00E+02 -2.04E-02 2.15E-03 1.37E-04 -1.64E-04 1.07E-04 0.00E+00 0.00E+00 S10 -1.72E-01 -5.88E-03 -4.70E-04 -1.21E-04 1.85E-05 2.34E-05 0.00E+00 0.00E+00 S14 4.64E+01 -8.81E-03 -4.31E-04 -1.10E-04 -7.32E-06 8.41E-07 3.39E-07 -2.16E-07 S15 2.00E+02 -8.98E-03 -6.14E-04 4.58E-05 -3.29E-06 -3.95E-07 6.61E-08 -6.04E-09

[0167] In this embodiment, the F-Tan (Theta) distortion curve, axial aberration curve, transverse chromatic aberration curve, MTF curve, and relative illumination diagram of the optical lens 400 are respectively as follows: Figure 20 to Figure 24 As shown.

[0168] from Figure 20 As can be seen, the distortion value changes relatively smoothly as the field of view increases, indicating that the optical lens 400 can correct distortion well.

[0169] from Figure 21 As can be seen, the axial aberration offset is controlled within -0.02mm to 0.02mm, indicating that the optical lens 400 can correct axial aberration well.

[0170] from Figure 22 As can be seen, the chromatic aberration of the longest and shortest wavelengths is controlled within -1μm to 3μm, indicating that the optical lens 400 can correct chromatic aberration well.

[0171] from Figure 23 As can be seen, the MTF value of this embodiment is above 0.45 throughout the entire field of view. The MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good imaging quality and good detail resolution in both low and high frequency conditions.

[0172] from Figure 24 As can be seen, the relative illumination value of the optical lens is still greater than 80% at the maximum half field of view, indicating that the optical lens has good relative illumination.

[0173] Example 5

[0174] Please see Figure 25 The diagram shows a schematic of the optical lens 500 provided in Embodiment 5 of the present invention. The main differences between this embodiment and Embodiment 1 are as follows: the sixth lens L6 and the seventh lens L7 form a cemented lens group with negative optical power; the object-side surface S3 of the second lens L2 is concave; the object-side surface S11 of the sixth lens L6 is concave; the image-side surface S12 of the sixth lens L6 is convex; the object-side surface S13 of the seventh lens L7 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0175] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0176] Table 5-1

[0177]

[0178]

[0179] The surface profile parameters of the aspherical lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0180] Table 5-2

[0181] Surface No. K B C D E F G H S5 6.30E-01 2.82E-03 -1.53E-04 9.05E-04 -8.12E-04 3.49E-04 -7.22E-05 5.73E-06 S6 7.75E+00 1.46E-02 9.23E-03 -8.51E-03 5.99E-03 -2.18E-03 3.54E-04 -1.62E-05 S7 -2.88E+01 1.62E-02 -8.62E-03 4.36E-03 -1.04E-03 -4.22E-04 2.31E-04 -6.49E-05 S8 -1.91E+01 -1.67E-02 -1.41E-03 -9.14E-04 -6.00E-05 5.49E-05 7.23E-07 -2.65E-05 S9 -2.27E+01 -1.09E-02 -1.69E-03 -4.77E-04 -1.85E-05 -1.68E-05 0.00E+00 0.00E+00 S10 -7.54E-01 -4.23E-03 -8.31E-04 -1.70E-05 -6.20E-05 9.70E-06 0.00E+00 0.00E+00 S14 -7.28E+00 -1.39E-02 5.61E-04 -3.42E-06 -3.69E-06 1.76E-09 2.17E-07 -6.59E-08 S15 -2.00E+02 -9.41E-03 9.26E-05 1.71E-05 -1.86E-06 -6.56E-07 1.27E-08 -1.94E-09

[0182] In this embodiment, the F-Tan (Theta) distortion curve, axial aberration curve, transverse chromatic aberration curve, MTF curve, and relative illumination diagram of the optical lens 500 are respectively as follows: Figure 26 to Figure 30 As shown.

[0183] from Figure 26 As can be seen, the distortion value changes relatively smoothly as the field of view increases, indicating that the optical lens 500 can correct distortion well.

[0184] from Figure 27 As can be seen, the axial aberration offset is controlled within -0.02mm to 0.03mm, indicating that the optical lens 500 can correct axial aberration well.

[0185] from Figure 28 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -1μm to 4μm, indicating that the optical lens 500 can correct chromatic aberration well.

[0186] from Figure 29 As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. The MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good imaging quality and good detail resolution in both low and high frequency conditions.

[0187] from Figure 30 As can be seen, the relative illumination value of the optical lens is still greater than 90% at the maximum half field of view, indicating that the optical lens has good relative illumination.

[0188] Example 6

[0189] Please see Figure 31, and the structure schematic diagram of the optical lens 600 provided in the embodiment 6 of the present application is shown. Compared with the embodiment 1, the main difference is that the object side S3 of the second lens L2 is a concave surface; the image side S4 of the second lens L2 is a convex surface; the image side S6 of the third lens L3 is a convex surface; the object side S11 of the sixth lens L6 is a concave surface; and the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0190] The related parameters of each lens in the optical lens 600 in the embodiment 6 are shown in Table 6-1.

[0191] Table 6-1

[0192]

[0193] The surface type parameters of the aspheric lens of the optical lens 600 in the embodiment 6 are shown in Table 6-2.

[0194] Table 6-2

[0195] Surface No. K B C D E F G H S5 4.34E-01 5.73E-03 9.82E-05 1.14E-03 -6.24E-04 3.52E-04 -1.04E-04 1.40E-05 S6 -3.68E+01 1.24E-02 7.83E-03 -7.61E-03 5.32E-03 -2.05E-03 4.32E-04 -2.81E-05 S7 -9.58E+01 7.60E-03 -1.28E-02 5.33E-03 -7.92E-04 -4.43E-04 7.79E-05 2.60E-05 S8 -8.46E+00 -2.27E-03 7.83E-04 -1.16E-03 -1.71E-04 3.44E-05 1.71E-05 -6.05E-06 S9 -3.16E+02 -4.40E-03 6.96E-04 -4.08E-05 6.07E-06 -5.25E-05 0.00E+00 0.00E+00 S10 -5.29E-01 -5.17E-03 2.12E-04 -5.55E-05 -2.56E-05 1.06E-05 0.00E+00 0.00E+00 S14 -1.17E+01 -1.11E-02 -7.07E-06 -9.28E-05 1.08E-05 7.17E-07 -9.46E-07 7.52E-08 S15 9.98E+02 -7.94E-03 -1.71E-04 2.66E-05 -3.66E-07 -5.09E-07 4.83E-08 -1.67E-09

[0196] In the present embodiment, the F-Tan(Theta) distortion curve, the axial aberration curve, the transverse aberration curve, the MTF curve, and the relative illumination diagram of the optical lens 600 are respectively shown in Figure 32 to Figure 36 .

[0197] As can be seen from Figure 32 , the change of the distortion value is relatively stable with the increase of the field angle, which shows that the optical lens 600 can better correct the distortion.

[0198] As can be seen from Figure 33 , the shift amount of the axial aberration is controlled within-0.08mm-0.04mm, which shows that the optical lens 600 can better correct the axial aberration.

[0199] As can be seen from Figure 34 , the transverse aberration of the longest wavelength and the shortest wavelength is controlled within 0-5μm, which shows that the optical lens 600 can better correct the chromatic aberration.

[0200] As can be seen from Figure 35 , the MTF value of the present embodiment is all above 0.48 within the full field of view, and the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view, which has better imaging quality and better detail resolution ability in the case of low frequency and high frequency.

[0201] As can be seen from Figure 36 , the relative illumination value of the optical lens is still greater than 90% at the maximum half field angle, which shows that the optical lens has better relative illumination.

[0202] Embodiment 7

[0203] Please refer to Figure 37 , which is a structural schematic diagram of the optical lens 700 provided in Embodiment 7 of the present application. Compared with Embodiment 1, the main difference is that the object side S3 of the second lens L2 is a concave surface; the image side S6 of the third lens L3 is a convex surface; the object side S11 of the sixth lens L6 is a concave surface; and the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0204] The related parameters of each lens in the optical lens 700 in Embodiment 7 are shown in Table 7-1.

[0205] Table 7-1

[0206]

[0207]

[0208] The surface type parameters of the aspherical lens of the optical lens 700 in Embodiment 7 are shown in Table 7-2.

[0209] Table 7-2

[0210] Surface No. K B C D E F G H S5 4.53E-01 5.76E-03 2.29E-04 1.23E-03 -6.23E-04 3.44E-04 -1.05E-04 1.61E-05 S6 -2.12E+01 1.19E-02 7.86E-03 -7.71E-03 5.30E-03 -2.04E-03 4.39E-04 -3.33E-05 S7 -6.21E+01 8.42E-03 -1.35E-02 5.05E-03 -8.01E-04 -4.33E-04 7.68E-05 2.54E-05 S8 -8.32E+00 -2.76E-03 9.95E-04 -1.12E-03 -1.62E-04 5.34E-05 2.66E-05 -1.00E-05 S9 -3.14E+02 -3.71E-03 8.28E-04 -1.70E-05 2.72E-05 -4.53E-05 0.00E+00 0.00E+00 S10 -5.70E-01 -4.91E-03 1.91E-04 -4.00E-05 -2.52E-05 7.94E-06 0.00E+00 0.00E+00 S14 -8.57E+00 -1.08E-02 4.61E-05 -9.85E-05 1.19E-05 1.14E-06 -9.79E-07 6.32E-08 S15 4.07E+03 -7.62E-03 -1.83E-04 2.59E-05 -4.78E-07 -5.25E-07 4.80E-08 -1.65E-09

[0211] In this embodiment, the F-Tan(Theta) distortion curve, the axial aberration curve, the transverse aberration curve, the MTF curve, and the relative luminance diagram of the optical lens 700 are shown in Figure 38 to Figure 42 , respectively.

[0212] As can be seen from Figure 38 , the change of the distortion value is relatively stable with the increase of the field angle, which indicates that the optical lens 700 can correct the distortion well.

[0213] As can be seen from Figure 39 , the shift amount of the axial aberration is controlled within-0.08mm-0.03mm, which indicates that the optical lens 700 can correct the axial aberration well.

[0214] As can be seen from Figure 40 , the transverse aberration of the longest wavelength and the shortest wavelength is controlled within 0-5μm, which indicates that the optical lens 700 can correct the chromatic aberration well.

[0215] As can be seen from Figure 41 , the MTF value of this embodiment is above 0.4 in the full field of view, and the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view, which has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0216] As can be seen fromFigure 42 It can be seen that the relative illumination value of the optical lens is still greater than 90% at the maximum half field angle, which indicates that the optical lens has a good relative illumination.

[0217] Referring to Table 8, the optical characteristics corresponding to the above-mentioned embodiments are shown, including the effective focal length f, the total optical length TTL, the aperture value FNO, the real image height IH corresponding to the maximum field angle, the chief ray angle of incidence CRA at the maximum image height, the maximum field angle FOV of the optical lens, and the numerical value corresponding to each conditional expression in the embodiments.

[0218] Table 8

[0219] Parameter and Condition Formula Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 f (mm) 2.86 3.02 2.52 2.57 2.59 2.49 2.51 EPD (mm) 1.43 1.51 1.26 1.28 1.30 1.25 1.25 TTL (mm) 17.46 14.13 18.00 18.00 20.00 18.00 18.00 FNO 2.00 2.00 2.00 2.00 2.00 2.00 2.00 CRA (°) 19.96 19.31 14.75 15.17 19.80 15.53 15.92 BFL (mm) 4.12 3.77 2.14 1.81 1.92 1.81 1.81 FOV (°) 100.00 80.00 160.00 139.46 160.00 160.00 160.00 IH (mm) 5.28 4.40 6.45 6.23 5.60 6.45 6.46 TTL / f 6.11 4.68 7.16 7.01 7.72 7.22 7.18 TTL / IH 3.30 3.21 2.79 2.89 3.57 2.79 2.79 FOV / FNO (°) 50.00 40.00 80.00 69.73 80.00 80.00 80.00 IH / EPD 3.70 2.91 5.13 4.85 4.33 5.17 5.16 IH / f 1.85 1.46 2.57 2.42 2.16 2.59 2.58 BFL / f 1.44 1.25 0.85 0.70 0.74 0.73 0.72 f x FOV / IH (°) 54.11 54.91 62.37 57.56 73.99 61.87 62.07 d1 / (IH / 2) / Tan(FOV / 2) 1.15 1.47 0.32 0.79 0.35 0.28 0.30 f1 / f -1.19 -1.22 -1.80 -1.86 -2.35 -2.20 -2.17 f2 / f -21.30 -18.70 -2.47 -1.77 -3.05 -7.08 -2.92 f3 / f 3.23 3.04 2.02 1.19 3.03 1.67 1.51 f4 / f -2.32 -2.12 -4.68 -3.09 -16.19 -2.15 -2.41 f5 / f 1.13 1.04 1.50 1.68 1.06 1.52 1.44 f6 / f -1.61 -1.18 -1.75 -1.03 -1.32 -0.94 -1.01 f7 / f 0.91 0.74 1.32 1.00 2.09 1.01 1.02 f8 / f -3.27 -2.73 -5.12 -11.64 -5.09 -5.68 -4.74 f45678 / f 1.48 1.41 1.76 2.73 1.82 5.83 3.66 R1 / f 7.44 2.60 5.07 3.54 10.48 4.02 4.00 R2 / f 0.91 0.73 1.07 0.89 1.55 1.22 1.18 R5 / f 2.07 2.29 1.28 1.63 1.34 1.85 1.76 R7 / f 1.86 1.77 2.44 4.02 1.59 2.01 1.79 R8 / f 0.73 0.67 1.29 1.31 1.29 0.79 0.80 R10 / f -18.64 -19.59 -1.36 -1.14 -0.99 -1.60 -1.50 R14 / f -2.15 -1.89 -3.42 -2.97 -1.33 -2.30 -2.30 R15 / f -1.98 -1.67 -2.68 -6.82 -2.74 -3.32 -2.93 R16 / f -35.17 -33.13 -14.73 -78.68 -1045.39 -40.12 -79.86 d1 / d16 1.77 1.57 1.88 2.32 2.09 1.65 1.80 (R7-R8) / (R7+R8) 0.44 0.45 0.31 0.51 0.10 0.43 0.38 (R15-R16) / (R15+R16) -0.89 -0.90 -0.69 -0.84 -0.99 -0.85 -0.93

[0220] In summary, the optical lens provided by the present application adopts eight lenses with specific optical powers, and 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 large field angle, large aperture, high imaging quality, etc.

[0221] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0222] The above-described embodiments only express several embodiments of the present application, which are described in detail and specifically, but should not be understood as limiting the scope of the present patent. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the scope of protection of the present patent should be subject to the appended 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 convex and whose image side is concave; A second lens with a negative optical power; A third lens with a positive optical power, whose object side is convex; A fourth lens with a negative optical power, whose object side is convex and whose image side is concave; A fifth lens with a positive optical power, whose image side is convex; A sixth lens with a negative optical power; A seventh lens with a positive optical power, whose image side is convex; An eighth lens with a negative optical power, whose object side is concave and whose image side is convex; Wherein, 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 < (R7 - R8) / (R7 + R8) < 0.6, and the curvature radius R15 of the object side of the eighth lens and the curvature radius R16 of the image side of the eighth lens satisfy: -1 < (R15 + R16) / (R15 - R16) < -0.

6.

2. The optical lens according to claim 1, characterized in that, The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.2 < TTL / f < 8; the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.5 < TTL / IH < 3.

9.

3. The optical lens according to claim 1, characterized in that, The maximum field angle FOV of the optical lens and the f-number FNO of the optical lens satisfy: 39° < FOV / FNO < 85°; the true image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 2.7 < IH / EPD < 5.

7.

4. The optical lens according to claim 1, characterized in that, The true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.3 < IH / f < 2.8; the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.6 < BFL / f < 1.

6.

5. 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: -2.5 < f1 / f < -1.1, the effective focal length f of the optical lens and the curvature radius R1 of the object side of the first lens satisfy: 2.4 < R1 / f < 11.5, and the effective focal length f of the optical lens and the curvature radius R2 of the image side of the first lens satisfy: 0.6 < R2 / f < 1.

7.

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: -z < f4 / f < -1.9; the effective focal length f of the optical lens and the curvature radius R7 of the object side of the fourth lens satisfy: 1.4 < R7 / f < 4.4; the effective focal length f of the optical lens and the curvature radius R8 of the image side of the fourth lens satisfy: 0.6 < R8 / f < 1.

4.

7. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 1 < f5 / f < 1.8; the effective focal length f of the optical lens and the curvature radius R10 of the image side of the fifth lens satisfy: -21 < R10 / f < -0.

9. It should be noted that there is a typo in the original text where 'z' appears in . It should probably be a specific value. If this is an important part, please check and correct it in the original text for a more accurate translation.

8. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 0.7 < f7 / f < 2.3; the effective focal length f of the optical lens and the image-side curvature radius R14 of the seventh lens satisfy: -3.7 < R14 / f < -1.

2.

9. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f8 of the eighth lens satisfy: -12.5 < f8 / f < -2.5; the object-side curvature radius R15 of the eighth lens and the effective focal length f of the optical lens satisfy: -7.5 < R15 / f < -1.5; the image-side curvature radius R16 of the eighth lens and the effective focal length f of the optical lens satisfy: -1100 < R16 / f < -14.

10. The optical lens according to claim 1, characterized in that, The combined focal length f45678 of 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: 1.3 < f45678 / f < 6.3; the object-side clear aperture radius d1 of the first lens and the image-side clear aperture radius d16 of the eighth lens satisfy: 1.4 < d1 / d16 < 2.5.

Images