Optical lens

Abstract

The invention provides an optical lens, which comprises eight lenses from an object side to an imaging surface along an optical axis: 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, the object side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface; the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; the seventh lens has positive focal power, and the object side surface of the seventh lens is a convex surface; 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 lens has one or more advantages of an ultra-wide angle, a large image plane, a large aperture, high imaging quality and the like.

Description

Technical Field

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

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

[0003] Advanced Driver Assistance Systems (ADAS) play a crucial role in intelligent driving. They use various lenses and sensors to collect environmental information to ensure driver safety. Existing ADAS systems require not only a thin, compact form factor with high pixel count and resolution, but also the ability to produce clear images in low-light conditions. Therefore, developing an optical lens with excellent imaging performance is crucial. Summary of the Invention

[0004] In view of the above problems, an object of the present invention is to provide an optical lens having the advantage of excellent imaging quality.

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

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

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

[0008] a second lens having negative optical power and a concave object-side surface;

[0009] a third lens element having positive optical power and a convex object-side surface;

[0010] a fourth lens element having positive optical power and a convex object-side surface;

[0011] a fifth lens element having positive refractive power, whose object-side surface is convex and whose image-side surface is concave;

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

[0013] a seventh lens element having positive optical power and a convex object-side surface;

[0014] an eighth lens element having positive refractive power, whose object-side surface is concave and whose image-side surface is convex;

[0015] The object side curvature radius R9 of the fifth lens and the image side curvature radius R10 of the fifth lens satisfy the following relationship: -0.8<(R9-R10) / (R9+R10)<-0.4; the object side curvature radius R15 of the eighth lens and the image side curvature radius R16 of the eighth lens satisfy the following relationship: 0<(R15-R16) / (R15+R16)<0.7.

[0016] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.1 <TTL / f<8.5;所述光学镜头的光学总长TTL与所述光学镜头的最大视场角所对应的真实像高IH满足:2.8<TTL / IH<3.5。

[0017] Further preferably, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens meet the following requirements: 80° <FOV / Fno<100°;所述光学镜头的最大视场角所对应的真实像高IH与所述光学镜头的入瞳直径EPD满足:3.1<IH / EPD<4.5。

[0018] Further preferably, the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy the following relationship: 1.9 <IH / f<2.7;所述光学镜头的有效焦距f与所述光学镜头的后焦距BFL满足:0.63<BFL / f<1.01。

[0019] Further preferably, the object side aperture d1 of the first lens, the real image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens meet the following conditions: 0.33 <d1 / (IH / 2) / tan(FOV / 2)<0.62;所述第四透镜、所述第五透镜、所述第六透镜、所述第七透镜和所述第八透镜的组合焦距f45678与所述光学镜头的有效焦距f满足:1.3<f45678 / f<2.4。

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.7 <f4 / f<3.6;所述第四透镜的物侧面曲率半径R7与所述光学镜头的有效焦距f满足:1.2<R7 / f<2。

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2.3 <f5 / f<6.8;所述第五透镜的物侧面曲率半径R9与所述光学镜头的有效焦距f满足:1<R9 / f<2.3;所述第五透镜的像侧面曲率半径R10与所述光学镜头的有效焦距f满足:5.5<R10 / f<8。

[0022] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: <f6 / f<-0.9;所述第六透镜的物侧面曲率半径R11与所述光学镜头的有效焦距f满足:5.5<R11 / f<8;所述第六透镜的像侧面曲率半径R12与所述光学镜头的有效焦距f满足:0.6<R12 / f<1.2。

[0023] Further preferably, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1.1 <f7 / f<1.9;所述第七透镜的物侧面曲率半径R13与所述光学镜头的有效焦距f满足:0.6<R13 / f<1.2。

[0024] Further preferably, the effective focal length f of the optical lens and the focal length f8 of the eighth lens satisfy: 12 <f8 / f<39;所述第八透镜的物侧面曲率半径R15与所述光学镜头的有效焦距f满足:-40<R15 / f<-4.5;所述第八透镜的像侧面曲率半径R16与所述光学镜头的有效焦距f满足:-16.5<R16 / f<-4。

[0025] The optical lens provided by the present invention uses eight lenses with specific optical powers. Through the combination of specific surface shapes and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, so that the lens has one or more advantages such as ultra-wide angle, large image surface, large aperture, 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 readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

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

[0028] Figure 2 This is the MTF curve of the optical lens in Example 1 of the present invention.

[0029] Figure 3 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0030] Figure 4 The MTF curve diagram of the optical lens in Embodiment 2 of the present application.

[0031] Figure 5 The structural schematic diagram of the optical lens in Embodiment 3 of the present application.

[0032] Figure 6 The MTF curve diagram of the optical lens in Embodiment 3 of the present application.

[0033] Figure 7 The structural schematic diagram of the optical lens in Embodiment 4 of the present application.

[0034] Figure 8 The MTF curve diagram of the optical lens in Embodiment 4 of the present application.

[0035] Figure 9 The structural schematic diagram of the optical lens in Embodiment 5 of the present application.

[0036] Figure 10 The MTF curve diagram of the optical lens in Embodiment 5 of the present application.

[0037] Figure 11 The structural schematic diagram of the optical lens in Embodiment 6 of the present application.

[0038] Figure 12 The MTF curve diagram of the optical lens in Embodiment 6 of the present application.

[0039] Figure 13 The structural schematic diagram of the optical lens in Embodiment 7 of the present application.

[0040] Figure 14 The MTF curve diagram of the optical lens in Embodiment 7 of the present application.

[0041] Figure 15 The structural schematic diagram of the optical lens in Embodiment 8 of the present application.

[0042] Figure 16 The MTF curve diagram of the optical lens in Embodiment 8 of the present application.

[0043] Figure 17 The structural schematic diagram of the optical lens in Embodiment 9 of the present application.

[0044] Figure 18 The MTF curve diagram of the optical lens in Embodiment 9 of the present application.

[0045] Figure 19 The structural schematic diagram of the optical lens in Embodiment 10 of the present application.

[0046] Figure 20 The MTF curve diagram of the optical lens in Embodiment 10 of the present application.

[0047] Figure 21 Schematic diagram of the structure of the optical lens in Example 11 of the present invention.

[0048] Figure 22 This is the MTF curve of the optical lens in Example 11 of the present invention.

[0049] Figure 23 Schematic diagram of the structure of the optical lens in Example 12 of the present invention.

[0050] Figure 24 This is the MTF curve of the optical lens in Example 12 of the present invention.

[0051] Figure 25 Schematic diagram of the structure of the optical lens in Example 13 of the present invention.

[0052] Figure 26 This is an MTF curve diagram of the optical lens in Example 13 of the present invention.

[0053] Figure 27 Schematic diagram of the structure of the optical lens in Example 14 of the present invention.

[0054] Figure 28 This is an MTF curve diagram of the optical lens in Example 14 of the present invention.

[0055] Figure 29 Schematic diagram of the structure of the optical lens in Example 15 of the present invention.

[0056] Figure 30 This is an MTF curve diagram of the optical lens in Example 15 of the present invention.

[0057] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0058] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0059] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of the present invention.

[0060] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0061] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0062] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0063] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0064] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this 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.

[0065] The optical lens provided by the embodiment of the present invention comprises eight lenses, which are arranged in order from the object side to the imaging surface along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens.

[0066] In some embodiments, the first lens may have negative optical power, its object-side surface is convex, and its image-side surface is concave. The second lens may have negative optical power, its object-side surface is concave, and its image-side surface may be concave or convex. The third lens may have positive optical power, its object-side surface is convex, and its image-side surface may be concave or convex. The fourth lens may have positive optical power, its object-side surface is convex, and its image-side surface may be concave or convex. The fifth lens may have positive optical power, its object-side surface is convex, and its image-side surface is concave. The sixth lens may have negative optical power, its object-side surface is convex, and its image-side surface is concave. The seventh lens may have positive optical power, its object-side surface is convex, and its image-side surface may be concave or convex. The eighth lens may have positive optical power, its object-side surface is concave, and its image-side surface is convex.

[0067] In some embodiments, the optical lens may further include an aperture, which may be located between the third and fourth lens elements. It is understood that the aperture is used to limit the amount of light entering, thereby changing the brightness of the image. When the aperture is located between the third and fourth lens elements, it facilitates correction of aperture aberrations.

[0068] In some embodiments, the optical lens may further include a filter and a protective glass. The filter and protective glass may be positioned sequentially along the optical axis between the eighth lens and the imaging plane. The filter is used to filter out interfering light, preventing it from reaching the imaging plane of the optical lens and affecting normal imaging. The protective glass protects the optical lens, preventing damage to the photosensitive chip that could affect the lens's imaging performance.

[0069] In some embodiments, the fifth lens, the sixth lens, and the seventh lens may be cemented together to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the decentration sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the difficulty of the processing technology of the optical lens and improving the assembly yield of the optical lens.

[0070] In some embodiments, the object-side curvature radius R9 of the fifth lens element and the image-side curvature radius R10 of the fifth lens element satisfy the following range: -0.8 < (R9 - R10) / (R9 + R10) < -0.4. Meeting this range allows the fifth lens element to have a meniscus shape, which improves the light-converging capability of the optical lens while balancing various aberrations produced by the optical lens, thereby enhancing the imaging quality of the optical lens. More specifically, -0.7 < (R9 - R10) / (R9 + R10) < -0.49.

[0071] In some embodiments, the object-side curvature radius R15 of the eighth lens element and the image-side curvature radius R16 of the eighth lens element satisfy the following conditions: 0 < (R15 - R16) / (R15 + R16) < 0.7. Meeting this range helps suppress the angle of incidence of the edge field of view on the imaging surface, effectively transmitting more light beams to the imaging surface, while also balancing the field curvature and spherical aberration of the optical lens, thereby improving the imaging quality of the optical lens. More specifically, 0.05 < (R15 - R16) / (R15 + R16) < 0.58.

[0072] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.1 <TTL / f<8.5。满足上述范围,可以有效地限制镜头的长度,有利于实现光学镜头的小型化。更为具体的是,6.71<TTL / f<7.79。

[0073] In some embodiments, 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 the following conditions: 2.8 <TTL / IH<3.5。满足上述范围,确保镜头同等总长的情况下,具有较大的像面,能够匹配较大尺寸的成像芯片实现高清成像,较好实现镜头的小总长和大像面的均衡。更为具体的是,3.08<TTL / IH<3.32。

[0074] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens meet the following conditions: 80° <FOV / Fno<100°。满足上述范围,限定光学镜头具有合适的视场角与光圈值,能够收集大角度的光线并且获得良好的成像质量。更为具体的是,84.14°<FOV / Fno<94.08°。

[0075] In some embodiments, 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: 3.1 <IH / EPD<4.5。满足上述范围,可以增大射入光学镜头的光线束的宽度,使得光学镜头在像面处亮度得到提升避免暗角产生。更为具体的是,3.42<IH / EPD<4.2。

[0076] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy the following conditions: 1.9 <IH / f<2.7。满足上述范围,控制光学镜头的像高与焦距在合理的范围内,有助于光学镜头拥有大像面的特性,提升成像品质。更为具体的是,2.12<IH / f<2.47。

[0077] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.63 <BFL / f<1.01。满足上述范围,限定光学镜头具有合适的后焦,便于对各透镜的位置进行合理排布,同时降低加工装配难度。

[0078] In some embodiments, the object side aperture d1 of the first lens, the real image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy the following conditions: 0.33 <d1 / (IH / 2) / tan(FOV / 2)<0.62。满足上述范围,可以在满足光学镜头具有大视场角与大像面的同时前端口径小。

[0079] 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 satisfies the following with the effective focal length f of the optical lens: 1.3 <f45678 / f<2.4。满足上述范围,通过合理设置光阑后的透镜组关系,有利于平衡光阑前的透镜组产生的各类像差,提升整体成像品质。更为具体的是,1.39<f45678 / f<2.2。

[0080] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.7 <f4 / f<3.6;第四透镜的物侧面曲率半径R7与光学镜头的有效焦距f满足:1.2<R7 / f<2。满足上述范围,第四透镜采用正光焦度以及物侧面为凸面,可以进一步聚焦光线,能调整主光线角度,优化成像质量,并校正剩余像差(如畸变、色差等),减小广角镜头的畸变。更为具体的是,1.81<f4 / f<3.37;1.36<R7 / f<1.9。

[0081] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2.3 <f5 / f<6.8;第五透镜的物侧面曲率半径R9与光学镜头的有效焦距f满足:1<R9 / f<2.3;第五透镜的像侧面曲率半径R10与光学镜头的有效焦距f满足:5.5<R10 / f<8。满足上述范围,有利于光线的收敛,分担第三透镜、第四透镜的正光焦度,可以避免光线偏折过大,更好实现镜头的高品质成像。更为具体的是,2.52<f5 / f<6.19;1.06<R9 / f<2.16;5.79<R10 / f<7.25。

[0082] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: <f6 / f<-0.9;第六透镜的物侧面曲率半径R11与光学镜头的有效焦距f满足:5.5<R11 / f<8;第六透镜的像侧面曲率半径R12与光学镜头的有效焦距f满足:0.6<R12 / f<1.2。满足上述范围,使边缘视场的光线呈上升趋势,有利于成像面上的像点远离光轴,以有利于实现与大芯片匹配的效果,获得更大的画面,可以有效消除像差,提高光学镜头的解像能力。更为具体的是,-1.83<f6 / f<-0.96;5.79<R11 / f<7.25;0.67<R12 / f<1.1。

[0083] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1.1 <f7 / f<1.9;第七透镜的物侧面曲率半径R13与光学镜头的有效焦距f满足:0.6<R13 / f<1.2。满足上述范围,有利于光线汇聚,使光线走势平稳过渡到后方,降低入射到后方的光线的高度,减缓光线的上扬趋势,避免大视场光线到达成像面时与芯片主光线角过大造成的光能损失,利于提高边缘视场的照度,并有利于实现短的光学总长。更为具体的是,1.21<f7 / f<1.78;0.67<R13 / f<1.1。

[0084] In some embodiments, the effective focal length f of the optical lens and the focal length f8 of the eighth lens satisfy: 12 <f8 / f<39;第八透镜的物侧面曲率半径R15与光学镜头的有效焦距f满足:-40<R15 / f<-4.5;第八透镜的像侧面曲率半径R16与光学镜头的有效焦距f满足:-16.5<R16 / f<-4。满足上述范围,设置第八透镜具有正屈折力以及具有合适的面型,有利于光线汇聚,使光线走势平稳过渡到后方,降低入射到后方的光线的高度,减缓光线的上扬趋势,避免大视场光线到达成像面时与芯片主光线角过大造成的光能损失,利于提高边缘视场的照度,并有利于实现短的光学总长。更为具体的是,12.97<f8 / f<35.78;-38.89<R15 / f<-4.97;-15.05<R16 / f<-4.39。

[0085] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.4 < f1 / f < -1.5; the object-side surface curvature radius R1 of the first lens and the effective focal length f of the optical lens satisfy: 5.5 < R1 / f < 16.5; and the image-side surface curvature radius R2 of the first lens and the effective focal length f of the optical lens satisfy: 1.1 < R2 / f < 1.4. By satisfying the above ranges, by setting the first lens to have a negative refractive power and a suitable surface shape, the first lens can be facilitated to receive light rays of a larger angle and collect as many light rays as possible into the rear optical system, thereby achieving a large field of view while increasing the light flux. More specifically, -2.23 < f1 / f < -1.65; 6.03 < R1 / f < 15.05; and 1.14 < R2 / f < 1.32.

[0086] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -22.5 < f2 / f < -1.9. By satisfying the above range, the second lens is made to have a negative refractive power and has a function of diverging light rays, further diverges the light rays exiting the image-side surface of the first lens at the same field of view, can disperse the central light rays and the edge light rays of each field of view, can make the rear optical system have a larger light receiving surface to receive the light rays exiting the image-side surface of the second lens, thereby achieving a larger light amount and being beneficial to increasing the relative illumination. More specifically, -20.62 < f2 / f < -2.13.

[0087] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 2.6 < f3 / f < 90; and the object-side surface curvature radius R5 of the third lens and the effective focal length f of the optical lens satisfy: 2 < R5 / f < 13.5. By satisfying the above ranges, the third lens is limited to have a suitable positive refractive power and a convex object-side surface, has a function of converging light rays and lowers the height of the peripheral light rays, and is beneficial to reducing the aperture of the rear lens. More specifically, 2.86 < f3 / f < 80.95; and 2.22 < R5 / f < 12.45.

[0088] In some embodiments, the optical lens satisfies the following conditions: 5mm <f<7mm;3mm<EPD<4mm;40mm<TTL<50mm;1.5<Fno<1.8;18°<CRA<23°;3.5mm<BFL<6.5mm;130°<FOV<160°;13mm<IH<14mm。上述条件式中,f表示光学镜头的有效焦距,EPD表示光学镜头的入瞳直径,TTL表示光学镜头的光学总长,Fno表示光学镜头的光圈值,CRA表示光学镜头的主光线入射角,BFL表示光学镜头的后焦距,FOV表示光学镜头的最大视场角,IH表示光学镜头的最大视场角所对应的真实像高。满足上述范围,光学镜头至少具有超广角、大靶面、大光圈等一个或多个优点。更为具体的是,5.52mm<f<6.41mm;3.25mm<EPD<3.98mm;42.15mm<TTL<45.12mm;1.57<Fno<1.71;18.25°<CRA<22.55°;3.98mm<BFL<6.11mm;137.9°<FOV<152.5°;13.61mm<IH<13.65mm。

[0089] In some embodiments, the lens material of the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, production costs can be effectively reduced. Alternatively, when the lens material is glass, the inherent low dispersion of glass can effectively correct the geometric chromatic aberration of the optical system. The optical lens provided by the present invention can utilize an all-glass lens structure, which can reduce dispersion, effectively correct chromatic aberration of the optical lens, and improve imaging quality.

[0090] In some embodiments, the first, second, third, fourth, fifth, sixth, seventh, and eighth lenses may be spherical or aspherical lenses. Compared to spherical lenses, aspherical structures can effectively reduce aberrations in the optical system, thereby reducing the number and size of lenses and achieving better miniaturization. More specifically, the fourth and eighth lenses of the present invention are aspherical lenses, while the first, second, third, fifth, sixth, and seventh lenses are spherical lenses.

[0091] In various embodiments of the present invention, when the lens is an aspheric lens, the shapes of the aspheric surfaces of the optical lens satisfy the following equations:

[0092]

[0093] Wherein, z is the distance of the curved surface and the curved surface vertex 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 curved surface vertex, K is the quadratic curved surface coefficient, B, C, D, E, F are the fourth order, sixth order, eighth order, tenth order, twelfth order curved surface coefficients respectively.

[0094] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, 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 only the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, any change, replacement, combination or simplification made without departing from the innovative points of the application should be regarded as equivalent replacement mode, and all are included in the protection scope of the application.

[0095] Embodiment 1

[0096] 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 100 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 diaphragm ST, 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.

[0097] The first lens L1 has negative focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface;

[0098] The second lens L2 has negative focal power, the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface;

[0099] The third lens L3 has positive focal power, the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface;

[0100] The fourth lens L4 has positive focal power, the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface;

[0101] The fifth lens L5 has positive focal power, the object side surface S9 is a convex surface, and the image side surface is a concave surface;

[0102] The sixth lens L6 has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;

[0103] The seventh lens L7 has positive focal power, the object side surface is a convex surface, and the image side surface S12 is a convex surface;

[0104] The fifth lens L5, the sixth lens L6, and the seventh lens L7 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 L7 is S10, and the cemented surface between the image-side surface of the sixth lens L6 and the object-side surface of the seventh lens L7 is S11.

[0105] The eighth lens L8 has positive refractive power, its object-side surface S13 is concave, and its image-side surface S14 is convex;

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

[0107] The object side surface S17 and the image side surface S18 of the protective glass G2 are both flat surfaces;

[0108] The imaging surface S19 is a plane.

[0109] The fourth lens L4 and the eighth lens L8 are glass aspherical lenses; the first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are glass spherical lenses.

[0110] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0111] Table 1-1

[0112]

[0113] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0114] Table 1-2

[0115] Face number K B C D E F S7 -1.20E+01 1.42E-03 -5.14E-05 2.07E-06 -4.96E-08 6.05E-10 S8 4.02E+01 1.14E-04 6.31E-07 1.52E-08 -3.81E-12 1.59E-11 S13 2.00E+02 -9.67E-04 -1.64E-05 1.36E-07 -3.23E-08 1.25E-10 S14 5.32E+01 -5.73E-04 -3.80E-06 1.82E-07 -4.71E-09 6.10E-11

[0116] Figure 2 The MTF (Modulation Transfer Function) curve for Example 1 is shown, representing the degree of lens imaging modulation at different spatial frequencies across the field of view. The horizontal axis represents spatial frequency (lp / mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value of this embodiment is consistently above 0.3 across the entire field of view. Within the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating excellent imaging quality and detail resolution at both low and high frequencies.

[0117] Example 2

[0118] See also Figure 3, shown is a schematic structural diagram of the optical lens 200 provided in Example 2 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the image-side surface S14 of the seventh lens L7 is concave; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0119] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0120] Table 2-1

[0121]

[0122] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0123] Table 2-2

[0124] Face number K B C D E F S7 -7.89E+00 1.44E-03 -4.94E-05 1.81E-06 -4.19E-08 4.64E-10 S8 -1.36E+02 1.42E-04 4.10E-07 -2.95E-08 9.42E-10 2.90E-11 S13 5.70E+01 -1.10E-03 -2.20E-05 4.59E-07 -7.54E-08 1.32E-09 S14 5.71E+01 -6.14E-04 -6.48E-06 2.53E-07 -5.56E-09 6.50E-11

[0125] from Figure 4 It can be seen that the MTF value of this embodiment is above 0.3 in the entire field of view, and has good imaging quality and good detail resolution capability in both low-frequency and high-frequency conditions.

[0126] Example 3

[0127] See also Figure 5 , shown is a schematic structural diagram of an optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the image-side surface S6 of the third lens L3 is convex; the image-side surface S14 of the seventh lens L7 is concave; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0128] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0129] Table 3-1

[0130]

[0131] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0132] Table 3-2

[0133] Face number K B C D E F S7 -7.28E+00 1.35E-03 -3.66E-05 1.20E-06 -2.35E-08 2.62E-10 S8 5.61E+01 1.51E-04 4.75E-07 1.46E-07 -5.09E-09 1.74E-10 S13 1.41E+02 -1.23E-03 -1.25E-05 -6.37E-07 1.24E-08 -6.43E-10 S14 4.60E+01 -8.37E-04 -5.03E-06 2.03E-07 -4.96E-09 5.16E-11

[0134] from Figure 6 It can be seen that the MTF value of this embodiment is above 0.3 in the entire field of view, and has good imaging quality and good detail resolution capability in both low-frequency and high-frequency conditions.

[0135] Example 4

[0136] See also Figure 7 , shown is a schematic structural diagram of an optical lens 400 provided in Example 4 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image-side surface S6 of the third lens L3 is a convex surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0137] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0138] Table 4-1

[0139]

[0140] The surface parameters of the aspheric lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0141] Table 4-2

[0142] Face number K B C D E F S7 -7.79E+00 1.30E-03 -3.44E-05 1.31E-06 -3.00E-08 4.37E-10 S8 1.37E+02 1.51E-04 4.98E-07 2.78E-07 -1.17E-08 3.34E-10 S13 2.00E+02 -9.96E-04 -1.05E-05 -2.67E-07 6.04E-09 -3.81E-10 S14 9.76E+01 -7.80E-04 -3.36E-06 8.98E-08 -1.47E-09 -3.41E-12

[0143] from Figure 8 It can be seen that the MTF value of this embodiment is above 0.4 in the entire field of view, and has good imaging quality and good detail resolution capability in both low-frequency and high-frequency conditions.

[0144] Example 5

[0145] See also Figure 9 , shown is a schematic structural diagram of an optical lens 500 provided in Example 5 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the image-side surface S8 of the fourth lens L4 is convex; the image-side surface S14 of the seventh lens L7 is concave; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0146] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0147] Table 5-1

[0148]

[0149] The surface parameters of the aspheric lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0150] Table 5-2

[0151] Face number K B C D E F S7 -1.96E+00 2.94E-04 2.05E-06 -3.18E-07 1.48E-08 -3.19E-10 S8 4.17E+01 8.04E-05 1.79E-06 -3.59E-07 1.58E-08 -3.53E-10 S13 2.00E+02 -1.22E-03 -2.01E-05 8.94E-08 -4.90E-08 9.24E-10 S14 5.34E+01 -6.61E-04 -4.38E-06 2.74E-07 -7.06E-09 1.10E-10

[0152] from Figure 10It can be seen that the MTF value of this embodiment is above 0.2 in the entire field of view, and has good imaging quality and good detail resolution capability in both low-frequency and high-frequency conditions.

[0153] Example 6

[0154] See also Figure 11 , shown is a schematic structural diagram of an optical lens 600 provided in Example 6 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image side surface S4 of the second lens L2 is concave; the image side surface S6 of the third lens L3 is convex; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0155] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6-1.

[0156] Table 6-1

[0157]

[0158] The surface parameters of the aspheric lens of the optical lens 600 in Example 6 are shown in Table 6-2.

[0159] Table 6-2

[0160] Face number K B C D E F S7 -7.69E+00 1.54E-03 -4.66E-05 1.72E-06 -3.67E-08 4.31E-10 S8 1.38E+02 2.30E-04 2.22E-06 1.94E-07 -8.21E-09 2.87E-10 S13 2.00E+02 -1.15E-03 -1.44E-05 -7.43E-08 -1.78E-08 1.30E-10 S14 2.13E+01 -8.34E-04 -2.54E-06 8.78E-08 -2.15E-09 2.52E-11

[0161] from Figure 12 It can be seen that the MTF value of this embodiment is above 0.2 in the entire field of view, and has good imaging quality and good detail resolution capability in both low-frequency and high-frequency conditions.

[0162] Example 7

[0163] See also Figure 13 , shown is a schematic structural diagram of an optical lens 700 provided in Example 7 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the image-side surface S4 of the second lens L2 is a concave surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0164] The relevant parameters of each lens in the optical lens 700 in Example 7 are shown in Table 7-1.

[0165] Table 7-1

[0166]

[0167] The surface parameters of the aspheric lens of the optical lens 700 in Example 7 are shown in Table 7-2.

[0168] Table 7-2

[0169] Face number K B C D E F S7 -1.35E+01 1.25E-03 -3.37E-05 1.35E-06 -2.84E-08 3.42E-10 S8 9.17E+01 3.73E-04 4.62E-06 1.15E-07 -2.47E-09 1.33E-10 S13 9.58E+00 -1.29E-03 -1.14E-05 -8.80E-07 2.43E-08 -1.23E-09 S14 1.70E+01 -7.50E-04 -1.55E-06 1.54E-07 -5.61E-09 7.55E-11

[0170] from Figure 14 It can be seen that the MTF value of this embodiment is above 0.25 in the entire field of view, and has good imaging quality and good detail resolution capability in both low-frequency and high-frequency conditions.

[0171] Example 8

[0172] See also Figure 15 , shown is a schematic structural diagram of an optical lens 800 provided in Example 8 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image-side surface S4 of the second lens element L2 is concave; the image-side surface S6 of the third lens element L3 is convex; the image-side surface S8 of the fourth lens element L4 is convex; and the image-side surface S14 of the seventh lens element L7 is concave; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0173] The relevant parameters of each lens in the optical lens 800 in Example 8 are shown in Table 8-1.

[0174] Table 8-1

[0175]

[0176] The surface parameters of the aspheric lens of the optical lens 800 in Example 8 are shown in Table 8-2.

[0177] Table 8-2

[0178] Face number K B C D E F S7 -5.45E+00 9.81E-04 -2.24E-05 5.30E-07 -8.23E-09 6.11E-11 S8 1.09E+01 8.21E-05 1.05E-06 -3.65E-08 1.03E-09 -6.96E-12 S13 2.00E+02 -9.28E-04 -1.75E-05 4.41E-07 -4.10E-08 6.69E-10 S14 1.04E+02 -5.83E-04 -2.48E-06 5.12E-08 -2.58E-10 -4.62E-12

[0179] from Figure 16 It can be seen that the MTF value of this embodiment is above 0.4 in the entire field of view, and has good imaging quality and good detail resolution capability in both low-frequency and high-frequency conditions.

[0180] Example 9

[0181] See also Figure 17 , shown is a schematic structural diagram of an optical lens 900 provided in Example 9 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the image-side surface S4 of the second lens element L2 is a concave surface; the image-side surface S14 of the seventh lens element L7 is a concave surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0182] The relevant parameters of each lens in the optical lens 900 in Example 9 are shown in Table 9-1.

[0183] Table 9-1

[0184]

[0185] The surface parameters of the aspheric lens of the optical lens 900 in Example 9 are shown in Table 9-2.

[0186] Table 9-2

[0187] Face number K B C D E F S7 -1.40E+01 1.23E-03 -4.04E-05 1.64E-06 -3.87E-08 4.87E-10 S8 5.68E+01 2.64E-04 3.28E-06 1.37E-07 -5.69E-09 2.36E-10 S13 1.78E+01 -1.25E-03 -1.61E-05 -8.02E-07 1.17E-09 -1.08E-09 S14 1.39E+02 -7.40E-04 -4.16E-06 1.16E-07 -3.00E-09 4.18E-11

[0188] from Figure 18 It can be seen that the MTF value of this embodiment is above 0.2 in the entire field of view, and has good imaging quality and good detail resolution capability in both low-frequency and high-frequency conditions.

[0189] Example 10

[0190] See also Figure 19 , shown is a schematic structural diagram of the optical lens 1000 provided in Example 10 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image-side surface S4 of the second lens L2 is concave; the image-side surface S8 of the fourth lens L4 is convex; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0191] The relevant parameters of each lens in the optical lens 1000 in Example 10 are shown in Table 10-1.

[0192] Table 10-1

[0193]

[0194] The surface parameters of the aspheric lens of the optical lens 1000 in Example 10 are shown in Table 10-2.

[0195] Table 10-2

[0196] Face number K B C D E F S7 -1.54E+01 1.67E-03 -9.47E-05 4.80E-06 -1.50E-07 2.31E-09 S8 5.23E+00 1.89E-04 3.18E-07 4.01E-07 -2.51E-08 8.39E-10 S13 2.00E+02 -1.38E-03 -2.41E-05 2.90E-07 -5.30E-08 1.01E-09 S14 1.52E+02 -8.72E-04 -5.15E-06 2.84E-07 -6.75E-09 1.16E-10

[0197] from Figure 20 It can be seen that the MTF value of this embodiment is above 0.2 in the entire field of view, and has good imaging quality and good detail resolution capability in both low-frequency and high-frequency conditions.

[0198] Example 11

[0199] See also Figure 21 , shown is a schematic structural diagram of an optical lens 1100 provided in Example 11 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image-side surface S6 of the third lens L3 is convex; the image-side surface S8 of the fourth lens L4 is convex; the image-side surface S14 of the seventh lens L7 is concave; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0200] The relevant parameters of each lens in the optical lens 1100 in Example 11 are shown in Table 11-1.

[0201] Table 11-1

[0202]

[0203] The surface shape parameters of the aspherical lenses of the optical lens 1100 in Embodiment 11 are shown in Table 11-2.

[0204] Table 11-2

[0205] Face number K B C D E F S7 -4.94E+00 7.54E-04 -1.25E-05 2.51E-07 -3.28E-09 1.99E-11 S8 1.66E+00 7.81E-05 -3.58E-07 0.00E+00 0.00E+00 0.00E+00 S13 2.00E+02 -1.12E-03 -3.77E-05 2.74E-06 -2.22E-07 5.31E-09 S14 8.58E+01 -7.25E-04 -7.65E-06 3.47E-07 -9.32E-09 1.10E-10

[0206] As can be seen from Figure 22 , the MTF values of the present embodiment are all above 0.2 within the full field of view, and have good imaging quality and good detail resolution ability in both low frequency and high frequency cases.

[0207] Embodiment 12

[0208] Please refer to Figure 23 , which is a structural schematic diagram of the optical lens 1200 provided in Embodiment 12 of the present application. Compared with Embodiment 1, the main difference is that the image side surface S4 of the second lens L2 is a concave surface; the image side surface S6 of the third lens L3 is a convex surface; the image side surface S14 of the seventh lens L7 is a concave surface; and the optical parameters such as the radii of curvature and the lens thicknesses of the surfaces of the lenses are different.

[0209] The related parameters of the lenses in the optical lens 1200 in Embodiment 12 are shown in Table 12-1.

[0210] Table 12-1

[0211]

[0212] The surface shape parameters of the aspherical lenses of the optical lens 1200 in Embodiment 12 are shown in Table 12-2.

[0213] Table 12-2

[0214] Face number K B C D E F S7 -7.83E+00 1.59E-03 -5.00E-05 1.70E-06 -3.37E-08 3.37E-10 S8 7.90E+01 2.12E-04 3.50E-07 1.92E-07 -5.99E-09 1.91E-10 S13 -1.97E+02 -1.31E-03 -1.61E-05 -3.02E-07 -1.94E-08 2.97E-10 S14 -1.26E+02 -8.69E-04 -3.58E-06 1.62E-07 -3.61E-09 6.21E-11

[0215] As can be seen from Figure 24 , the MTF values of the present embodiment are all above 0.2 within the full field of view, and have good imaging quality and good detail resolution ability in both low frequency and high frequency cases.

[0216] Embodiment 13

[0217] Please refer to Figure 25, shown is a schematic structural diagram of an optical lens 1300 provided in Example 13 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the image side surface S4 of the second lens L2 is concave; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0218] The relevant parameters of each lens in the optical lens 1300 in Example 13 are shown in Table 13-1.

[0219] Table 13-1

[0220]

[0221] The surface parameters of the aspheric lens of the optical lens 1300 in Example 13 are shown in Table 13-2.

[0222] Table 13-2

[0223] Face number K B C D E F S7 -1.00E+00 5.69E-05 6.90E-07 2.32E-08 -1.31E-09 5.71E-11 S8 -4.21E+01 7.13E-05 -4.13E-07 1.28E-07 -5.89E-09 1.42E-10 S13 1.13E+02 -1.17E-03 -1.57E-05 -2.16E-07 -5.20E-09 -3.16E-10 S14 -1.04E+01 -8.43E-04 -6.78E-06 2.69E-07 -6.88E-09 7.08E-11

[0224] from Figure 26 It can be seen that the MTF value of this embodiment is above 0.2 in the entire field of view, and has good imaging quality and good detail resolution capability in both low-frequency and high-frequency conditions.

[0225] Example 14

[0226] See also Figure 27 , shown is a schematic structural diagram of an optical lens 1400 provided in Example 14 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image side surface S4 of the second lens L2 is concave; the image side surface S6 of the third lens L3 is convex; the image side surface S8 of the fourth lens L4 is convex; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0227] The relevant parameters of each lens in the optical lens 1400 in Example 14 are shown in Table 14-1.

[0228] Table 14-1

[0229]

[0230] The surface parameters of the aspheric lens of the optical lens 1400 in Example 14 are shown in Table 14-2.

[0231] Table 14-2

[0232] Face number K B C D E F S7 -1.15E+01 1.27E-03 -4.91E-05 1.91E-06 -4.59E-08 5.54E-10 S8 1.28E+01 1.87E-04 -5.22E-08 2.30E-07 -1.02E-08 2.54E-10 S13 -1.07E+01 -1.04E-03 -1.43E-05 -2.29E-08 -1.14E-08 4.44E-11 S14 1.17E+02 -7.08E-04 -3.88E-06 1.95E-07 -3.99E-09 3.88E-11

[0233] from Figure 28It can be seen that the MTF value of this embodiment is above 0.38 in the entire field of view, and has good imaging quality and good detail resolution capability in both low-frequency and high-frequency conditions.

[0234] Example 15

[0235] See also Figure 29 , shown is a schematic structural diagram of an optical lens 1500 provided in Example 15 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image-side surface S4 of the second lens L2 is concave; the image-side surface S8 of the fourth lens L4 is convex; the image-side surface S14 of the seventh lens L7 is concave; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0236] The relevant parameters of each lens in the optical lens 1500 in Example 15 are shown in Table 15-1.

[0237] Table 15-1

[0238]

[0239] The surface parameters of the aspheric lens of the optical lens 1500 in Example 15 are shown in Table 15-2.

[0240] Table 15-2

[0241] Face number K B C D E F S7 -1.21E+01 1.82E-03 -1.00E-04 4.63E-06 -1.32E-07 1.59E-09 S8 8.37E+00 1.37E-04 3.26E-06 -2.72E-07 1.28E-08 -2.73E-10 S13 2.00E+02 -1.50E-03 -2.20E-05 -4.50E-07 -5.32E-08 8.96E-10 S14 3.76E+01 -8.85E-04 -3.48E-06 1.22E-07 -2.04E-09 5.76E-11

[0242] from Figure 30 It can be seen that the MTF value of this embodiment is above 0.25 in the entire field of view, and has good imaging quality and good detail resolution capability in both low-frequency and high-frequency conditions.

[0243] Please refer to Tables 16-1 and 16-2, which show the optical characteristics corresponding to the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, real image height IH corresponding to the maximum field of view angle, maximum field of view angle FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0244] Table 16-1

[0245]

[0246]

[0247] Table 16-2

[0248]

[0249]

[0250] In summary, the optical lens provided by the present invention uses eight lenses with specific optical powers. Through the combination of specific surface shapes 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 ultra-wide angle, large image surface, large aperture, and high imaging quality.

[0251] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0252] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An optical lens, comprising 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, whose object side is concave; A third lens with a positive optical power, whose object side is convex; A fourth lens with a positive optical power, whose object side is convex; A fifth lens with a positive optical power, whose object side is convex and whose image side is concave; A sixth lens with a negative optical power, whose object side is convex and whose image side is concave; A seventh lens with a positive optical power, whose object side is convex; An eighth lens with a positive optical power, whose object side is concave and whose image side is convex; Wherein, the curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: -0.8 < (R9 - R10) / (R9 + R10) < -0.4; 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: 0 < (R15 - R16) / (R15 + R16) < 0.

7.

2. The optical lens according to claim 1, wherein: The overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.1 < TTL / f < 8.5; the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.8 < TTL / IH < 3.

5.

3. The optical lens according to claim 1, wherein: The maximum field angle FOV of the optical lens and the f-number Fno of the optical lens satisfy: 80° < FOV / Fno < 100°; 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: 3.1 < IH / EPD < 4.

5.

4. The optical lens according to claim 1, wherein: 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: 1.9 < IH / f < 2.7; the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.63 < BFL / f < 1.

01.

5. The optical lens according to claim 1, wherein: The clear aperture d1 of the object side of the first lens, the true image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy: 0.33 < d1 / (IH / 2) / tan(FOV / 2) < 0.62; 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 < 2.

4.

6. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.7 < f4 / f < 3.6; the curvature radius R7 of the object side of the fourth lens and the effective focal length f of the optical lens satisfy: 1.2 < R7 / f < 2.

7. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2.3 < f5 / f < 6.8; the object-side curvature radius R9 of the fifth lens and the effective focal length f of the optical lens satisfy: 1 < R9 / f < 2.3; the image-side curvature radius R10 of the fifth lens and the effective focal length f of the optical lens satisfy: 5.5 < R10 / f < 8.

8. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -2 < f6 / f < -0.9; the object-side curvature radius R11 of the sixth lens and the effective focal length f of the optical lens satisfy: 5.5 < R11 / f < 8; the image-side curvature radius R12 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.6 < R12 / f < 1.

2.

9. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1.1 < f7 / f < 1.9; the object-side curvature radius R13 of the seventh lens and the effective focal length f of the optical lens satisfy: 0.6 < R13 / f < 1.

2.

10. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f8 of the eighth lens satisfy: 12 < f8 / f < 39; the object-side curvature radius R15 of the eighth lens and the effective focal length f of the optical lens satisfy: -40 < R15 / f < -4.5; the image-side curvature radius R16 of the eighth lens and the effective focal length f of the optical lens satisfy: -16.5 < R16 / f < -4.

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