Large-aperture optical system and camera module applying same

Abstract

The invention provides a large-aperture optical system and a camera module applying the same, the large-aperture optical system is mainly composed of eight lenses, the object plane side of the first lens is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is negative; the object plane side of the second lens is a convex surface, the image plane side is a concave surface, and the focal power is negative; the third lens has focal power; the fourth lens has focal power; the object plane side of the fifth lens is a convex surface, the image plane side of the fifth lens is a convex surface, and the focal power is positive; the object plane side of the sixth lens is a concave surface, the image plane side of the sixth lens is a concave surface, and the focal power is negative; the object plane side of the seventh lens is a convex surface, the image plane side of the seventh lens is a convex surface, and the focal power is positive; the object plane side of the eighth lens is a convex surface, the image plane side of the eighth lens is a convex surface, and the focal power is positive; the lens is reasonable in number and simple in structure, the imaging quality of an optical system is improved by reasonably distributing the focal power of the lenses and optimizing the aberration of the lens, the characteristics of ultra-wide angle, high illumination, day and night confocal and excellent temperature characteristic are considered, and the lens has huge potential in the IPC market.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging, in particular to a large-aperture optical system and a camera module using the same. BACKGROUND

[0002] With the progress of science and technology and the development of social economy, camera lenses are widely used in various fields, especially in the field of security monitoring. However, the previous camera lenses or optical systems have defects such as low pixel, small field of view, poor day and night effect, and small light quantity, which are difficult to meet the needs of users. SUMMARY

[0003] In order to overcome the technical problems of low pixel, small field of view, poor day and night effect, and small light quantity of the existing optical lenses, the present application provides a large-aperture optical system. By reasonably distributing the surface shape and optical power of each lens, the lens aberration is optimized, and the system has excellent resolving power, high pixel, large aperture, no thermalization, day and night focusing, light weight, and other characteristics, which has greater competitiveness in the IPC market.

[0004] An optical system, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in sequence from an object plane to an image plane along an optical axis: The object plane side of the first lens is convex, and the image plane side is concave, and the optical power thereof is negative; The object plane side of the second lens is convex, and the image plane side is concave, and the optical power thereof is negative; The third lens has optical power; The fourth lens has optical power; The object plane side of the fifth lens is convex, and the image plane side is convex, and the optical power thereof is positive; The object plane side of the sixth lens is concave, and the image plane side is concave, and the optical power thereof is negative; The object plane side of the seventh lens is convex, and the image plane side is convex, and the optical power thereof is positive; The object plane side of the eighth lens is convex, and the image plane side is convex, and the optical power thereof is positive; Preferably, each lens of the optical system satisfies the following conditions: -11.5mm<f1<-5.5mm; -6.5mm<f2<-3.5mm; -9.3mm<f3<10.7mm; 3.6mm<f4<300mm; 3.9mm<f5<6.1mm; -3.1mm<f6<-1.5mm; 2.1mm<f7<4.5mm; 4.5mm < f8 < 17mm; wherein, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, and f8 is the focal length of the eighth lens.

[0005] Preferably, each lens of the optical system satisfies the following conditions: Nd1 > 1.71, Vd1 < 55; Nd2 > 1.50, Vd2 < 57; Nd3 > 1.62, Vd3 < 30; Nd4 < 1.95, Vd4 < 57; Nd5 < 1.6, Vd5 > 50; Nd6 > 1.62, Vd6 < 30; Nd7 > 1.50, Vd7 < 57; Nd8 > 1.50, Vd8 < 57; wherein, Nd1 is the refractive index of the first lens, Vd1 is the Abbe number of the first lens; Nd2 is the refractive index of the second lens, Vd2 is the Abbe number of the second lens; Nd3 is the refractive index of the third lens, Vd3 is the Abbe number of the third lens; Nd4 is the refractive index of the fourth lens, Vd4 is the Abbe number of the fourth lens; Nd5 is the refractive index of the fifth lens, Vd5 is the Abbe number of the fifth lens; Nd6 is the refractive index of the sixth lens, Vd6 is the Abbe number of the sixth lens; Nd7 is the refractive index of the seventh lens, Vd7 is the Abbe number of the seventh lens; and Nd8 is the refractive index of the eighth lens, Vd8 is the Abbe number of the eighth lens.

[0006] Preferably, the relative illumination of the maximum field of view of the optical system satisfies: RI ≥ 35%.

[0007] Preferably, the radius of curvature R1 of the object side of the first lens satisfies: R1 ≤ 15mm.

[0008] Preferably, the total track length TTL and the F-number FNO of the optical system satisfy: TTL ≤ 17.5 mm, FNO ≤ 1.6.

[0009] Preferably, the fourth lens or the fifth lens is a glass lens.

[0010] Preferably, the horizontal field angle FOV of the optical system satisfies: FOV ≥ 157°, and the maximum image circle MIC satisfies: MIC ≥ 6.2mm.

[0011] Preferably, the diaphragm is arranged between the fourth lens and the fifth lens.

[0012] Preferably, the sixth lens and the seventh lens are adhered to each other to form a combined lens.

[0013] In another aspect, the embodiments of the present application also provide a camera module, comprising at least an optical lens, wherein the optical lens is internally installed with the lens optical system.

[0014] Compared with the prior art, the present application has the following advantages: The present application provides a large-aperture optical system and a camera module using the same, which mainly comprises eight lenses, has a reasonable number of lenses and a simple structure, optimizes lens aberration by reasonably distributing the refractive power of the lenses, improves the imaging quality of the optical system, and has excellent characteristics of super wide angle, high illumination, day and night focus, and temperature characteristics, thus having great potential in the IPC market. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced.

[0016] Figure 1 is a structural schematic diagram of the optical system or the camera module of the embodiment 1 of the present application; Figure 2 is a curve diagram of astigmatism and distortion of the optical system or the camera module of the embodiment 1 of the present application; Figure 3 is a curve diagram of MTF of the optical system or the camera module of the embodiment 1 of the present application; Figure 4 is a structural schematic diagram of the optical system or the camera module of the embodiment 2 of the present application; Figure 5 is a curve diagram of astigmatism and distortion of the optical system or the camera module of the embodiment 2 of the present application; Figure 6 is a curve diagram of MTF of the optical system or the camera module of the embodiment 2 of the present application; Figure 7 is a structural schematic diagram of the optical system or the camera module of the embodiment 3 of the present application; Figure 8 is a curve diagram of astigmatism and distortion of the optical system or the camera module of the embodiment 3 of the present application; Figure 9 is a curve diagram of MTF of the optical system or the camera module of the embodiment 3 of the present application. DETAILED DESCRIPTION

[0017] As shown in Figures 1-9 , the present application provides a large-aperture optical system, which is composed of a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a stop STO, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, and an infrared filter 9 in sequence along an optical axis from an object plane to an image plane.

[0018] The object side of the first lens 1 is convex, the image side is concave, and the optical power is negative; The object side of the second lens 2 is convex, the image side is concave, and the optical power is negative; The third lens 3 has optical power; The fourth lens 4 has optical power; The object side of the fifth lens 5 is convex, the image side is convex, and the optical power is positive; The object side of the sixth lens 6 is concave, the image side is concave, and the optical power is negative; The object side of the seventh lens 7 is convex, the image side is convex, and the optical power is positive; The object side of the eighth lens 8 is convex, the image side is convex, and the optical power is positive. The application provides a large-aperture optical system and an application camera module thereof, which are mainly composed of eight lenses. The object side of the first lens is convex, the image side is concave, and the optical power is negative. The object side of the second lens is convex, the image side is concave, and the optical power is negative. The third lens has optical power. The fourth lens has optical power. The object side of the fifth lens is convex, the image side is convex, and the optical power is positive. The object side of the sixth lens is concave, the image side is concave, and the optical power is negative. The object side of the seventh lens is convex, the image side is convex, and the optical power is positive. The object side of the eighth lens is convex, the image side is convex, and the optical power is positive. The number of lenses is reasonable, the structure is simple, the optical power of the lenses is reasonably distributed, the lens aberration is optimized, the imaging quality of the optical system is improved, the characteristics of super wide angle, high illumination, day and night focus, and excellent temperature characteristics are considered, and the optical system has great potential in the IPC market.

[0019] Further, as a preferred embodiment of the application, each lens of the optical system satisfies the following conditions, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, and f8 is the focal length of the eighth lens: -11.5 mm < f1 < -5.5 mm, which can make the first lens 1 have a large negative optical power, and is beneficial to reduce the astigmatism and field curvature of the optical system; -6.5 mm < f2 < -3.5 mm, by constraining the ratio of the optical power of the second lens 2 to the effective focal length of the optical imaging system in a reasonable range, the spherical aberration of the system is fine-tuned and controlled, and the imaging quality of the system is effectively improved; -9.3mm < f3 < 10.7mm, by restricting the ratio of the power of the third lens 3 to the effective focal length of the optical imaging system within a reasonable range, the optical system has the advantages of super wide angle, large aperture, small volume, excellent temperature characteristics; 3.6mm < f4 < 300mm, by restricting the ratio of the power of the fourth lens 4 to the effective focal length of the optical imaging system within a reasonable range, the spherical aberration of the system is fine-tuned and controlled, thereby effectively improving the imaging quality of the system; 3.9mm < f5 < 6.1mm, by restricting the ratio of the power of the fifth lens 5 to the effective focal length of the optical imaging system within a reasonable range, the optical system has the advantages of super wide angle, large aperture, small volume, excellent temperature characteristics; -3.1mm < f6 < -1.5mm, by restricting the ratio of the power of the sixth lens 6 to the effective focal length of the optical imaging system within a reasonable range, the configured optical system has the advantages of super wide angle, small aperture, high illumination, excellent temperature characteristics, compact structure, easy to process and install, and at the same time, the configuration of large aperture can increase the light amount of the optical system and higher imaging quality.

[0020] 2.1mm < f7 < 4.5mm, by restricting the ratio of the power of the seventh lens 7 to the effective focal length of the optical imaging system within a reasonable range, the optical system has the advantage of excellent temperature characteristics; 4.5mm < f8 < 17mm, by restricting the ratio of the power of the eighth lens 8 to the effective focal length of the optical imaging system within a reasonable range, the field curvature of the optical system is effectively improved; Further, the refractive index Nd1 of the first lens 1 and the Abbe number Vd1 satisfy: Nd1 > 1.71, Vd1 < 55, this design can effectively reduce chromatic aberration, optimize lens aberration, and effectively improve the imaging quality of the system; Further, the refractive index Nd2 of the second lens 2 and the Abbe number Vd2 satisfy: Nd2 > 1.50, Vd2 < 57, this design can effectively reduce chromatic aberration, optimize lens aberration, and effectively improve the imaging quality of the system; Further, the refractive index Nd3 of the third lens 3 and the Abbe number Vd3 satisfy: Nd3 > 1.62, Vd3 < 30, this design can effectively reduce chromatic aberration, optimize lens aberration, and effectively improve the imaging quality of the system; Further, the refractive index Nd4 of the fourth lens 4 and the Abbe number Vd4 satisfy: Nd4 < 1.95, Vd4 < 57, this design can effectively reduce chromatic aberration, optimize lens aberration, and effectively improve the imaging quality of the system; Further, the refractive index Nd5 and the Abbe number Vd5 of the fifth lens 5 satisfy: Nd5 < 1.6, Vd5 > 50, which can effectively reduce chromatic aberration, optimize lens aberration, and further effectively improve the imaging quality of the system. Further, the refractive index Nd6 and the Abbe number Vd6 of the sixth lens 6 satisfy: Nd6 > 1.62, Vd6 < 30, which can effectively reduce chromatic aberration, optimize lens aberration, and further effectively improve the imaging quality of the system. Further, the refractive index Nd7 and the Abbe number Vd7 of the seventh lens 7 satisfy: Nd7 > 1.50, Vd7 < 57, which can effectively reduce chromatic aberration, optimize lens aberration, and further effectively improve the imaging quality of the system. Further, the refractive index Nd8 and the Abbe number Vd8 of the eighth lens 8 satisfy: Nd8 > 1.50, Vd8 < 57, which can effectively reduce chromatic aberration, optimize lens aberration, and further effectively improve the imaging quality of the system. Further, as a preferred embodiment of the present application but not limited, the relative illumination of the maximum field of view of the optical system satisfies: RI ≥ 35%, by controlling the relative illumination, the brightness of the edge field of view of the lens can be improved. Further, as a preferred embodiment of the present application but not limited, the curvature radius R1 of the object side of the first lens satisfies: R1 ≤ 15mm, by controlling the object side of the first lens 1, the total deflection angle of the object side of the first lens 1 at the edge field of view can be reasonably controlled within a reasonable range.

[0021] Further, as a preferred embodiment of the present application but not limited, the fourth lens is glass, which can effectively improve the focal shift at high and low temperatures.

[0022] Further, as a preferred embodiment of the present application but not limited, the total optical length TTL and the aperture FNO of the optical system satisfy: TTL ≤ 22.5 mm, FNO ≤ 1.6, which can reduce the total optical length, effectively miniaturize the lens, and increase the light amount of the system.

[0023] Further, as a preferred embodiment of the present application but not limited, the horizontal field angle FOV of the optical system satisfies: FOV ≥ 157°, and the maximum image circle MIC satisfies: MIC ≥ 6.2mm, which is beneficial to expand the field of view and meet the user's use demand. Further, as a preferred embodiment of the present application but not limited, the sixth lens and the seventh lens are bonded to form a combined lens, which increases the difference between the refractive index and the Abbe number of the lens, and can effectively reduce chromatic aberration.

[0024] Specifically, as a preferred embodiment of the present application but not limited, as shown inFigures 1-3 In the embodiment 1, the focal length f1 of the first lens 1 is -6.7mm, the focal length f2 of the second lens 2 is -4.9mm, the focal length f3 of the third lens 3 is 9.6mm, the focal length f4 of the fourth lens 4 is 216.2mm, the focal length f5 of the fifth lens 5 is 4.6mm, the focal length f6 of the sixth lens 6 is -2.5mm, the focal length f7 of the seventh lens 7 is 4.3mm, the focal length f8 of the eighth lens 8 is 5.6mm, the total track length TTL is 17.5mm, and the surface type, the radius of curvature, the thickness and the material parameters of each lens are shown in Table 1: Table 1: Basic parameters of the optical system in embodiment 1

[0025] In Table 1, along the optical axis from the object plane to the image plane, OBJ is the object plane; S1 and S2 correspond to the two surfaces of the first lens 1; S3 and S4 correspond to the two surfaces of the second lens 2; S5 and S6 correspond to the two surfaces of the third lens 3; S7 and S8 correspond to the two surfaces of the fourth lens 4; S9 and S10 correspond to the two surfaces of the fifth lens 5; S11 and S12 correspond to the two surfaces of the sixth lens 6; S12 and S13 correspond to the two surfaces of the seventh lens 7; S14 and S15 correspond to the two surfaces of the eighth lens 8; STO is the position of the stop; S16 and S17 correspond to the two surfaces of the filter; and IMA corresponds to the image plane.

[0026] Further, in Table 1, the surface type of each aspheric lens can be defined by, but not limited to, the following aspheric formula:

[0027] wherein x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the vertex of the aspheric surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface formula. Table 2 shows the conic coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of the aspheric surfaces that can be used in embodiment 1.

[0028] Table 2: Aspheric surface related values of the lenses in embodiment 1

[0029] Figure 2 The astigmatism and distortion curves of the optical imaging lens in embodiment 1 are shown, wherein the astigmatism represents the meridional image surface curvature and sagittal image surface curvature, and the distortion represents the distortion size value corresponding to different image heights. Figure 3The MTF curve of the optical imaging lens of embodiment 1 is shown, which represents the MTF values of different field of view meridian direction and sagittal direction at different spatial frequencies, as shown in Figure 2 and Figure 3 It can be seen that the optical imaging system given by embodiment 1 can achieve good imaging quality, with higher imaging quality.

[0030] Specifically, as a preferred embodiment of the present application but not limited, as shown in Figures 4-6 In this embodiment 2, the focal length f1 of the first lens 1 is -6.49mm, the focal length f2 of the second lens 2 is -5.0mm, the focal length f3 of the third lens 3 is 9.2mm, the focal length f4 of the fourth lens 4 is 217.5mm, the focal length f5 of the fifth lens 5 is 4.6mm, the focal length f6 of the sixth lens 6 is -2.4mm, the focal length f7 of the seventh lens 7 is 4.1mm, the focal length f8 of the eighth lens 8 is 5.8mm, the total optical length TTL is 17.5mm, and the surface type, curvature radius, thickness and material parameters of each lens are shown in Table 3: Table 3: Basic parameters of the optical system of embodiment 2

[0031] In the above table 3, along the optical axis from the object plane to the image plane, OBJ is the object plane; S1 and S2 correspond to the two surfaces of the first lens 1; S3 and S4 correspond to the two surfaces of the second lens 2; S5 and S6 correspond to the two surfaces of the third lens 3; S7 and S8 correspond to the two surfaces of the fourth lens 4; S9 and S10 correspond to the two surfaces of the fifth lens 5; S11 and S12 correspond to the two surfaces of the sixth lens 6; S12 and S13 correspond to the two surfaces of the seventh lens 7; S14 and S15 correspond to the two surfaces of the eighth lens 8; STO is the position of the stop; S16 and S17 correspond to the two surfaces of the filter; IMA corresponds to the image plane.

[0032] Further, the surface type of each aspheric lens can be defined by, but not limited to, the following aspheric formula:

[0033] Wherein, x is the distance from the corresponding point on the aspheric surface to the plane tangent to the surface vertex, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface formula. Table 4 gives the conic coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of each aspheric surface that can be used in embodiment 2.

[0034] Table 4: Aspheric surface related values of the lens surface of embodiment 2

[0035] Figure 5 The astigmatism and distortion curves of the optical imaging lens of embodiment 2 are shown, the astigmatism represents the meridional image surface curvature and sagittal image surface curvature, and the distortion represents the distortion size value corresponding to different image heights; Figure 6 The MTF curve of the optical imaging lens of embodiment 2 is shown, which represents the meridional direction and sagittal direction MTF values of different fields of view under different spatial frequencies, and the MTF curve is shown in the following figure: Figure 5 and Figure 6 It can be seen that the optical imaging system given by embodiment 2 can achieve good imaging quality and has higher imaging quality.

[0036] Specifically, as a preferred embodiment of the present application but not limited, as shown in Figures 7-9 In this embodiment 3, the focal length f1 of the first lens 1 is -10.6mm, the focal length f2 of the second lens 2 is -5.3mm, the focal length f3 of the third lens 3 is -4.6mm, the focal length f4 of the fourth lens 4 is 4.0mm, the focal length f5 of the fifth lens 5 is 4.0mm, the focal length f6 of the sixth lens 6 is -2.3mm, the focal length f7 of the seventh lens 7 is 2.9mm, the focal length f8 of the eighth lens 8 is 11.2mm, the total optical length TTL is 17.5mm, and the surface type, curvature radius, thickness and material parameters of each lens are shown in Table 5: Table 5: Basic parameters of the optical system of embodiment 3

[0037] In the above table 5, along the optical axis from the object plane to the image plane, OBJ is the object plane; S1 and S2 correspond to the two surfaces of the first lens 1; S3 and S4 correspond to the two surfaces of the second lens 2; S6 and S7 correspond to the two surfaces of the third lens 3; S8 and S9 correspond to the two surfaces of the fourth lens 4; S9 and S10 correspond to the two surfaces of the fifth lens 5; S11 and S12 correspond to the two surfaces of the sixth lens 6; STO is the position of the stop; S13 and S14 correspond to the two surfaces of the filter; IMA corresponds to the image plane.

[0038] Further, in Table 5, the object side surface and the image side surface of any one of the second lens 2, the third lens 4, the fifth lens 5 and the sixth lens 6 are aspherical surfaces, and the surface type of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0039] wherein x is the distance from the corresponding point on the aspherical surface to the plane tangent to the surface vertex, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the aspherical surface vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high order term in the aspherical surface formula. Table 6 shows the conic coefficients and high order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of the aspherical surfaces used in Example 3.

[0040] Table 6: Aspherical surface related values of the lens surface of Example 3

[0041] Figure 8 The astigmatism and distortion curves of the optical imaging lens of Example 3 are shown, wherein the astigmatism represents the meridional image surface curvature and sagittal image surface curvature, and the distortion represents the distortion size values corresponding to different image heights. Figure 9 The MTF curves of the optical imaging lens of Example 3 are shown, which represent the meridional and sagittal direction MTF values of different spatial frequencies at different fields of view. Figure 8 and Figure 9 It can be seen that the optical imaging system of Example 3 can achieve good imaging quality and has higher imaging quality.

[0042] Further, in Examples 1-3, the basic data are as follows: Table 7: Basic data of Examples 1-3

[0043] A camera module at least includes an optical lens, and the optical system is sequentially composed of 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 along the optical axis from the object plane to the image plane. By reasonably distributing the surface shape and optical power of each lens, the lens aberration is optimized, and the lens has excellent resolving power, high pixels, large aperture, no thermalization, day and night confocal, light weight and other characteristics, and has greater competitiveness in the IPC market.

[0044] The above is one or more embodiments provided in combination with specific content, and does not mean that the specific implementation of the present application is limited to these descriptions. Any approximation, similarity or replacement of the method and structure of the present application, or any technical deduction or replacement under the premise of the concept of the present application, should be considered as the protection scope of the present application.

Claims

1. A large aperture optical system, sequentially comprising 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 from an object plane to an image plane along an optical axis, characterized in that: the object plane side of the first lens is convex, the image plane side of the first lens is concave, and the first lens has a negative focal power; the object plane side of the second lens is convex, the image plane side of the second lens is concave, and the second lens has a negative focal power; the third lens has a focal power; the fourth lens has a focal power; the object plane side of the fifth lens is convex, the image plane side of the fifth lens is convex, and the fifth lens has a positive focal power; the object plane side of the sixth lens is concave, the image plane side of the sixth lens is concave, and the sixth lens has a negative focal power; the object plane side of the seventh lens is convex, the image plane side of the seventh lens is convex, and the seventh lens has a positive focal power; the object plane side of the eighth lens is convex, the image plane side of the eighth lens is convex, and the eighth lens has a positive focal power; each lens of the optical system satisfies the following conditions: -11.5mm < f1 < -5.5mm; -6.5mm < f2 < -3.5mm; -9.3mm < f3 < 10.7mm; 3.6mm < f4 < 300mm; 3.9mm < f5 < 6.1mm; -3.1mm < f6 < -1.5mm; 2.1mm < f7 < 4.5mm; 4.5mm < f8 < 17mm; wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, and f8 is the focal length of the eighth lens. Each lens of the optical system satisfies the following conditions: Nd1 > 1.71, Vd1 < 55; Nd2 > 1.50, Vd2 < 57; Nd3 > 1.62, Vd3 < 30; Nd4 < 1.95, Vd4 < 57; Nd5 < 1.6, Vd5 > 50; Nd6 > 1.62, Vd6 < 30; Nd7 > 1.50, Vd7 < 57; Nd8 > 1.50, Vd8 < 57; wherein Nd1 is the refractive index of the first lens, Vd1 is the Abbe number of the first lens; Nd2 is the refractive index of the second lens, Vd2 is the Abbe number of the second lens; Nd3 is the refractive index of the third lens, Vd3 is the Abbe number of the third lens; Nd4 is the refractive index of the fourth lens, Vd4 is the Abbe number of the fourth lens; Nd5 is the refractive index of the fifth lens, Vd5 is the Abbe number of the fifth lens; Nd6 is the refractive index of the sixth lens, Vd6 is the Abbe number of the sixth lens; Nd7 is the refractive index of the seventh lens, Vd7 is the Abbe number of the seventh lens; and Nd8 is the refractive index of the eighth lens, Vd8 is the Abbe number of the eighth lens. The relative luminance of the maximum field of view of the optical system satisfies: RI ≥ 35%. The curvature radius R1 of the object plane side of the first lens satisfies: R1 ≤ 15mm. The total optical length TTL and the aperture of the optical system satisfy: TTL ≤ 17.5mm, FNO ≤ 1.

6. The fourth lens or the fifth lens is a glass lens. The horizontal field angle FOV of the optical system satisfies: FOV ≥ 157°, and the maximum image circle MIC satisfies: MIC ≥ 6.2mm. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The high-aperture optical system according to claim 1, characterized by: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 3. The high-aperture optical system according to any one of claims 1 to 3, characterized by: ​ 4. The high-aperture optical system according to any one of claims 1 to 3, characterized by: ​ 5. The high-aperture optical system according to any one of claims 1 to 3, characterized by: ​ 6. The high-aperture optical system according to any one of claims 1 to 3, characterized by: ​ 7. The high-aperture optical system according to any one of claims 1 to 3, characterized by: ​ 8. The high-aperture optical system according to any one of claims 1 to 3, characterized by: The diaphragm is disposed between the fourth lens and the fifth lens.

9. The high-aperture optical system according to any one of claims 1 to 3, characterized by: The sixth lens and the seventh lens are adhered to each other to form a combined lens.

10. An image capturing module comprising at least an optical lens, characterized in that: The optical system of any one of claims 1-9 is installed in the optical lens.

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