Day and night confocal optical system and application of camera module thereof

Abstract

The application provides a day and night confocal optical system and an application camera module thereof, which mainly comprises seven lenses, the first lens has a convex object plane and a concave image plane, and has negative optical power; the second lens has a convex object plane and a concave image plane, and has negative optical power; the third lens has a concave object plane and a convex image plane, and has positive optical power; the fourth lens has a convex object plane and a convex image plane, and has positive optical power; the fifth lens has a convex object plane and a convex image plane, and has positive optical power; the sixth lens has a concave object plane and a concave image plane, and has negative optical power; and the seventh lens has a convex object plane and a convex image plane, and has positive optical power. 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 ultra-wide angle, high illumination, day and night confocal and excellent temperature characteristics are considered, and the application has great potential in the IPC market.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging, in particular to a day and night confocal optical system and an application of a camera module thereof. 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 day and night confocal optical system, which optimizes lens aberration by reasonably distributing the surface shape and optical power of each lens, and has excellent resolving power, high pixel, large aperture, no thermalization, day and night confocal, light weight and other characteristics, and has greater competitiveness in the IPC market.

[0004] An optical system is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence from an object plane to an image plane along an optical axis:

[0005] The object plane side of the first lens is convex, and the image plane side is concave, and the optical power is negative;

[0006] The object plane side of the second lens is convex, and the image plane side is concave, and the optical power is negative;

[0007] The object plane side of the third lens is concave, and the image plane side is convex, and the optical power is positive;

[0008] The object plane side and the image plane side of the fourth lens are both convex, and the optical power is positive;

[0009] The object plane side and the image plane side of the fifth lens are both convex, and the optical power is positive;

[0010] The object plane side and the image plane side of the sixth lens are both concave, and the optical power is negative;

[0011] The object plane side and the image plane side of the seventh lens are both convex, and the optical power is positive.

[0012] Preferably, each lens of the optical system satisfies the following conditions:

[0013] -10.5mm<f1<-6.5mm;

[0014] -6.1 mm<f2<-3.9mm;

[0015] 9.5mm<f3<15.5mm;

[0016] 5.3mm < f4 < 7.5mm;

[0017] 8.5mm < f5 < 13.5mm;

[0018] -5.5mm < f6 < -3.9mm;

[0019] 3.5mm < f7 < 6.5mm;

[0020] 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, and f7 is the focal length of the seventh lens.

[0021] Preferably, each lens of the optical system satisfies the following conditions:

[0022] Nd1 > 1.51, Vd1 < 65;

[0023] Nd2 > 1.53, Vd2 < 56;

[0024] Nd3 > 1.66, Vd3 < 25;

[0025] Nd4 > 1.47, Vd4 < 85;

[0026] Nd5 > 1.53, Vd5 < 56;

[0027] Nd6 > 1.66, Vd6 < 25;

[0028] Nd7 > 1.53, Vd7 < 56;

[0029] 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; and Nd7 is the refractive index of the seventh lens, Vd7 is the Abbe number of the seventh lens.

[0030] Preferably, the relative luminance of the maximum field of view of the optical system satisfies: RI ≥ 35%.

[0031] Preferably, the radius of curvature R1 of the object side of the first lens satisfies: R1 > 25mm.

[0032] Preferably, the total optical length TTL of the optical system satisfies: TTL ≤ 25 mm.

[0033] Preferably, the fourth lens is a glass or plastic lens.

[0034] Preferably, the horizontal field angle FOV of the optical system satisfies: FOV≥185°, and the maximum image circle MIC satisfies: MIC≥5.8mm.

[0035] Preferably, the diaphragm is arranged between the third lens and the fourth lens.

[0036] Preferably, the fifth lens and the sixth lens are bonded to form a combined lens.

[0037] In another aspect, the application also provides a camera module, which at least comprises an optical lens, and the optical lens is internally mounted with the above lens optical system.

[0038] Compared with the prior art, the application has the following beneficial effects:

[0039] The application provides a day and night confocal optical system and a camera module applying the same, which mainly comprises seven lenses, the first lens has a convex object plane and a concave image plane, and has negative optical power; the second lens has a convex object plane and a concave image plane, and has negative optical power; the third lens has a concave object plane and a convex image plane, and has positive optical power; the fourth lens has a convex object plane and a convex image plane, and has positive optical power; the fifth lens has a convex object plane and a convex image plane, and has positive optical power; the sixth lens has a concave object plane and a concave image plane, and has negative optical power; and the seventh lens has a convex object plane and a convex image plane, and has positive optical power. 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 confocal and excellent temperature characteristics are considered, and the application has great potential in the IPC market. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced.

[0041] Figure 1 is a structural schematic diagram of the optical system or the camera module in Embodiment 1 of the application;

[0042] Figure 2 is an astigmatism and distortion curve diagram of the optical system or the camera module in Embodiment 1 of the application;

[0043] Figure 3 is an MTF curve diagram of the optical system or the camera module in Embodiment 1 of the application;

[0044] Figure 4 is a structural schematic diagram of the optical system or the camera module in Embodiment 2 of the application;

[0045] Figure 5 is a astigmatism and distortion curve of the optical system or camera module of embodiment 2 of the present application;

[0046] Figure 6 is a MTF curve of the optical system or camera module of embodiment 2 of the present application.

[0047] Figure 7 is a structure diagram of the optical system or camera module of embodiment 3 of the present application;

[0048] Figure 8 is a astigmatism and distortion curve of the optical system or camera module of embodiment 3 of the present application;

[0049] Figure 9 is a MTF curve of the optical system or camera module of embodiment 3 of the present application. DETAILED DESCRIPTION

[0050] As shown in Figures 1-9 , the present application provides a day and night confocal optical system, which is composed of a first lens 1, a second lens 2, a third lens 3, a diaphragm 8, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an infrared filter 9, and a chip protection glass 10 in sequence along the optical axis from the object plane to the image plane.

[0051] The object plane side of the first lens is convex, the image plane side is concave, and the optical power is negative;

[0052] The object plane side of the second lens is convex, the image plane side is concave, and the optical power is negative;

[0053] The object plane side of the third lens is concave, the image plane side is convex, and the optical power is positive;

[0054] The object plane side and the image plane side of the fourth lens are both convex, and the optical power is positive;

[0055] The object plane side and the image plane side of the fifth lens are both convex, and the optical power is positive;

[0056] The object plane side and the image plane side of the sixth lens are both concave, and the optical power is negative;

[0057] The object plane side and the image plane side of the seventh lens are both convex, and the optical power is positive;

[0058] The application provides a day and night confocal optical system and an application camera module thereof, which mainly comprises seven lenses.

[0059] Further, as a preferred embodiment of the application but not limited, 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, and f7 is the focal length of the seventh lens:

[0060] -10.5mm < f1 < -6.5mm, which can make the first lens 1 have a large negative focal length, and is beneficial to reduce the astigmatism and field curvature of the optical system;

[0061] -6.1mm < f2 < -3.9mm, by constraining the ratio of the focal length 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;

[0062] 9.5mm < f3 < 15.5mm, by constraining the ratio of the focal length of the third lens 3 to the effective focal length of the optical imaging system in a reasonable range, the optical system has the advantages of super wide angle, large aperture, small volume and excellent temperature characteristics;

[0063] 5.3mm < f4 < 7.5mm, by constraining the ratio of the focal length of the fourth lens 4 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;

[0064] 8.5mm < f5 < 13.5mm, by constraining the ratio of the focal length of the fifth lens 5 to the effective focal length of the optical imaging system in a reasonable range, the optical system has the advantages of super wide angle, large aperture, small volume and excellent temperature characteristics;

[0065] -5.5mm < f6 < -3.9mm, by restricting the ratio of the sixth lens 6 power and the effective focal length of the optical imaging system in a reasonable range, so that the configured optical system has the advantages of super wide angle, small aperture, high illumination, excellent temperature characteristics, compact structure, easy processing and installation, at the same time, the configuration of large aperture can increase the light amount of optical system and higher imaging quality.

[0066] 3.5mm < f7 < 6.5mm, by restricting the ratio of the seventh lens 7 power and 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;

[0067] Further, the refractive index Nd1 and the Abbe number Vd1 of the first lens 1 satisfy: Nd1 > 1.51, Vd1 < 65, which can effectively reduce chromatic aberration, optimize lens aberration, and effectively improve the imaging quality of the system;

[0068] Further, the refractive index Nd2 and the Abbe number Vd2 of the second lens 2 satisfy: Nd2 > 1.53, Vd2 < 56, which can effectively reduce chromatic aberration, optimize lens aberration, and effectively improve the imaging quality of the system;

[0069] Further, the refractive index Nd3 and the Abbe number Vd3 of the third lens 3 satisfy: Nd3 > 1.66, Vd3 < 25, which can effectively reduce chromatic aberration, optimize lens aberration, and effectively improve the imaging quality of the system;

[0070] Further, the refractive index Nd4 and the Abbe number Vd4 of the fourth lens 4 satisfy: Nd4 > 1.47, Vd4 < 85, which can effectively reduce chromatic aberration, optimize lens aberration, and effectively improve the imaging quality of the system;

[0071] Further, the refractive index Nd5 and the Abbe number Vd5 of the fifth lens 5 satisfy: Nd5 > 1.53, Vd5 < 56, which can effectively reduce chromatic aberration, optimize lens aberration, and effectively improve the imaging quality of the system;

[0072] Further, the refractive index Nd6 and the Abbe number Vd6 of the sixth lens 6 satisfy: Nd6 > 1.66, Vd6 < 25, which can effectively reduce chromatic aberration, optimize lens aberration, and effectively improve the imaging quality of the system;

[0073] Further, the refractive index Nd7 and the Abbe number Vd7 of the seventh lens 7 satisfy: Nd7 > 1.53, Vd7 < 56, which can effectively reduce chromatic aberration, optimize lens aberration, and effectively improve the imaging quality of the system;

[0074] 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;

[0075] Further, as a preferred embodiment of the present application but not limited, the curvature radius R1 of the first lens on the object side satisfies: R1 > 25mm, by controlling the first lens 1 on the object side, the total deflection angle of the first lens 1 on the object side at the edge field of view can be reasonably controlled within a reasonable range.

[0076] Further, as a preferred embodiment of the present application but not limited, the fourth lens is glass, which can effectively improve the focal point offset at high and low temperatures.

[0077] Further, as a preferred embodiment of the present application but not limited, the total optical length TTL of the optical system satisfies: TTL ≤ 25mm, this design can reduce the total optical length, which can effectively miniaturize the lens.

[0078] Further, as a preferred embodiment of the present application but not limited, the horizontal field angle FOV of the optical system satisfies: FOV ≥ 185°, and the maximum image circle MIC satisfies: MIC ≥ 5.8mm, which is beneficial to expand the field of view and meet the user's use demand;

[0079] Further, as a preferred embodiment of the present application but not limited, the fifth lens and the sixth 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 the chromatic aberration.

[0080] Specifically, as a preferred embodiment of the present application but not limited, as shown in Figures 1-3 In this embodiment 1, the focal length f1 of the first lens 1 is -9.1mm, the focal length f2 of the second lens 2 is -5.91mm, the focal length f3 of the third lens 3 is 13.51mm, the focal length f4 of the fourth lens 4 is 6.76mm, the focal length f5 of the fifth lens 5 is 9.1mm, the focal length f6 of the sixth lens 6 is -4.03mm, the focal length f7 of the seventh lens 7 is 4.76mm, and the total optical length TTL is 24mm. The surface type, curvature radius, thickness and material parameters of each lens are shown in Table 1:

[0081] Table 1: Basic parameters of the optical system of embodiment 1

[0082]

[0083] In Table 1 above, 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; S8 and S9 correspond to the two surfaces of the fourth lens 4; S10 and S11 correspond to the two surfaces of the fifth lens 5; S12 and S13 correspond to the two surfaces of the sixth lens 6; S13 and S14 correspond to the two surfaces of the seventh lens 7; STO is the position of the stop; S15 and S16 correspond to the two surfaces of the filter; S17 and S18 correspond to the two surfaces of the chip protection glass; and IMA corresponds to the image plane.

[0084] Further, in Table 1, the object side surface and the image side surface of any one of the second lens 2, the third lens 3, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are aspherical surfaces, and the surface shape of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0085]

[0086] wherein x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface formula. Table 2 shows the conic coefficients and the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the aspherical surfaces that can be used in Embodiment 1.

[0087] Table 2: Aspherical surface related values of the lens surfaces in Embodiment 1

[0088]

[0089] Figure 2 The astigmatism and distortion curves of the optical imaging lens of Embodiment 1 are shown, wherein the astigmatism represents the meridional image surface curvature and the sagittal image surface curvature, and the distortion represents the distortion size values corresponding to different image heights; Figure 3 The MTF curves of the optical imaging lens of Embodiment 1 are shown, which represent the meridional and sagittal MTF values in different fields of view at different spatial frequencies, and are shown in Figure 2 and Figure 3 It can be seen that the optical imaging system of Embodiment 1 can achieve good imaging quality and has higher imaging quality.

[0090] Specifically, as a preferred embodiment of the present application but not limited, as Figures 4-6As shown in the present embodiment 2, the focal length f1 of the first lens 1 is -8.93 mm, the focal length f2 of the second lens 2 is -4.99 mm, the focal length f3 of the third lens 3 is 10.98 mm, the focal length f4 of the fourth lens 4 is 6.3 mm, the focal length f5 of the fifth lens 5 is 10.8 mm, the focal length f6 of the sixth lens 6 is -3.94 mm, the focal length f6 of the seventh lens 7 is 4.49 mm, the total optical length TTL is 24 mm, and the surface type, the radius of curvature, the thickness and the material parameters of each lens are shown in Table 3:

[0091] Table 3: Basic parameters of the optical system in embodiment 2

[0092]

[0093] In Table 3 above, 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; S8 and S9 correspond to the two surfaces of the fourth lens 4; S10 and S11 correspond to the two surfaces of the fifth lens 5; S12 and S13 correspond to the two surfaces of the sixth lens 6; S13 and S14 correspond to the two surfaces of the seventh lens 7; STO is the position of the stop; S15 and S16 correspond to the two surfaces of the filter; S17 and S18 correspond to the two surfaces of the chip protection glass; and IMA corresponds to the image plane.

[0094] Further, in Table 3, the object side surface and the image side surface of any one of the second lens 2, the third lens 3, the fifth lens 5, the sixth lens 6 and the seventh lens 7 are aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0095]

[0096] wherein x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface formula. Table 4 shows the conic coefficients and the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of the aspherical surfaces that can be used in embodiment 2.

[0097] Table 4: Aspherical surface related values of the lens surfaces in embodiment 2

[0098]

[0099] Figure 5The 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 at different spatial frequencies, by 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.

[0100] 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 -8.83mm, the focal length f2 of the second lens 2 is -4.93mm, the focal length f3 of the third lens 3 is 10.68mm, the focal length f4 of the fourth lens 4 is 6.21mm, the focal length f5 of the fifth lens 5 is 12.17mm, the focal length f6 of the sixth lens 6 is -4.04mm, the focal length f7 of the seventh lens 7 is 4.43mm, the total optical length TTL is 24mm, and the surface type, curvature radius, thickness and material parameters of each lens are shown in Table 5:

[0101] Table 5: Basic parameters of the optical system of embodiment 3

[0102]

[0103] In Table 5 above, 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; S8 and S9 correspond to the two surfaces of the fourth lens 4; S10 and S11 correspond to the two surfaces of the fifth lens 5; S12 and S13 correspond to the two surfaces of the sixth lens 6; S13 and S14 correspond to the two surfaces of the seventh lens 7; STO is the position of the stop; S15 and S16 correspond to the two surfaces of the filter; S17 and S18 correspond to the two surfaces of the chip protection glass; and IMA corresponds to the image plane.

[0104] Further, in Table 5, the object side surface and the image side surface of any one of the second lens 2, the third lens 3, the fifth lens 5, the sixth lens 6 and the seventh lens 7 are aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0105]

[0106] 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.

[0107] Table 6: Aspherical surface related values of the lens surface of Example 3

[0108]

[0109] 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.

[0110] Further, in Examples 1-3, the basic data are as follows:

[0111] Table 7: Basic data of Examples 1-3

[0112]

[0113] 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 and a seventh 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, so that it has excellent resolving power, high pixels, large aperture, no thermalization, day and night focus, light weight and other characteristics, and has greater competitiveness in the IPC market.

[0114] 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 day and night confocal optical system, sequentially comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens along an optical axis from an object plane to an image plane, characterized in that: the object plane side of the first lens is convex, the image plane side is concave, and the optical power is negative; the object plane side of the second lens is convex, the image plane side is concave, and the optical power is negative; the object plane side of the third lens is concave, the image plane side is convex, and the optical power is positive; the object plane side and the image plane side of the fourth lens are both convex, and the optical power is positive; the object plane side and the image plane side of the fifth lens are both convex, and the optical power is positive; the object plane side and the image plane side of the sixth lens are both concave, and the optical power is negative; the object plane side and the image plane side of the seventh lens are both convex, and the optical power is positive; each lens of the optical system satisfies the following conditions: -10.5mm < f1 < -6.5mm; -6.1 mm < f2 < -3.9mm; 9.5mm < f3 < 15.5mm; 5.3mm < f4 < 7.5mm; 8.5mm < f5 < 13.5mm; -5.5mm < f6 < -3.9mm; 3.5mm < f7 < 6.5mm; 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, and f7 is the focal length of the seventh lens. each lens of the optical system satisfies the following conditions: Nd1 > 1.51, Vd1 < 65; Nd2 > 1.53, Vd2 < 56; Nd3 > 1.66, Vd3 < 25; Nd4 > 1.47, Vd4 < 85; Nd5 > 1.53, Vd5 < 56; Nd6 > 1.66, Vd6 < 25; Nd7 > 1.53, Vd7 < 56; 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; and Nd7 is the refractive index of the seventh lens, Vd7 is the Abbe number of the seventh 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 > 25mm. The total optical length TTL of the optical system satisfies: TTL ≤ 25mm. The fourth lens is a glass lens. The horizontal field angle FOV of the optical system satisfies: FOV ≥ 185°, and the maximum image circle MIC satisfies: MIC ≥ 5.8mm. A diaphragm is arranged between the third lens and the fourth lens. The fifth lens and the sixth lens are bonded to form a combined lens. The optical lens is provided with the optical system according to any one of claims 1-9. ​ ​ ​ ​ ​ ​ ​ 2. The day and night confocal optical system according to claim 1, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ 3. The day and night confocal optical system according to claim 1, characterized in that: ​ 4. The day and night confocal optical system according to any one of claims 1 to 3, characterized in that: ​ 5. The day and night confocal optical system according to any one of claims 1-3, characterized in that: ​ 6. The day and night confocal optical system according to any one of claims 1 to 3, characterized in that: ​ 7. The day and night confocal optical system according to any one of claims 1 to 3, characterized in that: ​ 8. The day and night confocal optical system according to any one of claims 1-3, characterized in that: ​ 9. The day and night confocal optical system according to any one of claims 1-3, characterized in that: ​ 10. An image capturing module comprising at least an optical lens, characterized in that: ​

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