A high-pixel day and night confocal optical system and an application camera lens thereof

Abstract

The application provides a high-pixel day and night confocal optical system and an application camera lens thereof, and the optical system is mainly composed of eight lenses; the first lens has a convex object plane and a concave image plane, and has negative optical power; the second lens has negative optical power; the third lens has negative optical power; the fourth lens 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 convex object plane and a convex image plane, and has positive optical power; the seventh lens has negative optical power; and the eighth lens has a concave object plane and a convex image plane. The number of lenses is reasonable, the optical power of the lenses is reasonably distributed, the lens aberration is optimized, the resolution performance is improved, the lens has high pixels, a large target surface of 1 / 1.8 inches, a large aperture and excellent resolution, and the lens has greater competitiveness in the market.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging, in particular to a high-pixel day and night confocal optical system and an application of the camera lens thereof. BACKGROUND

[0002] With the progress of science and technology and the development of social economy, camera lenses are widely used in security or driving recorders. However, the camera lenses or optical systems of the prior art have the defect of poor day and night effect, and it is difficult to meet the use of users. SUMMARY

[0003] In order to overcome the technical problem of poor day and night effect of the existing vehicle-mounted optical lens, the present application provides a high-pixel day and night confocal optical system, which is mainly composed of eight lens elements. The number of lens elements is reasonable, the lens power is reasonably distributed, the lens aberration is optimized, the resolution performance is improved, the lens has high pixels, a large target surface of 1 / 1.8 inches, a large aperture, and excellent resolving power, so that the lens has greater competitiveness in the fields of security and driving recorders.

[0004] A high-pixel day and night confocal optical system 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 along an optical axis from an object plane to an image plane.

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

[0006] The lens power of the second lens is negative.

[0007] The lens power of the third lens is negative.

[0008] The lens power of the fourth lens is positive.

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

[0010] The object side and the image side of the sixth lens are both convex, and the lens power is positive.

[0011] The lens power of the seventh lens is negative.

[0012] The object side of the eighth lens is concave, and the image side is convex.

[0013] Preferably, each lens of the optical system satisfies the following conditions: -3.50 < f1 / f < -2.50; -2.90 < f2 / f < -2.60; -5.50 < f3 / f < -2.20; 1.90 < f4 / f < 3.40; 2.10 < f5 / f < 2.70; 1.20 < f6 / f < 1.80; -2.50 < f7 / f < -0.90; -35.00 < f8 / f < 6.00; wherein f is the focal length of the entire optical system, 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.

[0014] Preferably, the radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side satisfy: 3.5 < (R1+R2) / R2 < 4.6.

[0015] Preferably, the optical system satisfies the following condition: 0.01 < f / TTL*ImagH < 0.04;

[0016] wherein f is the effective focal length of the optical system, TTL is the axial distance from the object side of the first lens to the imaging surface, and ImagH is half of the diagonal length of the effective pixel area on the imaging surface.

[0017] Preferably, the material refractive index Nd1 and the material Abbe number constant Vd1 of the first lens satisfy: 1.60 < Nd1 < 2.00, 50.00 < Vd1 < 60.00;

[0018] The material refractive index Nd2 and the material Abbe number constant Vd2 of the second lens satisfy: 1.51 < Nd2 < 1.72, 20.20 < Vd2 < 25.00;

[0019] The material refractive index Nd3 and the material Abbe number constant Vd3 of the third lens satisfy: 1.45 < Nd3 < 1.70, 50.00 < Vd3 < 60.00;

[0020] The material refractive index Nd4 and the material Abbe number constant Vd4 of the fourth lens satisfy: 1.50 < Nd4 < 1.70, 20.00 < Vd4 < 30.00;

[0021] The material refractive index Nd5 and the material Abbe number constant Vd5 of the fifth lens satisfy: 1.40 < Nd5 < 1.63, 80.00 < Vd5 < 95.00;

[0022] The material refractive index Nd6 and the material Abbe number constant Vd6 of the sixth lens satisfy: 1.50 < Nd6 < 1.75, 60.00 < Vd6 < 70.00;

[0023] The material refractive index Nd7 of the seventh lens and the material Abbe number constant Vd7 satisfy: 1.75 < Nd7 < 1.95, 17.00 < Vd7 < 28.00;

[0024] The material refractive index Nd8 of the eighth lens and the material Abbe number constant Vd8 satisfy: 1.47 < Nd8 < 1.65, 50.00 < Vd8 < 60.00.

[0025] Preferably, the first lens, the fifth lens, the sixth lens, and the seventh lens are spherical lenses, and the second lens, the third lens, the fourth lens, and the eighth lens are aspherical lenses.

[0026] Preferably, the total track length TTL of the optical system satisfies: TTL < 25.6 mm.

[0027] Preferably, the full field of view FOV of the optical system satisfies: 130° < FOV < 150°.

[0028] Preferably, the refractive index Nd6 and the Abbe number Vd6 of the sixth lens and the refractive index Nd7 and the Abbe number Vd7 of the seventh lens satisfy: 0.80 < Nd6 / Nd7 < 1.15, 2.4 < Vd6 / Vd7 < 4.2.

[0029] Preferably, the stop of the optical system is located between the fourth lens and the fifth lens.

[0030] In another aspect, the embodiments of the present application also provide a camera lens, wherein the camera lens is internally installed with the high-pixel day-and-night confocal optical system.

[0031] Compared with the prior art, the present application has the following beneficial effects:

[0032] The present application provides a high-pixel day-and-night confocal optical system and a camera lens applied thereto, which is mainly composed of eight lenses, the number of lenses is reasonable, the lens power is reasonably distributed, the lens aberration is optimized, the resolving performance is improved, and the lens has high pixels, a large target surface of 1 / 1.8 inches, a large aperture, and excellent resolving power, so that the lens has greater competitiveness in the market. BRIEF DESCRIPTION OF DRAWINGS

[0033] 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 as follows.

[0034] Figure 1 is a structural schematic diagram of the optical system or the camera lens of the embodiment 1 of the present application;

[0035] Figure 2 is a field curvature and distortion curve diagram of the optical system or the camera lens of the embodiment 1 of the present application;

[0036] Figure 3 is a MTF curve diagram of the optical system or camera lens of Embodiment 1 of the present application;

[0037] Figure 4 is a structure schematic diagram of the optical system or camera lens of Embodiment 2 of the present application;

[0038] Figure 5 is a field curvature and distortion curve diagram of the optical system or camera lens of Embodiment 2 of the present application;

[0039] Figure 6 is a MTF curve diagram of the optical system or camera lens of Embodiment 2 of the present application;

[0040] Figure 7 is a structure schematic diagram of the optical system or camera lens of Embodiment 3 of the present application;

[0041] Figure 8 is a field curvature and distortion curve diagram of the optical system or camera lens of Embodiment 3 of the present application;

[0042] Figure 9 is a MTF curve diagram of the optical system or camera lens of Embodiment 3 of the present application. DETAILED DESCRIPTION

[0043] The present application provides a high-pixel day and night confocal optical system, which is composed of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a stop STO, a fifth lens E5, a sixth lens E6, a seventh lens E7 and an eighth lens E8 in sequence along an optical axis from an object plane to an image plane;

[0044] The first lens E1 is convex on the object plane side and concave on the image plane side, and has a negative refractive power;

[0045] The second lens E2 has a negative refractive power;

[0046] The third lens E3 has a negative refractive power;

[0047] The fourth lens E4 has a positive refractive power;

[0048] The fifth lens E5 is convex on both the object plane side and the image plane side, and has a positive refractive power;

[0049] The sixth lens E6 is convex on both the object plane side and the image plane side, and has a positive refractive power;

[0050] The seventh lens E7 has a negative refractive power;

[0051] The eighth lens E8 is concave on the object plane side and convex on the image plane side;

[0052] The optical system of the embodiment of the application is mainly composed of 8 lenses, the number of lenses is reasonable, the lens aberration is optimized by reasonably distributing the refractive power of the lenses, the resolving performance is improved, the lens has high pixels, a large target surface of 1 / 1.8 inches, a large aperture and excellent resolving power, and the lens has greater competitiveness in the market.

[0053] Further, as a preferred embodiment of the application but not limited, each lens of the optical system satisfies the following conditions:

[0054] -3.50

[0055] -2.90

[0056] -5.50

[0057] 1.90

[0058] 2.10

[0059] 1.20

[0060] -2.50

[0061] -35.00

[0062] Wherein, f is the focal length of the entire optical system, f1 is the focal length of the first lens E1, f2 is the focal length of the second lens E2, f3 is the focal length of the third lens E3, f4 is the focal length of the fourth lens E4, f5 is the focal length of the fifth lens E5, f6 is the focal length of the sixth lens E6, f7 is the focal length of the seventh lens E7, and f8 is the focal length of the eighth lens E8.

[0063] Further, the refractive index Nd1 and the Abbe number Vd1 of the first lens E1 satisfy 1.60 < Nd1 < 2.00 and 50.00 < Vd1 < 60.00, which can effectively reduce chromatic aberration, optimize lens aberration, and further improve the imaging quality of the system.

[0064] Further, the refractive index Nd2 and the Abbe number Vd2 of the second lens E2 satisfy 1.51 < Nd2 < 1.72 and 20.20 < Vd2 < 25.00, which can effectively reduce chromatic aberration, optimize lens aberration, and further improve the imaging quality of the system.

[0065] Further, the refractive index Nd3 and the Abbe number Vd3 of the third lens E3 satisfy 1.45 < Nd3 < 1.70 and 50.00 < Vd3 < 60.00, which can effectively reduce chromatic aberration, optimize lens aberration, and further improve the imaging quality of the system.

[0066] Further, the refractive index Nd4 and the Abbe number Vd4 of the fourth lens E4 satisfy 1.50 < Nd4 < 1.70 and 20.00 < Vd4 < 30.00, which can effectively reduce chromatic aberration, optimize lens aberration, and further improve the imaging quality of the system.

[0067] Further, the refractive index Nd5 and the Abbe number Vd5 of the fifth lens E5 satisfy 1.40 < Nd5 < 1.63 and 80.00 < Vd5 < 95.00, which can effectively reduce chromatic aberration, optimize lens aberration, and further improve the imaging quality of the system.

[0068] Further, the refractive index Nd6 and the Abbe number Vd6 of the sixth lens E6 satisfy 1.50 < Nd6 < 1.75 and 60.00 < Vd6 < 70.00, which can effectively reduce chromatic aberration, optimize lens aberration, and further improve the imaging quality of the system.

[0069] Further, the refractive index Nd7 and the Abbe number Vd7 of the seventh lens E7 satisfy 1.75 < Nd7 < 1.95 and 17.00 < Vd7 < 28.00, which can effectively reduce chromatic aberration, optimize lens aberration, and further improve the imaging quality of the system.

[0070] Further, the refractive index Nd8 and the Abbe number Vd8 of the eighth lens E8 satisfy 1.47 < Nd8 < 1.65 and 50.00 < Vd8 < 60.00, which can effectively reduce chromatic aberration, optimize lens aberration, and further improve the imaging quality of the system.

[0071] Further, as a preferred embodiment of the present application but not limited, the first lens E1, the fifth lens E5, the sixth lens E6 and the seventh lens E7 are spherical lenses, and the second lens E2, the third lens E3, the fourth lens E4 and the eighth lens E8 are aspherical lenses. By reasonably distributing the lens surface type, the lens aberration is optimized, the resolution performance is improved, and the high pixel, large target 1 / 1.8 inch, large aperture and excellent resolving power are achieved.

[0072] Further, as a preferred embodiment of the present application but not limited, the first lens E1, the fifth lens E5, the sixth lens E6 and the seventh lens E7 are spherical lenses, and the second lens E2, the third lens E3, the fourth lens E4 and the eighth lens E8 are aspherical lenses. By reasonably distributing the lens surface type, the lens aberration is optimized, the resolution performance is improved, and the high pixel, large target 1 / 1.8 inch, large aperture and excellent resolving power are achieved.

[0073] Further, as a preferred embodiment of the present application but not limited, the total field of view FOV of the optical system satisfies: 130°≤FOV≤150°, which meets the large field of view of the lens and is beneficial to the application of the lens in the market.

[0074] Further, as a preferred embodiment of the present application but not limited, the total length TTL of the optical system satisfies: TTL≤25.6mm, which has the advantages of compact structure, easy processing and installation.

[0075] Further, as a preferred embodiment of the present application but not limited, among the fourth lens E4 and the fifth lens E5, the refractive index Nd4 and the Abbe number Vd4 of the fourth lens E4, and the refractive index Nd5 and the Abbe number Vd5 of the fifth lens E5 satisfy: 0.80<Nd6 / Nd7<1.15, 2.4<Vd6 / Vd7<4.2, which increases the difference between the refractive index and the Abbe number of the lens, and effectively reduces the chromatic aberration.

[0076] Specifically, as a preferred embodiment of the present application but not limited, Figure 1 The structure schematic diagram of the optical imaging lens according to the embodiment 1 of the present application is shown as Figure 1As shown, the first lens E1 has negative refractive power, the object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative refractive power, the object side surface S3 is concave, and the image side surface S4 is concave. The third lens E3 has negative refractive power, the object side surface S5 is concave, and the image side surface S6 is convex. The fourth lens E4 has positive refractive power, the object side surface S7 is convex, and the image side surface S8 is concave. The fifth lens E5 has positive refractive power, the object side surface S10 is convex, and the image side surface S11 is convex. The sixth lens E6 and the seventh lens E7 are cemented lenses. The sixth lens E6 has positive refractive power, the object side surface S12 is convex, and the image side surface S13 is convex. The seventh lens E7 has negative refractive power, the object side surface S13 is concave, and the image side surface S14 is convex. The eighth lens E8 has negative refractive power, the object side surface S15 is convex, and the image side surface S16 is concave. The filter E9 has an object side surface S17 and an image side surface S18. Light from an object sequentially passes through the surfaces S1 to S18 and is finally imaged on the imaging surface S19.

[0077] Table 1 shows the surface type, radius of curvature, thickness and material of each lens of the optical imaging lens of Example 1, wherein the units of the radius of curvature and the thickness are millimeters (mm):

[0078] Table 1: Basic parameters of the optical system of Example 1

[0079] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 18.633 0.820 1.69,55.53 S2 spherical surface 5.268 1.495 S3 Aspheric -10.292 0.655 1.63,23.55 S4 Aspheric 16.838 2.799 S5 Aspheric -2.805 0.858 1.53,55.71 S6 Aspheric -4.196 0.096 S7 Aspheric 6.422 1.693 1.63,23.55 S8 Aspheric 43.758 0.578 STO spherical surface endless 1.276 S10 spherical surface 7.717 3.325 1.43,94.52 S11 spherical surface -7.717 0.755 S12 spherical surface 12.740 3.406 1.59,68.34 S13 spherical surface -4.507 0.515 1.94,17.94 S14 spherical surface -10.708 0.661 S15 Aspheric 10.421 0.839 1.53,55.71 S16 Aspheric 8.729 1.000 S17 spherical surface endless 0.800 1.51,64.19 S18 spherical surface endless 2.931 S19 spherical surface endless

[0080] In Table 1 above, the object side surface and the image side surface of any one of the second lens E2, the third lens E3, the fourth lens E4 to the eighth lens E8 are aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0081]

[0082] wherein x is the distance from a corresponding point on the aspherical surface to a 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 coefficient and the high order term coefficients A4, A6, A8, A10, A12, A14, A16 of each aspherical surface that can be used in Example 1.

[0083] Table 2: Aspherical surface related values of the lenses of Example 1

[0084] Face number K A4 A6 A8 3 1.789E+00 2.127E-02 -3.355E-03 4.409E-04 4 2.694E+01 2.162E-02 -1.767E-03 -2.707E-04 5 -3.256E+00 1.878E-03 -1.218E-03 3.772E-04 6 -7.253E+00 -2.475E-03 3.648E-04 2.853E-05 7 -3.349E-01 -2.557E-03 5.679E-04 -4.369E-05 8 -4.044E+01 3.207E-04 -9.565E-07 1.522E-04 15 -3.899E+01 -1.159E-03 -7.641E-04 5.709E-05 16 2.286E+00 -5.121E-03 -3.336E-04 3.041E-05 Face number A10 A12 A14 A16 3 -4.116E-05 2.469E-06 -8.399E-08 1.225E-09 4 1.523E-04 -2.738E-05 2.355E-06 -8.073E-08 5 -7.026E-05 8.029E-06 -5.343E-07 1.452E-08 6 -1.422E-05 1.976E-06 -1.556E-07 5.284E-09 7 3.326E-06 -2.778E-07 2.149E-08 -6.807E-10 8 -4.687E-05 7.683E-06 -6.341E-07 2.113E-08 15 -1.395E-06 -1.877E-07 1.630E-08 -2.874E-10 16 -1.652E-06 2.469E-06 -8.399E-08 1.225E-09

[0085] Figure 2 The astigmatism and distortion curves of the optical imaging lens of Example 1 are shown. The astigmatism represents the meridional image surface curvature and the sagittal image surface curvature; the distortion represents the distortion size values corresponding to different image heights.

[0086] Figure 3 The MTF curve of the optical imaging lens of Example 1 is shown, which represents the MTF values ​​in the meridional and sagittal directions of different fields of view.

[0087] Depend on Figure 2 and Figure 3 It can be seen that the optical lens provided in Example 1 can achieve good imaging quality.

[0088] Specifically, as a preferred embodiment of the present invention but not limiting, Figure 4 FIG. 1 shows a schematic structural diagram of an optical imaging lens according to Example 2 of the present application. Figure 4 As shown, the first lens E1 has negative focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative focal power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has negative focal power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has positive focal power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has positive focal power, with its object-side surface S10 being convex and its image-side surface S11 being convex. The sixth lens E6 and the seventh lens E7 are a cemented lens. The sixth lens E6 has positive focal power, with its object-side surface S12 being convex and its image-side surface S13 being convex. The seventh lens E7 has negative focal power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The eighth lens E8 has positive refractive power, with a convex object-side surface S15 and a concave image-side surface S16. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from an object passes through surfaces S1 to S18 in sequence and is ultimately imaged on imaging surface S19.

[0089] Table 3 shows the surface type, curvature radius, thickness, and material of each lens of the optical imaging lens system of Example 2, where the units of curvature radius and thickness are both in millimeters (mm):

[0090] Table 3: Basic parameters of the optical system of Example 2

[0091] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 10.819 1.000 1.69,55.53 S2 spherical surface 4.252 2.569 S3 Aspheric -5.388 1.318 1.63,23.55 S4 Aspheric -38.606 1.366 S5 Aspheric -4.815 1.131 1.53,55.77 S6 Aspheric 101.433 0.100 S7 Aspheric 5.081 3.000 1.63,23.55 S8 Aspheric -62.736 0.156 STO spherical surface endless 0.090 S10 spherical surface 9.670 2.895 1.49,81.60 S11 spherical surface -5.738 0.207 S12 spherical surface 8.963 3.094 1.61,63.40 S13 spherical surface -3.899 0.600 1.80,25.47 S14 spherical surface 14.002 1.319 S15 Aspheric 6.940 1.984 1.53,55.77 S16 Aspheric 53.274 2.265 S17 spherical surface endless 0.800 1.51,64.19 S18 spherical surface endless 0.606 S19 spherical surface endless

[0092] In Table 3 above, any one of the object side and image side of the second lens E2, the third lens E3, and the fourth lens E4 to the eighth lens E8 is aspherical. The surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0093]

[0094] Where 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 aspheric vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface shape formula. Table 4 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 for various aspheric surfaces that can be used in Example 2.

[0095] Table 4: Aspheric surface related values ​​of the lens surface of Example 2

[0096] Face number K A4 A6 A8 3 5.733E-01 2.084E-02 -2.668E-03 3.300E-04 4 2.909E+01 2.430E-02 -1.623E-03 5.071E-05 5 -3.163E+00 8.018E-03 -3.640E-03 8.178E-04 6 9.000E+01 -8.804E-03 1.817E-03 -2.940E-04 7 -1.705E+00 -9.619E-03 3.189E-03 -6.516E-04 8 9.000E+01 1.734E-03 2.238E-05 2.645E-05 15 -4.036E+00 -4.659E-04 -5.790E-05 -1.767E-05 16 -4.685E+01 -4.122E-04 -2.397E-04 3.165E-05 Face number A10 A12 A14 A16 3 -3.035E-05 1.921E-06 -7.175E-08 1.203E-09 4 2.509E-05 -2.286E-06 -1.527E-07 3.828E-08 5 -1.098E-04 4.421E-06 6.997E-07 -7.495E-08 6 2.746E-05 -1.698E-06 6.029E-08 -1.752E-09 7 8.997E-05 -8.070E-06 4.172E-07 -9.425E-09 8 -5.030E-06 5.111E-07 -2.623E-08 3.858E-10 15 4.180E-06 -5.146E-07 3.062E-08 -6.234E-10 16 -4.749E-06 4.316E-07 -2.140E-08 4.818E-10

[0097] Figure 5 The astigmatism and distortion curves of the optical imaging lens of Example 2 are shown. Astigmatism represents meridional image curvature and sagittal image curvature; distortion represents the distortion magnitude corresponding to different image heights.

[0098] Figure 6 The MTF curve of the optical imaging lens of Example 2 is shown, which represents the MTF values ​​in the meridional and sagittal directions of different fields of view.

[0099] Depend on Figure 5 and Figure 6 It can be seen that the optical lens provided in Example 2 can achieve good imaging quality.

[0100] Specifically, as a preferred embodiment of the present invention but not limiting, Figure 7 FIG. 4 shows a schematic structural diagram of an optical imaging lens according to Example 3 of the present application. Figure 7 As shown, the first lens E1 has negative focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative focal power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has negative focal power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has positive focal power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has positive focal power, with its object-side surface S10 being convex and its image-side surface S11 being convex. The sixth lens E6 and the seventh lens E7 are a cemented lens. The sixth lens E6 has positive focal power, with its object-side surface S12 being convex and its image-side surface S13 being convex. The seventh lens E7 has negative focal power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The eighth lens E8 has positive refractive power, with a convex object-side surface S15 and a concave image-side surface S16. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from an object passes through surfaces S1 to S18 in sequence and is ultimately imaged on imaging surface S19.

[0101] Table 5 shows the surface type, radius of curvature, thickness and material of each lens of the optical imaging lens of Example 3, wherein the units of the radius of curvature and the thickness are millimeters (mm):

[0102] Table 5: Basic parameters of the optical system of Example 3

[0103] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 12.394 0.800 1.69,55.53 S2 spherical surface 4.455 3.055 S3 Aspheric -5.476 1.133 1.63,23.55 S4 Aspheric -30.806 1.546 S5 Aspheric -4.510 1.083 1.53,55.77 S6 Aspheric -153.333 0.100 S7 Aspheric 5.766 2.200 1.63,23.55 S8 Aspheric -29.478 0.534 STO spherical surface endless 0.100 S10 spherical surface 10.159 2.764 1.43,94.52 S11 spherical surface -5.960 0.148 S12 spherical surface 7.569 3.369 1.59,68.34 S13 spherical surface -4.253 0.600 1.84,23.78 S14 spherical surface 38.020 1.396 S15 Aspheric 7.360 2.481 1.53,55.77 S16 Aspheric 20.902 2.343 S17 spherical surface endless 0.800 1.51,64.19 S18 spherical surface endless 0.050 S19 spherical surface endless

[0104] In Table 5 above, any one of the second lens E2, the third lens E3, the fourth lens E4 to the eighth lens E8 has an object side surface and an image side surface which are aspherical surfaces, and the surface type of each aspherical surface can be defined by, but is 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 coefficient and the high order term coefficients A4, A6, A8, A10, A12, A14, A16 of each aspherical surface that can be used in Example 3.

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

[0108] Face number K A4 A6 A8 3 4.087E-01 2.035E-02 -2.571E-03 3.130E-04 4 8.865E+01 2.191E-02 -1.009E-03 -3.374E-04 5 -2.775E+00 6.185E-03 -2.878E-03 7.269E-04 6 -9.000E+01 -5.078E-03 7.772E-04 3.937E-05 7 -1.480E+00 -7.664E-03 2.111E-03 -3.538E-04 8 7.900E+01 1.404E-03 -1.860E-04 1.242E-04 15 -6.293E+00 -3.147E-04 -1.584E-04 -1.522E-06 16 1.804E+01 -6.294E-04 -2.669E-04 2.308E-05 Face number A10 A12 A14 A16 3 -2.824E-05 1.728E-06 -6.196E-08 9.811E-10 4 1.802E-04 -3.727E-05 3.944E-06 -1.646E-07 5 -1.221E-04 1.263E-05 -6.906E-07 8.593E-09 6 -3.717E-05 6.618E-06 -6.031E-07 2.282E-08 7 3.979E-05 -2.739E-06 8.534E-08 -1.037E-10 8 -3.260E-05 5.128E-06 -4.258E-07 1.450E-08 15 2.085E-06 -3.460E-07 2.406E-08 -5.605E-10 16 -2.224E-06 1.397E-07 -4.519E-09 7.144E-11

[0109] Figure 8 The astigmatism and distortion curves of the optical imaging lens of Example 3 are shown. The astigmatism represents the meridional image surface curvature and the sagittal image surface curvature; the distortion represents the distortion size value corresponding to different image heights.

[0110] Figure 9 The MTF curves of the optical imaging lens of Example 3 are shown, which represent the meridional and sagittal MTF values at different fields of view.

[0111] It can be seen from Figure 8 , 9 that the optical lens given in Example 3 can achieve good imaging quality.

[0112] In Examples 1-3, the basic data is shown in Table 7 below:

[0113] Table 7: Basic data of Examples 1-3

[0114] Basic data Example 1 Example 2 Example 3 R1 18.63 10.81 12.39 R2 5.26 4.25 4.45 f(mm) 3.67 3.63 3.49 f1(mm) -10.76 -10.67 -10.36 f2(mm) -9.80 -9.84 -10.49 f3(mm) -20.07 -8.52 -8.67 f4(mm) 11.45 7.40 7.65 f5(mm) 9.41 7.70 9.03 f6(mm) 6.04 4.82 5.12 f7(mm) -8.46 -3.69 -4.44 f8(mm) -120.97 14.63 19.87 FOV(°) 144.60 134.74 144.00 IhD 4.562 4.33 4.35 TTL(mm) 24.50 24.50 24.50 f / TTL*ImgH 0.03 0.03 0.03 Nd1 1.69 1.69 1.69 Nd2 1.63 1.63 1.63 Nd3 1.53 1.53 1.53 Nd4 1.63 1.63 1.63 Nd5 1.43 1.49 1.43 Nd6 1.59 1.61 1.59 Nd7 1.94 1.80 1.84 Nd8 1.53 1.53 1.53 Vd1 55.53 55.53 55.53 Vd2 23.55 23.55 23.55 Vd3 55.71 55.77 55.77 Vd4 23.55 23.55 23.55 Vd5 94.52 81.60 94.52 Vd6 68.34 63.40 68.34 Vd7 17.94 25.47 23.78 Vd8 55.71 55.77 55.77 FNO 1.65 1.80 1.65

[0115] In Examples 1-3, the conditional expressions are shown in Table 8 below:

[0116] Table 8: Conditional expressions of Examples 1-3

[0117] Conditional expression Example 1 Example 2 Example 3 (R1+R2) / R2 4.54 3.54 3.78 f1 / f -2.96 -2.94 -2.97 f2 / f -2.70 -2.71 -3.01 f3 / f -5.53 -2.35 -2.48 f4 / f 3.15 2.04 2.19 f5 / f 2.59 2.12 2.59 f6 / f 1.66 1.33 1.47 f7 / f -2.33 -1.02 -1.27 f8 / f -33.33 4.03 5.69 f / TTL*ImgH 0.03 0.03 0.03 Nd6 / Nd7 0.82 0.89 0.86 Vd6 / Vd7 3.81 2.48 2.87

[0118] A camera lens, the camera lens installs the high pixel day and night confocal optical system above inside, optical system mainly consists of 8 lenses, the number of lenses is reasonable, through reasonable distribution of lens power, optimization of lens aberration, improvement of resolving performance, has high pixel, large target surface 1 / 1.8 inch, large aperture and excellent resolving power, so that the lens will have greater competitiveness in the market.

[0119] 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, structure, etc. of the present application, or any technical deduction or replacement made under the premise of the concept of the present application, should be considered as the protection scope of the present application.

Claims

1. A high-pixel day and night confocal optical system, comprising, in order from the object plane to the image plane 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, characterized in that: The object side of the first lens is convex, the image side is concave, and its optical power is negative; The object side of the second lens is concave and its optical power is negative; The object side of the third lens is concave and its optical power is negative; The object side of the fourth lens is convex and its optical power is positive; The object side and image side of the fifth lens are both convex, and its optical power is positive; The object side and image side of the sixth lens are both convex, and its optical power is positive; The object side of the seventh lens is concave and its optical power is negative; The object side of the eighth lens is convex, and the image side is concave; Each lens of the optical system meets the following conditions: -3.50<f1 / f<-2.50; -2.90<f2 / f<-2.60; -5.50<f3 / f<-2.20; 1.90<f4 / f<3.40; 2.10<f5 / f<2.70; 1.20<f6 / f<1.80; -2.50<f7 / f<-0.90; -35.00<f8 / f<6.00; Among them, f is the focal length of the entire optical system, 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.

2. The high-pixel day and night confocal optical system according to claim 1, characterized in that: The curvature radius R1 of the object side of the first lens and the curvature radius R2 of the image side satisfy: 3.5<(R1+R2) / R2<4.

6.

3. The high-pixel day and night confocal optical system according to claim 1, characterized in that: The optical system meets the following conditions: 0.01mm<f / TTL*ImgH<0.04mm; Wherein, f is the effective focal length of the optical system, TTL is the on-axis distance from the object side of the first lens to the imaging surface, and ImgH is half the diagonal length of the effective pixel area on the imaging surface.

4. The high-pixel day and night confocal optical system according to any one of claims 1 to 3, characterized in that: The material refractive index Nd1 and the material Abbe number Vd1 of the first lens satisfy the following conditions: 1.60<Nd1<2.00, 50.00<Vd1<60.00; The refractive index Nd2 and Abbe number Vd2 of the material of the second lens satisfy the following conditions: 1.51<Nd2<1.72, 20.20<Vd2<25.00; The refractive index Nd3 and Abbe number Vd3 of the third lens element satisfy the following conditions: 1.45<Nd3<1.70, 50.00<Vd3<60.00; The material refractive index Nd4 and the material Abbe number Vd4 of the fourth lens satisfy the following conditions: 1.50<Nd4<1.70, 20.00<Vd4<30.00; The refractive index Nd5 and Abbe number Vd5 of the material of the fifth lens satisfy the following conditions: 1.40<Nd5<1.63, 80.00<Vd5<95.00; The refractive index Nd6 and Abbe number Vd6 of the sixth lens element satisfy the following conditions: 1.50<Nd6<1.75, 60.00<Vd6<70.00; The refractive index Nd7 and the Abbe number Vd7 of the seventh lens element satisfy the following conditions: 1.75<Nd7<1.95, 17.00<Vd7<28.00; The material refractive index Nd8 and the material Abbe number Vd8 of the eighth lens satisfy: 1.47<Nd8<1.65, 50.00<Vd8<60.

00.

5. The high-pixel day and night confocal optical system according to any one of claims 1 to 3, characterized in that: The first lens, the fifth lens, the sixth lens, and the seventh lens are spherical lenses, and the second lens, the third lens, the fourth lens, and the eighth lens are aspherical lenses.

6. The high-pixel day and night confocal optical system according to any one of claims 1 to 3, characterized in that: The total optical length TTL of the optical system satisfies: TTL≤25.6mm.

7. The high-pixel day and night confocal optical system according to any one of claims 1 to 3, characterized in that: The full field of view FOV of the optical system satisfies: 130°≤FOV≤150°.

8. The high-pixel day and night confocal optical system according to any one of claims 1 to 3, characterized in that: The refractive index Nd6 and Abbe number Vd6 of the sixth lens, and the refractive index Nd7 and Abbe number Vd7 of the seventh lens, satisfy: 0.80<Nd6 / Nd7< 1.15, 2.4<Vd6 / Vd7<4.

2.

9. The high-pixel day and night confocal optical system according to any one of claims 1 to 3, characterized in that: The aperture of the optical system is located between the fourth lens and the fifth lens.

10. A camera lens, characterized in that: The camera lens is equipped with the high-pixel day and night confocal optical system according to any one of claims 1 to 9.

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