Day and night confocal wide-angle optical system and application camera lens thereof

Abstract

The application discloses a day and night confocal wide-angle optical system and an application camera lens thereof, which is mainly composed of six lenses, the object plane side of the first lens is a convex surface, the image plane side is a concave surface, and the optical power is negative; the object plane side of the second lens is a convex surface, the image plane side is a concave surface, and the optical power is negative; the object plane side of the third lens is a convex surface, the image plane side is a concave surface, and the optical power is positive; the object plane side and the image plane side of the fourth lens are both convex surfaces, and the optical power is positive; the object plane side and the image plane side of the fifth lens are both concave surfaces, and the optical power is negative; the object plane side and the image plane side of the sixth lens are both convex surfaces, 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 resolving performance is improved, the lens has the characteristics of large wide angle, day and night confocal, light weight and excellent resolving power, and can be applied to intelligent doorbells, intelligent home systems and the like.

Description

Technical Field

[0001] The present application relates to the field of optical imaging, and in particular to a wide-angle optical system for use in a smart doorbell or smart home system and a camera lens thereof. Background Art

[0002] With the advancement of science and technology and social and economic development, camera lenses are widely used in smart doorbells or smart home systems. However, previous camera lenses or optical systems have defects such as complex structure, large size, small viewing angle, and poor day and night effects, which make it difficult to meet user needs. Summary of the Invention

[0003] In order to overcome the common problems of small viewing angle, large size and small amount of light entering existing optical systems, the present application provides a day and night confocal wide-angle optical system with a reasonable number of lenses and a simple structure. By reasonably allocating the optical focal length of the lenses, optimizing lens aberrations and improving the resolution performance, it has a large wide angle, large aperture, light weight and excellent resolution, making the miniaturized wide-angle lens more competitive in the fields of smart doorbells, smart homes, etc.

[0004] A day and night confocal wide-angle optical system, which is composed of a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, and a sixth lens in sequence from the object plane to the image plane along the optical axis;

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

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

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

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

[0009] The object side and image side of the fifth lens are both concave, and its optical power is negative;

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

[0011] As described above, the day and night confocal wide-angle optical system has lenses that meet the following conditions:

[0012] -6.50<f1 / f<-3.50;

[0013] -2.50<f2 / f<-1.50;

[0014] 2.70<f3 / f<5.50;

[0015] 1.80<f4 / f<3.00;

[0016] -3.15<f5 / f<-2.35;

[0017] 1.75<f6 / f<2.83;

[0018] 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, and f6 is the focal length of the sixth lens.

[0019] In the day / night confocal wide-angle optical system described above, the curvature radius R1 on the object side of the first lens and the curvature radius R2 on the image side satisfy: 3.6<(R1+R2) / R2<4.1.

[0020] The day and night confocal wide-angle optical system as described above satisfies the following conditions: 0.1<f / TTL*ImagH<0.3;

[0021] 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.

[0022] As described above, the day and night confocal wide-angle optical system has lenses that meet the following conditions:

[0023] 1.80<Nd1<2.00, 38.00<Vd1<40.00;

[0024] 1.51<Nd2<1.62, 54.20<Vd2<56.00;

[0025] 1.65<Nd3<1.70, 20.00<Vd3<30.00;

[0026] 1.50<Nd4<1.60, 65.00<Vd4<73.00;

[0027] 1.55<Nd5<1.73, 20.00<Vd5<30.00;

[0028] 1.47<Nd6<1.65, 50.00<Vd6<60.00;

[0029] Wherein, Nd1 is the refractive index of the first lens element, and Vd1 is the Abbe number of the first lens element; Nd2 is the refractive index of the second lens element, and Vd2 is the Abbe number of the second lens element; Nd3 is the refractive index of the third lens element, and Vd3 is the Abbe number of the third lens element; Nd4 is the refractive index of the fourth lens element, and Vd4 is the Abbe number of the fourth lens element; Nd5 is the refractive index of the fifth lens element, and Vd5 is the Abbe number of the fifth lens element; Nd6 is the refractive index of the sixth lens element, and Vd6 is the Abbe number of the sixth lens element.

[0030] In the day / night confocal wide-angle optical system described above, the first lens and the fourth lens are spherical lenses, and the second lens, the third lens, the fifth lens, and the sixth lens are aspherical lenses.

[0031] For the day and night confocal wide-angle optical system as described above, the total optical length TTL of the optical system satisfies: TTL≤13.4 mm.

[0032] As described above, the day and night confocal wide-angle optical system has a full field of view (FOV) that satisfies the following conditions: 150°≤FOV≤180°.

[0033] In the day / night confocal wide-angle optical system described above, the refractive index Nd4 and the Abbe number Vd4 of the fourth lens, and the refractive index Nd5 and the Abbe number Vd5 of the fifth lens, satisfy: 0.85<Nd4 / Nd5<1.35, 2.5<Vd4 / Vd5<3.6.

[0034] On the other hand, an embodiment of the present application further provides a day and night confocal wide-angle camera lens, which at least includes an optical lens, in which the above-mentioned day and night confocal wide-angle optical system is installed.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] The present invention provides a day and night confocal wide-angle optical system and a camera lens used therein. The system is mainly composed of six lenses, with a reasonable number of lenses and a simple structure. By rationally allocating the lens focal length, lens aberrations are optimized, and resolution performance is improved. The system has a wide angle, a large aperture, a light weight, and excellent resolution, making the miniaturized wide-angle lens more competitive in fields such as smart doorbells and smart homes. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments.

[0038] Figure 1 Schematic diagram of the structure of the optical system or camera lens in Example 1 of the present application;

[0039] Figure 2is a graph of field curvature and distortion of the optical system or camera lens in Example 1 of the present application;

[0040] Figure 3 is an MTF curve diagram of the optical system or camera lens of Example 1 of the present application;

[0041] Figure 4 2 is a schematic structural diagram of an optical system or camera lens according to embodiment 2 of the present application;

[0042] Figure 5 is a graph of field curvature and distortion of the optical system or camera lens according to Example 2 of the present application;

[0043] Figure 6 is an MTF curve diagram of the optical system or camera lens of Example 2 of the present application;

[0044] Figure 7 Schematic diagram of the structure of the optical system or camera lens in Example 3 of the present application;

[0045] Figure 8 3 is a graph showing the field curvature and distortion of the optical system or camera lens according to Example 3 of the present application;

[0046] Figure 9 This is the MTF curve diagram of the optical system or camera module of Example 3 of the present application. DETAILED DESCRIPTION

[0047] The present application provides a day and night confocal wide-angle optical system, which is composed of a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, and a sixth lens E6 in order from the object plane to the image plane along the optical axis;

[0048] The object side of the first lens E1 is convex, the image side is concave, and its optical power is negative;

[0049] The object side of the second lens E2 is convex, the image side is concave, and its optical power is negative;

[0050] The object side of the third lens E3 is convex, the image side is concave, and its optical power is positive;

[0051] The fourth lens element E4 has convex surfaces on both the object side and the image side, and has positive refractive power;

[0052] The object side and image side of the fifth lens E5 are both concave, and its optical power is negative;

[0053] The object side and image side of the sixth lens E6 are both convex, and its optical power is positive.

[0054] The optical system of the embodiment of the present application is mainly composed of 6 lenses. The number of lenses is reasonable and the structure is simple. By reasonably distributing the optical focal length of the lenses, optimizing lens aberrations and improving the resolution performance, it has a wide angle, a large aperture, a light weight and excellent resolution, making the miniaturized wide-angle lens more competitive in the market.

[0055] Furthermore, as a preferred embodiment of the present invention but not limiting, each lens of the optical system satisfies the following conditions:

[0056] -6.50<f1 / f<-3.50, by constraining the effective focal length ratio of the first lens E1 and the optical system to a reasonable range, the distortion of the system is controlled, and the imaging center has a higher angular resolution;

[0057] -2.50<f2 / f<-1.50; by constraining the effective focal length ratio of the second lens E2 to the optical system within a reasonable range, lens aberrations are optimized and imaging quality is improved;

[0058] 2.70<f3 / f<5.50; by constraining the effective focal length ratio of the third lens E3 to the optical 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;

[0059] 1.80<f4 / f<3.00; by reasonably controlling the ratio range of the fourth lens E4 and the effective focal length of the optical system, the imaging quality of the system is effectively improved;

[0060] -3.15<f5 / f<-2.35; by constraining the ratio of the fifth lens's E5 focal length to the effective focal length of the optical system to a reasonable range, the imaging quality is improved;

[0061] 1.75<f6 / f<2.83; By constraining the effective focal length ratio of the sixth lens element E6 to the optical system within a reasonable range, lens aberrations are optimized and analytical performance is improved;

[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, and f6 is the focal length of the sixth lens E6.

[0063] Furthermore, the refractive index Nd1 and Abbe number Vd1 of the first lens element E1 satisfy the following conditions: 1.80<Nd1<2.00, 38.00<Vd1<40.00. This design can effectively reduce chromatic aberration, optimize lens aberrations, and thereby effectively improve the imaging quality of the system.

[0064] Furthermore, the refractive index Nd2 and Abbe number Vd2 of the second lens element E2 satisfy the following conditions: 1.51<Nd2<1.62, 54.20<Vd2<56.00. This design can effectively reduce chromatic aberration, optimize lens aberrations, and thus effectively improve the imaging quality of the system.

[0065] Furthermore, the refractive index Nd3 and Abbe number Vd3 of the third lens element E3 satisfy the following conditions: 1.65<Nd3<1.70, 20.00<Vd3<30.00. This design can effectively reduce chromatic aberration, optimize lens aberrations, and thus effectively improve the imaging quality of the system.

[0066] Furthermore, the refractive index Nd4 and Abbe number Vd4 of the fourth lens element E4 satisfy the following conditions: 1.50<Nd4<1.60, 65.00<Vd4<73.00. This design can effectively reduce chromatic aberration, optimize lens aberrations, and thus effectively improve the imaging quality of the system.

[0067] Furthermore, the refractive index Nd5 and Abbe number Vd5 of the fifth lens element E5 satisfy the following conditions: 1.55<Nd5<1.73, 20.00<Vd5<30.00. This design can effectively reduce chromatic aberration, optimize lens aberrations, and thus effectively improve the imaging quality of the system.

[0068] Furthermore, the refractive index Nd6 and Abbe number Vd6 of the sixth lens element E6 satisfy the following conditions: 1.47<Nd6<1.65, 50.00<Vd6<60.00. This design can effectively reduce chromatic aberration, optimize lens aberrations, and thus effectively improve the imaging quality of the system.

[0069] Furthermore, as a preferred embodiment of the present invention but not limiting, the first lens element E1 and the fourth lens element E4 are spherical lenses, and the second lens element E2, the third lens element E3, the fifth lens element E5, and the sixth lens element E6 are aspherical lenses. By rationally distributing lens surface shapes, lens aberrations are optimized, and analytical performance is improved, resulting in a wide angle, a large aperture, a light weight, and excellent analytical power.

[0070] Furthermore, as a preferred embodiment of the present invention but not a limitation thereof, the curvature radius R1 on the object side and the curvature radius R2 on the image side of the first lens E1 satisfy the following relationship: 3.6<(R1+R2) / R2<4.1. By controlling the curvature radii on the object side and the image side of the first lens E1, the total deflection angles of the object side and the image side of the first lens E1 at the edge of the field of view can be reasonably controlled to be within a reasonable range, thereby effectively reducing the sensitivity of the system.

[0071] Furthermore, as a preferred embodiment of the present invention but not a limitation, the optical system satisfies the following conditions: 0.1<f / TTL*ImagH<0.3; 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 plane, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane. This design can reduce the total optical length, miniaturize the lens, and make the miniaturized wide-angle lens more competitive in the market.

[0072] Furthermore, as a preferred embodiment of the present invention but not a limitation, the total optical length TTL of the optical system satisfies: TTL≤13.4 mm. This design can increase the image circle while reducing the total optical length, effectively miniaturizing the lens.

[0073] Furthermore, as a preferred embodiment of the present invention but not a limitation, the full field of view FOV of the optical system satisfies: 150°<FOV<180°, has a simple structure, and a short total optical length, which is conducive to the application of miniaturized wide-angle lenses in the market.

[0074] Furthermore, as a preferred embodiment of the present invention but not a limitation thereof, the refractive index Nd4 and Abbe number Vd4 of the fourth lens element E4 and the refractive index Nd5 and Abbe number Vd5 of the fifth lens element E5 satisfy the following conditions: 0.85 < Nd4 / Nd5 < 1.35, and 2.5 < Vd4 / Vd5 < 3.6. This design increases the difference between the refractive index and Abbe number of the lenses, effectively reducing chromatic aberration.

[0075] Specifically, as a preferred embodiment of the present invention but not limiting, Figure 1 FIG. 1 shows a schematic structural diagram of an optical imaging lens according to Example 1 of the present application. Figure 1 As shown, the first lens E1 has negative focal power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative focal power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive focal power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens E4 has positive focal power, its object-side surface S8 is convex, and its image-side surface S9 is convex. The fifth lens E5 has negative focal power, its object-side surface S10 is concave, and its image-side surface S11 is concave. The sixth lens E6 has positive focal power, its object-side surface S12 is convex, and its image-side surface S13 is convex. The filter E7 has an object-side surface S14 and an image-side surface S15. Light from the object passes through each surface S1 to S15 in sequence and is ultimately imaged on the imaging surface S16.

[0076] Table 1 shows the surface type, curvature radius, thickness, and material of each lens of the optical imaging lens of Example 1, where the units of curvature radius and thickness are both millimeters (mm):

[0077] Table 1: Basic parameters of the optical system of Example 1

[0078] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 9.006 1.354 1.88，39.21 S2 spherical surface 3.019 1.894 S3 Aspheric 154.35 0.722 1.53，55.71 S4 Aspheric 1.19 1.040 S5 Aspheric 2.098 1.574 1.66，20.37 S6 Aspheric 5.006 0.413 STO spherical surface endless 0.080 S8 spherical surface 9.984 1.503 1.57，71.3 S9 spherical surface -2.002 0.050 S10 Aspheric 11.431 0.346 1.66，20.37 S11 Aspheric 1.818 0.040 S12 Aspheric 1.898 1.817 1.53，55.71 S13 Aspheric -2.8 0.100 S14 spherical surface endless 0.600 1.52，58.57 S15 spherical surface endless 1.867 S16 spherical surface endless

[0079] In Table 1 above, any one of the object side and image side of the second lens E2, the third lens E3, and the fifth lens E5 to the sixth lens E6 is aspherical. The surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0080]

[0081] 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 2 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, and A20 for various aspheric surfaces that can be used in Example 1.

[0082] Table 2: Aspheric surface related values ​​of the lens surface of Example 1

[0083] Face number K A4 A6 A8 A10 3 1.500E+01 3.248E-02 -3.083E-02 1.511E-02 -4.388E-03 4 -5.544E-01 1.748E-02 7.381E-02 -3.476E-01 5.514E-01 5 2.933E-01 2.778E-03 -1.510E-02 3.897E-02 -7.469E-02 6 -7.990E+00 4.704E-02 2.072E-02 -7.695E-02 1.350E-01 10 3.805E+01 -8.917E-02 1.120E-01 -2.300E-01 3.050E-01 11 -5.056E-03 -9.850E-02 7.931E-02 -1.800E-01 2.122E-01 12 -2.614E+00 1.442E-02 4.509E-03 -8.320E-02 1.243E-01 13 -1.664E-01 1.710E-02 -4.312E-02 8.546E-02 -9.894E-02 Face number A12 A14 A16 A18 A20 3 7.362E-04 -5.807E-05 -7.329E-07 4.514E-07 -2.228E-08 4 -4.810E-01 2.475E-01 -7.346E-02 1.131E-02 -6.514E-04 5 8.755E-02 -6.026E-02 2.361E-02 -4.744E-03 3.645E-04 6 -6.162E-02 0 0 0 0 10 -2.636E-01 1.465E-01 -4.952E-02 8.642E-03 -4.715E-04 11 -1.442E-01 5.924E-02 -1.481E-02 2.098E-03 -1.315E-04 12 -9.032E-02 3.822E-02 -9.631E-03 1.347E-03 -8.096E-05 13 7.141E-02 -3.227E-02 8.905E-03 -1.364E-03 8.809E-05

[0084] Figure 2 The astigmatism and distortion curves of the optical imaging lens of Example 1 are shown. Astigmatism represents meridional image curvature and sagittal image curvature; distortion represents the distortion magnitude corresponding to different image heights.

[0085] 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.

[0086] Depend on Figure 2 and Figure 3 It can be seen that the optical lens provided in Example 1 can achieve good imaging quality.

[0087] 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 4As shown, the first lens E1 has negative focal power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative focal power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive focal power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens E4 has positive focal power, its object-side surface S8 is convex, and its image-side surface S9 is convex. The fifth lens E5 has negative focal power, its object-side surface S10 is concave, and its image-side surface S11 is concave. The sixth lens E6 has positive focal power, its object-side surface S12 is convex, and its image-side surface S13 is convex. The filter E7 has an object-side surface S14 and an image-side surface S15. Light from the object passes through each surface S1 to S15 in sequence and is ultimately imaged on the imaging surface S16.

[0088] 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):

[0089] Table 3: Basic parameters of the optical system of Example 2

[0090] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 8.478 0.650 1.88，39.21 S2 spherical surface 2.976 1.595 S3 Aspheric 28.425 0.543 1.53，55.71 S4 Aspheric 1.086 0.960 S5 Aspheric 2.130 1.595 1.66，20.37 S6 Aspheric 4.838 0.363 STO spherical surface endless 0.080 S8 spherical surface 9.673 1.600 1.57，71.3 S9 spherical surface -1.648 0.050 S10 Aspheric 19.747 0.342 1.66，20.37 S11 Aspheric 1.807 0.040 S12 Aspheric 2.065 1.680 1.53，55.71 S13 Aspheric -2.108 0.100 S14 spherical surface endless 0.600 1.52，58.57 S15 spherical surface endless 1.634 S16 spherical surface endless

[0091] In Table 3 above, any one of the object side and image side of the second lens E2, the third lens E3, and the fifth lens E5 to the sixth lens E6 is aspherical. The surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0092]

[0093] 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, A16, and A20 for various aspheric surfaces that can be used in Example 2.

[0094] Table 4: Aspheric surface related values ​​of the lens surface of Example 2

[0095] Face number K A4 A6 A8 A10 3 4.880E+01 6.774E-02 -5.230E-02 2.110E-02 -5.172E-03 4 -6.113E-01 7.810E-02 8.505E-02 -4.528E-01 6.265E-01 5 4.401E-01 2.575E-02 -2.463E-02 4.656E-02 -6.877E-02 6 8.506E+00 6.348E-02 4.405E-02 -7.014E-02 1.810E-01 10 -3.668E+01 -1.163E-01 1.446E-01 -2.621E-01 3.278E-01 11 6.256E-03 -1.893E-01 1.639E-01 -2.114E-01 2.134E-01 12 -2.700E+00 -7.240E-02 6.593E-02 -9.795E-02 1.237E-01 13 -7.611E-01 2.503E-02 -5.241E-02 8.897E-02 -9.958E-02 Face number A12 A14 A16 A18 A20 3 7.528E-04 -5.266E-05 -7.230E-07 3.650E-07 -1.701E-08 4 -4.800E-01 2.243E-01 -6.342E-02 9.899E-03 -6.562E-04 5 7.879E-02 -5.847E-02 2.610E-02 -6.287E-03 6.211E-04 6 -6.162E-02 0 0 0 0 10 -2.715E-01 1.402E-01 -4.103E-02 5.166E-03 -2.408E-10 11 -1.405E-01 5.784E-02 -1.467E-02 2.122E-03 -1.364E-04 12 -8.982E-02 3.836E-02 -9.673E-03 1.342E-03 -7.935E-05 13 7.155E-02 -3.244E-02 8.957E-03 -1.357E-03 8.548E-05

[0096] 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.

[0097] 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.

[0098] By Figure 5 And Figure 6 It can be seen that the optical lens given in Embodiment 2 can achieve good imaging quality.

[0099] Specifically, as a preferred embodiment of the present application but not limited, Figure 7 The structural schematic diagram of the optical imaging lens according to Embodiment 3 of the present application is shown in FIG. 3. Figure 4 As shown in FIG. 3, the first lens E1 has negative focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface. The second lens E2 has negative focal power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface. The third lens E3 has positive focal power, the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface. The fourth lens E4 has positive focal power, the object side surface S8 is a convex surface, and the image side surface S9 is a convex surface. The fifth lens E5 has negative focal power, the object side surface S10 is a concave surface, and the image side surface S11 is a concave surface. The sixth lens E6 has positive focal power, the object side surface S12 is a convex surface, and the image side surface S13 is a convex surface. The filter E7 has an object side surface S14 and an image side surface S15. The light from the object sequentially passes through the surfaces S1 to S15 and is finally imaged on the imaging surface S16.

[0100] Table 5 shows the surface type, curvature radius, thickness and material of each lens of the optical imaging lens of Embodiment 3, wherein the units of the curvature radius and the thickness are millimeters (mm):

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

[0102] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 8.336 1.000 1.88，39.21 S2 spherical surface 2.999 2.079 S3 Aspheric 111.343 0.691 1.53，55.71 S4 Aspheric 1.150 1.126 S5 Aspheric 2.137 1.633 1.66，20.37 S6 Aspheric 4.140 0.497 STO spherical surface endless 0.166 S8 spherical surface 7.074 1.596 1.57，71.3 S9 spherical surface -1.762 0.050 S10 Aspheric 16.799 0.373 1.66，20.37 S11 Aspheric 1.813 0.040 S12 Aspheric 2.096 1.729 1.53，55.71 S13 Aspheric -2.432 0.100 S14 spherical surface endless 0.600 1.52，58.57 S15 spherical surface endless 1.717 S16 spherical surface endless

[0103] In Table 5 above, the object side surface and the image side surface of any one of the second lens E2, the third lens E3, the fifth lens E5 to the sixth lens E6 are aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0104]

[0105] 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 6 shows the conic coefficient and the high order term coefficients A4, A6, A8, A10, A12, A14, A16, A20 of each aspherical surface that can be used in Embodiment 3.

[0106] Table 6: Aspherical surface related values of the lens surface of Embodiment 3

[0107] Face number K A4 A6 A8 A10 3 9.800E+01 6.268E-02 -5.070E-02 2.104E-02 -5.210E-03 4 -6.243E-01 7.067E-02 3.867E-02 -3.545E-01 5.413E-01 5 4.048E-01 1.571E-02 -1.010E-02 2.519E-02 -5.456E-02 6 3.860E+00 5.885E-02 4.008E-02 -6.261E-02 1.454E-01 10 -1.603E+01 -1.231E-01 1.306E-01 -2.170E-01 2.826E-01 11 -7.775E-03 -2.144E-01 1.899E-01 -2.187E-01 2.125E-01 12 -2.502E+00 -8.468E-02 8.511E-02 -1.043E-01 1.240E-01 13 -6.316E-01 2.213E-02 -3.980E-02 7.316E-02 -8.841E-02 Face number A12 A14 A16 A18 A20 3 7.554E-04 -5.186E-05 -7.509E-07 3.463E-07 -1.548E-08 4 -4.470E-01 2.249E-01 -6.843E-02 1.151E-02 -8.205E-04 5 7.412E-02 -5.748E-02 2.559E-02 -6.102E-03 6.030E-04 6 -6.162E-02 0 0 0 0 10 -2.531E-01 1.345E-01 -3.325E-02 -4.852E-04 1.299E-03 11 -1.413E-01 5.882E-02 -1.481E-02 2.084E-03 -1.308E-04 12 -9.094E-02 3.896E-02 -9.594E-03 1.259E-03 -6.943E-05 13 6.755E-02 -3.226E-02 9.389E-03 -1.513E-03 1.024E-04

[0108] Figure 8 The astigmatism and distortion curves of the optical imaging lens of Example 3 are shown. Astigmatism represents meridional image curvature and sagittal image curvature; distortion represents the distortion magnitude corresponding to different image heights.

[0109] Figure 9 The MTF curve of the optical imaging lens of Example 3 is shown, which represents the MTF values ​​in the meridional and sagittal directions of different fields of view.

[0110] Depend on Figure 8 and Figure 9 It can be seen that the optical lens provided in Example 3 can achieve good imaging quality.

[0111] In Examples 1-3, the basic data are shown in Table 7 below:

[0112] Table 7 Basic data of Examples 1-3

[0113]

[0114]

[0115] A camera lens comprises at least an optical lens, in which the above-mentioned day and night confocal wide-angle optical system is installed.

[0116] Embodiments of the present invention provide a camera lens with a reasonable number of lenses and a simple structure. By rationally allocating lens power, lens aberrations are optimized, and resolution performance is improved. The lens has a wide angle, a large aperture, a light weight, and excellent resolution. This makes the miniaturized wide-angle lens more competitive in fields such as smart doorbells and smart homes.

[0117] The above descriptions are provided in conjunction with specific content to provide one or more embodiments, and the specific implementation of the present invention is not limited to these descriptions. Any similarity or similarity with the methods, structures, etc. of the present invention, or any technical deduction or substitution based on the concept of the present invention, shall be considered within the scope of protection of the present invention.

Claims

1. A day / night confocal wide-angle 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, an aperture, a fourth lens, a fifth lens, and a sixth 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 convex, the image side is concave, and its optical power is negative; The object side of the third lens is convex, the image side is concave, and its optical power is positive; The object side and image side of the fourth lens are both convex, and its optical power is positive; The object side and image side of the fifth lens are both concave, and its optical power is negative; The object side and image side of the sixth lens are both convex, and its optical power is positive; Each lens of the optical system meets the following conditions: -6.50<f1 / f<-3.50; -2.50<f2 / f<-1.50; 2.70<f3 / f<5.50; 1.80<f4 / f<3.00; -3.15<f5 / f<-2.35; 1.75<f6 / f<2.83; Wherein, f is the effective focal length of the 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, and f6 is the focal length of the sixth lens; The curvature radius R1 on the object side of the first lens and the curvature radius R2 on the image side satisfy: 3.6<(R1+R2) / R2<4.

1.

2. The wide-angle optical system according to claim 1, wherein: The optical system meets the following conditions: 0.1mm<f / TTL*ImgH<0.3mm; 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.

3. The day and night confocal wide-angle optical system according to any one of claims 1 to 2, characterized in that: Each lens of the optical system meets the following conditions: 1.80<Nd1<2.00, 38.00<Vd1<40.00; 1.51<Nd2<1.62, 54.20<Vd2<56.00; 1.65<Nd3<1.70, 20.00<Vd3<30.00; 1.50<Nd4<1.60, 65.00<Vd4<73.00; 1.55<Nd5<1.73, 20.00<Vd5<30.00; 1.47<Nd6<1.65, 50.00<Vd6<60.00; Wherein, Nd1 is the refractive index of the first lens element, and Vd1 is the Abbe number of the first lens element; Nd2 is the refractive index of the second lens element, and Vd2 is the Abbe number of the second lens element; Nd3 is the refractive index of the third lens element, and Vd3 is the Abbe number of the third lens element; Nd4 is the refractive index of the fourth lens element, and Vd4 is the Abbe number of the fourth lens element; Nd5 is the refractive index of the fifth lens element, and Vd5 is the Abbe number of the fifth lens element; Nd6 is the refractive index of the sixth lens element, and Vd6 is the Abbe number of the sixth lens element.

4. The day and night confocal wide-angle optical system according to any one of claims 1 to 2, characterized in that: The first lens and the fourth lens are spherical lenses, and the second lens, the third lens, the fifth lens, and the sixth lens are aspherical lenses.

5. The wide-angle optical system according to any one of claims 1 to 2, wherein: The total optical length TTL of the optical system satisfies: TTL≤13.4mm.

6. The day and night confocal wide-angle optical system according to any one of claims 1 to 2, characterized in that: The full field of view FOV of the optical system satisfies: 150°≤FOV≤180°.

7. The wide-angle optical system according to any one of claims 1 to 2, wherein: The refractive index Nd4 and the Abbe number Vd4 of the fourth lens, and the refractive index Nd5 and the Abbe number Vd5 of the fifth lens satisfy: 0.85<Nd4 / Nd5<1.35, 2.5<Vd4 / Vd5<3.

6.

8. A camera lens, comprising at least an optical lens, characterized in that: The day and night confocal wide-angle optical system according to any one of claims 1 to 7 is installed in the optical lens.

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