Day and night confocal vehicle-mounted optical system and application camera module thereof

Abstract

The application discloses a day and night confocal vehicle-mounted optical system and an applied camera module, which are 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, the optical power is negative, the object plane side of the second lens is a concave surface, the image plane side is a convex surface, the optical power is positive, the object plane side of the third lens is a concave surface, the image plane side is a convex surface, the optical power is negative, the object plane side and the image plane side of the fourth lens are both convex surfaces, the optical power is positive, the object plane side of the fifth lens is a convex surface, the image plane side is a concave surface, the optical power is negative, the object plane side and the image plane side of the sixth lens are both convex surfaces, the optical power is positive, the number of lenses is reasonable, the structure is simple, the optical power of the lenses is reasonably distributed, the lens aberration is optimized, the imaging quality of the optical system is improved, the optical system has the characteristics of non-astigmatism at night, super wide angle, small caliber, large aperture and stable performance under temperature, and has stronger competitiveness in the same type of lens.

Description

Technical Field

[0001] The present application relates to the field of optical imaging, and in particular to a day and night confocal vehicle-mounted optical system and a camera module used therein. Background Art

[0002] In recent years, with the increasing popularity of intelligent driving, surround-view lenses have been increasingly used in various vehicles. However, the imaging effect of surround-view lenses is generally not ideal, especially in dark conditions such as at night, which makes it difficult to meet the requirements of use. In terms of appearance, many existing automotive lenses have problems with complex structure and large size. Providing miniaturized day and night confocal automotive lenses will be more competitive in the market. Summary of the Invention

[0003] In order to overcome the problems of poor performance and complex structure in existing optical systems or camera modules used in automotive lenses, the present application provides a day and night confocal automotive lens, which has the characteristics of no defocus at night, ultra-wide angle, small aperture, large aperture and stable performance under temperature. Among them, the large aperture configuration can increase the amount of light entering the optical system and higher imaging quality, making it more competitive among lenses of the same type.

[0004] A day and night confocal vehicle-mounted optical system, comprising a first lens, a second lens, a third lens, 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 concave, the image side is convex, and its optical power is positive;

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

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

[0009] The object side of the fifth lens is convex, the image side is 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] Preferably, each lens of the optical system meets the following conditions:

[0012] -5.9 <f1<-4.5;

[0013] 25 <f2<35;

[0014] -45 <f3<-25;

[0015] 5.3 <f4<7.7;

[0016] -7.9 <f5<-6.1;

[0017] 4.9 <f6<7.5;

[0018] Among them, 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] Preferably, each lens of the optical system meets the following conditions:

[0020] Nd1>1.61,Vd1<62;

[0021] Nd2>1.83,Vd2>20.1;

[0022] Nd3<1.63,Vd3>65;

[0023] Nd4>1.45,Vd4>50;

[0024] Nd5>1.6,Vd5<30;

[0025] Nd6<1.6,Vd6>65;

[0026] 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.

[0027] Preferably, the maximum angle CRA of the full-field chief ray of the optical system incident on the image plane satisfies: CRA<21°.

[0028] Preferably, the curvature radius R1 of the object surface side of the first lens satisfies: <R1<25。

[0029] Preferably, the total optical length TTL of the optical system satisfies: TTL ≤ 23 mm.

[0030] Preferably, the fourth lens is a glass aspherical lens.

[0031] Preferably, the F number and full field of view (FOV) of the optical system satisfy the following conditions: 1.8≤F number≤2.0, FOV≥140°.

[0032] Preferably, the fifth lens and the sixth lens are bonded together to form a combined lens.

[0033] On the other hand, an embodiment of the present application also provides a camera module, which includes at least an optical lens, and the above-mentioned day and night confocal vehicle-mounted optical system is installed in the optical lens.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] The present invention provides a day and night confocal vehicle-mounted optical system and a camera module applied thereto, which is mainly composed of 6 lenses, wherein the object side of the first lens is convex, the image side is concave, and the optical focal power is negative, the object side of the second lens is concave, the image side is convex, and the optical focal power is positive, the object side of the third lens is concave, the image side is convex, and the optical focal power is negative, the object side and the image side of the fourth lens are both convex, and the optical focal power is positive, the object side and the image side of the fifth lens are convex, the image side is concave, and the optical focal power is negative, and the object side and the image side of the sixth lens are both convex, and the optical focal power is positive. The number of lenses is reasonable, the structure is simple, and by reasonably allocating the optical focal power of the lenses, the lens aberrations are optimized, and the imaging quality of the optical system is improved, so that the optical system has the characteristics of no out-of-focus at night, ultra-wide angle, small aperture, large aperture, stable performance under temperature, etc., and has stronger competitiveness among lenses of the same type. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] 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.

[0037] Figure 1 Schematic diagram of the structure of the optical system or camera module of Example 1 of the present application;

[0038] Figure 2 1 is a graph showing astigmatism and distortion of the optical system or camera module according to Example 1 of the present application;

[0039] Figure 3 : is an MTF curve diagram of the optical system or camera module in Example 1 of the present application under visible light;

[0040] Figure 4 This is an MTF curve diagram of the optical system or camera module in Example 1 of the present application under infrared light;

[0041] Figure 5 2 is a schematic structural diagram of an optical system or camera module according to embodiment 2 of the present application;

[0042] Figure 6 is an astigmatism and distortion curve diagram of the optical system or camera module of Example 2 of the present application;

[0043] Figure 7is a MTF curve diagram of the optical system or camera module of Embodiment 2 of the present application under visible light;

[0044] Figure 8 is a MTF curve diagram of the optical system or camera module of Embodiment 2 of the present application under infrared light;

[0045] Figure 9 is a structural schematic diagram of the optical system or camera module of Embodiment 3 of the present application;

[0046] Figure 10 is a curve diagram of astigmatism and distortion of the optical system or camera module of Embodiment 3 of the present application;

[0047] Figure 11 is a MTF curve diagram of the optical system or camera module of Embodiment 3 of the present application under visible light;

[0048] Figure 12 is a MTF curve diagram of the optical system or camera module of Embodiment 3 of the present application under infrared light. DETAILED DESCRIPTION

[0049] As shown in Figures 1-12 The present application provides a vehicle-mounted relationship system, which is composed of a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, an aperture 5, a fifth lens 6, a sixth lens 7, and an infrared filter 8 in sequence from an object plane to an image plane 9 along an optical axis.

[0050] The object plane side of the first lens is convex, the image plane side is concave, and the optical power thereof is negative;

[0051] The object plane side of the second lens is concave, the image plane side is convex, and the optical power thereof is positive;

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

[0053] The object plane side and the image plane side of the fourth lens are both convex, and the optical power thereof is positive;

[0054] The object plane side of the fifth lens is convex, the image plane side is concave, and the optical power thereof is negative;

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

[0056] The optical system of the embodiment of the present application is mainly composed of 6 lenses. The object side of the first lens is convex, the image side is concave, and the optical focal power is negative. The object side of the second lens is concave, the image side is convex, and the optical focal power is positive. The object side of the third lens is concave, the image side is convex, and the optical focal power is negative. The object side and image side of the fourth lens are both convex, and the optical focal power is positive. The object side and image side of the fifth lens are convex, the image side is concave, and the optical focal power is negative. The object side and image side of the sixth lens are both convex, and the optical focal power is positive. The number of lenses is reasonable and the structure is simple. By reasonably allocating the optical power of the lenses, the lens aberrations are optimized, and the imaging quality of the optical system is improved. The lens has the characteristics of no defocus at night, ultra-wide angle, small aperture, large aperture, and stable performance under temperature, and has stronger competitiveness among lenses of the same type.

[0057] Furthermore, as a preferred embodiment of the present invention but not limiting, each lens of the optical system satisfies the following conditions: -5.9 <f1<-4.5,此设计可以使第一透镜1具有较大的负光焦度,有利于降低光学系统的像散和场曲;

[0058] Furthermore, as a preferred embodiment of the present invention but not limiting, each lens of the optical system satisfies the following conditions: <f2<35,通过约束第二透镜2的光焦度在合理的范围,对系统的球差进行微调和控制,进而有效的提升系统的成像质量。

[0059] Furthermore, as a preferred embodiment of the present invention but not limiting, each lens of the optical system satisfies the following conditions: -45 <f3<-25,通过约束第三透镜3的光焦度在合理的范围,使得光学系统具有大广角,大光圈,体积小,温度特性优秀的优势。

[0060] Furthermore, as a preferred embodiment of the present invention but not limiting, each lens of the optical system satisfies the following conditions: 5.3 <f4<7.7,通过约束第四透镜4的光焦度在合理的范围,对系统的球差进行微调和控制,进而有效的提升系统的成像质量。

[0061] Furthermore, as a preferred embodiment of the present invention but not limiting, each lens of the optical system satisfies the following conditions: -7.9 <f5<-6.1,通过约束第五透镜6的光焦度在合理的范围,使得配置的车载环视光学系统具有大广角,小口径,大光圈以温度特性优秀的优势,结构紧凑,便于加工和安装,同时,大光圈的配置可增加光学系统的进光量及更高的成像质量。

[0062] Furthermore, as a preferred embodiment of the present invention but not limiting, each lens of the optical system satisfies the following conditions: 4.9 <f6<7.5,通过约束第六透镜7的光焦度在合理的范围,对系统的球差、场曲进行微调和控制,进而有效的提升系统的成像质量。

[0063] Among them, 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 fifth lens.

[0064] Furthermore, the refractive index Nd1 and the Abbe number Vd1 of the first lens 1 satisfy: Nd1>1.61, Vd1<62. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system.

[0065] Furthermore, the refractive index Nd2 and Abbe number Vd2 of the second lens 2 satisfy: Nd2>1.83, Vd2>20.1. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system.

[0066] Furthermore, the refractive index Nd3 and the Abbe number Vd3 of the third lens 3 satisfy: Nd3<1.63, Vd3>65. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system.

[0067] Furthermore, the refractive index Nd4 and the Abbe number Vd4 of the fourth lens element 4 satisfy: Nd4>1.45, Vd4>50. This design can effectively reduce chromatic aberration, optimize lens aberration, and thereby effectively improve the imaging quality of the system.

[0068] Furthermore, the refractive index Nd5 and Abbe number Vd5 of the fifth lens element 6 satisfy the following conditions: Nd5>1.6, Vd5<30. This design can effectively reduce chromatic aberration, optimize lens aberration, and thereby effectively improve the imaging quality of the system.

[0069] Furthermore, the refractive index Nd6 and the Abbe number Vd6 of the sixth lens element 7 satisfy the following conditions: Nd6<1.6, Vd6>65. This design can effectively reduce chromatic aberration, optimize lens aberration, and thereby effectively improve the imaging quality of the system.

[0070] Furthermore, as a preferred embodiment of the present invention but not a limitation thereof, the maximum angle CRA of the full-field chief ray incident on the image plane of the optical system satisfies: CRA<21°. This design can make the CRA of the lens more consistent with the CRA of the chip, thereby improving the photosensitivity efficiency of the chip.

[0071] Further, as a preferred embodiment of the present application but not limited, the curvature radius R1 of the first lens satisfies: 0 < R1 < 25, by controlling the first lens 1, the total deflection angle of the first lens 1 at the edge field can be reasonably controlled within a reasonable range.

[0072] Further, as a preferred embodiment of the present application but not limited, the total optical length TTL of the optical system satisfies: TTL ≤ 23mm, this design can reduce the total optical length, which can effectively miniaturize the lens.

[0073] Further, as a preferred embodiment of the present application but not limited, the fourth lens is a glass aspherical lens, which is used for aberration correction.

[0074] Further, as a preferred embodiment of the present application but not limited, the F number and FOV of the optical system satisfy: 1.8 ≤ F number ≤ 2.0, FOV ≥ 140°, the large aperture configuration can increase the light quantity of the optical system and the imaging quality, and the super wide angle satisfies the user's use requirement.

[0075] Further, as a preferred embodiment of the present application but not limited, the fifth lens and the sixth lens are adhered to each other to form a combined lens; the refractive index Nd5, the Abbe number Vd5 of the fifth lens, and the refractive index Nd6, the Abbe number Vd6 of the sixth lens satisfy: Nd5 > 1.6, Vd5 < 30; Nd6 < 1.6, Vd6 > 65; this design increases the difference between the refractive index and the Abbe number of the lens, which can effectively reduce the chromatic aberration.

[0076] Specifically, as a preferred embodiment of the present application but not limited, as shown in Figures 1-3 Table 1, in the embodiment 1, the focal length f1 of the first lens 1 is -5.698mm, the focal length f2 of the second lens 2 is 30.819mm, the focal length f3 of the third lens 3 is -29.237mm, the focal length f4 of the fourth lens 4 is 6.893mm, the focal length f5 of the fifth lens 6 is -6.445mm, the focal length f6 of the sixth lens 7 is 5.294mm, and the total optical length TTL is 22.596mm, the surface type, the curvature radius, the thickness and the material parameters of each lens are shown in Table 1:

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

[0078]

[0079] In Table 1 above, along the optical axis from the object plane to the image plane 9, OBJ is the object plane; S1 and S2 correspond to the two surfaces of the first lens 1; S3 and S4 correspond to the two surfaces of the second lens 2; S5 and S6 correspond to the two surfaces of the third lens 3; S7 and S8 correspond to the two surfaces of the fourth lens 4; STO is the position of the aperture 5; S10 and S11 correspond to the two surfaces of the fifth lens 6; S11 and S12 correspond to the two surfaces of the sixth lens 7; S13 and S14 correspond to the two surfaces of the filter 8; and IMA corresponds to the image plane 9.

[0080] Furthermore, in Table 1, any one of the object side and image side surfaces of the fourth lens 4 is aspherical, and the surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0081]

[0082] 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, and A16 for various aspheric surfaces that can be used in Example 1.

[0083] Table 2: Aspheric surface related values ​​of the lens surface of Example 1

[0084]

[0085] 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, and distortion represents the distortion magnitude corresponding to different image heights. Figure 3 and Figure 4 The MTF curves of the optical imaging lens of Example 1 under visible and infrared light are shown respectively, which represent the MTF values ​​in the meridian and sagittal directions of different fields of view at different spatial frequencies. Figure 2 、 Figure 3 and Figure 4 It can be seen that the optical imaging system provided in Example 1 can achieve good imaging quality and has higher imaging quality.

[0086] Specifically, as a preferred embodiment of the present invention but not limiting, Figures 1-3As shown, in this embodiment 2, the focal length f1 of the first lens 1 is -5.558 mm, the focal length f2 of the second lens 2 is 28.189 mm, the focal length f3 of the third lens 3 is -41.587 mm, the focal length f4 of the fourth lens 4 is 7.506 mm, the focal length f5 of the fifth lens 6 is -7.788 mm, the focal length f6 of the sixth lens 7 is 6.158 mm, and the total optical length TTL is 22.599 mm. The surface type, curvature radius, thickness and material parameters of each lens are shown in Table 3:

[0087] Table 3: Basic parameters of the optical system of Example 2

[0088]

[0089] In Table 3 above, along the optical axis from the object plane to the image plane 9, OBJ is the object plane; S1 and S2 correspond to the two surfaces of the first lens 1; S3 and S4 correspond to the two surfaces of the second lens 2; S5 and S6 correspond to the two surfaces of the third lens 3; S7 and S8 correspond to the two surfaces of the fourth lens 4; STO is the position of the aperture 5; S10 and S11 correspond to the two surfaces of the fifth lens 6; S11 and S12 correspond to the two surfaces of the sixth lens 7; S13 and S14 correspond to the two surfaces of the filter 8; and IMA corresponds to the image plane 9.

[0090] Furthermore, in Table 3, any one of the object side and image side surfaces of the fourth lens 4 is aspherical, and the surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0091]

[0092] 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.

[0093] Table 4: Aspheric surface related values ​​of the lens surface of Example 2

[0094]

[0095] Figure 6 The astigmatism and distortion curves of the optical imaging lens of Example 2 are shown. Astigmatism represents meridional image curvature and sagittal image curvature, and distortion represents the distortion magnitude corresponding to different image heights. Figure 7 and Figure 8The MTF curves of the optical imaging lens of embodiment 2 under visible and infrared light are shown respectively, which represent the MTF values of different spatial frequencies, different field of view meridian direction and sagittal direction, as shown in Figure 6 , Figure 7 and Figure 8 It can be seen that the optical imaging system given by embodiment 2 can achieve good imaging quality and has higher imaging quality.

[0096] Specifically, as a preferred embodiment of the present application but not limited, as shown in Figures 1-3 , in the present embodiment 3, the focal length f1 of the first lens 1 is -5.66mm, the focal length f2 of the second lens 2 is 26.941mm, the focal length f3 of the third lens 3 is -29.56mm, the focal length f4 of the fourth lens 4 is 7.462mm, the focal length f5 of the fifth lens 6 is -7.004mm, the focal length f6 of the sixth lens 7 is 5.467mm, the total optical length TTL is 22.597mm, and the surface type, curvature radius, thickness and material parameters of each lens are shown in Table 5:

[0097] Table 5: Basic parameters of the optical system of embodiment 3

[0098]

[0099] In Table 5 above, along the optical axis from the object plane to the image plane 9, OBJ is the object plane; S1 and S2 correspond to the two surfaces of the first lens 1; S3 and S4 correspond to the two surfaces of the second lens 2; S5 and S6 correspond to the two surfaces of the third lens 3; S7 and S8 correspond to the two surfaces of the fourth lens 4; STO is the position of the stop 5; S10 and S11 correspond to the two surfaces of the fifth lens 6; S11 and S12 correspond to the two surfaces of the sixth lens 7; S13 and S14 correspond to the two surfaces of the filter 8; and IMA corresponds to the image plane 9.

[0100] Further, any one of the object side and the image side of the fourth lens 4 is aspherical, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0101]

[0102] 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 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 gives the conic coefficients and high order term coefficients A4, A6, A8, A10, A12, A14, A16 of each aspherical surface that can be used in embodiment 3.

[0103] Table 6: Aspheric surface related values ​​of the lens surface of Example 3

[0104]

[0105] Figure 10 The astigmatism and distortion curves of the optical imaging lens of Example 3 are shown. Astigmatism represents meridional image curvature and sagittal image curvature, and distortion represents the distortion magnitude corresponding to different image heights. Figure 11 and Figure 12 The MTF curves of the optical imaging lens of Example 3 under visible and infrared light are shown respectively, which represent the MTF values ​​in the meridian and sagittal directions of different fields of view at different spatial frequencies. Figure 10 、 Figure 11 and Figure 12 It can be seen that the optical imaging system provided in Example 3 can achieve good imaging quality and has higher imaging quality.

[0106] Furthermore, in Examples 1-3, the basic data are as follows:

[0107] Table 7: Basic data of Examples 1-3

[0108]

[0109] A camera module includes at least an optical lens, in which the above-mentioned vehicle-mounted day and night confocal optical system is installed. The day and night confocal vehicle-mounted optical system of the present invention has the characteristics of ultra-wide angle, small aperture, large aperture and stable performance under temperature, and is more competitive among lenses of the same type.

[0110] 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 vehicle-mounted 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, 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 concave, the image side is convex, and its optical power is positive; The object side of the third lens is concave, the image side is convex, and its optical power is negative; The object side and image side of the fourth lens are both convex, and its optical power is positive; The object side of the fifth lens is convex, the image side is 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; The fifth lens and the sixth lens are bonded together to form a combined lens; Each lens of the optical system meets the following conditions: -5.9mm <f1<-4.5mm; 25mm <f2<35mm; -45mm <f3<-25mm; 5.3mm <f4<7.7mm; -7.9mm <f5<-6.1mm; 4.9mm <f6<7.5mm; Among them, 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.

2. The day and night confocal vehicle-mounted optical system according to claim 1, characterized in that: Each lens of the optical system meets the following conditions: Nd1>1.61,Vd1<62; Nd2>1.83,Vd2>20.1; Nd3<1.63,Vd3>65; Nd4>1.45,Vd4>50; Nd5>1.6,Vd5<30; Nd6<1.6,Vd6>65; 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.

3. The day and night confocal vehicle-mounted optical system according to claim 1, wherein: The maximum angle CRA of the full-field chief ray incident on the image plane of this optical system satisfies: CRA < 21°.

4. The day and night confocal vehicle-mounted optical system according to claim 1, wherein: The curvature radius R1 of the object surface side of the first lens satisfies: 0mm<R1<25mm.

5. The day and night confocal vehicle-mounted optical system according to claim 1, wherein: The total optical length TTL of the optical system satisfies: TTL ≤ 23 mm.

6. The day and night confocal vehicle-mounted optical system according to claim 1, characterized in that: The fourth lens is a glass aspherical lens.

7. The day and night confocal vehicle-mounted optical system according to claim 1, wherein: The F number and full field of view (FOV) of the optical system meet the following requirements: 1.8≤F number≤2.0, FOV ≥ 140°.

8. The day and night confocal vehicle-mounted optical system according to claim 1, characterized in that :The aperture of this optical system is located between the fourth lens and the fifth lens.

9. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with the day and night confocal vehicle-mounted optical system according to any one of claims 1 to 8.

Images