Large-aperture vehicle-mounted optical system and camera module applied by large-aperture vehicle-mounted optical system

Abstract

The large-aperture vehicle-mounted optical system is mainly composed of six lenses, the object plane side of the first lens is a convex surface, the image plane side of the first lens is a concave surface, and the focal power of the first lens is negative; the object plane side of the second lens is a convex surface or a concave surface, the image plane side is a concave surface, and the focal power is negative; the third lens has focal power; the fourth lens has focal power; the object plane side of the fifth lens is a convex surface or a concave surface, the image plane side is a concave surface, and the focal power is negative; the object plane side and the image plane side of the sixth lens are convex surfaces, and the focal power of the sixth lens is positive; the number of the lenses is reasonable, the structure is simple, the imaging quality of an optical system is improved by reasonably distributing the focal power of the lenses and optimizing the aberration of the lens, the characteristics of ultra-wide angle, large aperture and excellent temperature characteristic are considered, and the lens has huge potential in the market.

Description

Technical Field

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

[0002] In recent years, the automotive assisted driving system has developed rapidly, and the on-board optical lens plays an irreplaceable role as the eyes of the car to obtain external information. In order to meet higher imaging quality requirements and a larger visual range, it is necessary to reasonably match the lenses and use a larger aperture. However, most lenses on the market currently have shortcomings such as small aperture, low resolution, and low pixels. Summary of the invention

[0003] In order to overcome the common shortcomings of existing automotive optical lenses such as small aperture, low resolution and low pixels, the present application provides an optical system with large aperture, high-definition resolution, excellent temperature characteristics and ultra-high pixels, and a camera module applied thereto, which takes into account the characteristics of large aperture, high-definition resolution, excellent temperature characteristics and ultra-high pixels, and has great potential in the automotive field.

[0004] A large aperture vehicle-mounted optical system, which is composed of 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: 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 or concave, the image side is concave, and its optical power is negative; The third lens has optical power; The fourth lens has optical power; The object side of the fifth lens is convex or concave, the image side is concave, and its optical power is negative; The object side and the image side of the sixth lens are both convex surfaces, and its optical power is positive.

[0005] Preferably, each lens of the optical system satisfies the following conditions: -4.5 mm<f1<-3.5 mm; -3.2 mm<f2<-2.3 mm; -13.7 mm<f3<5.5 mm; 3.5 mm<f4<5.1 mm; -1.62 mm<f5<-0.97 mm; 0.96 mm<f6<1.65 mm; 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.

[0006] Preferably, each lens of the optical system satisfies the following conditions: Nd1>2.0,Vd1<30; Nd2<1.6,Vd2>53.2; Nd3>1.55,Vd3<25; Nd4>1.55,Vd4<62; Nd5>1.6,Vd5>23; Nd6<1.7,Vd6<65; Among them, Nd1 is the refractive index of the first lens, and Vd1 is the Abbe number of the first lens; Nd2 is the refractive index of the second lens, and Vd2 is the Abbe number of the second lens; Nd3 is the refractive index of the third lens, and Vd3 is the Abbe number of the third lens; Nd4 is the refractive index of the fourth lens, and Vd4 is the Abbe number of the fourth lens; Nd5 is the refractive index of the fifth lens, and Vd5 is the Abbe number of the fifth lens; Nd6 is the refractive index of the sixth lens, and Vd6 is the Abbe number of the sixth lens.

[0007] Preferably, the maximum angle CRA of the full-field chief ray of the optical system incident on the image plane satisfies: CRA <16°.

[0008] Preferably, the curvature radius R1 of the object surface side of the first lens satisfies: 10<R1<14.

[0009] Preferably, a curvature radius R1 of the object surface side of the fifth lens satisfies: R1 < 3.5.

[0010] Preferably, the total optical length TTL of the optical system satisfies: TTL ≤ 18 mm.

[0011] Preferably, the third lens is a glass or plastic lens.

[0012] Preferably, the F number of the optical system is: 1.4≤F number≤1.7 Preferably, the full field of view FOV of the optical system satisfies: 97.8°≤ FOV≤ 100°.

[0013] Preferably, the aperture stop is disposed between the fourth lens and the fifth lens.

[0014] Preferably, the fifth lens and the sixth lens are bonded together to form a combined lens.

[0015] On the other hand, an embodiment of the present application further provides a camera module, comprising at least an optical lens, wherein the optical lens is installed with the above-mentioned large aperture vehicle-mounted optical system.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a large-aperture vehicle-mounted optical system and a camera module applied thereto, which are mainly composed of 6 lenses, wherein the object surface side of the first lens is convex, the image surface side is concave, and the optical power thereof is negative; the object surface side of the second lens is convex or concave, the image surface side is concave, and the optical power thereof is negative; the third lens has optical power; the fourth lens has optical power; the object surface side of the fifth lens is convex or concave, the image surface side is concave, and the optical power thereof is negative; the object surface side and the image surface side of the sixth lens are both convex, and the optical power thereof is positive; the fifth lens and the sixth lens are bonded to each other to form a combined lens; the present invention has a reasonable number of lenses and a simple structure, and by reasonably allocating the optical power of the lenses, optimizes the lens aberrations, improves the imaging quality of the optical system, and takes into account the characteristics of ultra-wide angle, large aperture, and excellent temperature characteristics, and has great potential in the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for describing the embodiments are briefly introduced below.

[0018] Figure 1 It is a structural schematic diagram of the optical system or camera module of Example 1 of the present application; Figure 2 is an astigmatism and distortion curve diagram of the optical system or camera module of Example 1 of the present application; Figure 3 is an MTF curve diagram of the optical system or camera module of Example 1 of the present application; Figure 4 It is a structural schematic diagram of an optical system or a camera module according to Embodiment 2 of the present application; Figure 5 is an astigmatism and distortion curve diagram of the optical system or camera module of Example 2 of the present application; Figure 6 is an MTF curve diagram of the optical system or camera module of Example 2 of the present application; Figure 7 It is a structural schematic diagram of an optical system or a camera module according to Embodiment 3 of the present application; Figure 8 is an astigmatism and distortion curve diagram of the optical system or camera module of Example 3 of the present application; Fig. 9 It is an MTF curve diagram of the optical system or camera module of Example 3 of the present application. DETAILED DESCRIPTION

[0019] like Figure 1-9 As shown, the present application provides a vehicle-mounted optical system, which is composed of a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, an aperture 7, a fifth lens 5, a sixth lens 6, and an infrared filter 8 in sequence along the optical axis from the object plane to the image plane 8.

[0020] 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 or concave, the image side is concave, and its optical power is negative; The third lens has optical power; The fourth lens has optical power; The object side of the fifth lens is convex or concave, the image side is concave, and its optical power is negative; The object side and the 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.

[0021] The optical system and the like of the embodiment of the present invention are mainly composed of 6 lenses, 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 or concave, the image side is concave, and its optical power is negative; the third lens has optical power; the fourth lens has optical power; the object side of the fifth lens is convex or concave, the image side is concave, and its optical power is negative; the object and image sides of the sixth lens are both convex, and its optical power is positive; the fifth lens and the sixth lens are bonded to each other to form a combined lens; the application has a reasonable number of lenses and a simple structure, and by reasonably allocating the optical power of the lenses, optimizing the lens aberrations, improving the imaging quality of the optical system, and taking into account the characteristics of ultra-wide angle, large aperture, and excellent temperature characteristics, it has great potential in the market.

[0022] Further, as a preferred embodiment of the present invention but not limiting, each lens of the optical system satisfies the following conditions, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens: -4.5 mm<f1<-3.5 mm. This design can make the first lens 1 have a large negative focal length, which is beneficial to reducing the astigmatism and field curvature of the optical system; -3.2 mm<f2<-2.3 mm, by constraining the ratio of the focal power of the second lens 2 to the effective focal length of the optical imaging system within a reasonable range, the spherical aberration of the system is fine-tuned and controlled, thereby effectively improving the imaging quality of the system; -13.7mm<f3<5.5mm, by constraining the ratio of the focal power of the third lens 3 to the effective focal length of the optical imaging system within a reasonable range, the optical system has the advantages of ultra-wide angle, large aperture, small size and excellent temperature characteristics; 3.5mm<f4<5.1mm, by constraining the ratio of the focal power of the fourth lens 4 to the effective focal length of the optical imaging system within a reasonable range, the spherical aberration of the system is fine-tuned and controlled, thereby effectively improving the imaging quality of the system; -1.62mm<f5<-0.97mm, by constraining the ratio of the focal power of the fifth lens 5 to the effective focal length of the optical imaging system within a reasonable range, the optical system has the advantages of ultra-wide angle, large aperture, small size and excellent temperature characteristics; 0.96mm<f6<1.65mm, by constraining the ratio of the sixth lens 6 focal length to the effective focal length of the optical imaging system within a reasonable range, the configured vehicle-mounted surround view optical system has the advantages of ultra-wide angle, small aperture, large aperture and excellent temperature characteristics, compact structure, and easy processing and installation. At the same time, the configuration of the large aperture can increase the amount of light entering the optical system and higher imaging quality.

[0023] Furthermore, the refractive index Nd1 and the Abbe number Vd1 of the first lens 1 satisfy: Nd1>2.0, Vd1<30. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system. Furthermore, the refractive index Nd2 and the Abbe number Vd2 of the second lens 2 satisfy: Nd2<1.6, Vd2>53.2. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system. Furthermore, the refractive index Nd3 and the Abbe number Vd3 of the third lens 3 satisfy: Nd3>1.55, Vd3<25. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system. Furthermore, the refractive index Nd4 and the Abbe number Vd4 of the fourth lens 4 satisfy: Nd4>1.55, Vd4<62. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system. Furthermore, the refractive index Nd5 and the Abbe number Vd5 of the fifth lens 5 satisfy: Nd5>1.6, Vd5>23. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system. Furthermore, the refractive index Nd6 and the Abbe number Vd6 of the sixth lens 6 satisfy: Nd6<1.7, Vd6<65. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system.

[0024] Further, as a preferred embodiment of the present invention but not a limitation, the maximum angle CRA of the full-field chief light of the optical system incident on the image plane satisfies: CRA < 16°. 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.

[0025] Further, as a preferred embodiment of the present invention but not limitation, the curvature radius R1 of the object side of the first lens satisfies: 10 < R1 < 14. By controlling the object side of the first lens 1, the total deflection angle of the object side of the first lens 1 at the edge field of view can be reasonably controlled within a reasonable range.

[0026] Further, as a preferred embodiment of the present invention but not limitation, the curvature radius R1 of the object surface side of the fifth lens satisfies: R1 < 3.5, which can effectively improve the focus offset under high and low temperature conditions.

[0027] Further, as a preferred embodiment of the present invention but not a limitation, the total optical length TTL of the optical system satisfies: TTL ≤ 18 mm. This design can reduce the total optical length and effectively miniaturize the lens.

[0028] Further, as a preferred embodiment of the present invention but not limiting, the third lens is a glass or plastic lens, and this design can improve the performance of the system; Further, as a preferred embodiment of the present invention but not limiting, the F number and FOV of the optical system satisfy: 1.4≤F number≤1.7, 97.8°≤FOV≤100°, and the configuration of a large aperture can increase the amount of light entering the optical system and higher imaging quality, and the ultra-wide angle meets the needs of users; The refractive index Nd5 and Abbe number Vd5 of the fifth lens, as well as the refractive index Nd6 and Abbe number Vd6 of the sixth lens, satisfy: Nd5>1.6, Vd5>23; Nd6<1.7, Vd6<65; this design increases the difference between the refractive index and the Abbe number of the lens, which can effectively reduce chromatic aberration.

[0029] Specifically, as a preferred embodiment of the present invention but not limiting, Figure 1-3 As shown, in this embodiment 1, the focal length f1 of the first lens 1 is -4.22mm, the focal length f2 of the second lens 2 is -2.58mm, the focal length f3 of the third lens 3 is 3.88mm, the focal length f4 of the fourth lens 4 is 4.55mm, the focal length f5 of the fifth lens 5 is -1.08mm, the focal length f6 of the sixth lens 6 is 1.34mm, the total optical length TTL is 17.89mm, and the surface type, curvature radius, thickness and material parameters of each lens are shown in Table 1: Table 1: Basic parameters of the optical system of Example 1

[0030] In the above Table 1, 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; S10 and S11 correspond to the two surfaces of the fifth lens 5; S11 and S12 correspond to the two surfaces of the sixth lens 6; STO is the position of the aperture 7; S13 and S14 correspond to the two surfaces of the filter 8; IMA corresponds to the image plane 9.

[0031] Further, in Table 1, the object side and image side of any one of the second lens 2, the third lens 3, the fifth lens 5, and the sixth lens 6 are aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical formula:

[0032] 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 cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface shape formula. Table 2 shows the cone coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of each aspherical surface that can be used in Example 1.

[0033] Table 2: Aspheric surface related values ​​of the lens surface of Example 1

[0034] Figure 2 The astigmatism and distortion curves of the optical imaging lens of Example 1 are shown, where astigmatism represents the meridional image curvature and the sagittal image curvature, and distortion represents the distortion magnitude values ​​corresponding to different image heights; Figure 3 The MTF curve of the optical imaging lens of Example 1 is shown, which represents the MTF values ​​in the meridian direction and sagittal direction of different fields of view at different spatial frequencies. Figure 2 and Figure 3 It can be seen that the optical imaging system provided in Example 1 can achieve good imaging quality and has higher imaging quality.

[0035] Specifically, as a preferred embodiment of the present invention but not limiting, Figure 4-6As shown, in this embodiment 2, the focal length f1 of the first lens 1 is -3.85mm, the focal length f2 of the second lens 2 is -3.06mm, the focal length f3 of the third lens 3 is -13.3mm, the focal length f4 of the fourth lens 4 is 3.78mm, the focal length f5 of the fifth lens 5 is -1.16mm, the focal length f6 of the sixth lens 6 is 1.08mm, the total optical length TTL is 17.92mm, and the surface type, curvature radius, thickness and material parameters of each lens are shown in Table 3: Table 3: Basic parameters of the optical system of Example 2

[0036] In the above Table 3, 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; S10 and S11 correspond to the two surfaces of the fifth lens 5; S11 and S12 correspond to the two surfaces of the sixth lens 6; STO is the position of the aperture 7; S13 and S14 correspond to the two surfaces of the filter 8; IMA corresponds to the image plane 9.

[0037] Further, in Table 3, the object side surface and the image side surface of any one of the second lens 2, the third lens 3, the fifth lens 5, and the sixth lens 6 are aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0038] 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 cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface shape formula. Table 4 shows the cone coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of each aspherical surface that can be used in Example 2.

[0039] Table 4: Aspheric surface related values ​​of lens surface in Example 2

[0040] Figure 5 The astigmatism and distortion curves of the optical imaging lens of Example 2 are shown, where astigmatism represents the meridional image curvature and the sagittal image curvature, and distortion represents the distortion magnitude values ​​corresponding to different image heights; Figure 6 The MTF curve of the optical imaging lens of Example 2 is shown, which represents the MTF values ​​in the meridian direction and sagittal direction of different fields of view at different spatial frequencies. Figure 5 and Figure 6It can be seen that the optical imaging system provided in Example 2 can achieve good imaging quality and has higher imaging quality.

[0041] Specifically, as a preferred embodiment of the present invention but not limiting, Figure 7-9 As shown, in this embodiment 3, the focal length f1 of the first lens 1 is -3.99 mm, the focal length f2 of the second lens 2 is -2.91 mm, the focal length f3 of the third lens 3 is -11.78 mm, the focal length f4 of the fourth lens 4 is 3.84 mm, the focal length f5 of the fifth lens 5 is -1.34 mm, the focal length f6 of the sixth lens 6 is 1.18 mm, the total optical length TTL is 17.92 mm, and the surface type, curvature radius, thickness and material parameters of each lens are shown in Table 5: Table 5: Basic parameters of the optical system of Example 3

[0042] In the above Table 5, 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; S10 and S11 correspond to the two surfaces of the fifth lens 5; S11 and S12 correspond to the two surfaces of the sixth lens 6; STO is the position of the aperture 7; S13 and S14 correspond to the two surfaces of the filter 8; IMA corresponds to the image plane 9.

[0043] Further, in Table 5, the object side and image side of any one of the second lens 2, the third lens 3, the fifth lens 5, and the sixth lens 6 are aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical formula:

[0044] Wherein, x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the vertex of the aspheric surface, k is the cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface shape formula. Table 6 shows the cone coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of each aspheric surface that can be used in Example 3.

[0045] Table 6: Aspheric surface related values ​​of lens surface in Example 3

[0046] Figure 8The astigmatism and distortion curves of the optical imaging lens of Example 3 are shown, where astigmatism represents the meridional image curvature and the sagittal image curvature, and distortion represents the distortion magnitude values ​​corresponding to different image heights; Fig. 9 The MTF curve of the optical imaging lens of Example 3 is shown, which represents the MTF values ​​in the meridian direction and sagittal direction of different fields of view at different spatial frequencies. Figure 8 and Fig. 9 It can be seen that the optical imaging system provided in Example 3 can achieve good imaging quality and has higher imaging quality.

[0047] Further, in Examples 1-3, the basic data are as follows: Table 7: Basic data of Examples 1-3

[0048] A camera module includes at least an optical lens, in which the above-mentioned vehicle-mounted optical system is installed. The vehicle-mounted lens of the present application has the characteristics of ultra-wide angle, high-definition resolution, and excellent temperature characteristics, and is more competitive among lenses of the same type.

[0049] As described above, one or more implementation methods are provided in combination with specific contents, and the specific implementation of the present invention is not limited to these descriptions. Any similarity or similarity with the method, structure, etc. of the present invention, or any technical deduction or replacement based on the concept of the present invention, shall be regarded as the protection scope of the present invention.

Claims

1. A large aperture vehicle-mounted optical system, which is composed of 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, 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 or concave, the image side is concave, and its optical power is negative; The third lens has optical power; The fourth lens has optical power; The object side of the fifth lens is convex or concave, the image side is concave, and its optical power is negative; The object side and the image side of the sixth lens are both convex surfaces, 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: -4.5mm<f1<-3.5mm; -3.2 mm<f2<-2.3 mm; -13.7mm<f3<5.5mm; 3.5mm<f4<5.1mm; -1.62mm<f5<-0.97mm; 0.96mm<f6<1.65mm; 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 large aperture vehicle-mounted optical system according to claim 1, characterized in that: The curvature radius R1 of the object surface side of the first lens satisfies: 10<R1<14.

3. The large aperture vehicle-mounted optical system according to claim 1, characterized in that: The curvature radius R1 of the object surface side of the fifth lens satisfies: R1 < 3.

5.

4. The large aperture vehicle-mounted optical system according to any one of claims 1 to 3, characterized in that: Each lens of the optical system meets the following conditions: Nd1>2.0,Vd1<30; Nd2<1.6,Vd2>53.2; Nd3>1.55,Vd3<25; Nd4>1.55,Vd4<62; Nd5>1.6,Vd5>23; Nd6<1.7,Vd6<65; Among them, Nd1 is the refractive index of the first lens, and Vd1 is the Abbe number of the first lens; Nd2 is the refractive index of the second lens, and Vd2 is the Abbe number of the second lens; Nd3 is the refractive index of the third lens, and Vd3 is the Abbe number of the third lens; Nd4 is the refractive index of the fourth lens, and Vd4 is the Abbe number of the fourth lens; Nd5 is the refractive index of the fifth lens, and Vd5 is the Abbe number of the fifth lens; Nd6 is the refractive index of the sixth lens, and Vd6 is the Abbe number of the sixth lens.

5. The large aperture vehicle-mounted optical system according to any one of claims 1 to 3, characterized in that: The maximum angle CRA of the full-field chief ray incident on the image plane of the optical system satisfies: CRA < 16°.

6. The large aperture vehicle-mounted 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 ≤ 18 mm.

7. The large aperture vehicle-mounted optical system according to any one of claims 1 to 3, characterized in that: The third lens is a glass or plastic lens.

8. The large aperture vehicle-mounted optical system according to any one of claims 1 to 3, characterized in that: The F number of the optical system: 1.4 ≤ F number ≤ 1.7; and / or The full field of view FOV of the optical system satisfies: 97.8°≤ FOV≤ 100°.

9. The large aperture vehicle-mounted optical system according to any one of claims 1 to 3, characterized in that: The aperture is arranged between the fourth lens and the fifth lens.

10. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with a large aperture vehicle-mounted optical system as described in any one of claims 1 to 9.

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