A long-focus, low-distortion vehicle-mounted optical system and a camera module using the same

Abstract

The present invention provides a long-focus, low-distortion vehicle-mounted optical system and a camera module used therein. The optical system is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in sequence along the optical axis from the object plane to the image plane. By rationally allocating the surface shape and optical power of each lens, lens aberrations are optimized and lens resolution is improved. At the same time, the excellent temperature characteristics and large aperture characteristics are taken into account to meet the requirements of high pixel usage. The optical system has great potential for application in the field of vehicle-mounted forward vision.

Description

Technical Field

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

[0002] In recent years, automotive driver-assistance systems have developed rapidly, and automotive optical lenses, acting as the eyes through which vehicles obtain external information, have played an irreplaceable role. However, most existing lenses on the market suffer from drawbacks such as high distortion, low resolution, and small aperture, making them difficult to meet user needs. Summary of the Invention

[0003] In order to overcome the technical problems of large distortion, low resolution and small aperture of existing automotive optical lenses, the present application provides a long-focus, low-distortion automotive optical system. By rationally allocating the surface shape and optical focal length of each lens, it optimizes lens aberrations and improves lens resolution. At the same time, it takes into account the characteristics of excellent temperature characteristics and large aperture, meets the use of high pixels, and has great potential for application in the field of automotive forward-looking vision.

[0004] A long-focus, low-distortion 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;

[0005] The first lens has positive optical power and its object side surface is convex;

[0006] The second lens has negative optical power, its object-side surface is concave, and its image-side surface is concave;

[0007] The third lens has positive refractive power, its object side surface is concave, and its image side surface is convex;

[0008] The fourth lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex;

[0009] The fifth lens has positive optical power and its object-side surface is convex;

[0010] The sixth lens has negative optical power and its object-side surface is concave;

[0011] The optical system satisfies the following relationship: 2.00<f / TTL*ImgH<3.50;

[0012] Wherein, f is the effective focal length of the optical system, TTL is the distance from the center of the object side surface of the first lens to the imaging plane of the optical system on the optical axis, and ImgH is half the horizontal length of the effective pixel area on the imaging plane.

[0013] Preferably, the optical system meets the following conditions:

[0014] 15.0mm<f1<25.0mm;

[0015] -20.0mm<f2<-5.0mm;

[0016] 40.0mm<f3<60.0mm;

[0017] 10.0mm<f4<25.0mm;

[0018] 10.0mm<f5<30.0mm;

[0019] -20.0mm<f6<-5.0mm;

[0020] 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.

[0021] Preferably, the optical system meets the following conditions:

[0022] 1.0<f1 / f<3.0;

[0023] -5.0<f2 / f<-0.5;

[0024] 2.0<f3 / f<4.0;

[0025] 1.0<f4 / f<6.0;

[0026] 1.0<f5 / f<8.0;

[0027] -2.0<f6 / f<-0.5;

[0028] 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.

[0029] Preferably, the refractive index Nd1 and the Abbe number Vd1 of the material of the first lens satisfy: 1.80<Nd1<2.05, 25.00<Vd1<55.00;

[0030] The material refractive index Nd2 and the material Abbe number Vd2 of the second lens satisfy the following conditions: 1.65<Nd2<2.00, 17.00<Vd2<50.00;

[0031] The material refractive index Nd3 and the material Abbe number Vd3 of the third lens satisfy the following conditions: 1.43<Nd3<2.00, 50.00<Vd3<95.00;

[0032] The material refractive index Nd4 and the material Abbe number Vd4 of the fourth lens satisfy the following conditions: 1.43<Nd4<2.00, 50.00<Vd4<95.00;

[0033] The refractive index Nd5 and Abbe number Vd5 of the material of the fifth lens satisfy the following conditions: 1.43<Nd5<2.00, 50.00<Vd5<95.00;

[0034] The material refractive index Nd6 and the material Abbe number Vd6 of the sixth lens satisfy: 1.65<Nd6<2.00, 17.00<Vd6<50.00.

[0035] Preferably, the full field of view (FOV) of the optical system satisfies: 20.00°<FOV<40.00°.

[0036] Preferably, a curvature radius R21 of the object-side surface and a curvature radius R22 of the image-side surface of the second lens satisfy the following relationship: 0.15<(R21+R22) / R22<2.0.

[0037] Preferably, a curvature radius R31 of the object-side surface and a curvature radius R32 of the image-side surface of the third lens satisfy the following relationship: R31 / R32>1.0.

[0038] Preferably, a curvature radius R41 of the object-side surface and a curvature radius R42 of the image-side surface of the fourth lens satisfy the following relationship: R41 / R42>0.4.

[0039] On the other hand, an embodiment of the present application also provides a camera module, which includes at least an optical lens, in which the above-mentioned long-focus, low-distortion vehicle-mounted optical system is installed.

[0040] Compared with the prior art, the present invention has the following advantages:

[0041] The present invention provides a long-focus, low-distortion vehicle-mounted optical system and a camera module used therein. The optical system is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in sequence along the optical axis from the object plane to the image plane. By rationally allocating the surface shape and optical power of each lens, lens aberrations are optimized and lens resolution is improved. At the same time, the excellent temperature characteristics and large aperture characteristics are taken into account to meet the requirements of high pixel usage. The optical system has great potential for application in the field of vehicle-mounted forward vision. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] 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.

[0043] Figure 1 Schematic diagram of the structure of the optical system or camera module of Example 1 of the present application;

[0044] Figure 2 is the MTF curve of the optical system or camera module of Example 1 of the present application;

[0045] Figure 3 is the astigmatism and distortion curve of the optical system or camera module of Example 1 of the present application;

[0046] Figure 4 2 is a schematic structural diagram of an optical system or camera module according to embodiment 2 of the present application;

[0047] Figure 5 is the MTF curve of the optical system or camera module of Example 2 of the present application;

[0048] Figure 6 It is the astigmatism and distortion curve of the optical system or camera module of Example 2 of the present application. DETAILED DESCRIPTION

[0049] like Figure 1-6 As shown, a long-focus, low-distortion vehicle-mounted optical system is composed of a first lens E1, a second lens E2, a third lens E3, 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;

[0050] The first lens E1 has positive refractive power and its object-side surface is convex;

[0051] The second lens E2 has negative refractive power, its object-side surface is concave, and its image-side surface is concave;

[0052] The third lens E3 has positive refractive power, its object-side surface is concave, and its image-side surface is convex;

[0053] The fourth lens E4 has positive refractive power, its object-side surface is convex, and its image-side surface is convex;

[0054] The fifth lens element E5 has positive refractive power and a convex object-side surface.

[0055] The sixth lens element E6 has negative refractive power, and its object-side surface is concave.

[0056] The embodiments of the present application provide a long-focus, low-distortion automotive optical system. The optical system comprises, in order from the object plane to the image plane along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. By rationally allocating the surface shape and optical power of each lens, lens aberrations are optimized and lens resolving power is improved. While also taking into account excellent temperature characteristics and a large aperture, the system meets the requirements for high pixel count. The system has great potential for application in the automotive forward-view field.

[0057] Furthermore, the optical system satisfies the following relationship: 2.00<f / TTL*ImgH<3.50;

[0058] Wherein, f is the effective focal length of the optical system, TTL is the distance from the center of the object-side surface of the first lens element E1 to the imaging plane of the optical system on the optical axis, and ImgH is half the horizontal length of the effective pixel area on the imaging plane. This relationship reflects the constraints of the optical lens in terms of field of view angle and thinness. When the above relationship is satisfied, the requirements for thinness of the optical lens can be met while satisfying the requirements for thinness of the optical lens.

[0059] Furthermore, the optical system satisfies the following conditions: 15.0mm<f1<25.0mm; -20.0mm<f2<-5.0mm; 40.0mm<f3<60.0mm; 10.0mm<f4<25.0mm; 10.0mm<f5<30.0mm; -20.0mm<f6<-5.0mm; wherein f1 is the focal length of the first lens element E1, f2 is the focal length of the second lens element E2, f3 is the focal length of the third lens element E3, f4 is the focal length of the fourth lens element E4, f5 is the focal length of the fifth lens element E5, and f6 is the focal length of the sixth lens element E6. By reasonably allocating the focal lengths of the various lenses, the optical system has the characteristics of telephoto and low distortion, while taking into account the advantages of high resolution, excellent temperature characteristics, and large aperture.

[0060] Furthermore, 1.0<f1 / f<3.0, 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, so that the imaging center has a higher angular resolution;

[0061] -5.0<f2 / f<-0.5, by constraining the effective focal length ratio of the second lens E2 and the optical system to a reasonable range, lens aberrations are optimized and imaging quality is improved;

[0062] 2.0<f3 / f<4.0, 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;

[0063] 1.0<f4 / f<6.0, 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;

[0064] 1.0<f5 / f<8.0, by constraining the ratio of the fifth lens's E5 focal power to the effective focal length of the optical system to a reasonable range, improving image quality;

[0065] -2.0<f6 / f<0.5, by constraining the effective focal length ratio of the sixth lens E6 and the optical system to a reasonable range, lens aberrations are optimized and analytical performance is improved;

[0066] Wherein, f is the effective focal length of the 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.

[0067] Furthermore, the material refractive index Nd1 and the material Abbe number constant Vd1 of the first lens E1 satisfy the following conditions: 1.80<Nd1<2.05, 25.00<Vd1<55.00. This design can effectively improve distortion, optimize lens aberrations, and thus effectively enhance the imaging quality of the system.

[0068] The material refractive index Nd2 and the material Abbe number constant Vd2 of the second lens E2 satisfy the following conditions: 1.65<Nd2<2.00, 17.00<Vd2<50.00. This design can eliminate spherical aberration and effectively improve the imaging quality of the system.

[0069] The refractive index Nd3 and Abbe number Vd3 of the third lens element E3 satisfy the following conditions: 1.43<Nd3<2.00, 50.00<Vd3<95.00. This design can effectively improve distortion and field curvature, ensure good optical performance, and enhance the resolving power of the lens.

[0070] The material refractive index Nd4 and Abbe number Vd4 of the fourth lens element E4 satisfy the following conditions: 1.43<Nd4<2.00, 50.00<Vd4<95.00. This design can effectively improve distortion and field curvature, eliminate dispersion, ensure excellent optical performance, and enhance the lens's resolving power and imaging quality.

[0071] The refractive index Nd5 and Abbe number Vd5 of the fifth lens element E5 satisfy the following conditions: 1.43 < Nd5 < 2.00, 50.00 < Vd5 < 95.00. This design effectively improves distortion and field curvature, ensuring excellent optical performance, further preserving the viewing angle, and enhancing the lens's resolving power.

[0072] The refractive index Nd6 and Abbe number Vd6 of the sixth lens element E6 satisfy the following conditions: 1.65<Nd6<2.00, 17.00<Vd6<50.00. This design effectively improves field curvature and eliminates dispersion, thereby effectively enhancing the imaging quality of the system.

[0073] Furthermore, the full field of view FOV of the optical system satisfies: 20.00°<FOV<40.00°. This design meets the low distortion of the lens. The optical system configured in the present invention has the advantages of excellent temperature characteristics and ultra-high pixels, compact structure, easy processing and installation, and good imaging resolution. This application has great potential for application in the field of automotive forward vision by reasonably allocating the surface shape and optical focal length of each lens, while taking into account the advantages of high resolution, excellent temperature characteristics, large aperture, etc.

[0074] Furthermore, the curvature radius R21 of the object-side surface S3 of the second lens E2 and the curvature radius R22 of the image-side surface S4 satisfy the following relationship: 0.15<(R21+R22) / R22<2.0. By controlling the curvature radii of the object-side surface and the image-side surface of the second lens, the total deflection angle of the object-side surface and the image-side surface of the second lens at the edge of the field of view can be reasonably controlled within a reasonable range, which can effectively reduce the sensitivity of the system and improve the resolving power of the lens.

[0075] Furthermore, the curvature radius R31 of the object-side surface S5 of the third lens E3 and the curvature radius R32 of the image-side surface S6 satisfy the relationship: R31 / R32>1.0. By controlling the curvature radii of the object-side surface and the image-side surface of the third lens, the edge thickness and the center thickness of the lens are within a reasonable range, which can effectively improve the resolution of the lens.

[0076] Furthermore, the curvature radius R41 of the object-side surface S7 of the fourth lens E4 and the curvature radius R42 of the image-side surface S8 satisfy the relationship: R41 / R42>0.4. By controlling the curvature radii of the object-side surface and the image-side surface of the fourth lens, the edge thickness and the center thickness of the lens are within a reasonable range, which can effectively improve the resolution of the lens.

[0077] Example 1:

[0078] Specifically, as a preferred embodiment of the present invention but not limiting, the following reference is made to Figures 1 to 3 The optical imaging lens of Example 1 of the present application is described as follows: Figure 1 As shown, the optical imaging lens according to an exemplary embodiment of the present application is composed of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15 in sequence from the object plane to the image plane along the optical axis.

[0079] The effective focal length f of the optical system, the axial distance TTL between the object-side surface S1 and the imaging surface S15 of the first lens element E1, and half the horizontal length of the effective pixel area on the imaging surface ImgH satisfy the following relationship: f / TTL*ImgH=2.395; the curvature radius R21 of the object-side surface S3 of the second lens element E2 and the curvature radius R22 of the image-side surface S4 satisfy the following relationship: (R21+R22) / R22=0.430; the curvature radius R31 of the object-side surface S5 of the third lens element E3 and the curvature radius R32 of the image-side surface S6 satisfy the following relationship: R31 / R32=1.350; and the curvature radius R41 of the object-side surface S7 of the fourth lens element E4 and the curvature radius R42 of the image-side surface S8 satisfy the following relationship: R41 / R42=0.418.

[0080] The first lens has positive power and a convex object-side surface; the second lens has negative power, a concave object-side surface, and a concave image-side surface; the third lens has positive power, a concave object-side surface, and a convex image-side surface; the fourth lens has positive power, a convex object-side surface, and a convex image-side surface; the fifth lens has positive power and a convex object-side surface; the sixth lens has negative power and a concave object-side surface. Filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through surfaces S1 to S14 in sequence and is ultimately imaged on imaging surface S15.

[0081] Table 1 shows the surface type, curvature radius, thickness, and material of each lens of the optical imaging lens of Example 1, wherein the units of curvature radius and thickness are both millimeters (mm).

[0082] Table 1: Basic parameters of the optical system of Example 1

[0083] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 17.216 2.49 1.90,39.20 S2 spherical surface 284.19 0.13 STOP spherical surface Infinity 4.13 S3 spherical surface -14.499 1.69 1.85,23.80 S4 spherical surface 25.239 1.23 S5 spherical surface -13.903 2.54 1.60,68.30 S6 spherical surface -10.298 0.09 S7 spherical surface 12.612 7.20 1.60,68.30 S8 spherical surface -30.151 0.13 S9 spherical surface 16.354 4.84 1.75,52.30 S10 spherical surface -80.000 1.53 S11 spherical surface -10.453 1.56 1.50,48.85 S12 spherical surface 18.339 3.00 S13 spherical surface Infinity 0.80 1.50,64.20 S14 spherical surface Infinity 0.37 S15 spherical surface Infinity

[0084] Figure 2 The MTF curve of the optical imaging lens of Example 1 is shown, which represents the imaging quality of the lens. Figure 3 The astigmatism and distortion curves of the optical imaging lens of Example 1 are shown. Astigmatism represents the meridional image curvature and sagittal image curvature; distortion represents the distortion magnitude corresponding to different image heights. Figure 2 and 3 It can be seen that the optical system provided in Example 1 can achieve good imaging quality and realize a high-performance design.

[0085] Example 2:

[0086] Specifically, as a preferred embodiment of the present invention but not limiting, the following reference is made to Figures 4 to 6 Describe the optical imaging lens of Example 2 of the present application, such as Figure 4As shown, the optical imaging lens according to an exemplary embodiment of the present application is composed of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15 in sequence from the object plane to the image plane along the optical axis.

[0087] The effective focal length f of the optical system, the axial distance TTL between the object-side surface S1 and the imaging surface S15 of the first lens element E1, and half the horizontal length of the effective pixel area on the imaging surface ImgH satisfy the following relationship: f / TTL*ImgH=2.440; the curvature radius R21 of the object-side surface S3 of the second lens element E2 and the curvature radius R22 of the image-side surface S4 satisfy the following relationship: (R21+R22) / R22=0.543; the curvature radius R31 of the object-side surface S5 of the third lens element E3 and the curvature radius R32 of the image-side surface S6 satisfy the following relationship: R31 / R32=1.294; and the curvature radius R41 of the object-side surface S7 of the fourth lens element E4 and the curvature radius R42 of the image-side surface S8 satisfy the following relationship: R41 / R42=0.438.

[0088] The first lens has positive power and a convex object-side surface; the second lens has negative power, a concave object-side surface, and a concave image-side surface; the third lens has positive power, a concave object-side surface, and a convex image-side surface; the fourth lens has positive power, a convex object-side surface, and a convex image-side surface; the fifth lens has positive power and a convex object-side surface; and the sixth lens has negative power and a concave object-side surface. Filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through surfaces S1 to S14 in sequence and is ultimately imaged on imaging surface S15.

[0089] [4] Table 2 shows the surface type, curvature radius, thickness and material of each lens of the optical imaging lens of Example 2, where the units of curvature radius and thickness are both millimeters (mm).

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

[0091] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 17.466 2.56 1.90,39.20 S2 spherical surface 342.109 0.15 STOP spherical surface Infinity 4.04 S3 spherical surface -13.707 1.24 1.85,23.80 S4 spherical surface 30.000 1.20 S5 spherical surface -12.894 2.76 1.60,68.35 S6 spherical surface -9.961 0.10 S7 spherical surface 12.311 6.88 1.60,68.35 S8 spherical surface -28.102 0.11 S9 spherical surface 15.895 4.91 1.75,52.35 S10 spherical surface 84.976 1.69 S11 spherical surface -9.374 1.22 1.50,48.85 S12 spherical surface 45.912 3.00 S13 spherical surface Infinity 0.80 1.50,64.20 S14 spherical surface Infinity 0.48 S15 spherical surface Infinity

[0092] Figure 5 The MTF curve of the optical imaging lens of Example 2 is shown, which represents the imaging quality of the lens. Figure 6 The astigmatism and distortion curves of the optical imaging lens of Example 2 are shown. Astigmatism represents the meridional image curvature and sagittal image curvature; distortion represents the distortion magnitude corresponding to different image heights. Figure 5 and 6 It can be seen that the optical system provided in Example 2 can achieve good imaging quality and realize a high-performance design.

[0093] A camera module includes at least an optical lens, in which the above-mentioned long-focus, low-distortion vehicle-mounted optical system is installed. The optical system 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. By rationally allocating the surface shape and optical focal length of each lens, lens aberrations are optimized and the lens resolving power is improved. At the same time, the characteristics of excellent temperature characteristics and large aperture are taken into account to meet the use of high pixels. The camera module has great potential for application in the field of vehicle-mounted forward vision.

[0094] 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 long-focus, low-distortion 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 first lens has positive refractive power, its object-side surface is convex, and its image-side surface is concave; The second lens has negative optical power, its object-side surface is concave, and its image-side surface is concave; The third lens has positive refractive power, its object side surface is concave, and its image side surface is convex; The fourth lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex; The fifth lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex or concave; The sixth lens has negative optical power, its object-side surface is concave, and its image-side surface is concave; The optical system satisfies the following relationship: 2.00<f / TTL*ImgH<3.50; Wherein, f is the effective focal length of the optical system, TTL is the distance from the center of the object-side surface of the first lens to the imaging plane of the optical system on the optical axis, and ImgH is half the horizontal length of the effective pixel area on the imaging plane; The optical system meets the following conditions: 15.0mm<f1<25.0mm; -20.0mm<f2<-5.0mm; 40.0mm<f3<60.0mm; 10.0mm<f4<25.0mm; 10.0mm<f5<30.0mm; -20.0mm<f6<-5.0mm; 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.

2. The long-focus, low-distortion vehicle-mounted optical system according to claim 1, characterized in that: The optical system meets the following conditions: 1.0<f1 / f<3.0; -5.0<f2 / f<-0.5; 2.0<f3 / f<4.0; 1.0<f4 / f<6.0; 1.0<f5 / f<8.0; -2.0<f6 / f<-0.5; 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.

3. The long-focus, low-distortion vehicle-mounted optical system according to any one of claims 1 to 2, characterized in that: The material refractive index Nd1 and the material Abbe number Vd1 of the first lens satisfy the following conditions: 1.80<Nd1<2.05, 25.00<Vd1<55.00; The material refractive index Nd2 and the material Abbe number Vd2 of the second lens satisfy the following conditions: 1.65<Nd2<2.00, 17.00<Vd2<50.00; The material refractive index Nd3 and the material Abbe number Vd3 of the third lens satisfy the following conditions: 1.43<Nd3<2.00, 50.00<Vd3<95.00; The material refractive index Nd4 and the material Abbe number Vd4 of the fourth lens satisfy the following conditions: 1.43<Nd4<2.00, 50.00<Vd4<95.00; The refractive index Nd5 and Abbe number Vd5 of the material of the fifth lens satisfy the following conditions: 1.43<Nd5<2.00, 50.00<Vd5<95.00; The material refractive index Nd6 and the material Abbe number Vd6 of the sixth lens satisfy: 1.65<Nd6<2.00, 17.00<Vd6<50.

00.

4. The long-focus, low-distortion vehicle-mounted optical system according to any one of claims 1-2, characterized in that: The full field of view (FOV) of the optical system satisfies: 20.00°<FOV<40.00°.

5. The long-focus, low-distortion vehicle-mounted optical system according to any one of claims 1-2, characterized in that: A curvature radius R21 of the object-side surface and a curvature radius R22 of the image-side surface of the second lens satisfy the following relationship: 0.15<(R21+R22) / R22<2.

0.

6. The long-focus, low-distortion vehicle-mounted optical system according to any one of claims 1-2, characterized in that: A curvature radius R31 of the object-side surface and a curvature radius R32 of the image-side surface of the third lens satisfy the relationship: R31 / R32>1.

0.

7. The long-focus, low-distortion vehicle-mounted optical system according to any one of claims 1-2, characterized in that: A curvature radius R41 of the object-side surface and a curvature radius R42 of the image-side surface of the fourth lens satisfy the relationship: R41 / R42>0.

4.

8. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with the long-focus, low-distortion vehicle-mounted optical system according to any one of claims 1 to 7.

Images