Vehicle-mounted forward-looking optical lens

Abstract

The application provides a vehicle-mounted forward-looking optical lens, which is sequentially provided with a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a filter IR, a protective glass CG and an image plane IMA along the light incidence direction; wherein the first lens is a glass aspheric lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all glass spherical lenses; wherein the fifth lens and the sixth lens are combined to form a cemented lens or the fourth lens and the fifth lens are combined to form a cemented lens; the application provides a vehicle-mounted forward-looking optical lens with high resolution, large aperture, high resolution, large field of view and low production cost.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, and more specifically to a vehicle-mounted forward-looking optical lens. Background Technology

[0002] With the advancement and development of autonomous driving technology, the technical requirements for vehicle cameras in autonomous driving systems have been continuously increasing in recent years. Among them, the forward-facing camera is an important part of the autonomous driving system, mainly used to collect information about road conditions ahead of the vehicle.

[0003] However, traditional forward-looking camera lenses have low image resolution, small depth of field, and small aperture. They cannot capture details of distant objects while maintaining a large field of view, making it impossible to accurately monitor the vehicle's surroundings in real time, which poses certain driving risks. In addition, traditional forward-looking camera lenses use multiple aspherical glass lenses, resulting in high production costs. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a high-resolution, large-aperture, high-resolution, wide-field-of-view, and low-production-cost automotive forward-looking optical lens.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A vehicle-mounted forward-looking optical lens, comprising, in sequence along the light incident direction, a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an IR filter, a CG protective glass, and an IMA image plane;

[0007] The first lens is a glass aspherical lens, and the second, third, fourth, fifth, sixth, and seventh lenses are all glass spherical lenses.

[0008] The fifth lens is combined with the sixth lens to form a cemented lens, or the fourth lens is combined with the fifth lens to form a cemented lens.

[0009] This invention provides a high-resolution, large-aperture, wide-field-of-view, and low-production-cost automotive front-view optical lens.

[0010] As a preferred technical solution, the first lens has negative optical power, and its object side is convex and its image side is concave.

[0011] The second lens has negative optical power, with its object side being concave and its image side being convex.

[0012] The third lens has positive optical power, and its object side is concave or convex, while its image side is convex.

[0013] The fourth lens has positive optical power, and its object side and image side are both convex.

[0014] The fifth lens has either positive or negative optical power;

[0015] The sixth lens has a positive or negative optical power;

[0016] The seventh lens has positive optical power, with its object side being convex and its image side being concave.

[0017] As a preferred technical solution, the first lens has Nd1>1.75 and Vd1<45, where Nd1 refers to the refractive index of the first lens and Vd1 refers to the Abbe number of the first lens;

[0018] The second lens has Nd2 > 1.75 and Vd2 < 50, where Nd2 refers to the refractive index of the second lens and Vd2 refers to the Abbe number of the second lens.

[0019] The third lens has Nd3>1.75 and Vd3<45, where Nd3 refers to the refractive index of the third lens and Vd3 refers to the Abbe number of the third lens.

[0020] The fourth lens has Nd4 < 1.7 and Vd4 < 55, where Nd4 refers to the refractive index of the fourth lens and Vd4 refers to the Abbe number of the fourth lens.

[0021] The fifth lens has Nd5 < 1.7 and Vd5 < 55, where Nd5 refers to the refractive index of the fifth lens and Vd5 refers to the Abbe number of the fifth lens.

[0022] The sixth lens has Nd6 > 1.8 and Vd6 < 40, where Nd6 refers to the refractive index of the sixth lens and Vd6 refers to the Abbe number of the sixth lens.

[0023] The seventh lens has Nd7 > 1.7 and Vd7 < 55, where Nd7 refers to the refractive index of the seventh lens and Vd7 refers to the Abbe number of the seventh lens.

[0024] As a preferred technical solution, the first lens has Nd1>1.75 and Vd1<45, where Nd1 refers to the refractive index of the first lens and Vd1 refers to the Abbe number of the first lens;

[0025] The second lens has Nd2 > 1.75 and Vd2 < 50, where Nd2 refers to the refractive index of the second lens and Vd2 refers to the Abbe number of the second lens.

[0026] The third lens has Nd3 > 1.7 and Vd3 < 55, where Nd3 refers to the refractive index of the third lens and Vd3 refers to the Abbe number of the third lens.

[0027] The fourth lens has Nd4 < 1.7 and Vd4 < 55, where Nd4 refers to the refractive index of the fourth lens and Vd4 refers to the Abbe number of the fourth lens.

[0028] The fifth lens has Nd5 > 1.8 and Vd5 < 40, where Nd5 refers to the refractive index of the fifth lens and Vd5 refers to the Abbe number of the fifth lens.

[0029] The sixth lens has Nd6 < 1.7 and Vd6 < 55, where Nd6 refers to the refractive index of the sixth lens and Vd6 refers to the Abbe number of the sixth lens.

[0030] The seventh lens has Nd7 > 1.75 and Vd7 < 55, where Nd7 refers to the refractive index of the seventh lens and Vd7 refers to the Abbe number of the seventh lens.

[0031] As a preferred technical solution, the fourth lens satisfies dn / dt4 < -3X10 -6 ℃, where dn / dt4 refers to the refractive index temperature coefficient of the fourth lens; the fifth lens satisfies dn / dt5 < -3 × 10 ℃. -6 ℃, where dn / dt5 refers to the refractive index temperature coefficient of the fifth lens.

[0032] As a preferred technical solution, the fifth lens satisfies dn / dt5 < -3X10 -6 ℃, where dn / dt5 refers to the refractive index temperature coefficient of the fifth lens; the sixth lens satisfies dn / dt6 < -3 × 10 ℃. -6 ℃, where dn / dt6 refers to the refractive index temperature coefficient of the sixth lens.

[0033] As a preferred technical solution, the optical lens satisfies the condition: BFL / TTL > 0.13, where BFL is the distance from the center of the image side of the last lens of the optical lens to the imaging surface of the optical lens on the optical axis; and TTL is the distance from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis.

[0034] As a preferred technical solution, the maximum field of view (FOV) of the optical lens, the total focal length (f) of the optical lens, and the image height (h) corresponding to the maximum field of view of the optical lens satisfy the following condition: 75 ≤ (FOV × f) / h ≤ 76.5.

[0035] As a preferred technical solution, the optical lens satisfies the following conditions: -1.75≤f1 / f≤-2.05, -4.5≤f2 / f≤-3, 1.5≤f3 / f≤5.5, 1.5≤f4 / f≤2.5, 1.45≤f5 / f≤1.65, -1.55≤f6 / f≤-1.1, 2.85≤f7 / f≤6.5, where f1, f2, f3, f4, f5, f6, and f7 are the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens, respectively.

[0036] As a preferred technical solution, the optical lens satisfies the following conditions: -1.75≤f1 / f≤-2.05, -10.5≤f2 / f≤-8.5, 1.5≤f3 / f≤5.5, 1.5≤f4 / f≤2.5, -1.8≤f5 / f≤-1.2, 4.5≤f6 / f≤5.5, 2.85≤f7 / f≤6.5, where f1, f2, f3, f4, f5, f6 and f7 are the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens and seventh lens, respectively. Attached Figure Description

[0037] Figure 1 This is a structural diagram of a vehicle-mounted forward-looking optical lens;

[0038] Figure 2 This is a structural diagram of a vehicle-mounted forward-looking optical lens;

[0039] Figure 3 This is a structural diagram of a vehicle-mounted forward-looking optical lens;

[0040] Wherein, 1-first lens; 2-second lens; 3-third lens; 4-fourth lens; 5-fifth lens; 6-sixth lens; 7-seventh lens; 8-filter IR; 9-protective glass CG; 10-image plane IMA; 11-aperture. Detailed Implementation

[0041] It should be noted that the use of terms such as "first," "second," "third," "fourth," "fifth," "sixth," and "seventh" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0042] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0043] It is understood that the present invention achieves its purpose through some embodiments.

[0044] Example 1

[0045] like Figure 1 As shown, this embodiment provides a vehicle-mounted forward-looking optical lens, which is provided with a first lens 1, a second lens 2, a third lens 3, an aperture 11, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, a filter IR8, a protective glass CG9, and an image plane IMA10 in sequence along the light incident direction.

[0046] The first lens 1 is a glass aspherical lens, and the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6 and the seventh lens 7 are all glass spherical lenses;

[0047] The fifth lens 6 and the sixth lens 7 are combined to form a cemented lens, which is beneficial for correcting chromatic aberration in the system.

[0048] The fifth lens 5 satisfies dn / dt5 < -3X10 -6 ℃, where dn / dt5 refers to the refractive index temperature coefficient of the fifth lens 5; the sixth lens 6 satisfies dn / dt6 < -3X10 -6 ℃, where dn / dt6 refers to the refractive index temperature coefficient of the sixth lens 6.

[0049] The automotive forward-looking optical lens of this application is used in ADAS lenses and meets the high temperature stability requirements of ADAS lenses.

[0050] The first lens 1 has negative optical power, its object side is convex and its image side is concave. The first lens has negative optical power and is a glass aspherical lens, which is beneficial for collecting light, improving the imaging quality of the system, and reducing the head size.

[0051] The second lens 2 has negative optical power, its object side is concave and its image side is convex. The second lens is a meniscus negative lens, which can receive light and reduce system aberrations.

[0052] The third lens 3 has positive optical power, its object side is concave and its image side is convex. The third lens has positive optical power and can refract light to reduce the sensitivity of the lens in the system.

[0053] The fourth lens 4 has positive optical power, its object side is convex, its image side is convex, and the fourth lens has positive optical power, which can receive light and improve the lens temperature stability.

[0054] The fifth lens 5 has positive or negative optical power, and its object side is convex and its image side is convex.

[0055] The sixth lens 6 has positive or negative optical power, and its object side is concave and its image side is convex.

[0056] The seventh lens 7 has positive optical power, its object side is convex, and its image side is concave. The positive optical power of the seventh lens is beneficial for deflecting light rays, reducing field curvature, and improving image quality.

[0057] The optical parameters of the optical lens provided in Example 1 are shown in Table 1 below:

[0058] Table 1 shows the optical parameters of the optical lens provided in Example 1.

[0059]

[0060] As can be seen from Table 1, the first lens 1 has Nd1>1.75 and Vd1<45, where Nd1 refers to the refractive index of the first lens and Vd1 refers to the Abbe number of the first lens.

[0061] The second lens has 2Nd2>1.75 and Vd2<50, where Nd2 refers to the refractive index of the second lens and Vd2 refers to the Abbe number of the second lens;

[0062] The third lens has 3Nd3>1.75 and Vd3<45, where Nd3 refers to the refractive index of the third lens and Vd3 refers to the Abbe number of the third lens.

[0063] The fourth lens has 4Nd4<1.7 and Vd4<55, where Nd4 refers to the refractive index of the fourth lens and Vd4 refers to the Abbe number of the fourth lens.

[0064] The fifth lens has 5Nd5<1.7 and Vd5<55, where Nd5 refers to the refractive index of the fifth lens and Vd5 refers to the Abbe number of the fifth lens.

[0065] The sixth lens has Nd6 > 1.8 and Vd6 < 40, where Nd6 refers to the refractive index of the sixth lens and Vd6 refers to the Abbe number of the sixth lens.

[0066] The seventh lens has Nd7 > 1.7 and Vd7 < 55, where Nd7 refers to the refractive index of the seventh lens and Vd7 refers to the Abbe number of the seventh lens.

[0067] In Table 1, when the radius of curvature of the surfaces of aperture 11 (STO), filter 8 (IR), and protective glass 9 (CG) is Infinity, it indicates that the surface is a plane.

[0068] The optical lens satisfies the condition: BFL / TTL > 0.13, where BFL is the distance from the center of the image side of the seventh lens 7 to the imaging surface of the optical lens on the optical axis; TTL is the distance from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis. Furthermore, BFL / TTL > 0.13 is beneficial for increasing the optical back focal length of the lens and leaving sufficient space for the module.

[0069] The maximum field of view (FOV) of the optical lens, the total focal length (f) of the optical lens, and the image height (h) corresponding to the maximum field of view of the optical lens satisfy the following condition: 75 ≤ (FOV × f) / h ≤ 76.5. Controlling these three indicators helps to reduce lens distortion.

[0070] The optical lens satisfies the following conditions: -1.75≤f1 / f≤-2.05, -4.5≤f2 / f≤-3, 1.5≤f3 / f≤5.5, 1.5≤f4 / f≤2.5, 1.45≤f5 / f≤1.65, -1.55≤f6 / f≤-1.1, 2.85≤f7 / f≤6.5, where f1, f2, f3, f4, f5, f6, and f7 are the focal lengths of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7, respectively. By reasonably matching the focal lengths of the lenses, it is beneficial to reduce assembly sensitivity and improve the assembly yield of the lens.

[0071] The first lens 1 is a glass aspherical lens, and its aspherical surface shape is described as follows:

[0072]

[0073] Where Z(h) is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis, c = 1 / r, r represents the radius of curvature of the aspherical mirror, k is the conic coefficient, and A, B, C, D, E, F, G, and H are the higher-order coefficients of the aspherical surface.

[0074] The aspherical surface profile parameters of the first lens are shown in Table 1-1 below:

[0075] Table 1-1 Aspherical surface parameters of the first lens

[0076] Face number K A B C D E F G H S1 -1.66 0 -2.04E-3 3.15E-4 3.20E-5 -9.66E-7 -1.27E-8 1.44E-9 -2.51E-11 S2 -0.82 0 -6.95E-3 -3.05E-4 -7.30E-5 4.30E-5 -6.67E-6 4.78E-7 -1.29E-8

[0077] Using aspherical surfaces in lens design can correct spherical aberration in the optical system, effectively improving the image quality of the lens. In addition, using aspherical surfaces for the first lens can reduce the incident angle of light, improve the relative illumination of the lens, and effectively reduce the head size of the lens, preventing the lens from becoming too large to use.

[0078] Example 1 provides a high-resolution, large-aperture, high-resolution, wide-field-of-view, and low-production-cost automotive front-view optical lens.

[0079] Example 2

[0080] like Figure 2 As shown, this embodiment provides a vehicle-mounted forward-looking optical lens, which is provided with a first lens 1, a second lens 2, a third lens 3, an aperture 11, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, a filter IR8, a protective glass CG9, and an image plane IMA10 in sequence along the light incident direction.

[0081] The first lens 1 is a glass aspherical lens, and the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6 and the seventh lens 7 are all glass spherical lenses;

[0082] The fifth lens 5 and the sixth lens 6 are combined to form a cemented lens, which is beneficial for correcting chromatic aberration in the system.

[0083] The fifth lens 5 satisfies dn / dt5 < -3X10 -6 ℃, where dn / dt5 refers to the refractive index temperature coefficient of the fifth lens 5; the sixth lens 6 satisfies dn / dt6 < -3X10 -6 ℃, where dn / dt6 refers to the refractive index temperature coefficient of the sixth lens 6.

[0084] The automotive forward-looking optical lens of this application is used in ADAS lenses and meets the high temperature stability requirements of ADAS lenses.

[0085] The first lens 1 has negative optical power, its object side is convex, and its image side is concave; the first lens 1 has negative optical power and is an aspherical glass surface, which is beneficial for collecting light, improving the imaging quality of the system, and reducing the head size.

[0086] The second lens 2 has negative optical power, with a concave object side and a convex image side; the second lens 2 is a meniscus negative lens, which can receive light and reduce system aberrations;

[0087] The third lens 3 has positive optical power, its object side is concave and its image side is convex. The third lens 3 has positive optical power, which can refract light rays to reduce the sensitivity of the lens in the system.

[0088] The fourth lens 4 has positive optical power, its object side is convex, and its image side is convex. The fourth lens 4 has positive optical power and can receive light to improve the lens temperature stability.

[0089] The fifth lens 5 has positive or negative optical power, and its object side is convex and its image side is convex.

[0090] The sixth lens 6 has positive or negative optical power, and its object side is concave and its image side is convex.

[0091] The seventh lens 7 has positive optical power, its object side is convex and its image side is concave. The positive optical power of the seventh lens 7 is beneficial for deflecting light rays, reducing field curvature and improving imaging quality.

[0092] The optical parameters of the optical lens provided in Example 2 are shown in Table 2 below:

[0093] Table 2 Optical parameters of the optical lens provided in Example 2

[0094]

[0095]

[0096] As can be seen from Table 2, for the first lens 1, Nd1 > 1.75 and Vd1 < 45, where Nd1 refers to the refractive index of the first lens 1 and Vd1 refers to the Abbe number of the first lens.

[0097] The second lens has 2Nd2>1.75 and Vd2<50, where Nd2 refers to the refractive index of the second lens and Vd2 refers to the Abbe number of the second lens;

[0098] The third lens has 3Nd3>1.75 and Vd3<45, where Nd3 refers to the refractive index of the third lens and Vd3 refers to the Abbe number of the third lens.

[0099] The fourth lens has 4Nd4<1.7 and Vd4<55, where Nd4 refers to the refractive index of the fourth lens and Vd4 refers to the Abbe number of the fourth lens.

[0100] The fifth lens has 5Nd5<1.7 and Vd5<55, where Nd5 refers to the refractive index of the fifth lens and Vd5 refers to the Abbe number of the fifth lens.

[0101] The sixth lens has Nd6 > 1.8 and Vd6 < 40, where Nd6 refers to the refractive index of the sixth lens and Vd6 refers to the Abbe number of the sixth lens.

[0102] The seventh lens has Nd7 > 1.7 and Vd7 < 55, where Nd7 refers to the refractive index of the seventh lens and Vd7 refers to the Abbe number of the seventh lens.

[0103] In Table 2, when the radius of curvature of the surfaces of aperture 11 (STO), filter 8 (IR), and protective glass 9 (CG) is Infinity, it indicates that the surface is a plane.

[0104] The optical lens satisfies the condition: BFL / TTL > 0.13, where BFL is the distance from the center of the image side of the last lens of the optical lens to the imaging surface of the optical lens on the optical axis; TTL is the distance from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis. Furthermore, BFL / TTL > 0.13 is beneficial for increasing the optical back focal length of the lens and leaving sufficient space for the module.

[0105] The maximum field of view (FOV) of the optical lens, the total focal length (f) of the optical lens, and the image height (h) corresponding to the maximum field of view of the optical lens satisfy the following condition: 75 ≤ (FOV × f) / h ≤ 76.5. Controlling these three indicators helps to reduce lens distortion.

[0106] The optical lens satisfies the following conditions: -1.75≤f1 / f≤-2.05, -4.5≤f2 / f≤-3, 1.5≤f3 / f≤5.5, 1.5≤f4 / f≤2.5, 1.45≤f5 / f≤1.65, -1.55≤f6 / f≤-1.1, 2.85≤f7 / f≤6.5, where f1, f2, f3, f4, f5, f6, and f7 are the focal lengths of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7, respectively. By reasonably matching the focal lengths of the lenses, it is beneficial to reduce assembly sensitivity and improve the assembly yield of the lens.

[0107] The first lens 1 is a glass aspherical lens, and its aspherical surface shape is described as follows:

[0108]

[0109] Where Z(h) is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis, c = 1 / r, r represents the radius of curvature of the aspherical mirror, k is the conic coefficient, and A, B, C, D, E, F, G, and H are the higher-order coefficients of the aspherical surface.

[0110] The aspherical surface profile parameters of the first lens are shown in Table 2-1 below:

[0111] Table 2-1 Aspherical surface parameters of the first lens

[0112] Face number K A B C D E F G H S1 -0.67 0 -2.48E-3 -2.07E-4 1.48E-5 -1.96E-7 -1.68E-8 8.16E-10 -1.2E-11 S2 -0.70 0 -5.39E-3 -6.23E-4 -6.93E-6 3.09E-5 -5.99E-6 5.08E-7 -1.66E-8

[0113] Using aspherical surfaces in lens design can correct spherical aberration in the optical system, effectively improving the image quality of the lens. In addition, using aspherical surfaces for the seventh lens can also reduce the incident angle of light, improve the relative illumination of the lens, and effectively reduce the size of the lens head, preventing the lens from becoming too large to use.

[0114] Example 2 provides a high-resolution, large-aperture, high-resolution, wide-field-of-view, and low-production-cost automotive front-view optical lens.

[0115] Example 3

[0116] like Figure 3 As shown, this embodiment provides a vehicle-mounted forward-looking optical lens, which is provided with a first lens 1, a second lens 2, a third lens 3, an aperture 11, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, a filter IR8, a protective glass CG9, and an image plane IMA10 in sequence along the light incident direction.

[0117] The first lens 1 is a glass aspherical lens, and the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6 and the seventh lens 7 are all glass spherical lenses;

[0118] The fourth lens 4 and the fifth lens 5 are combined to form a cemented lens, which is beneficial for correcting chromatic aberration in the system.

[0119] The fourth lens 4 satisfies dn / dt4 < -3X10 -6 ℃, where dn / dt4 refers to the refractive index temperature coefficient of the fourth lens 4; the fifth lens 5 satisfies dn / dt5 < -3X10 -6 ℃, where dn / dt5 refers to the refractive index temperature coefficient of the fifth lens 5.

[0120] The automotive forward-looking optical lens of this application is used in ADAS lenses and meets the high temperature stability requirements of ADAS lenses.

[0121] The first lens 1 has negative optical power, and its object side is convex and its image side is concave.

[0122] The second lens 2 has negative optical power, and its object side is concave and its image side is convex.

[0123] The third lens 3 has positive optical power, and its object side is convex, and its image side is convex.

[0124] The fourth lens 4 has positive optical power, and its object side is convex, and its image side is convex.

[0125] The fifth lens 5 has positive or negative optical power, and its object side is concave and its image side is convex.

[0126] The sixth lens 6 has positive or negative optical power, and its object side is convex and its image side is convex.

[0127] The seventh lens 7 has positive optical power, with its object side being convex and its image side being concave.

[0128] The optical parameters of the optical lens provided in Example 3 are shown in Table 1 below:

[0129] Table 3 shows the optical parameters of the optical lens provided in Example 3.

[0130]

[0131]

[0132] As can be seen from Table 3, for the first lens 1, Nd1 > 1.75 and Vd1 < 45, where Nd1 refers to the refractive index of the first lens 1 and Vd1 refers to the Abbe number of the first lens 1.

[0133] The second lens 2 has Nd2 > 1.75 and Vd2 < 50, where Nd2 refers to the refractive index of the second lens 2 and Vd2 refers to the Abbe number of the second lens 2.

[0134] The third lens 3 has Nd3 > 1.7 and Vd3 < 55, where Nd3 refers to the refractive index of the third lens 3 and Vd3 refers to the Abbe number of the third lens 3.

[0135] The fourth lens 4 has Nd4 < 1.7 and Vd4 < 55, where Nd4 refers to the refractive index of the fourth lens 4 and Vd4 refers to the Abbe number of the fourth lens 4.

[0136] The fifth lens 5 has Nd5 > 1.8 and Vd5 < 40, where Nd5 refers to the refractive index of the fifth lens 5 and Vd5 refers to the Abbe number of the fifth lens 5.

[0137] The sixth lens 6 has Nd6 < 1.7 and Vd6 < 55, where Nd6 refers to the refractive index of the sixth lens 6 and Vd6 refers to the Abbe number of the sixth lens 6.

[0138] The seventh lens 7 has Nd7 > 1.75 and Vd7 < 55, where Nd7 refers to the refractive index of the seventh lens 7 and Vd7 refers to the Abbe number of the seventh lens 7.

[0139] In Table 3, when the radius of curvature of the surfaces of aperture (STO) 11, filter (IR) 8, and protective glass (CG) 9 is Infinity, it indicates that the surface is a plane.

[0140] The optical lens satisfies the condition: BFL / TTL > 0.13, where BFL is the distance from the center of the image side of the seventh lens to the imaging surface of the optical lens on the optical axis; TTL is the distance from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis. Furthermore, BFL / TTL > 0.13 is beneficial for increasing the optical back focal length of the lens and leaving sufficient space for the module.

[0141] The maximum field of view (FOV) of the optical lens, the total focal length (f) of the optical lens, and the image height (h) corresponding to the maximum field of view of the optical lens satisfy the following condition: 75 ≤ (FOV × f) / h ≤ 76.5. Controlling these three indicators helps to reduce lens distortion.

[0142] The optical lens satisfies the following conditions: -1.75≤f1 / f≤-2.05, -10.5≤f2 / f≤-8.5, 1.5≤f3 / f≤5.5, 1.5≤f4 / f≤2.5, -1.8≤f5 / f≤-1.2, 4.5≤f6 / f≤5.5, 2.85≤f7 / f≤6.5. Here, f1, f2, f3, f4, f5, f6, and f7 are the focal lengths of the first, second, third, fourth, fifth, sixth, and seventh lenses, respectively.

[0143] The first lens is a glass aspherical lens, and the aspherical surface shape is described below:

[0144]

[0145] Where Z(h) is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis, c = 1 / r, r represents the radius of curvature of the aspherical mirror, k is the conic coefficient, and A, B, C, D, E, F, G, and H are the higher-order coefficients of the aspherical surface.

[0146] The aspherical surface profile parameters of the first lens are shown in Table 3-1 below:

[0147] Table 3-1 Aspherical surface parameters of the first lens

[0148] Face number K A B C D E F G H S1 -1.08 0 -3.09E-3 -1.41E-4 2.86E-6 9.82E-7 -6.52E-8 1.55E-9 -1.29E-11 S2 -0.72 0 -7.86E-3 -5.82E-4 9.87E-5 -1.66E-5 1.96E-6 -1.20E-7 2.98E-9

[0149] Using aspherical surfaces in lens design can correct spherical aberration in the optical system, effectively improving the image quality of the lens. In addition, using aspherical surfaces in the first lens can reduce the incident angle of light, improve the relative illumination of the lens, and effectively reduce the head size of the lens, preventing the lens from becoming too large to use.

[0150] Example 3 provides a high-resolution, large-aperture, high-resolution, wide-field-of-view, and low-production-cost automotive front-view optical lens.

[0151] It is understood that this invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by this invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of this invention.

Claims

1. A vehicle-mounted forward-looking optical lens, characterized in that, Along the direction of light incidence, there are sequentially arranged a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an IR filter, a CG protective glass, and an IMA image plane; The first lens is a glass aspherical lens, and the second, third, fourth, fifth, sixth, and seventh lenses are all glass spherical lenses. The fourth lens and the fifth lens are combined to form a cemented lens; The first lens has negative optical power, and its object side is convex while its image side is concave. The second lens has negative optical power, with its object side being concave and its image side being convex. The third lens has positive optical power, and its object side is convex, as is its image side; The fourth lens has positive optical power, and its object side is convex, as is its image side; The fifth lens has positive or negative optical power, and its object side is concave while its image side is convex. The sixth lens has positive or negative optical power, and its object side is convex and its image side is convex. The seventh lens has positive optical power, and its object side is convex while its image side is concave. The first lens has Nd1>1.75 and Vd1<45, where Nd1 refers to the refractive index of the first lens and Vd1 refers to the Abbe number of the first lens. The second lens has Nd2 > 1.75 and Vd2 < 50, where Nd2 refers to the refractive index of the second lens and Vd2 refers to the Abbe number of the second lens. The third lens has Nd3 > 1.7 and Vd3 < 55, where Nd3 refers to the refractive index of the third lens and Vd3 refers to the Abbe number of the third lens. The fourth lens has Nd4 < 1.7 and Vd4 < 55, where Nd4 refers to the refractive index of the fourth lens and Vd4 refers to the Abbe number of the fourth lens. The fifth lens has Nd5 > 1.8 and Vd5 < 40, where Nd5 refers to the refractive index of the fifth lens and Vd5 refers to the Abbe number of the fifth lens. The sixth lens has Nd6 < 1.7 and Vd6 < 55, where Nd6 refers to the refractive index of the sixth lens and Vd6 refers to the Abbe number of the sixth lens. The seventh lens has Nd7 > 1.75 and Vd7 < 55, where Nd7 refers to the refractive index of the seventh lens and Vd7 refers to the Abbe number of the seventh lens.

2. The vehicle-mounted forward-looking optical lens according to claim 1, characterized in that, The fourth lens satisfies dn / dt4 < -3×10 -6 ℃, where dn / dt4 refers to the refractive index temperature coefficient of the fourth lens; the fifth lens satisfies dn / dt5 < -3×10 -6 ℃, where dn / dt5 refers to the refractive index temperature coefficient of the fifth lens.

3. The vehicle-mounted forward-looking optical lens according to claim 1, characterized in that, The fifth lens satisfies dn / dt5 < -3×10 -6 ℃, where dn / dt5 refers to the refractive index temperature coefficient of the fifth lens; the sixth lens satisfies dn / dt6 < -3×10 -6 ℃, where dn / dt6 refers to the refractive index temperature coefficient of the sixth lens.

4. The vehicle-mounted forward-looking optical lens according to claim 1, characterized in that, The optical lens satisfies the condition: BFL / TTL > 0.13, where BFL is the distance on the optical axis from the center of the image side of the last lens to the imaging surface of the optical lens; and TTL is the distance on the optical axis from the center of the object side of the first lens to the imaging surface of the optical lens.

5. The vehicle-mounted forward-looking optical lens according to claim 1, characterized in that, The maximum field of view (FOV) of the optical lens, the total focal length (f) of the optical lens, and the image height (h) corresponding to the maximum field of view of the optical lens satisfy the following condition: 75 ≤ (FOV × f) / h ≤ 76.

5.

6. The vehicle-mounted forward-looking optical lens according to claim 1, characterized in that, The optical lens satisfies the following conditions: -1.75≤f1 / f≤-2.05, -4.5≤f2 / f≤-3, 1.5≤f3 / f≤5.5, 1.5≤f4 / f≤2.5, 1.45≤f5 / f≤1.65, -1.55≤f6 / f≤-1.1, 2.85≤f7 / f≤6.5, where f1, f2, f3, f4, f5, f6, and f7 are the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens, respectively.

7. The vehicle-mounted forward-looking optical lens according to claim 1, characterized in that, The optical lens satisfies the following conditions: -1.75≤f1 / f≤-2.05, -10.5≤f2 / f≤-8.5, 1.5≤f3 / f≤5.5, 1.5≤f4 / f≤2.5, -1.8≤f5 / f≤-1.2, 4.5≤f6 / f≤5.5, 2.85≤f7 / f≤6.5, where f1, f2, f3, f4, f5, f6, and f7 are the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens, respectively.

Images