Vehicle-mounted lens

Abstract

The invention discloses a vehicle-mounted lens, and relates to the technical field of optical systems, and the vehicle-mounted lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an image plane which are sequentially arranged from the object side to the image side in the optical axis direction. The first lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all glass spherical lenses, the second lens and the seventh lens are glass aspheric lenses, and the fourth lens and the fifth lens are connected in a gluing mode. The vehicle-mounted lens satisfies the following conditions:-4.0 < = f1 / f < = 0.5,-0.5 < = f2 / f < = 3.5, 0.5 < = f3 / f < = 2.5,-1.5 < = f4 / f < = 1.5,-0.5 < = f5 / f < = 2.0,-0.5 < = f6 / f < = 3.0,-2.5 < = f7 / f < = 2.5. Through the arrangement, the vehicle-mounted lens has the characteristics of high illumination, small distortion, clear imaging and high reduction degree, and the plurality of lenses are glass lenses, so that the vehicle-mounted lens has good temperature adaptability and can be used in a large-temperature-difference environment.

Description

Technical Field

[0001] This invention relates to the field of optical system technology, and in particular to a vehicle-mounted lens. Background Technology

[0002] Currently, with consumers' increasing demand for driving safety and convenience, the development of ADAS (Advanced Driver Assistance Systems) lenses is of great significance in the development of intelligent vehicles and autonomous driving technologies. To better capture the vehicle's surrounding environment (such as lane lines, pedestrians, and obstacles) in real time through cameras, and to avoid traffic accidents caused by collisions and lane departures, the market urgently needs a high-resolution optical ADAS lens to improve the driver's driving experience and safety, and promote urban traffic convenience.

[0003] However, mainstream automotive ADAS cameras on the market still suffer from problems such as low resolution, insufficient illumination, and poor environmental adaptability, making it impossible to achieve true real-time environmental perception. Summary of the Invention

[0004] The main objective of this invention is to propose an in-vehicle camera that addresses the problems of low resolution, insufficient illumination, and poor environmental adaptability in existing in-vehicle ADAS cameras, which prevent them from achieving true real-time environmental perception.

[0005] To achieve the above objectives, the present invention proposes a vehicle-mounted lens comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an image plane arranged sequentially from the object side to the image side along the optical axis. The first lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all spherical glass lenses, while the second lens and the seventh lens are aspherical glass lenses. The fourth lens and the fifth lens are cemented together. The vehicle-mounted lens satisfies the following conditions:

[0006] -4.0≤f1 / f≤0.5, -0.5≤f2 / f≤3.5, 0.5≤f3 / f≤2.5, -1.5≤f4 / f≤1.5, -0.5≤f5 / f≤2.0, -0.5≤f6 / f≤3.0, -2.5≤f7 / f≤2.5;

[0007] Wherein, the focal length of the vehicle-mounted lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, and the focal length of the seventh lens is f7.

[0008] In one embodiment, the optical power of the first lens is negative, and the object side and the image side of the first lens are concave.

[0009] The second lens has a positive optical power, and both the object side and the image side of the second lens are convex.

[0010] The third lens has a positive optical power, and the object side of the third lens is convex, while the image side is concave.

[0011] The fourth lens has a negative optical power, and the object side and image side of the fourth lens are both concave.

[0012] The fifth lens has a positive optical power, and both the object side and the image side of the fifth lens are convex.

[0013] The sixth lens has a positive optical power, and the object side of the sixth lens is convex, while the image side is concave.

[0014] The seventh lens has a negative optical power, and both the object side and the image side of the seventh lens are concave.

[0015] In one embodiment, the refractive index of the first lens is Nd1, and the Abbe constant of the first lens is Vd1, where 1.75≤Nd1≤1.95 and 25≤Vd1≤40.

[0016] The refractive index of the second lens is Nd2, and the Abbe constant of the second lens is Vd2, where 1.55≤Nd2≤1.80 and 45≤Vd2≤60.

[0017] The refractive index of the third lens is Nd3, and the Abbe constant of the third lens is Vd3, where 1.70≤Nd3≤1.90 and 20≤Vd3≤35.

[0018] The refractive index of the fourth lens is Nd4, and the Abbe constant of the fourth lens is Vd4, where 1.60≤Nd4≤1.90 and 20≤Vd4≤35.

[0019] The refractive index of the fifth lens is Nd5, and the Abbe constant of the fifth lens is Vd5, where 1.60≤Nd5≤1.85 and 45≤Vd5≤70.

[0020] The refractive index of the sixth lens is Nd6, and the Abbe constant of the sixth lens is Vd6, where 1.70≤Nd6≤1.95 and 30≤Vd6≤55.

[0021] The refractive index of the seventh lens is Nd7, and the Abbe constant of the seventh lens is Vd7, where 1.50≤Nd7≤1.75 and 50≤Vd7≤70.

[0022] In one embodiment, the vehicle-mounted lens further includes an aperture stop disposed between the third lens and the fourth lens.

[0023] In one embodiment, the optical power of the first lens is negative, and the object side of the first lens is concave and the image side is convex.

[0024] The second lens has a positive optical power, and both the object side and the image side of the second lens are convex.

[0025] The third lens has a positive optical power, and both the object side and the image side of the third lens are convex.

[0026] The fourth lens has a negative optical power, and the object side and image side of the fourth lens are both concave.

[0027] The fifth lens has a positive optical power, and both the object side and the image side of the fifth lens are convex.

[0028] The sixth lens has a positive optical power, and the object side of the sixth lens is convex, while the image side is concave.

[0029] The seventh lens has a negative optical power, and both the object side and the image side of the seventh lens are concave.

[0030] In one embodiment, the refractive index of the first lens is Nd1, and the Abbe constant of the first lens is Vd1, where 1.50≤Nd1≤1.75 and 25≤Vd1≤45.

[0031] The refractive index of the second lens is Nd2, and the Abbe constant of the second lens is Vd2, where 1.60≤Nd2≤1.80 and 45≤Vd2≤60.

[0032] The refractive index of the third lens is Nd3, and the Abbe constant of the third lens is Vd3, where 1.35≤Nd3≤1.65 and 75≤Vd3≤95.

[0033] The refractive index of the fourth lens is Nd4, and the Abbe constant of the fourth lens is Vd4, where 1.60≤Nd4≤1.85 and 20≤Vd4≤40.

[0034] The refractive index of the fifth lens is Nd5, and the Abbe constant of the fifth lens is Vd5, where 1.45≤Nd5≤1.75 and 50≤Vd5≤75.

[0035] The refractive index of the sixth lens is Nd6, and the Abbe constant of the sixth lens is Vd6, where 1.80≤Nd6≤2.00 and 25≤Vd6≤50.

[0036] The refractive index of the seventh lens is Nd7, and the Abbe constant of the seventh lens is Vd7, where 1.55≤Nd7≤1.85 and 45≤Vd7≤70.

[0037] In one embodiment, the vehicle-mounted lens further includes an aperture stop disposed between the first lens and the second lens.

[0038] In one embodiment, the distance between the center of the image-side surface of the seventh lens and the image plane is BFL, and the distance between the center of the object-side surface of the first lens and the image plane is TTL, where BFL / TTL > 0.08; and / or,

[0039] The maximum field of view of the vehicle-mounted lens is FOV, and the corresponding image height is h, where 55≤(FOV×f) / h≤70.

[0040] In one embodiment, the vehicle-mounted lens further includes a protective glass disposed between the seventh lens and the image plane.

[0041] In the technical solution of this invention, the light collected by the vehicle-mounted lens is sequentially incident on the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens to illuminate the image plane for imaging. At this time, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all glass lenses. This allows the lenses to have good resistance to thermal deformation, reducing the impact of temperature on the vehicle-mounted lens and enabling it to have good thermal distortion performance. Simultaneously, the second lens and the seventh lens are set aspherical lenses, which allows them to have better radius of curvature characteristics and improves distortion aberrations, astigmatism, and other aberrations. Using aspherical lenses can eliminate aberrations that occur during imaging as much as possible, improving edge image quality and thus enhancing the overall image quality of the lens. With this configuration, by combining materials and allocating surface shapes for the multiple lenses of the vehicle-mounted lens, and by rationally controlling the focal lengths of the first, second, third, fourth, fifth, sixth, and seventh lenses, the resolution of the vehicle-mounted lens can reach eight megapixels. Furthermore, the vehicle-mounted lens possesses characteristics of high illumination, low distortion, clear imaging, and high fidelity. Moreover, since all lenses are made of glass, the vehicle-mounted lens has good temperature adaptability and can be used in environments with large temperature differences. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the structure of the first embodiment of the vehicle-mounted lens provided by the present invention;

[0044] Figure 2 for Figure 1 A dot diagram of the first embodiment of the vehicle-mounted camera;

[0045] Figure 3 for Figure 1 A schematic diagram of light aberrations in the first embodiment of the vehicle-mounted lens;

[0046] Figure 4 This is a schematic diagram of the structure of the second embodiment of the vehicle-mounted lens provided by the present invention;

[0047] Figure 5 for Figure 4 A dot diagram of the second embodiment of the vehicle-mounted camera;

[0048] Figure 6 for Figure 4 A schematic diagram of light aberrations in the second embodiment of the vehicle-mounted lens.

[0049] Explanation of icon numbers:

[0050] 100. Vehicle-mounted lens; 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens; 7. Seventh lens; 8. Aperture stop; 9. Beam splitter glass; 10. Protective glass; 11. Image plane.

[0051] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0053] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0054] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0055] This invention proposes an optical lens designed to improve upon existing automotive ADAS lenses, which suffer from low resolution, insufficient illumination, and poor environmental adaptability, thus failing to achieve true real-time environmental perception.

[0056] Please see Figure 1 In one embodiment of the present invention, the optical lens includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, and an image plane 11 arranged sequentially from the object side to the image side along the optical axis. The first lens 1, the third lens 3, the fourth lens 4, the fifth lens 5, and the sixth lens 6 are all glass spherical lenses, the second lens 2 and the seventh lens 7 are glass aspherical lenses, and the fourth lens 4 and the fifth lens 5 are cemented together. The vehicle-mounted lens 100 satisfies the following condition: -4.0 ≤ f 1 / f≤0.5, -0.5≤f2 / f≤3.5, 0.5≤f3 / f≤2.5, -1.5≤f4 / f≤1.5, -0.5≤f5 / f≤2.0, -0.5≤f6 / f≤3.0, -2.5≤f7 / f≤2.5; the focal length of the vehicle-mounted lens 100 is f, the focal length of the first lens 1 is f1, the focal length of the second lens 2 is f2, the focal length of the third lens 3 is f3, the focal length of the fourth lens 4 is f4, the focal length of the fifth lens 5 is f5, the focal length of the sixth lens 6 is f6, and the focal length of the seventh lens 7 is f7.

[0057] In the technical solution of the present invention, the light collected by the vehicle-mounted lens 100 is sequentially incident on 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 to illuminate the image plane 11 for imaging. At this time, 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 are all set as glass lenses. In this way, the above-mentioned lenses can all have good resistance to thermal deformation, reduce the influence of temperature on the vehicle-mounted lens 100, and enable the vehicle-mounted lens 100 to have good thermal distortion performance. At the same time, the second lens 2 and the seventh lens 7 are set as aspherical lenses. In this way, the second lens 2 and the seventh lens 7 can both have better radius of curvature characteristics and have the advantages of improving distortion aberration and astigmatism. By using aspherical lenses, aberrations that occur during imaging can be eliminated as much as possible, improving edge image quality, thereby improving the imaging quality of the lens. With this configuration, by combining materials and allocating surface shapes for the multiple lenses of the vehicle-mounted lens 100, and by rationally controlling 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, the resolution of the vehicle-mounted lens 100 can reach eight megapixels. Furthermore, the vehicle-mounted lens 100 possesses characteristics of high illumination, low distortion, clear imaging, and high fidelity. Moreover, since all lenses are glass lenses, the vehicle-mounted lens 100 has good temperature adaptability and can be used in environments with large temperature differences.

[0058] It is understood that in this invention, when light enters the vehicle-mounted lens 100, the light first enters the first lens 1. At this time, since the first lens 1 is a glass lens, the deformation of the first lens 1 due to heat is small. Thus, the heat of the incident light can be reduced to reduce the impact of the heat of the incident light on the imaging of the optical lens. Afterward, the light enters 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 in sequence. At this time, the multiple glass lenses can reduce the impact of the heat of the incident light on the imaging of the optical lens by their own good resistance to heat deformation, thereby ensuring the imaging quality of the vehicle-mounted lens 100.

[0059] It should be noted that the present invention does not limit the specific values ​​of 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. In the present invention, 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 can all be set to any value within the corresponding range, as long as the focal lengths of the seven lenses are coordinated to ensure the imaging quality of the vehicle-mounted lens 100. In actual settings, they can be selected according to requirements, and the present invention does not impose any restrictions on this.

[0060] It should also be noted that, in this invention, by bonding the fourth lens 4 and the fifth lens 5 together, light energy loss can be further reduced, thereby increasing image clarity, protecting the scale surface, and optimizing the processing flow to meet design requirements. By using the bonding components appropriately, the optical components can improve the image quality of the vehicle lens 100. Furthermore, by bonding the two lenses together, the chromatic aberration of the vehicle lens 100 can be further corrected, thereby improving the color saturation of the image captured by the vehicle lens 100.

[0061] Further, in one embodiment of the present invention, the refractive index of the first lens 1 is Nd1, 1.75≤Nd1≤1.95; the refractive index of the second lens 2 is Nd2, 1.55≤Nd2≤1.80; the refractive index of the third lens 3 is Nd3, 1.70≤Nd3≤1.90; the refractive index of the fourth lens 4 is Nd4, 1.60≤Nd4≤1.90; the refractive index of the fifth lens 5 is Nd5, 1.60≤Nd5≤1.85; the refractive index of the sixth lens 6 is Nd6, 1.70≤Nd6≤1.95; and the refractive index of the seventh lens 7 is Nd7, 1.50≤Nd7≤1.75.

[0062] It is understood that the present invention does not limit the specific values ​​of the refractive indices 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. In the present invention, the refractive indices 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 can all be set to any value within the corresponding range. It is only necessary to ensure that the refractive indices of the seven lenses are matched to guarantee the molding quality of the vehicle-mounted lens 100. In actual settings, they can be selected according to requirements.

[0063] Furthermore, in another embodiment of the present invention, the Abbe constant of the first lens 1 is Vd1, 25≤Vd1≤40; the Abbe constant of the second lens 2 is Vd2, 45≤Vd2≤60; the Abbe constant of the third lens 3 is Vd3, 20≤Vd3≤35; the Abbe constant of the fourth lens 4 is Vd4, 20≤Vd4≤35; the Abbe constant of the fifth lens 5 is Vd5, 45≤Vd5≤70; the Abbe constant of the sixth lens 6 is Vd6, 30≤Vd6≤55; and the Abbe constant of the seventh lens 7 is Vd7, 50≤Vd7≤70.

[0064] Similarly, it is understood that the present invention does not limit the specific values ​​of the Abbe constants 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. In the present invention, the Abbe constants 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 can all be set to any value within the corresponding range. It is only necessary to ensure that the Abbe constants of the seven lenses are coordinated to guarantee the low chromatic aberration of the vehicle lens 100. In actual settings, they can also be selected according to requirements.

[0065] Furthermore, in one embodiment of the present invention, the distance between the center of the image-side surface of the seventh lens 7 and the image plane 11 (i.e., the back focal length of the vehicle lens 100) is BFL, and the distance between the center of the object-side surface of the first lens 1 and the image plane 11 (i.e., the total optical length of the vehicle lens 100) is TTL, with BFL / TTL > 0.08. This arrangement ensures the compactness of the vehicle lens 100.

[0066] In another embodiment of the present invention, the maximum field of view of the vehicle-mounted lens 100 is FOV, and the corresponding image height is h, where 55 ≤ (FOV × f) / h ≤ 70. This setting ensures the imaging quality and image sharpness of the vehicle-mounted lens 100.

[0067] It should be noted that in this invention, h≤10mm, thus ensuring the maximum image plane 11 of the vehicle-mounted lens 100, enabling the vehicle-mounted lens 100 to achieve an imaging diameter of 10mm.

[0068] It should also be noted that, to further improve the imaging quality of the vehicle-mounted lens 100, in one embodiment of the present invention, the vehicle-mounted lens 100 further includes an aperture stop 8, which is disposed between the third lens 3 and the fourth lens 4. Thus, the aperture stop 8 can effectively control the light transmission aperture, thereby reducing stray light interference and improving imaging quality.

[0069] To improve the imaging accuracy of the vehicle-mounted lens 100 and its protection of the image plane 11, in another embodiment of the present invention, the vehicle-mounted lens 100 further includes a beam-splitting glass 9 and a protective glass 10 arranged sequentially from the object side to the image side along the optical axis. Both the beam-splitting glass 9 and the protective glass 10 are disposed between the seventh lens 7 and the image plane 11. With this arrangement, light rays entering the vehicle-mounted lens 100 exit from the seventh lens 7, then sequentially pass through the beam-splitting glass 9 and the protective glass 10, and finally reach the image plane 11 for imaging, thereby achieving imaging by the vehicle-mounted lens 100. Furthermore, the protective glass 10 provides effective protection for the image plane 11.

[0070] This invention provides a specific embodiment of the vehicle-mounted lens 100. In this embodiment, the vehicle-mounted lens 100 includes a first lens 1, a second lens 2, a third lens 3, an aperture stop 8, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, a beam-splitting glass 9, a protective glass 10, and an image plane 11, arranged sequentially from the object side to the image side along the optical axis. The image side and object side of the beam-splitting glass 9 and the protective glass 10 are both planar. The first lens 1 has a negative optical power, and its object side 1 and image side 2 are both concave. The second lens 2 has a positive optical power, and its object side 3 is convex, and its image side 4 is concave. The third lens 3 has a positive optical power, and its object-side surface 5 is convex, while its image-side surface 6 is concave. The fourth lens 4 has a negative optical power, and its object-side surface 8 is concave, while its image-side surface 9 is concave. The fifth lens 5 has a positive optical power, and its object-side surface 9 is convex, while its image-side surface 10 is convex. The sixth lens 6 has a positive optical power, and its object-side surface 11 is convex, while its image-side surface 12 is concave. The seventh lens 7 has a negative optical power, and its object-side surface 13 is concave, while its image-side surface 14 is concave. The aperture number of the vehicle-mounted lens 100 is FNO, FON = 1.6.

[0071] In this embodiment, the basic parameters of each lens of the vehicle-mounted lens 100, including surface type, radius of curvature (mm), thickness (mm), material properties, and Conic value, are shown in Table 1:

[0072] Table 1

[0073]

[0074] Furthermore, in this embodiment, the aspherical surface shape of the aspherical lens satisfies the following condition:

[0075]

[0076] Where Z represents the distance of the surface from the vertex of the surface in the optical axis direction, parameter c is the curvature corresponding to the radius, y is the radial coordinate, and its unit is the same as the lens length unit, k is the conic quadratic coefficient; when the coefficient k is less than -1, the surface curve of the lens is a hyperbola, when the coefficient k is equal to -1, the surface curve of the lens is a parabola; when the coefficient k is between -1 and 0, the surface curve of the lens is an ellipse, when the coefficient k is equal to 0, the surface curve of the lens is a circle, when the coefficient k is greater than 0, the surface curve of the lens is an oval, and α1 to α8 represent the coefficients corresponding to each radial coordinate.

[0077] In this embodiment, the coefficients of the higher-order terms of each aspherical mirror are shown in Table 2 below:

[0078] Table 2

[0079] # a1 a2 a3 a4 a5 a6 a7 a8 2 0 -2.31E-05 1.35E-07 -4.92E-09 0 0 0 3 0 4.07E-05 3.00E-07 9.93E-10 0 0 0 13 0 -2.86E-03 9.99E-05 -1.16E-06 0 0 0 14 0 -1.34E-03 6.27E-05 -3.23E-07 0 0 0

[0080] It is understandable that number 3 is the object side of the second lens 2, number 4 is the image side of the second lens 2, number 13 is the object side of the seventh lens 7, and number 14 is the image side of the seventh lens 7.

[0081] This setup, by rationally allocating the lens power and adjusting the glass shape and material combination, effectively eliminates chromatic aberration and secondary spectrum, allowing spherical aberration, coma, astigmatism, etc. on each lens to compensate and cancel each other out, thereby achieving a clear imaging effect and realizing optimal correction of higher-order aberrations and chromatic aberration.

[0082] It should be noted that Table 2 is a design value of the aspherical coefficient of the lens in the vehicle lens 100 described in this embodiment. The specific value of the aspherical coefficient design value can be adjusted according to the needs of the product, and the present invention does not limit it.

[0083] Furthermore, in this embodiment, the dot diagram of the first embodiment of the vehicle-mounted lens 100 is as follows: Figure 2 As shown; a schematic diagram of the light aberrations of the first embodiment of the vehicle-mounted lens 100 is shown below. Figure 3 As shown.

[0084] Please see Figure 4The present invention also proposes a vehicle-mounted lens 100. In a second embodiment of the present invention, the vehicle-mounted lens 100 includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, and an image plane 11 arranged sequentially from the object side to the image side along the optical axis. The first lens 1, the third lens 3, the fourth lens 4, the fifth lens 5, and the sixth lens 6 are all glass lenses. The second lens 2 and the seventh lens 7 are glass aspherical lenses. The fourth lens 4 and the fifth lens 5 are cemented together. The vehicle-mounted lens 100 satisfies the following conditions: The following conditions apply: -4.0≤f1 / f≤0.5, -0.5≤f2 / f≤3.5, 0.5≤f3 / f≤2.5, -1.5≤f4 / f≤1.5, -0.5≤f5 / f≤2.0, -0.5≤f6 / f≤3.0, -2.5≤f7 / f≤2.5; the focal length of the vehicle-mounted lens 100 is f, the focal length of the first lens 1 is f1, the focal length of the second lens 2 is f2, the focal length of the third lens 3 is f3, the focal length of the fourth lens 4 is f4, the focal length of the fifth lens 5 is f5, the focal length of the sixth lens 6 is f6, and the focal length of the seventh lens 7 is f7.

[0085] In the technical solution of the present invention, as described in the first embodiment of the vehicle-mounted lens 100, the light collected by the vehicle-mounted lens 100 is sequentially incident on 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 to illuminate the image plane 11 for imaging. At this time, 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 are all configured as glass lenses, thus enabling... The aforementioned lenses possess excellent resistance to thermal deformation, reducing the impact of temperature on the vehicle-mounted lens 100 and enabling it to exhibit good thermal distortion performance. Simultaneously, by setting the second lens 2 and the seventh lens 7 as aspherical lenses, both lenses achieve better radius of curvature characteristics, improving distortion aberrations and astigmatism. Using aspherical lenses minimizes aberrations during imaging, enhancing edge image quality and thus improving the overall image quality of the lens. With this configuration, by combining materials and allocating surface shapes for the multiple lenses of the vehicle-mounted lens 100, and by rationally controlling 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, the resolution of the vehicle-mounted lens 100 can reach eight megapixels. Furthermore, the vehicle-mounted lens 100 possesses characteristics of high illumination, low distortion, clear imaging, and high fidelity. Moreover, since all lenses are glass lenses, the vehicle-mounted lens 100 has good temperature adaptability and can be used in environments with large temperature differences.

[0086] As can be understood, as described in the first embodiment of the vehicle-mounted lens 100, in this invention, when light enters the vehicle-mounted lens 100, the light first enters the first lens 1. At this time, since the first lens 1 is a glass lens, the deformation of the first lens 1 due to heat is small. Thus, the heat of the incident light can be reduced to reduce the impact of the heat of the incident light on the imaging of the optical lens. Afterward, the light enters 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 in sequence. At this time, the multiple glass lenses can reduce the impact of the heat of the incident light on the imaging of the optical lens by their own good resistance to heat deformation, thereby ensuring the imaging quality of the vehicle-mounted lens 100.

[0087] It should be noted that, as described in the first embodiment of the vehicle-mounted lens 100, the present invention does not limit the specific values ​​of 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. In the present invention, 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 can all be set to any value within the corresponding range. It is only necessary to ensure that the focal lengths of the seven lenses are coordinated to guarantee the imaging quality of the vehicle-mounted lens 100. In actual settings, they can be selected according to requirements, and the present invention does not impose any restrictions on this.

[0088] It should also be noted that, as described in the first embodiment of the vehicle-mounted lens 100, in this invention, by bonding the fourth lens 4 and the fifth lens 5 together, light energy loss can be further reduced, thereby increasing image clarity, protecting the scale surface, and optimizing the processing flow to meet design requirements. By using the bonding component appropriately, the optical components can improve the image quality of the vehicle-mounted lens 100. Furthermore, by bonding the two lenses together, the chromatic aberration of the vehicle-mounted lens 100 can be further corrected, thereby improving the color saturation of the image captured by the vehicle-mounted lens 100.

[0089] Further, in one embodiment of the present invention, the refractive index of the first lens 1 is Nd1, 1.50≤Nd1≤1.75; the refractive index of the second lens 2 is Nd2, 1.60≤Nd2≤1.8; the refractive index of the third lens 3 is Nd3, 1.35≤Nd3≤1.65; the refractive index of the fourth lens 4 is Nd4, 1.60≤Nd4≤1.85; the refractive index of the fifth lens 5 is Nd5, 1.45≤Nd5≤1.75; the refractive index of the sixth lens 6 is Nd6, 1.80≤Nd6≤2.00; and the refractive index of the seventh lens 7 is Nd7, 1.55≤Nd7≤1.85.

[0090] It is understood that, as described in the first embodiment of the vehicle-mounted lens 100, the present invention does not limit the specific values ​​of the refractive indices 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. In the present invention, the refractive indices 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 can all be set to any value within the corresponding range. It is only necessary to ensure that the refractive indices of the seven lenses are matched to guarantee the forming quality of the vehicle-mounted lens 100. In actual settings, they can be selected according to requirements.

[0091] Furthermore, in another embodiment of the present invention, the Abbe constant of the first lens 1 is Vd1, 25≤Vd1≤45; the Abbe constant of the second lens 2 is Vd2, 45≤Vd2≤60; the Abbe constant of the third lens 3 is Vd3, 75≤Vd3≤95; the Abbe constant of the fourth lens 4 is Vd4, 20≤Vd4≤40; the Abbe constant of the fifth lens 5 is Vd5, 50≤Vd5≤75; the Abbe constant of the sixth lens 6 is Vd6, 25≤Vd6≤50; and the Abbe constant of the seventh lens 7 is Vd7, 45≤Vd7≤70.

[0092] Similarly, as described in the first embodiment of the vehicle-mounted lens 100, this invention does not limit the specific values ​​of the Abbe constants 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. In this invention, the Abbe constants 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 can all be set to any value within the corresponding range. It is only necessary to ensure that the Abbe constants of the seven lenses are coordinated to guarantee the low chromatic aberration of the vehicle-mounted lens 100. In actual settings, they can also be selected according to requirements.

[0093] Furthermore, in one embodiment of the present invention, the distance between the center of the image-side surface of the seventh lens 7 and the image plane 11 (i.e., the back focal length of the vehicle lens 100) is BFL, and the distance between the center of the object-side surface of the first lens 1 and the image plane 11 (i.e., the total optical length of the vehicle lens 100) is TTL, with BFL / TTL > 0.08. This configuration, as described in the first embodiment of the vehicle lens 100, ensures the compactness of the vehicle lens 100.

[0094] In another embodiment of the present invention, the maximum field of view of the vehicle-mounted lens 100 is FOV, and the corresponding image height is h, where 55 ≤ (FOV × f) / h ≤ 70. This setting ensures the imaging quality and image sharpness of the vehicle-mounted lens 100.

[0095] It should be noted that in this invention, h≤10mm, thus ensuring the maximum image plane 11 of the vehicle-mounted lens 100, enabling the vehicle-mounted lens 100 to achieve an imaging diameter of 10mm.

[0096] It should also be noted that, to further improve the imaging quality of the vehicle-mounted lens 100, in one embodiment of the present invention, the vehicle-mounted lens 100 further includes an aperture stop 8, which is disposed between the first lens 1 and the second lens 2. Thus, the aperture stop 8 can effectively control the light transmission aperture, thereby reducing stray light interference and improving imaging quality.

[0097] To enhance protection of the image plane 11, in another embodiment of the present invention, the vehicle-mounted lens 100 further includes a protective glass 10 disposed between the seventh lens 7 and the image plane 11. Thus, the protective glass 10 provides effective protection for the image plane 11.

[0098] The present invention provides a specific embodiment of the vehicle-mounted lens 100. In this embodiment, the vehicle-mounted lens 100 includes a first lens 1, a second lens 2, a third lens 3, an aperture 8, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, a protective glass 10, and an image plane 11 arranged sequentially from the object side to the image side along the optical axis. The image side and the object side of the protective glass 10 are both planar. The optical power of the first lens 1 is negative, and the object side 1 of the first lens 1 is concave and the image side 2 is convex.

[0099] The second lens 2 has a positive optical power, and its object-side surface 4 and image-side surface 5 are convex. The third lens 3 has a positive optical power, and its object-side surface 6 and image-side surface 7 are convex. The fourth lens 4 has a negative optical power, and its object-side surface 8 and image-side surface 9 are concave. The fifth lens 5 has a positive optical power, and its object-side surface 9 and image-side surface 10 are convex. The sixth lens 6 has a positive optical power, and its object-side surface 11 and image-side surface 12 are convex. The seventh lens 7 has a negative optical power, and its object-side surface 13 and image-side surface 14 are concave. The aperture number of the vehicle-mounted lens 100 is FNO, FON = 1.6.

[0100] In this embodiment, the basic parameters of each lens of the vehicle-mounted lens 100, including surface type, radius of curvature (mm), thickness (mm), material properties, and Conic value, are shown in Table 3:

[0101] Table 3

[0102]

[0103] Furthermore, in this embodiment, the aspherical surface shape of the aspherical lens satisfies the following condition:

[0104]

[0105] Where Z represents the distance of the surface from the vertex of the surface in the optical axis direction, parameter c is the curvature corresponding to the radius, y is the radial coordinate, and its unit is the same as the lens length unit, k is the conic quadratic coefficient; when the coefficient k is less than -1, the surface curve of the lens is a hyperbola, when the coefficient k is equal to -1, the surface curve of the lens is a parabola; when the coefficient k is between -1 and 0, the surface curve of the lens is an ellipse, when the coefficient k is equal to 0, the surface curve of the lens is a circle, when the coefficient k is greater than 0, the surface curve of the lens is an oval, and α1 to α8 represent the coefficients corresponding to each radial coordinate.

[0106] In this embodiment, the coefficients of the higher-order terms of each aspherical mirror are shown in Table 4 below:

[0107] Table 4

[0108] # a1 a2 a3 a4 a5 a6 a7 a8 2 0 -4.66E-06 -1.64E-07 -9.68E-09 0 0 0 3 0 3.07E-05 -1.03E-07 -8.08E-10 0 0 0 13 0 -3.11E-04 3.46E-09 -7.65E-08 0 0 0 14 0 -1.32E-04 -7.97E-06 -1.65E-08 0 0 0

[0109] It is understandable that number 3 is the object side of the second lens 2, number 4 is the image side of the second lens 2, number 13 is the object side of the seventh lens 7, and number 14 is the image side of the seventh lens 7.

[0110] This setup, by rationally allocating the lens power and adjusting the glass shape and material combination, effectively eliminates chromatic aberration and secondary spectrum, allowing spherical aberration, coma, astigmatism, etc. on each lens to compensate and cancel each other out, thereby achieving a clear imaging effect and realizing optimal correction of higher-order aberrations and chromatic aberration.

[0111] It should be noted that Table 4 shows one design value for the aspherical coefficient of the lens in the vehicle-mounted lens 100 described in this embodiment. The specific value of the aspherical coefficient design can be adjusted according to the product requirements, and this invention does not impose any restrictions on it.

[0112] Furthermore, in this embodiment, the dot diagram of the first embodiment of the vehicle-mounted lens 100 is as follows: Figure 5 As shown; a schematic diagram of the light aberrations of the first embodiment of the vehicle-mounted lens 100 is shown below. Figure 6As shown.

[0113] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A vehicle-mounted lens, characterized in that, The vehicle-mounted lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an image plane, arranged sequentially from the object side to the image side along the optical axis. The first lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all spherical glass lenses, while the second lens and the seventh lens are aspherical glass lenses. The fourth lens and the fifth lens are cemented together. The vehicle-mounted lens satisfies the following conditions: -4.0≤f1 / f≤0.5, -0.5≤f2 / f≤3.5, 0.5≤f3 / f≤2.5, -1.5≤f4 / f≤1.5, -0.5≤f5 / f≤2.0, -0.5≤f6 / f≤3.0, -2.5≤f7 / f≤2.5; Wherein, the focal length of the vehicle-mounted lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, and the focal length of the seventh lens is f7.

2. The vehicle-mounted lens as described in claim 1, characterized in that, The first lens has a negative optical power, and the object side and the image side of the first lens are both concave. The second lens has a positive optical power, and both the object side and the image side of the second lens are convex. The third lens has a positive optical power, and the object side of the third lens is convex, while the image side is concave. The fourth lens has a negative optical power, and the object side and image side of the fourth lens are both concave. The fifth lens has a positive optical power, and both the object side and the image side of the fifth lens are convex. The sixth lens has a positive optical power, and the object side of the sixth lens is convex, while the image side is concave. The seventh lens has a negative optical power, and both the object side and the image side of the seventh lens are concave.

3. The vehicle-mounted lens as described in claim 2, characterized in that, The refractive index of the first lens is Nd1, and the Abbe constant of the first lens is Vd1, where 1.75≤Nd1≤1.95 and 25≤Vd1≤40. The refractive index of the second lens is Nd2, and the Abbe constant of the second lens is Vd2, where 1.55≤Nd2≤1.80 and 45≤Vd2≤60. The refractive index of the third lens is Nd3, and the Abbe constant of the third lens is Vd3, where 1.70≤Nd3≤1.90 and 20≤Vd3≤35. The refractive index of the fourth lens is Nd4, and the Abbe constant of the fourth lens is Vd4, where 1.60≤Nd4≤1.90 and 20≤Vd4≤35. The refractive index of the fifth lens is Nd5, and the Abbe constant of the fifth lens is Vd5, where 1.60≤Nd5≤1.85 and 45≤Vd5≤70. The refractive index of the sixth lens is Nd6, and the Abbe constant of the sixth lens is Vd6, where 1.70≤Nd6≤1.95 and 30≤Vd6≤55. The refractive index of the seventh lens is Nd7, and the Abbe constant of the seventh lens is Vd7, where 1.50≤Nd7≤1.75 and 50≤Vd7≤70.

4. The vehicle-mounted lens as described in claim 2, characterized in that, The vehicle-mounted lens also includes an aperture stop, which is located between the third lens and the fourth lens.

5. The vehicle-mounted lens as described in claim 1, characterized in that, The first lens has a negative optical power, and the object side of the first lens is concave, while the image side is convex. The second lens has a positive optical power, and both the object side and the image side of the second lens are convex. The third lens has a positive optical power, and both the object side and the image side of the third lens are convex. The fourth lens has a negative optical power, and the object side and image side of the fourth lens are both concave. The fifth lens has a positive optical power, and both the object side and the image side of the fifth lens are convex. The sixth lens has a positive optical power, and the object side of the sixth lens is convex, while the image side is concave. The seventh lens has a negative optical power, and both the object side and the image side of the seventh lens are concave.

6. The vehicle-mounted lens as described in claim 5, characterized in that, The refractive index of the first lens is Nd1, and the Abbe constant of the first lens is Vd1, where 1.50≤Nd1≤1.75 and 25≤Vd1≤45. The refractive index of the second lens is Nd2, and the Abbe constant of the second lens is Vd2, where 1.60≤Nd2≤1.80 and 45≤Vd2≤60. The refractive index of the third lens is Nd3, and the Abbe constant of the third lens is Vd3, where 1.35≤Nd3≤1.65 and 75≤Vd3≤95. The refractive index of the fourth lens is Nd4, and the Abbe constant of the fourth lens is Vd4, where 1.60≤Nd4≤1.85 and 20≤Vd4≤40. The refractive index of the fifth lens is Nd5, and the Abbe constant of the fifth lens is Vd5, where 1.45≤Nd5≤1.75 and 50≤Vd5≤75. The refractive index of the sixth lens is Nd6, and the Abbe constant of the sixth lens is Vd6, where 1.80≤Nd6≤2.00 and 25≤Vd6≤50. The refractive index of the seventh lens is Nd7, and the Abbe constant of the seventh lens is Vd7, where 1.55≤Nd7≤1.85 and 45≤Vd7≤70.

7. The vehicle-mounted lens as described in claim 5, characterized in that, The vehicle-mounted lens also includes an aperture stop, which is disposed between the first lens and the second lens.

8. The vehicle-mounted lens as described in any one of claims 2-6, characterized in that, The distance between the center of the image side surface of the seventh lens and the image surface is BFL, and the distance between the center of the object side surface of the first lens and the image surface is TTL, where BFL / TTL > 0.

08.

9. The vehicle-mounted lens as described in any one of claims 2-6, characterized in that, The maximum field of view of the vehicle-mounted lens is FOV, and the corresponding image height is h, where 55≤(FOV×f) / h≤70.

10. The vehicle-mounted lens as described in claim 1, characterized in that, The vehicle-mounted lens further includes an aperture stop, which is disposed between the first lens and the second lens; and / or The vehicle-mounted lens also includes a protective glass, which is disposed between the seventh lens and the image plane.

Images