Vehicle-mounted lens

Abstract

The utility model discloses a vehicle-mounted lens. The vehicle-mounted lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object plane to an image plane along an optical axis. The first lens has negative focal power, the second lens has negative focal power, the third lens has positive focal power, and the fourth lens has positive focal power; and the fifth lens and the sixth lens are glued and fixed to form a glued lens group, and the glued lens group has positive focal power or negative focal power. By reasonably designing the relative position and focal power of each lens, the vehicle-mounted lens meets the imaging requirements of high image quality and low aberration under the condition that the vehicle-mounted lens is small in size.

Description

Technical Field

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

[0002] Automotive intelligence is one of the key directions for future industry development. As the eyes of automotive intelligence, in-vehicle cameras provide drivers with content and services during driving, improving driving safety, comfort, and convenience. As a crucial component of in-vehicle cameras, side-view cameras place great emphasis on optical performance, continuously striving for higher precision, greater adaptability, miniaturization, and intelligence. However, current in-vehicle cameras, while pursuing miniaturization, suffer from significant overall lens aberrations, hindering the achievement of high-quality imaging. Utility Model Content

[0003] This invention provides a vehicle-mounted lens that meets the imaging requirements of low aberration and high image quality while maintaining a small size.

[0004] This utility model provides a vehicle-mounted lens, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object plane to the image plane;

[0005] The first lens has negative optical power, the second lens has negative optical power, the third lens has positive optical power, and the fourth lens has positive optical power; the fifth lens and the sixth lens are cemented together to form a cemented lens group, which has either positive or negative optical power.

[0006] Optionally, the surface of the lens adjacent to the object plane is the object-side surface, and the surface of the lens adjacent to the image plane is the image-side surface; the image-side surface of the first lens convexes towards the object plane; the object-side surface of the second lens convexes towards the object plane, and the image-side surface of the second lens convexes towards the object plane; the object-side surface of the third lens convexes towards the object plane; the image-side surface of the fourth lens is recessed towards the object plane; the object-side surface of the fifth lens convexes towards the object plane, and the image-side surface of the fifth lens is recessed towards the object plane; the object-side surface of the sixth lens is recessed towards the object plane, and the image-side surface of the sixth lens is recessed towards the object plane.

[0007] Optionally, the first lens is a meniscus lens.

[0008] Optionally, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all glass spherical lenses.

[0009] Optionally, the refractive index of the first lens is Nd1, the refractive index of the second lens is Nd2, the refractive index of the third lens is Nd3, the refractive index of the fourth lens is Nd4, the refractive index of the fifth lens is Nd5, and the refractive index of the sixth lens is Nd6, wherein 1.47≤Nd1≤2.01; 1.39≤Nd2≤1.69; 1.82≤Nd3≤2.05; 1.67≤Nd4≤1.92; 1.49≤Nd5≤1.72; and 1.85≤Nd6≤2.00.

[0010] Optionally, the Abbe number of the first lens is Vd1, the Abbe number of the second lens is Vd2, the Abbe number of the third lens is Vd3, the Abbe number of the fourth lens is Vd4, the Abbe number of the fifth lens is Vd5, and the Abbe number of the sixth lens is Vd6, wherein 34.30≤Vd1≤64.00; 60.30≤Vd2≤72.40; 16.20≤Vd3≤26.40; 45.60≤Vd4≤50.60; 62.40≤Vd5≤69.30; and 16.90≤Vd6≤33.30.

[0011] Optionally, the distance from the optical axis center of the image side of the sixth lens to the image plane is BFL, and the distance from the optical axis center of the object side of the first lens to the image plane is TTL, wherein BFL / TTL≥0.284.

[0012] Optionally, the field of view of the vehicle-mounted lens is FOV, and the distance from the center of the optical axis on the object side of the first lens to the image plane is TTL, wherein FOV / TTL ≥ 4.75.

[0013] Optionally, the vehicle-mounted camera may also include an aperture stop;

[0014] The aperture is located in the optical path between the third lens and the fourth lens.

[0015] Optionally, the vehicle-mounted lens may also include a filter;

[0016] The filter is located on the image-side side of the sixth lens.

[0017] The technical solution of this utility model embodiment provides a vehicle-mounted lens, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object plane to the image plane. The first lens has negative optical power, the second lens has negative optical power, the third lens has positive optical power, and the fourth lens has positive optical power. The fifth and sixth lenses are cemented together to form a cemented lens assembly, which has either positive or negative optical power. By rationally designing the relative positions and optical powers of each lens, the vehicle-mounted lens can meet the imaging requirements of high image quality and low aberration within a small volume.

[0018] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This invention provides a schematic diagram of the structure of a vehicle-mounted lens according to an embodiment of the present invention;

[0021] Figure 2 A lateral optical fan pattern for a vehicle-mounted lens provided in Embodiment 1 of this utility model;

[0022] Figure 3 This invention provides a field curvature distortion curve diagram of a vehicle-mounted lens for Embodiment 1 of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of a vehicle-mounted lens provided in Embodiment 2 of this utility model;

[0024] Figure 5 A lateral optical fan pattern for a vehicle-mounted lens provided in Embodiment 2 of this utility model;

[0025] Figure 6 This invention provides a field curvature distortion curve diagram for a vehicle-mounted lens in Embodiment 2 of the present invention.

[0026] Figure 7 This is a schematic diagram of the structure of a vehicle-mounted lens provided in Embodiment 3 of this utility model;

[0027] Figure 8 A lateral optical fan pattern for a vehicle-mounted lens provided in Embodiment 3 of this utility model;

[0028] Figure 9 This invention provides a field curvature distortion curve of a vehicle-mounted lens in Embodiment 3 of the present invention. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] Figure 1 This invention provides a structural schematic diagram of a vehicle-mounted lens according to an embodiment of the present invention, as shown below. Figure 1 As shown, the vehicle-mounted lens includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, and a sixth lens 106 arranged sequentially along the optical axis from the object plane to the image plane; the first lens 101 has negative optical power, the second lens 102 has negative optical power, the third lens 103 has positive optical power, and the fourth lens 104 has positive optical power; the fifth lens 105 and the sixth lens 106 are cemented together to form a cemented lens group, which has either positive or negative optical power.

[0032] For example, optical power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam, characterizing the ability of an optical system to deflect light. The larger the absolute value of the optical power, the stronger the bending ability of light; the smaller the absolute value, the weaker the bending ability. When the optical power is positive, the refraction of light is converging; when the optical power is negative, the refraction of light is diverging. Optical power can be used to characterize a single refractive surface of a lens (i.e., a surface of the lens), a single lens, or a system formed by multiple lenses (i.e., a lens group). The first lens 101 and the second lens 102 are negative optical power lenses used to control the angle of incidence of light in the optical system, helping to mitigate large angles of incidence and ensuring a large field of view; the optical power settings of the third lens 103 and the fourth lens 104 effectively correct chromatic aberration, which is beneficial to improving the optical performance of the system. By cementing and fixing the fifth lens and the sixth lens 106 together to form a cemented lens group, the cemented lens group, which has either positive or negative optical power, can effectively reduce the air gap between the fifth lens and the sixth lens 106, thereby further reducing the overall length of the lens. Furthermore, the cemented lens group can minimize or eliminate chromatic aberration, allowing various aberrations in the automotive lens to be fully corrected. Under the premise of a compact structure, it can improve resolution, optimize optical performance such as distortion, and reduce light loss caused by reflections between lenses, thereby improving illumination and ultimately improving image quality and the sharpness of the lens image. In addition, the use of a cemented lens group can reduce the number of assembly components between lenses, simplify the assembly process in lens manufacturing, reduce costs, and reduce tolerance sensitivity issues such as tilting / eccentricity of lens units during assembly.

[0033] Optionally, the surface of the lens adjacent to the object plane is called the object-side surface, and the surface of the lens adjacent to the image plane is called the image-side surface; the image-side surface of the first lens 101 convexes towards the object plane; the object-side surface of the second lens 102 convexes towards the object plane, and the image-side surface of the second lens 102 convexes towards the object plane; the object-side surface of the third lens 103 convexes towards the object plane; the image-side surface of the fourth lens 104 is concave towards the object plane; the object-side surface of the fifth lens 105 convexes towards the object plane, and the image-side surface of the fifth lens 105 is concave towards the object plane; the object-side surface of the sixth lens 106 is concave towards the object plane, and the image-side surface of the sixth lens 106 is concave towards the object plane. For example... Figure 1As shown, the object-side surface of the first lens 101 convexes towards the object plane, and the image-side surface of the first lens 101 also convexes towards the object plane; the object-side surface of the third lens 103 convexes towards the object plane, and the image-side surface of the third lens 103 also convexes towards the object plane; the object-side surface of the fourth lens 104 is flat, and the image-side surface of the fourth lens 104 is concave towards the object plane. Both the first lens 101 and the second lens 102 are meniscus lenses, which allow light to enter the optical system more effectively, ensuring smooth propagation without excessive deflection and thus preventing the introduction of greater aberrations. By rationally setting the surface shape of some lenses, the optical power of each lens meets the requirements of the above embodiments, while also ensuring a compact structure and high integration of the entire vehicle-mounted lens.

[0034] Optionally, the first lens 101 is a meniscus lens. For example... Figure 1 As shown, the object-side surface of the first lens 101 convexes towards the object surface, which allows light to enter the optical system more effectively and ensures smooth propagation without excessive refraction, thus preventing the introduction of greater aberrations. Simultaneously, it helps to reduce the lens aperture and overall length. Furthermore, the first lens 101 can also be a biconcave lens, such as... Figure 7 As shown, by reasonably setting the surface shape of the first lens 101, the incident light can be adjusted, aberrations can be effectively corrected, and the overall performance of the system can be improved.

[0035] Optionally, the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105 and the sixth lens 106 are all glass spherical lenses.

[0036] Specifically, spherical lenses are characterized by a constant curvature from the center to the periphery, ensuring a simple lens configuration. Furthermore, due to the low coefficient of thermal expansion and good stability of glass lenses, it is possible to design the first lens 101, second lens 102, third lens 103, fourth lens 104, fifth lens 105, and sixth lens 106 as glass spherical lenses. The thermal properties of glass spherical lenses are more stable, ensuring good resolving power over a wide temperature range when handling higher optical powers. In addition, compared to plastic aspherical lenses, glass offers a wider range of material choices, with more freedom in selecting refractive index and Abbe number. This allows for better control over higher aberrations and chromatic aberrations, meeting the needs of use under complex conditions.

[0037] Optionally, the refractive index of the first lens 101 is Nd1, the refractive index of the second lens 102 is Nd2, the refractive index of the third lens 103 is Nd3, the refractive index of the fourth lens 104 is Nd4, the refractive index of the fifth lens 105 is Nd5, and the refractive index of the sixth lens 106 is Nd6, wherein 1.47≤Nd1≤2.01; 1.39≤Nd2≤1.69; 1.82≤Nd3≤2.05; 1.67≤Nd4≤1.92; 1.49≤Nd5≤1.72; and 1.85≤Nd6≤2.00.

[0038] Refractive index, the ratio of the speed of light in a vacuum to the speed of light in a medium, is mainly used to describe a material's ability to refract light; different materials have different refractive indices. By combining different lenses and rationally allocating their refractive indices, the vehicle-mounted lens achieves performance such as low cost, high pixel count, and clear imaging even in low-light environments. By limiting Nd1 to 2.01 (1.47 ≤ Nd1 ≤ 2.01), light from a wider field of view can be effectively converged, reducing the aperture of the first lens 1011 and facilitating the miniaturization of the optical lens.

[0039] Optionally, the Abbe number of the first lens 101 is Vd1, the Abbe number of the second lens 102 is Vd2, the Abbe number of the third lens 103 is Vd3, the Abbe number of the fourth lens 104 is Vd4, the Abbe number of the fifth lens 105 is Vd5, and the Abbe number of the sixth lens 106 is Vd6, wherein 34.30≤Vd1≤64.00; 60.30≤Vd2≤72.40; 16.20≤Vd3≤26.40; 45.60≤Vd4≤50.60; 62.40≤Vd5≤69.30; and 16.90≤Vd6≤33.30.

[0040] Abbe number is an index used to represent the dispersion capability of a transparent medium. The more severe the dispersion of the medium, the smaller the Abbe number; conversely, the less severe the dispersion of the medium, the larger the Abbe number. Thus, by adjusting the refractive index and Abbe number of each lens in the vehicle-mounted imaging lens, system aberrations can be corrected, and miniaturization design for vehicle use can be achieved.

[0041] Optionally, the distance from the optical axis center of the image side of the sixth lens 106 to the image plane is BFL, and the distance from the optical axis center of the object side of the first lens 101 to the image plane is TTL, wherein BFL / TTL≥0.284.

[0042] For example, the distance from the optical axis center on the image side of the sixth lens 106 to the image plane can be understood as the back focal length of the vehicle-mounted lens. By reasonably setting the relationship between the back focal length and the total length of the vehicle-mounted lens, the entire vehicle-mounted lens structure can be ensured to be compact and highly integrated. When the vehicle-mounted lens meets this condition, it can ensure that the imaging sensor and the flat panel filter 10 have sufficient installation space.

[0043] Optionally, the field of view of the vehicle-mounted lens is FOV, and the distance from the center of the optical axis on the object side of the first lens 101 to the image plane is TTL, wherein FOV / TTL ≥ 4.75. By limiting FOV / TTL within a reasonable range, the length of the optical lens can be effectively limited under the same field of view, which is beneficial to the miniaturization of the vehicle-mounted lens.

[0044] Optionally, the vehicle-mounted lens also includes an aperture STO; the aperture STO is located in the optical path between the third lens 103 and the fourth lens 104.

[0045] The addition of an aperture stop STO allows for adjustment of the beam propagation direction, which is beneficial for improving image quality. The aperture stop STO can be located in the optical path between the third lens 103 and the fourth lens 104, but this embodiment of the invention does not limit the specific location of the aperture stop STO.

[0046] Optionally, the vehicle-mounted lens also includes a filter 10; the filter 10 is located on the image-side side of the sixth lens 106.

[0047] By providing a filter 10 on the image side of the sixth lens 106, unwanted stray light can be filtered out, thereby improving the image quality of the vehicle lens. For example, the image quality of the vehicle lens can be improved by filtering out infrared light during the day using the filter 10.

[0048] Optionally, a chip protection glass 11 is also provided along the object plane to the image plane; the chip protection glass 11 is located on the image side of the filter 10. By providing the chip protection glass 11 on the image side of the filter 10, the photosensitive chip in the imaging sensor is protected, wherein the imaging chip is used to convert the light signal collected by the vehicle lens into an electrical signal, thereby ensuring the imaging effect of the vehicle lens.

[0049] Therefore, this utility model embodiment uses six lenses. By rationally allocating the lens surface shape, optical power, and relative positions between the lenses, and employing an all-glass spherical combination, it can effectively correct aberrations, ensure sufficiently good image quality, and provide stable high and low temperature resolution. It can meet the requirements of a large field of view, with a total lens length of less than 21.7mm, an image plane diameter of up to 6.6mm, and an FOV of up to 120°, thus possessing good commercial value.

[0050] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the vehicle-mounted lens applicable to the above-described embodiments.

[0051] Example 1

[0052] Continue to refer to Figure 1The vehicle-mounted lens includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, and a sixth lens 106 arranged sequentially along the optical axis from the object plane to the image plane; the first lens 101 has negative optical power, the second lens 102 has negative optical power, the third lens 103 has positive optical power, and the fourth lens 104 has positive optical power; the fifth lens 105 and the sixth lens 106 are cemented together to form a cemented lens group, which has either positive or negative optical power. The object-side surface of the first lens 101 convexes towards the object plane, and the image-side surface of the first lens 101 also convexes towards the object plane; the object-side surface of the second lens 102 convexes towards the object plane, and the image-side surface of the second lens 102 also convexes towards the object plane; the object-side surface of the third lens 103 convexes towards the object plane, and the image-side surface of the third lens 103 also convexes towards the object plane; the object-side surface of the fourth lens 104 is flat, and the image-side surface of the fourth lens 104 is concave towards the object plane; the object-side surface of the fifth lens 105 convexes towards the object plane, and the image-side surface of the fifth lens 105 is concave towards the object plane; the object-side surface of the sixth lens 106 is concave towards the object plane, and the image-side surface of the sixth lens 106 is concave towards the object plane; the aperture stop STO is located in the optical path between the third lens 103 and the fourth lens 104. Exemplarily, Table 1 details the specific optical physical parameters of each lens in the vehicle-mounted lens provided in Embodiment 1 of this utility model, using a feasible implementation method.

[0053] Table 1 Design values ​​of optical physical parameters for vehicle-mounted lenses

[0054] Face number Surface type radius of curvature thickness Material (Nd) Material (Vd) 1 spherical 61.300 1.050 1.83 42.70 2 spherical 3.732 4.166 3 spherical 10.785 2.003 1.49 70.40 4 spherical 5.624 0.845 5 spherical 6.495 4.002 1.92 20.90 6 spherical 12.493 0.200 STO flat PL 0.100 8 spherical PL 1.380 1.82 46.50 9 spherical -7.878 0.070 10 spherical 9.044 1.845 1.62 63.40 11 spherical -3.965 2.415 1.95 17.90 12 spherical -10.077 1.200 13 flat PL 0.700 1.52 64.20 14 flat PL 5.264

[0055] The surface number is assigned according to the order of the surfaces of each lens. For example, surface number "1" represents the object side of the first lens 101, surface number "2" represents the image side of the first lens 101, and so on. "STO" represents the aperture stop of the lens. The radius of curvature represents the curvature of the lens surface. A positive value means that the surface bends towards the object surface with the center closer to the image surface, and a negative value means that the surface bends towards the image surface with the center closer to the object surface. "PL" means that the surface is flat and the radius of curvature is infinite. The thickness represents the axial distance between the center of the current surface and the next surface. The material (Nd) represents the refractive index, which is the ability of the material between the current surface and the next surface to deflect light. A space indicates that the current position is air and the refractive index is 1. The material (Vd) represents the Abbe number, which is the dispersion characteristic of the material between the current surface and the next surface. A space indicates that the current position is air.

[0056] Figure 2This invention provides a lateral ray fan diagram for a vehicle-mounted lens according to Embodiment 1. The horizontal axis of the ray fan diagram represents the normalized pupil aperture, and the vertical axis represents the distance of the corresponding ray from the principal ray on the image plane. It should be noted that the principal ray is the ray that passes through the center of the entrance pupil. Ideally, each curve completely coincides with the horizontal axis, at which point all rays in the field of view converge at the same point on the image plane. Figure 2 As shown, the curves of the light fan plots for different wavelengths in all fields of view are close to the horizontal axis, and the curves of each color have a high degree of concentration. This indicates that the aberrations of each field of view of the vehicle-mounted lens are well corrected, which can ensure that the vehicle-mounted lens can achieve clear imaging in a wide spectral range.

[0057] Figure 3 This invention provides a field curvature distortion curve diagram for a vehicle-mounted lens in Embodiment 1 of the present invention, as shown below. Figure 3 As shown, in the coordinate system on the left side of the figure, the horizontal coordinate represents the magnitude of the field curvature, in mm; the vertical coordinate represents the normalized image height, which has no unit; where T represents the meridion and S represents the arc loss; from Figure 3 It can be seen that the lens provided in this embodiment effectively controls the field curvature from light with wavelengths from 436nm to 656nm, meaning that during imaging, the difference in image quality between the center and the periphery is small; in the coordinate system on the right, the horizontal axis represents the magnitude of distortion, expressed as a percentage; the vertical axis represents the normalized image height, which has no unit; from Figure 3 As can be seen, the imaging distortion of the lens provided in this embodiment is less than 50%, indicating that the lens distortion has been well corrected and the vehicle-mounted lens has a good imaging effect.

[0058] Example 2

[0059] Figure 4 This is a structural schematic diagram of a vehicle-mounted lens provided in Embodiment 2 of the present invention, as shown below. Figure 4As shown, the vehicle-mounted lens includes a first lens 201, a second lens 202, a third lens 203, a fourth lens 204, a fifth lens 205, and a sixth lens 206 arranged sequentially along the optical axis from the object plane to the image plane; the first lens 201 has negative optical power, the second lens 202 has negative optical power, the third lens 203 has positive optical power, and the fourth lens 204 has positive optical power; the fifth lens 205 and the sixth lens 206 are cemented together to form a cemented lens group, which has either positive or negative optical power. The object-side surface of the first lens 201 convexes towards the object plane, and the image-side surface of the first lens 201 also convexes towards the object plane; the object-side surface of the second lens 202 convexes towards the object plane, and the image-side surface of the second lens 202 also convexes towards the object plane; the object-side surface of the third lens 203 convexes towards the object plane, and the image-side surface of the third lens 203 is flat; the object-side surface of the fourth lens 204 is concave towards the object plane, and the image-side surface of the fourth lens 204 is concave towards the object plane; the object-side surface of the fifth lens 205 convexes towards the object plane, and the image-side surface of the fifth lens 205 is concave towards the object plane; the object-side surface of the sixth lens 206 is concave towards the object plane, and the image-side surface of the sixth lens 206 is concave towards the object plane; the aperture stop STO is located in the optical path between the third lens 203 and the fourth lens 204. Exemplarily, Table 2 details the specific optical physical parameters of each lens in the vehicle-mounted lens provided in Embodiment 2 of this utility model, using a feasible implementation method.

[0060] Table 2 Design values ​​of optical physical parameters for vehicle-mounted lenses

[0061] Face number Surface type radius of curvature thickness Material (Nd) Material (Vd) 1 spherical 83.816 1.201 1.91 35.30 2 spherical 3.554 1.011 3 spherical 6.175 2.002 1.52 64.20 4 spherical 3.894 1.351 5 spherical 7.715 4.014 1.95 17.90 6 spherical PL 0.150 STO flat PL 0.200 8 spherical -24.659 2.222 1.80 46.60 9 spherical -5.646 0.070 10 spherical 10.836 1.407 1.62 63.40 11 spherical -3.905 2.801 1.95 17.90 12 spherical -11.154 1.200 13 flat PL 0.700 1.52 64.40 14 flat PL 5.024

[0062] The surface number is assigned according to the order of the surfaces of each lens. For example, surface number "1" represents the object side of the first lens 201, surface number "2" represents the image side of the first lens 201, and so on. "STO" represents the aperture stop STO of the lens. The radius of curvature represents the curvature of the lens surface. A positive value means that the surface bends towards the object surface with the center closer to the image surface, and a negative value means that the surface bends towards the image surface with the center closer to the object surface. "PL" means that the surface is flat and the radius of curvature is infinite. The thickness represents the axial distance between the center of the current surface and the next surface. The material (Nd) represents the refractive index, which is the ability of the material between the current surface and the next surface to deflect light. A space indicates that the current position is air and the refractive index is 1. The material (Vd) represents the Abbe number, which is the dispersion characteristic of the material between the current surface and the next surface. A space indicates that the current position is air.

[0063] Figure 5This is a lateral ray fan diagram of a vehicle-mounted lens provided in Embodiment 2 of this utility model. The horizontal axis of the ray fan diagram represents the normalized pupil aperture, and the vertical axis represents the distance of the corresponding ray from the principal ray on the image plane. It should be noted that the principal ray is the ray that passes through the center of the entrance pupil. Ideally, each curve completely coincides with the horizontal axis, at which point all rays in the field of view converge at the same point on the image plane. Figure 5 As shown, the curves of the light fan plots for different wavelengths in all fields of view are close to the horizontal axis, and the curves of each color have a high degree of concentration. This indicates that the aberrations of each field of view of the vehicle-mounted lens are well corrected, which can ensure that the vehicle-mounted lens can achieve clear imaging in a wide spectral range.

[0064] Figure 6 This invention provides a field curvature distortion curve diagram for a vehicle-mounted lens in Embodiment 2 of the present invention, as shown below. Figure 6 As shown, in the coordinate system on the left side of the figure, the horizontal coordinate represents the magnitude of the field curvature, in mm; the vertical coordinate represents the normalized image height, which has no unit; where T represents the meridion and S represents the arc loss; from Figure 6 It can be seen that the lens provided in this embodiment effectively controls the field curvature from light with wavelengths from 436nm to 656nm, meaning that during imaging, the difference in image quality between the center and the periphery is small; in the coordinate system on the right, the horizontal axis represents the magnitude of distortion, expressed as a percentage; the vertical axis represents the normalized image height, which has no unit; from Figure 6 As can be seen, the imaging distortion of the lens provided in this embodiment is less than 50%, indicating that the lens distortion has been well corrected and the vehicle-mounted lens has a good imaging effect.

[0065] Example 3

[0066] Figure 7 This is a structural schematic diagram of a vehicle-mounted lens provided in Embodiment 3 of the present invention, as shown below. Figure 7As shown, the vehicle-mounted lens includes a first lens 301, a second lens 302, a third lens 303, a fourth lens 304, a fifth lens 305, and a sixth lens 306 arranged sequentially along the optical axis from the object plane to the image plane; the first lens 301 has negative optical power, the second lens 302 has negative optical power, the third lens 303 has positive optical power, and the fourth lens 304 has positive optical power; the fifth lens 305 and the sixth lens 306 are cemented together to form a cemented lens group, which has either positive or negative optical power. The object-side surface of the first lens 301 is concave towards the object plane, and the image-side surface of the first lens 301 is convex towards the object plane; the object-side surface of the second lens 302 is convex towards the object plane, and the image-side surface of the second lens 302 is convex towards the object plane; the object-side surface of the third lens 303 is convex towards the object plane, and the image-side surface of the third lens 303 is convex towards the object plane; the object-side surface of the fourth lens 304 is convex towards the object plane, and the image-side surface of the fourth lens 304 is concave towards the object plane; the object-side surface of the fifth lens 305 is convex towards the object plane, and the image-side surface of the fifth lens 305 is concave towards the object plane; the object-side surface of the sixth lens 306 is concave towards the object plane, and the image-side surface of the sixth lens 306 is concave towards the object plane; the aperture stop STO is located in the optical path between the third lens 303 and the fourth lens 304. Exemplarily, Table 3 details the specific optical physical parameters of each lens in the vehicle-mounted lens provided in Embodiment 3 of this utility model, using a feasible implementation method.

[0067] Table 3 Design values ​​of optical physical parameters for vehicle-mounted lenses

[0068] Face number Surface type radius of curvature thickness Material (Nd) Material (Vd) 1 spherical -68.619 1.050 1.57 63.00 2 spherical 3.361 0.935 3 spherical 15.008 1.105 1.59 61.30 4 spherical 3.851 0.900 5 spherical 6.840 4.003 2.00 25.40 6 spherical 5.654 0.300 7 spherical 5.174 4.013 1.77 49.60 8 spherical -6.620 -0.332 STO flat PL 0.402 10 spherical 14.907 1.788 1.59 68.30 11 spherical -2.969 1.041 1.95 32.30 12 spherical -6.209 1.200 13 flat PL 0.700 1.52 64.20 14 flat PL 5.366

[0069] The surface number is assigned according to the order of the surfaces of each lens. For example, surface number "1" represents the object side of the first lens 301, surface number "2" represents the image side of the first lens 301, and so on. "STO" represents the aperture stop of the lens. The radius of curvature represents the curvature of the lens surface. A positive value means that the surface bends towards the object surface with the center closer to the image surface, and a negative value means that the surface bends towards the image surface with the center closer to the object surface. "PL" means that the surface is flat and the radius of curvature is infinite. The thickness represents the axial distance between the center of the current surface and the next surface. The material (Nd) represents the refractive index, which is the ability of the material between the current surface and the next surface to deflect light. A space indicates that the current position is air and the refractive index is 1. The material (Vd) represents the Abbe number, which is the dispersion characteristic of the material between the current surface and the next surface. A space indicates that the current position is air.

[0070] Figure 8This invention provides a lateral ray fan diagram for a vehicle-mounted lens in Embodiment 3 of the present invention. The horizontal axis of the ray fan diagram represents the normalized pupil aperture, and the vertical axis represents the distance of the corresponding ray from the principal ray on the image plane. It should be noted that the principal ray is the ray that passes through the center of the entrance pupil. Ideally, each curve completely coincides with the horizontal axis, at which point all rays in the field of view converge at the same point on the image plane. Figure 8 As shown, the curves of the light fan plots for different wavelengths in all fields of view are close to the horizontal axis, and the curves of each color have a high degree of concentration. This indicates that the aberrations of each field of view of the vehicle-mounted lens are well corrected, which can ensure that the vehicle-mounted lens can achieve clear imaging in a wide spectral range.

[0071] Figure 9 This invention provides a field curvature distortion curve diagram for a vehicle-mounted lens in Embodiment 3 of the present invention, as shown in the figure. Figure 9 As shown, in the coordinate system on the left side of the figure, the horizontal coordinate represents the magnitude of the field curvature, in mm; the vertical coordinate represents the normalized image height, which has no unit; where T represents the meridion and S represents the arc loss; from Figure 9 It can be seen that the lens provided in this embodiment effectively controls the field curvature from light with wavelengths from 436nm to 656nm, meaning that during imaging, the difference in image quality between the center and the periphery is small; in the coordinate system on the right, the horizontal axis represents the magnitude of distortion, expressed as a percentage; the vertical axis represents the normalized image height, which has no unit; from Figure 9 As can be seen, the imaging distortion of the lens provided in this embodiment is less than 50%, indicating that the lens distortion has been well corrected and the vehicle-mounted lens has a good imaging effect.

[0072] To provide a clearer explanation of the above embodiments, Table 4 details the specific optical physical parameters of each lens in the vehicle-mounted lens provided in embodiments one to three of this utility model, as well as other feasible optical physical parameters.

[0073] Table 4 Design values ​​of optical physical parameters for vehicle-mounted lenses

[0074]

[0075]

[0076] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A vehicle-mounted lens, characterized in that, It includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object plane to the image plane; The first lens has negative optical power, the second lens has negative optical power, the third lens has positive optical power, and the fourth lens has positive optical power; the fifth lens and the sixth lens are cemented together to form a cemented lens group, which has either positive or negative optical power.

2. The vehicle-mounted lens according to claim 1, characterized in that, The surface of the lens adjacent to the object plane is called the object-side surface, and the surface of the lens adjacent to the image plane is called the image-side surface; the image-side surface of the first lens convexes towards the object plane; the object-side surface of the second lens convexes towards the object plane, and the image-side surface of the second lens convexes towards the object plane; the object-side surface of the third lens convexes towards the object plane; the image-side surface of the fourth lens is recessed towards the object plane; the object-side surface of the fifth lens convexes towards the object plane, and the image-side surface of the fifth lens is recessed towards the object plane; the object-side surface of the sixth lens is recessed towards the object plane, and the image-side surface of the sixth lens is recessed towards the object plane.

3. The vehicle-mounted lens according to claim 1, characterized in that, The first lens is a meniscus lens.

4. The vehicle-mounted lens according to claim 1, characterized in that, The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all glass spherical lenses.

5. The vehicle-mounted lens according to claim 1, characterized in that, The first lens has a refractive index of Nd1, the second lens has a refractive index of Nd2, the third lens has a refractive index of Nd3, the fourth lens has a refractive index of Nd4, the fifth lens has a refractive index of Nd5, and the sixth lens has a refractive index of Nd6, wherein 1.47≤Nd1≤2.01; 1.39≤Nd2≤1.69; and 1.82≤Nd3≤2.

05. 1.67≤Nd4≤1.92; 1.49≤Nd5≤1.72; 1.85≤Nd6≤2.

00.

6. The vehicle-mounted lens according to claim 1, characterized in that, The Abbe number of the first lens is Vd1, the Abbe number of the second lens is Vd2, the Abbe number of the third lens is Vd3, the Abbe number of the fourth lens is Vd4, the Abbe number of the fifth lens is Vd5, and the Abbe number of the sixth lens is Vd6, wherein 34.30≤Vd1≤64.00; 60.30≤Vd2≤72.40; 16.20≤Vd3≤26.40; 45.60≤Vd4≤50.60; 62.40≤Vd5≤69.30; and 16.90≤Vd6≤33.

30.

7. The vehicle-mounted lens according to claim 1, characterized in that, The distance from the center of the optical axis on the image side of the sixth lens to the image plane is BFL, and the distance from the center of the optical axis on the object side of the first lens to the image plane is TTL, wherein BFL / TTL≥0.

284.

8. The vehicle-mounted lens according to claim 1, characterized in that, The field of view of the vehicle-mounted lens is FOV, and the distance from the center of the optical axis on the object side of the first lens to the image plane is TTL, wherein FOV / TTL≥4.

75.

9. The vehicle-mounted lens according to claim 1, characterized in that, The vehicle-mounted camera also includes an aperture stop; The aperture is located in the optical path between the third lens and the fourth lens.

10. The vehicle-mounted lens according to claim 1, characterized in that, The vehicle-mounted camera also includes a filter; The filter is located on the image-side side of the sixth lens.

Images