Vehicle-mounted lens

Abstract

The invention 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] The present invention relates to the technical field of optical lenses, and particularly to a vehicle-mounted lens. Background Art

[0002] Automobile intelligence is one of the important directions for the future development of the industry. As the eyes of automobile intelligence, vehicle-mounted lenses provide content and services for drivers during driving, improving driving safety, comfort, and convenience. As an important part of vehicle-mounted lenses, vehicle-mounted side-view lenses attach great importance to optical performance and have been progressing towards high-precision, high-adaptability, miniaturization, and intelligence. At present, under the design trend of miniaturization of vehicle-mounted cameras, the overall aberration of the lens is relatively large, which is not conducive to achieving high-quality imaging. Summary of the Invention

[0003] The present invention provides a vehicle-mounted lens, which can meet the imaging requirements of low aberration and high image quality on the premise of a small volume.

[0004] The present invention provides a vehicle-mounted lens, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence along the optical axis from the object plane to the image plane;

[0005] The first lens has a negative optical power, the second lens has a negative optical power, the third lens has a positive optical power, and the fourth lens has a positive optical power; the fifth lens and the sixth lens are glued and fixed to form a glued lens group, and the glued lens group has a positive optical power or a 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 protrudes towards the object plane; the object side surface of the second lens protrudes towards the object plane, and the image side surface of the second lens protrudes towards the object plane; the object side surface of the third lens protrudes 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 protrudes 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, where 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; 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, where 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; 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, where BFL / TTL ≥ 0.284.

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

[0013] Optionally, the vehicle-mounted lens further includes a diaphragm;

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

[0015] Optionally, the vehicle-mounted lens further includes a filter;

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

[0017] The technical solution of the embodiment of the present invention provides a vehicle-mounted lens, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence along the optical axis from the object plane to the image plane; the first lens has a negative optical power, the second lens has a negative optical power, the third lens has a positive optical power, and the fourth lens has a positive optical power; the fifth lens and the sixth lens are glued and fixed to form a glued lens group, and the glued lens group has a positive optical power or a negative optical power. By reasonably designing the relative positions and optical powers of each lens, it is ensured that the vehicle-mounted lens meets the imaging requirements of high image quality and low aberration in the case of a small volume.

[0018] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of a vehicle-mounted lens provided by an embodiment of the present invention;

[0021] Figure 2 It is a lateral fan diagram of a vehicle-mounted lens provided by Embodiment 1 of the present invention;

[0022] Figure 3 It is a field curvature and distortion curve diagram of a vehicle-mounted lens provided by Embodiment 1 of the present invention;

[0023] Figure 4 It is a schematic structural diagram of a vehicle-mounted lens provided by Embodiment 2 of the present invention;

[0024] Figure 5 It is a lateral fan diagram of a vehicle-mounted lens provided by Embodiment 2 of the present invention;

[0025] Figure 6 It is a field curvature and distortion curve diagram of a vehicle-mounted lens provided by Embodiment 2 of the present invention;

[0026] Figure 7 It is a schematic structural diagram of a vehicle-mounted lens provided by Embodiment 3 of the present invention;

[0027] Figure 8 It is a lateral fan diagram of a vehicle-mounted lens provided by Embodiment 3 of the present invention;

[0028] Figure 9 Embodiment 3 of the present invention provides a field curvature distortion curve graph of a vehicle-mounted lens. Detailed implementation manners

[0029] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0031] Figure 1 Embodiment of the present invention provides a structural schematic diagram of a vehicle-mounted lens, as Figure 1 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 in sequence from the object plane to the image plane along the optical axis; the first lens 101 has a negative optical power, the second lens 102 has a negative optical power, the third lens 103 has a positive optical power, and the fourth lens 104 has a positive optical power; the fifth lens 105 and the sixth lens 106 are glued and fixed to form a glued lens group, and the glued lens group has a positive optical power or a negative optical power.

[0032] Exemplarily, the optical power is equal to the difference between the convergence of the image-space beam and the convergence of the object-space beam, which characterizes the ability of the optical system to deflect light rays. The greater the absolute value of the optical power, the stronger the bending ability of the light rays; the smaller the absolute value of the optical power, the weaker the bending ability of the light rays. When the optical power is positive, the refraction of the light rays is convergent; when the optical power is negative, the refraction of the light rays is divergent. The optical power can be used to characterize a certain refracting surface of a lens (i.e., one surface of the lens), can be used to characterize a certain lens, or can be used to characterize a system formed by multiple lenses together (i.e., a lens group). The first lens 101 and the second lens 102 are negative optical power lenses, which are used to control the incident angle of the light rays in the optical system, help to alleviate the large incident angle of the light rays, and ensure a large field of view angle; the settings of the optical powers of the third lens 103 and the fourth lens 104 can well correct chromatic aberration, which is beneficial to improving the optical performance of the system. By setting the fifth lens and the sixth lens 106 to be glued and fixed to form a glued lens group, the glued lens group has a positive optical power or a negative optical power, which can effectively reduce the air gap between the fifth lens and the sixth lens 106, thereby further reducing the total length of the lens. In addition, the glued lens group can minimize or eliminate chromatic aberration to the greatest extent, so that various aberrations of the vehicle-mounted lens can be fully corrected. On the premise of a compact structure, the resolution can be improved, the optical performance such as distortion can be optimized, and the light loss caused by reflection between lenses can be reduced, the illuminance can be increased, thereby improving the image quality and enhancing the clarity of the lens imaging. In addition, the use of the glued lens group can also reduce the assembly components between the lenses, simplify the assembly procedure in the lens manufacturing process, reduce costs, and reduce the sensitivity of the lens unit to tolerances such as tilt / eccentricity generated during the assembly process.

[0033] Optionally, the surface of the lens adjacent to the object plane side is the object side surface, and the surface of the lens adjacent to the image plane side is the image side surface; the image side surface of the first lens 101 protrudes towards the object plane; the object side surface of the second lens 102 protrudes towards the object plane, and the image side surface of the second lens 102 protrudes towards the object plane; the object side surface of the third lens 103 protrudes 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 protrudes 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. As Figure 1As shown, the object side of the first lens 101 bulges towards the object plane, and the image side of the first lens 101 bulges towards the object plane; the object side of the third lens 103 bulges towards the object plane, and the image side of the third lens 103 bulges towards the object plane; the object side of the fourth lens 104 is a plane, and the image side of the fourth lens 104 is concave towards the object plane. The first lens 101 and the second lens 102 are both meniscus lenses, which can better allow light to enter the optics, enabling the light to propagate smoothly without excessive deflection, so as to avoid introducing greater aberrations. By reasonably setting the surface shapes of some lenses, while ensuring that the optical powers of each lens meet the optical power requirements in the above embodiments, the overall structure of the vehicle-mounted lens can be made compact and the integration degree of the vehicle-mounted lens can be high.

[0034] Optionally, the first lens 101 is a meniscus lens. As Figure 1 shown, the object side of the first lens 101 bulges towards the object plane, which can better allow light to enter the optics, enabling the light to propagate smoothly without excessive deflection, so as to avoid introducing greater aberrations. At the same time, it is beneficial to reduce the aperture and total length of the lens. In addition, the first lens 101 can also be a biconcave lens. As Figure 7 shown, by reasonably setting the surface shape of the first lens 101, the adjustment of the incident light can be realized, the aberration 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, the characteristic of a spherical lens is that it has a constant curvature from the center of the lens to the periphery of the lens, ensuring a simple setting method for the lens. Further, since the glass material lens has a small coefficient of thermal expansion and good stability, 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 can all be set as glass spherical lenses. The thermal properties of the glass spherical lens are more stable, and when bearing more optical power, it can ensure good resolution ability of the lens within a wide temperature range. In addition, compared with plastic aspherical lenses, the range of glass materials that can be selected is wider, and the selection of refractive index and Abbe number is relatively free. To a certain extent, it can control the high-order aberrations and chromatic aberrations of the lens and meet the usage requirements 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, where 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; 1.85 ≤ Nd6 ≤ 2.00.

[0038] Among them, the refractive index is the ratio of the propagation speed of light in a vacuum to the propagation speed of light in the medium, which is mainly used to describe the refractive ability of the material to light. The refractive indices of different materials are different. Through the mutual combination of different lenses and the reasonable distribution of their refractive indices, the vehicle-mounted lens has performances such as low cost, high pixels, and clear imaging even in low-light environments. By limiting 1.47 ≤ Nd1 ≤ 2.01, the light in a relatively wide viewing angle range can be effectively converged, and the aperture of the first lens 101 can be reduced, which is beneficial to 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, where 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; 16.90 ≤ Vd6 ≤ 33.30.

[0040] Among them, the Abbe number is an index used to represent the dispersion ability of a transparent medium. The more serious the medium dispersion is, the smaller the Abbe number is; conversely, the lighter the medium dispersion is, the larger the Abbe number is. Thus, by setting the refractive indices and Abbe numbers of the lenses in the vehicle-mounted vision lens, the system aberration can be corrected, and it is also beneficial to realize the miniaturized design of the vehicle-mounted.

[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, where BFL / TTL ≥ 0.284.

[0042] Exemplarily, the distance from the optical axis center of 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 of the vehicle-mounted lens and the total length of the vehicle-mounted lens, the entire vehicle-mounted lens structure can be ensured to be compact and the integration degree of the vehicle-mounted lens is high. When the vehicle-mounted lens meets this condition, it can ensure that there is enough installation space for the imaging sensor and the flat filter 10.

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

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

[0045] Among them, by adding the diaphragm STO, the propagation direction of the light beam can be adjusted, which is beneficial to improving the imaging quality. The diaphragm STO can be located in the optical path between the third lens 103 and the fourth lens 104, but the specific setting position of the diaphragm STO in the embodiments of the present invention is not limited.

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

[0047] By arranging the filter 10 on the image side of the sixth lens 106, unnecessary stray light can be filtered out, thereby improving the image quality of the vehicle-mounted lens. For example, the imaging quality of the vehicle-mounted lens can be improved by filtering out infrared light through the filter 10 during the day.

[0048] Optionally, a chip protection glass 11 is further arranged along the object plane to the image plane; the chip protection glass 11 is located on the image side of the filter 10. By arranging the chip protection glass 11 on the image side of the filter 10 to protect the photosensitive chip in the imaging sensor, where the imaging chip is used to convert the optical signal collected by the vehicle-mounted lens into an electrical signal, thereby ensuring the imaging effect of the vehicle-mounted lens.

[0049] Therefore, the embodiments of the present invention adopt six lenses. By reasonably distributing the lens surface type, optical power, and the relative positions between the lenses, and using a combination of all-glass spherical surfaces, spherical aberration can be well corrected, ensuring good enough image quality and stable resolution at high and low temperatures. It can meet a large field of view angle, the total length of the lens is less than 21.7 mm, the image plane diameter can reach 6.6 mm, and the FOV can reach 120°, having good commercial value.

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

[0051] Embodiment 1

[0052] Continue to refer to Figure 1, 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 in sequence along the optical axis from the object plane to the image plane; the first lens 101 has a negative optical power, the second lens 102 has a negative optical power, the third lens 103 has a positive optical power, and the fourth lens 104 has a positive optical power; the fifth lens 105 and the sixth lens 106 are adhesively fixed to form an adhesive lens group, and the adhesive lens group has a positive optical power or a negative optical power. The object side surface of the first lens 101 bulges toward the object plane, and the image side surface of the first lens 101 bulges toward the object plane; the object side surface of the second lens 102 bulges toward the object plane, and the image side surface of the second lens 102 bulges toward the object plane; the object side surface of the third lens 103 bulges toward the object plane, and the image side surface of the third lens 103 bulges toward the object plane; the object side surface of the fourth lens 104 is a plane, and the image side surface of the fourth lens 104 depresses toward the object plane; the object side surface of the fifth lens 105 bulges toward the object plane, and the image side surface of the fifth lens 105 depresses toward the object plane; the object side surface of the sixth lens 106 depresses toward the object plane, and the image side surface of the sixth lens 106 depresses toward 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 and physical parameters of each lens in the vehicle-mounted lens provided in the first embodiment of the present invention in a feasible implementation manner.

[0053] Table 1 Design values of the optical and physical parameters of the vehicle-mounted lens

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

[0055] Among them, the surface numbers are numbered according to the surface order of each lens. For example, the surface number "1" represents the object side surface of the first lens 101, the surface number "2" represents the image side surface of the first lens 101, and so on; "STO" represents the aperture stop of the lens; the radius of curvature represents the degree of curvature of the lens surface. A positive value represents that the surface bends toward the object plane side and the center is close to the image plane, and a negative value represents that the surface bends toward the image plane side and the center is close to the object plane. Among them, "PL" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface; the material (Nd) represents the refractive index, that is, the ability of the material between the current surface and the next surface to deflect light, and a space represents that the current position is air and the refractive index is 1; the material (Vd) represents the Abbe number, that is, the dispersion characteristic of the material between the current surface and the next surface to light, and a space represents that the current position is air.

[0056] Figure 2The horizontal light fan diagram of a vehicle-mounted lens provided in Embodiment 1 of the present invention. The horizontal axis of the light fan diagram represents the normalized pupil aperture, and the vertical axis represents the distance of the corresponding light ray from the chief ray on the image plane. It should be noted that the chief ray is the light ray passing through the center of the entrance pupil. In the ideal state, each curve coincides completely with the horizontal coordinate axis. At this time, all light rays in this field of view converge at the same point on the image plane. As Figure 2 shown, the curves of the light fan diagrams of all fields of view and different wavelengths are all well approximated to the abscissa, and the concentration of the curves of each color is relatively high, indicating that the aberrations of each field of view of the vehicle-mounted lens are well corrected, and it can ensure clear imaging of the vehicle-mounted lens in a relatively wide spectral range.

[0057] Figure 3 The field curvature and distortion curve diagram of a vehicle-mounted lens provided in Embodiment 1 of the present invention. As Figure 3 shown, in the left coordinate system in the figure, the horizontal coordinate represents the magnitude of field curvature, with the unit of mm; the vertical coordinate represents the normalized image height, without unit; where T represents meridian and S represents sagittal. From Figure 3 it can be seen that the field curvature of the lens provided in this embodiment is effectively controlled from the light with a wavelength of 436 nm to the light with a wavelength of 656 nm. That is, during imaging, the image quality difference between the center and the periphery is relatively small. In the right coordinate system, the horizontal coordinate represents the magnitude of distortion, with the unit of %; the vertical coordinate represents the normalized image height, without unit. From Figure 3 it can be seen that the imaging distortion of the lens provided in this embodiment is less than 50%, indicating that the distortion of the lens is well corrected, and the vehicle-mounted lens has good imaging effect.

[0058] Embodiment 2

[0059] Figure 4 The structural schematic diagram of a vehicle-mounted lens provided in Embodiment 2 of the present invention. As 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 in sequence along the optical axis from the object plane to the image plane; the first lens 201 has a negative optical power, the second lens 202 has a negative optical power, the third lens 203 has a positive optical power, and the fourth lens 204 has a positive optical power; the fifth lens 105 and the sixth lens 206 are glued and fixed to form a glued lens group, and the glued lens group has a positive optical power or a negative optical power. The object side surface of the first lens 201 protrudes toward the object plane, and the image side surface of the first lens 201 protrudes toward the object plane; the object side surface of the second lens 202 protrudes toward the object plane, and the image side surface of the second lens 202 protrudes toward the object plane; the object side surface of the third lens 203 protrudes toward the object plane, and the image side surface of the third lens 203 is a plane; the object side surface of the fourth lens 204 is recessed toward the object plane, and the image side surface of the fourth lens 204 is recessed toward the object plane; the object side surface of the fifth lens 205 protrudes toward the object plane, and the image side surface of the fifth lens 205 is recessed toward the object plane; the object side surface of the sixth lens 206 is recessed toward the object plane, and the image side surface of the sixth lens 206 is recessed toward 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 and physical parameters of each lens in the vehicle-mounted lens provided in the second embodiment of the present invention in a feasible implementation manner.

[0060] Table 2 Design Values of Optical and Physical Parameters of Vehicle-Mounted Lens

[0061] Surface Serial Number Surface Type Radius of Curvature Thickness Material (Nd) Material (Vd) 1 Spherical Surface 83.816 1.201 1.91 35.30 2 Spherical Surface 3.554 1.011 3 Spherical Surface 6.175 2.002 1.52 64.20 4 Spherical Surface 3.894 1.351 5 Spherical Surface 7.715 4.014 1.95 17.90 6 Spherical Surface PL 0.150 STO Plane PL 0.200 8 Spherical Surface -24.659 2.222 1.80 46.60 9 Spherical Surface -5.646 0.070 10 Spherical Surface 10.836 1.407 1.62 63.40 11 Spherical Surface -3.905 2.801 1.95 17.90 12 Spherical Surface -11.154 1.200 13 Plane PL 0.700 1.52 64.40 14 Plane PL 5.024

[0062] Among them, the surface numbers are numbered according to the surface order of each lens. For example, the surface number "1" represents the object side surface of the first lens 201, the surface number "2" represents the image side surface of the first lens 201, and so on; "STO" represents the aperture stop STO of the lens; the radius of curvature represents the degree of curvature of the lens surface. A positive value represents that the surface bends toward the object plane side and the center is close to the image plane, and a negative value represents that the surface bends toward the image plane side and the center is close to the object plane. Among them, "PL" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface; the material (Nd) represents the refractive index, that is, the ability of the material between the current surface and the next surface to deflect light. A space represents that the current position is air and the refractive index is 1; the material (Vd) represents the Abbe number, that is, the dispersion characteristic of the material between the current surface and the next surface to light. A space represents that the current position is air.

[0063] Figure 5The horizontal light fan diagram of a vehicle-mounted lens provided in the second embodiment of the present invention. The horizontal axis of the light fan diagram represents the normalized pupil aperture, and the vertical axis represents the distance of the corresponding light ray from the chief ray on the image plane. It should be noted that the chief ray is the light ray passing through the center of the entrance pupil; in the ideal state, each curve coincides completely with the horizontal coordinate axis. At this time, all light rays in this field of view converge at the same point on the image plane; as Figure 5 shown, the curves of the light fan diagrams of all fields of view and different wavelengths are all well approximated to the abscissa, and the concentration of the curves of each color is relatively high, indicating that the aberrations of each field of view of the vehicle-mounted lens are well corrected, and it can ensure clear imaging of the vehicle-mounted lens in a relatively wide spectral range.

[0064] Figure 6 The field curvature and distortion curve diagram of a vehicle-mounted lens provided in the second embodiment of the present invention. As Figure 6 shown, in the left coordinate system in the figure, the horizontal coordinate represents the magnitude of the field curvature, with the unit of mm; the vertical coordinate represents the normalized image height, without a unit; where T represents meridional and S represents sagittal; from Figure 6 it can be seen that for the lens provided in this embodiment, from the light with a wavelength of 436nm to the light with a wavelength of 656nm, the field curvature is effectively controlled, that is, during imaging, the image quality at the center and the image quality at the periphery have a small difference; in the right coordinate system, the horizontal coordinate represents the magnitude of the distortion, with the unit of %; the vertical coordinate represents the normalized image height, without a unit; from Figure 6 it can be seen that the imaging distortion of the lens provided in this embodiment is less than 50%, indicating that the distortion of the lens is well corrected, and the vehicle-mounted lens has a good imaging effect.

[0065] Embodiment 3

[0066] Figure 7 The structural schematic diagram of a vehicle-mounted lens provided in the third embodiment of the present invention. As Figure 7As shown in the figure, 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 in sequence along the optical axis from the object plane to the image plane; the first lens 301 has a negative optical power, the second lens 302 has a negative optical power, the third lens 303 has a positive optical power, and the fourth lens 304 has a positive optical power; the fifth lens 305 and the sixth lens 306 are glued and fixed to form a glued lens group, and the glued lens group has a positive optical power or a negative optical power. The object side of the first lens 301 is recessed toward the object plane, and the image side of the first lens 301 is convex toward the object plane; the object side of the second lens 302 is convex toward the object plane, and the image side of the second lens 302 is convex toward the object plane; the object side of the third lens 303 is convex toward the object plane, and the image side of the third lens 303 is convex toward the object plane; the object side of the fourth lens 304 is convex toward the object plane, and the image side of the fourth lens 304 is recessed toward the object plane; the object side of the fifth lens 305 is convex toward the object plane, and the image side of the fifth lens 305 is recessed toward the object plane; the object side of the sixth lens 306 is recessed toward the object plane, and the image side of the sixth lens 306 is recessed toward 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 the third embodiment of the present invention in a feasible implementation manner.

[0067] Table 3 Design values of the optical physical parameters of the vehicle-mounted lens

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

[0069] Among them, the surface numbers are numbered according to the surface order of each lens. For example, the surface number "1" represents the object side of the first lens 301, the 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 degree of curvature of the lens surface. A positive value represents that the surface bends toward the object plane side and the center is close to the image plane, and a negative value represents that the surface bends toward the image plane side and the center is close to the object plane. Among them, "PL" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface; the material (Nd) represents the refractive index, that is, the ability of the material between the current surface and the next surface to deflect light. A space represents that the current position is air and the refractive index is 1; the material (Vd) represents the Abbe number, that is, the dispersion characteristic of the material between the current surface and the next surface to light. A space represents that the current position is air.

[0070] Figure 8The horizontal light fan diagram of a vehicle-mounted lens provided in Embodiment 3 of the present invention. The horizontal axis of the light fan diagram represents the normalized pupil aperture, and the vertical axis represents the distance of the corresponding light ray from the chief ray on the image plane. It should be noted that the chief ray is the light ray passing through the center of the entrance pupil; in the ideal state, each curve coincides completely with the horizontal coordinate axis, and at this time, all light rays in this field of view converge at the same point on the image plane; as Figure 8 shown, the curves of the light fan diagrams of all fields of view and different wavelengths are all well approximated to the abscissa, and the concentration of the curves of each color is relatively high, indicating that the aberrations of each field of view of the vehicle-mounted lens are well corrected, and it can ensure clear imaging of the vehicle-mounted lens in a relatively wide spectral range.

[0071] Figure 9 The field curvature and distortion curve diagram of a vehicle-mounted lens provided in Embodiment 3 of the present invention. As Figure 9 shown, in the left coordinate system in the figure, the horizontal coordinate represents the magnitude of the field curvature, with the unit of mm; the vertical coordinate represents the normalized image height, without a unit; where T represents meridian and S represents sagittal; from Figure 9 it can be seen that for the lens provided in this embodiment, from the light with a wavelength of 436 nm to the light with a wavelength of 656 nm, the field curvature is effectively controlled, that is, when imaging, the image quality difference between the center and the periphery is small; in the right coordinate system, the horizontal coordinate represents the magnitude of the distortion, with the unit of %; the vertical coordinate represents the normalized image height, without a unit; from Figure 9 it can be seen that the imaging distortion of the lens provided in this embodiment is less than 50%, indicating that the distortion of the lens is well corrected, and the vehicle-mounted lens has a good imaging effect.

[0072] To more clearly illustrate the above embodiments, Table 4 details the specific optical physical parameters of each lens in the vehicle-mounted lens provided in Embodiments 1 to 3 of the present invention and other feasible optical physical parameters.

[0073] Table 4 Design values of the optical physical parameters of the vehicle-mounted lens

[0074]

[0075]

[0076] The above specific implementation manners do not constitute a limitation to the protection scope of the present invention. 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 principle of the present invention shall be included within the protection scope of the present invention.

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 in sequence along the optical axis from the object plane to the image plane; The first lens has a negative focal power, the second lens has a negative focal power, the third lens has a positive focal power, and the fourth lens has a positive focal power; the fifth lens and the sixth lens are glued and fixed to form a glued lens group, and the glued lens group has a positive focal power or a negative focal power.

2. The vehicle-mounted lens according to claim 1, wherein The surface of the lens on the side adjacent to the object plane is the object side surface, and the surface of the lens on the side adjacent to the image plane is the image side surface; the image side surface of the first lens bulges toward the object plane; the object side surface of the second lens bulges toward the object plane, and the image side surface of the second lens bulges toward the object plane; the object side surface of the third lens bulges toward the object plane; the image side surface of the fourth lens is concave toward the object plane; the object side surface of the fifth lens bulges toward the object plane, and the image side surface of the fifth lens is concave toward the object plane; the object side surface of the sixth lens is concave toward the object plane, and the image side surface of the sixth lens is concave toward the object plane.

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

4. The vehicle-mounted lens according to claim 1, wherein 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, wherein 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, where 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; 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, where 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; 16.90 ≤ Vd6 ≤ 33.

30.

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

284.

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

75.

9. The vehicle-mounted lens according to claim 1, wherein, The vehicle-mounted lens further includes a diaphragm; The diaphragm 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 lens further includes a filter; The filter is located on the side of the image side surface of the sixth lens.

Images