Vehicle-mounted ADAS lens and vehicle

Abstract

The invention provides a vehicle-mounted ADAS lens and a vehicle, and is based on the technical field of vehicle-mounted lenses, the vehicle-mounted ADAS lens is provided with an object side and an image side which are oppositely arranged along the direction of an optical axis, and the vehicle-mounted ADAS lens comprises a first lens group with positive focal power, a second lens group with positive focal power, a third lens group with positive focal power, a fourth lens group with positive focal power, a fifth lens group with positive focal power and a sixth lens group with negative focal power, which are sequentially arranged from the object side to the image side, all lenses in the first lens group and the second lens group are glass spherical lenses, the focal length of the first lens group is f11, the focal length of the second lens group is f22, the focal length of the vehicle-mounted ADAS lens is f, f11 / f is larger than 1.5 and smaller than 2.5, f22 / f is larger than 3 and smaller than 6.5, so that the field angle of the vehicle-mounted ADAS lens reaches 130 degrees or above, the F value of the number of apertures reaches 1.8, and the F value of the number of apertures reaches 1.8. And the resolution reaches three million pixels. According to the technical scheme provided by the invention, the focal power of each lens group and the material of the lens are reasonably set, so that the vehicle-mounted ADAS lens which is large in viewing angle, large in aperture, high in image quality and capable of clearly imaging in a weak light environment is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted lenses, and in particular to a vehicle-mounted ADAS lens and a vehicle. Background Art

[0002] With the technological innovation and vigorous promotion of smart driving cars, consumers and automakers have an increasing demand for driving safety. As an important part of smart driving, the Advanced Driving Assistance System (ADAS) equipped with a dedicated high-definition camera can effectively reduce the occurrence of dangers during driving and provide safety protection for drivers. At present, most on-board ADAS lenses have a small field of view corresponding to the image plane, insufficient resolution, large chromatic aberration, large distortion, and more stray light, and the image quality is low at night, and there is still a lot of room for improvement in performance. Summary of the invention

[0003] The main purpose of the present invention is to provide a vehicle-mounted ADAS lens and a car, aiming to provide a vehicle-mounted ADAS lens with a large viewing angle, a large aperture, high image quality and clear imaging even in a low-light environment.

[0004] To achieve the above-mentioned object, the present invention proposes a vehicle-mounted ADAS lens, which has an object side and an image side arranged opposite to each other along the optical axis direction, and includes a first lens group with positive optical focal length and a second lens group with positive optical focal length, which are arranged in sequence from the object side to the image side, and all lenses in the first lens group and the second lens group are configured as glass spherical lenses, the focal length of the first lens group is f11, the focal length of the second lens group is f22, and the focal length of the vehicle-mounted ADAS lens is f, wherein: 1.5<f11 / f<2.5, 3<f22 / f<6.5, so that the field of view angle of the vehicle-mounted ADAS lens reaches more than 130°, the aperture number F value reaches 1.8, and the resolution reaches 3 million pixels.

[0005] In one embodiment, the vehicle-mounted ADAS lens further includes an aperture stop, and the aperture stop is disposed between the first lens group and the second lens group.

[0006] In one embodiment, the vehicle-mounted ADAS lens further includes a filter and a protective glass, wherein the filter is disposed on one side of the second lens group facing the image side to filter out stray light in non-working bands, and the protective glass is disposed on one side of the filter facing the image side.

[0007] In one embodiment, the first lens group includes a first lens with negative optical power, a second lens group with negative optical power, a third lens with positive optical power, and a fourth lens with positive optical power, which are arranged in sequence from the object side to the image side;

[0008] The second lens group includes a fifth lens with positive optical power, a sixth lens group with negative optical power, and a seventh lens with positive optical power, which are arranged in sequence from the object side to the image side.

[0009] In one implementation, the fifth lens and the sixth lens are glued together, the focal length of the lens glued together by the fifth lens and the sixth lens is f56, and the focal length of the vehicle-mounted ADAS lens is f, wherein:

[0010] 5<f56 / f<10.

[0011] In one embodiment, the first lens is a meniscus lens, and its object-side surface is a convex surface;

[0012] The second lens is a meniscus lens, and its object side surface is concave;

[0013] The third lens is a biconvex lens;

[0014] The fourth lens is a meniscus lens, and its object side surface is concave;

[0015] The fifth lens is a biconvex lens;

[0016] The sixth lens is a meniscus lens, and its object side surface is concave;

[0017] The seventh lens is a biconvex lens.

[0018] In one implementation, 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 lens cemented by the fifth lens and the sixth lens is f56, the focal length of the seventh lens is f7, and the focal length of the vehicle-mounted ADAS lens is f, wherein:

[0019] -2<f1 / f<-1, -25<f2 / f<-10, 1<f3 / f<3, 4<f4 / f<9, 6<f56 / f<11, 4<f7 / f<10.

[0020] In one embodiment, the refractive index of the first lens is n1, the refractive index of the second lens is n2, the refractive index of the third lens is n3, the focal refractive index of the fourth lens is n4, the refractive index of the fifth lens is n5, the refractive index of the sixth lens is n6, and the refractive index of the seventh lens is n7, wherein:

[0021] 1.80≤n1, 1.75≤n2≤2.10, 1.75≤n3≤2.10, 1.60≤n4≤1.70, 1.55≤n5≤1.60, 1.90≤n6≤2.00, 1.60≤n7≤1.70.

[0022] In one embodiment, D1 is the aperture of the first lens, r2 is the radius of curvature of the image side surface of the first lens, r4 is the radius of curvature of the object side surface of the second lens, r5 is the radius of curvature of the image side surface of the second lens, r6 is the radius of curvature of the object side surface of the third lens, r7 is the radius of curvature of the image side surface of the third lens, r8 is the radius of curvature of the object side surface of the fourth lens, r9 is the radius of curvature of the image side surface of the fourth lens, r11 is the radius of curvature of the object side surface of the fifth lens, r12 is the radius of curvature of the image side surface of the fifth lens, r13 is the radius of curvature of the image side surface of the sixth lens, r14 is the radius of curvature of the object side surface of the seventh lens, and r15 is the radius of curvature of the image side surface of the seventh lens, wherein:

[0023] 1<D1 / r2<2, 0.5≤r5 / r4≤1.5, -6≤r7 / r6≤-1, 1≤r8 / r9≤6, -2≤r12 / r11≤-0.1, 2≤r13 / r12≤5, -4≤r15 / r14≤-2.

[0024] The present invention also proposes a vehicle, comprising the above-mentioned on-vehicle ADAS lens, wherein the on-vehicle ADAS lens has an object side and an image side arranged opposite to each other along the optical axis direction, and the on-vehicle ADAS lens comprises a first lens group with positive optical focal length and a second lens group with positive optical focal length, which are arranged in sequence from the object side to the image side, and all lenses in the first lens group and the second lens group are configured as glass spherical lenses, the focal length of the first lens group is f11, the focal length of the second lens group is f22, and the focal length of the on-vehicle ADAS lens is f, wherein: 1.5<f11 / f<2.5, 3<f22 / f<6.5, so that the field of view angle of the on-vehicle ADAS lens reaches more than 130°, the aperture number F value reaches 1.8, and the resolution reaches 3 million pixels.

[0025] The technical solution provided by the present invention, by setting the second lens group with positive focal power, bears the larger focal power of the system, changes the propagation direction of the light beam, corrects the aberration of the off-axis field of view, and is more conducive to the imaging of the light beam on the image plane; by setting all lenses in the first lens group and the second lens group as glass spherical lenses, the aberration is effectively improved to maintain high resolution, and a higher imaging quality can be obtained in low illumination or night environments, and the glass material is also conducive to the temperature adaptability of the lens, so that the lens can work normally under various working conditions, and by limiting the relationship between the focal length of each lens group and the focal length of the lens, various aberrations are corrected, the edge image quality is improved, and the imaging quality is high. In terms of aperture, the aperture value f satisfies 1.8≤f≤2.0, so that the field of view of the vehicle-mounted ADAS lens reaches more than 130°, the field of view is wider, and the data information is more sufficient. The aperture number F value reaches 1.8, the lens can also clearly image in weak light, and the resolution reaches 3 million pixels, realizing a vehicle-mounted ADAS lens with a large viewing angle, large aperture, small chromatic aberration, small distortion, and clear imaging in weak light environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 A schematic structural diagram of an embodiment of a vehicle-mounted ADAS lens provided by the present invention;

[0028] Figure 2 for Figure 1 Schematic diagram of the MTF curve of the vehicle-mounted ADAS lens in the visible light band;

[0029] Figure 3 for Figure 1 Schematic diagram of the defocus of the ADAS lens in the vehicle at 25°C;

[0030] Figure 4 for Figure 1 Schematic diagram of the lateral chromatic aberration curve of the vehicle-mounted ADAS lens in the visible light band;

[0031] Figure 5 for Figure 1 Schematic diagram of field curvature distortion of the ADAS lens in the vehicle;

[0032] Figure 6 A schematic structural diagram of another embodiment of the vehicle-mounted ADAS lens provided by the present invention;

[0033] Figure 7 for Figure 6 Schematic diagram of the MTF curve of the vehicle-mounted ADAS lens in the visible light band;

[0034] Figure 8 for Figure 6 Schematic diagram of the defocus of the ADAS lens in the vehicle at 25°C;

[0035] Fig. 9 for Figure 6 Schematic diagram of the lateral chromatic aberration curve of the ADAS lens in the visible light band;

[0036] Fig.10 for Figure 6 Schematic diagram of field curvature distortion of the vehicle-mounted ADAS lens.

[0037] Description of Figure Numbers:

[0038] 1000. Vehicle-mounted ADAS lens; 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens; 7. Seventh lens; 8. Aperture; 9. Filter; 10. Protective glass; 11. First lens group; 22. Second lens group; a. Vignetting stop.

[0039] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] 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 position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] With the technological innovation and vigorous promotion of smart driving cars, consumers and automakers have an increasing demand for driving safety. As an important part of smart driving, the Advanced Driving Assistance System (ADAS) equipped with a dedicated high-definition camera can effectively reduce the occurrence of dangers during driving and provide safety protection for drivers.

[0044] However, in the current industry, most automotive ADAS lenses have an aperture of more than 2.0, a small image plane corresponding to the field of view, a resolution of about two million pixels, large chromatic aberration, large distortion, and a lot of stray light. In addition, when used in low-light conditions such as at night, the image clarity is insufficient and the image quality is low. At the same time, most lens architectures use glass aspherical surfaces, resulting in high costs, heavy volume, and complex structures. These problems indicate that ADAS automotive lenses still need to be improved in both technology and performance.

[0045] The main purpose of the present invention is to provide a vehicle-mounted ADAS lens and a car, aiming to provide a vehicle-mounted ADAS lens with a large viewing angle, a large aperture, high image quality and clear imaging even in a low-light environment.

[0046] See also Figure 1 and Figure 6The present invention provides a vehicle-mounted ADAS lens 1000, which has an object side and an image side arranged opposite to each other along the optical axis direction. The vehicle-mounted ADAS lens 1000 includes a first lens group 11 with positive optical focal length and a second lens group 22 with positive optical focal length, which are arranged in sequence from the object side to the image side. All lenses in the first lens group 11 and the second lens group 22 are configured as glass spherical lenses. The focal length of the first lens group 11 is f11, the focal length of the second lens group 22 is f22, and the focal length of the vehicle-mounted ADAS lens 1000 is f, wherein: 1.5<f11 / f<2.5, 3<f22 / f<6.5, so that the field of view of the vehicle-mounted ADAS lens 1000 reaches more than 130°, the aperture number F value reaches 1.8, and the resolution reaches 3 million pixels.

[0047] The technical solution of the present invention, the technical solution provided by the present invention, by setting the second lens group 22 with positive optical focal length, assumes a larger optical focal length of the system, changes the propagation direction of the light beam, corrects the aberration of the off-axis field of view, and is more conducive to the imaging of the light beam on the image plane; by setting all lenses in the first lens group 11 and the second lens group 22 as glass spherical lenses, the aberration is effectively improved to maintain high resolution, and a higher imaging quality can be obtained in low illumination or night environments, and the glass material is also conducive to the temperature adaptability of the lens, so that the lens can work normally under a variety of working conditions, and by limiting the relationship between the focal length of each lens group and the focal length of the lens, various aberrations are corrected, the edge image quality is improved, and the imaging quality is high. In terms of aperture, the aperture value f satisfies 1.8≤f≤2.0, so that the field of view of the vehicle-mounted ADAS lens 1000 reaches more than 130°, the field of view is wider, and the data information obtained is more sufficient. The aperture number F value reaches 1.8, and the lens can also clearly image in weak light. The resolution reaches three million pixels, realizing a vehicle-mounted ADAS lens 1000 with a large viewing angle, large aperture, small chromatic aberration, small distortion, and clear imaging in weak light environments.

[0048] Furthermore, the vehicle-mounted ADAS lens 1000 further includes an aperture 8, which is disposed between the first lens group 11 and the second lens group 22. The aperture 8 limits the aperture of the light beam on the optical axis, intercepts part of the light, thereby reducing the light spot, improving the image contrast, and also expanding the target surface and improving the image quality. According to the actual situation, adjusting the light flux of the aperture 8 helps to further improve the imaging quality.

[0049] Furthermore, the vehicle-mounted ADAS lens 1000 also includes a filter 9 and a protective glass 10. The filter 9 is arranged on the side of the second lens group 22 facing the image side, and is used to filter out stray light in non-working bands. The protective glass 10 is arranged on the side of the filter 9 facing the image side. Among them, the filter 9 is used to reduce optical noise and reduce difficulties for the subsequent photoelectric module processing part. The filter 9 can also be used to adjust the color of the object image during the final imaging. The protective glass 10 can play the role of waterproofing, dustproofing, and protecting the lens, thereby enhancing the anti-interference ability of the vehicle-mounted ADAS lens 1000 and improving the imaging quality.

[0050] In one embodiment of the present invention, please refer to Figure 1 and Figure 5 Specifically, the first lens group 11 includes a first lens 1 with negative optical focal power, a second lens group 22 with negative optical focal power, a third lens 3 with positive optical focal power, and a fourth lens 4 with positive optical focal power, which are arranged in sequence from the object side to the image side; the second lens group 22 includes a fifth lens 5 with positive optical focal power, a sixth lens 6 with negative optical focal power, and a seventh lens 7 with positive optical focal power, which are arranged in sequence from the object side to the image side.

[0051] It should be noted that the vehicle-mounted ADAS lens 1000 also includes a vignetting stop a. By setting the vignetting stop a, the distribution of light entering the lens can be adjusted or limited to ensure that the illumination in the entire field of view is more uniform, thereby avoiding unnecessary light loss and optimizing the imaging quality. The present invention does not limit the specific position of the vignetting stop a. In the two embodiments provided by the present invention, please refer to Figure 1 and Figure 6 In the first embodiment, the vignetting stop a is disposed between the first lens 1 and the second lens 2 , and in the second embodiment, the vignetting stop a is disposed between the third lens 3 and the fourth lens 4 .

[0052] Furthermore, in order to improve the image quality of the optical system, reduce the loss of light energy, increase the image clarity, protect the scale surface, and further optimize the processing flow to meet the design requirements, in this embodiment, the fifth lens 5 and the sixth lens 6 are glued together. In this way, the glued parts are used reasonably and the optical focal length is reasonably allocated, which can well correct the aberration and achieve the effect of high and low temperature athermalization. It also effectively reduces the chromatic aberration so that the imaging confocal plane of the visible light band and the near infrared band can be clear at the same time.

[0053] In one embodiment of the present invention, 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 lens glued by the fifth lens 5 and the sixth lens 6 is f56, the focal length of the seventh lens 7 is f7, and the focal length of the vehicle-mounted ADAS lens 1000 is f, wherein: -2<f1 / f<-1, -25<f2 / f<-10, 1<f3 / f<3, 4<f4 / f<9, 6<f56 / f<11, 4<f7 / f<10. This embodiment is a preferred embodiment. By combining different lenses and reasonably allocating their optical focal lengths, the entire optical system has good performance such as low cost and high pixel. By limiting 6<f56 / f<11, the total length of the vehicle-mounted ADAS lens 1000 with a full glass spherical surface can be controlled, and the system chromatic aberration can be corrected to a certain extent.

[0054] In one embodiment of the present invention, the refractive index of the first lens 1 is n1, the refractive index of the second lens 2 is n2, the refractive index of the third lens 3 is n3, the focal refractive index of the fourth lens 4 is n4, the refractive index of the fifth lens 5 is n5, the refractive index of the sixth lens 6 is n6, and the refractive index of the seventh lens 7 is n7, wherein: 1.80≤n1, 1.75≤n2≤2.10, 1.75≤n3≤2.10, 1.60≤n4≤1.70, 1.55≤n5≤1.60, 1.90≤n6≤2.00, 1.60≤n7≤1.70. This embodiment is a preferred embodiment. By combining different lenses and reasonably allocating their refractive indices, the vehicle-mounted ADAS lens 1000 has the performance of low cost, high pixel, and clear imaging in a weak light environment. By limiting 1.80≤n1, light within a wider viewing angle range can be effectively converged, the aperture of the first lens 1 can be reduced, and the miniaturization of the optical lens can be achieved.

[0055] In one embodiment of the present invention, D1 is the aperture of the first lens 1, r2 is the curvature radius of the image side surface of the first lens 1, r4 is the curvature radius of the object side surface of the second lens 2, r5 is the curvature radius of the image side surface of the second lens 2, r6 is the curvature radius of the object side surface of the third lens 3, r7 is the curvature radius of the image side surface of the third lens 3, r8 is the curvature radius of the object side surface of the fourth lens 4, r9 is the curvature radius of the image side surface of the fourth lens 4, and r11 is the curvature radius of the object side surface of the fifth lens 5. The curvature radius of the image side surface of the fifth lens 5 is r12, r13 is the curvature radius of the image side surface of the sixth lens 6, r14 is the curvature radius of the object side surface of the seventh lens 7, and r15 is the curvature radius of the image side surface of the seventh lens 7, wherein: 1<D1 / r2<2, 0.5≤r5 / r4≤1.5, -6≤r7 / r6≤-1, 1≤r8 / r9≤6, -2≤r12 / r11≤-0.1, 2≤r13 / r12≤5, -4≤r15 / r14≤-2. By limiting 1<D1 / r2<2, the super-hemispherical risk of the first lens 1 can be effectively controlled, which is beneficial to the processing of the first lens 1. At the same time, the first lens 1 has a certain curvature, which can correct the aberration of the optical system to a certain extent. By limiting 1≤r8 / r9≤6, the distortion can be controlled, and the aberration of the system can be corrected to a certain extent. By limiting -4≤r15 / r14≤-2, ghost images caused by reflections of the optical filter 9 and the seventh lens 7 can be controlled, which is beneficial to further improving the imaging quality.

[0056] It should be noted that the basic parameter table of the vehicle-mounted ADAS lens 1000 in one embodiment provided by the present invention is shown in Table 1, wherein the unit of curvature is mm-1, and the unit of thickness is mm.

[0057] Table 1

[0058]

[0059]

[0060] Please refer to Figure 2 , is a schematic diagram of the MTF curve of the vehicle-mounted ADAS lens 1000 in the visible light band of this embodiment, which shows the imaging quality of three wavelengths of light, wherein the horizontal axis represents the number of line pairs, and the vertical axis represents the resolution capability, wherein the higher the value of the vertical axis, the stronger the resolution capability and the higher the image quality restoration degree, wherein the MTF values ​​are all greater than 0.3, which basically meets the imaging quality requirements.

[0061] Please refer to Figure 3 , is a schematic diagram of the defocus of the vehicle-mounted ADAS lens 1000 at 25°C in this embodiment, wherein the abscissa is the defocus amount in millimeters, and the ordinate is the contrast. Figure 3 It can be seen that the defocus of this lens does not exceed 0.01mm, and it can basically achieve a non-defocus state.

[0062] Please refer to Figure 4 , is a schematic diagram of the lateral chromatic aberration curve of the vehicle-mounted ADAS lens 1000 in the visible light band in this embodiment, Figure 4 It can be seen that the maximum lateral chromatic aberration is controlled within the range of 5μm, which shows that the imaging quality of this lens is high and the chromatic aberration band is well corrected.

[0063] Please refer to Figure 5 , is a schematic diagram of the field curvature distortion of the vehicle-mounted ADAS lens 1000 in this embodiment. Different colors represent different wavelengths. The right curve of the same color is the meridian direction, and the left curve is the sagittal field curvature. From the figure, the sagittal field curvature of this lens is no more than 0.06mm, indicating that this lens can correct chromatic aberration well. Another curve in the figure is the distortion curve of the system. The distortion does not affect the clarity of the system, but it will cause the image of the system to deform. It can be seen from the figure that the optical distortion of this lens is low.

[0064] In this embodiment, the optical assembly of the vehicle-mounted ADAS lens 1000 is 23.1mm, the aperture value is 1.85, and the maximum image surface is 7.5mm. Among them, the Abbe number of the first lens 1, the fourth lens 4 and the fifth lens 5 is greater than 50, and they are high-dispersion glass lenses. The refractive index of the first lens 1, the second lens 2, the third lens 3 and the sixth lens 6 is greater than 1.8, and they are high-refractive-index lenses, which ensures that various aberrations of the lens are corrected, improves edge image quality, and has high imaging quality. The lens has a large field of view and has the characteristics of a large aperture, and can also produce clear images in weak light.

[0065] The following are specific values ​​of relevant parameters in this embodiment: D1 / r2=1.530, r5 / r4=1.343, r7 / r6=-5.239, r8 / r9=4.352, r12 / r11=-0.250, r13 / r12=2.660, r15 / r14=-2.988, f1 / f=-1.475, f2 / f=-13.309, f3 / f=2.577, f4 / f=4.631, f56 / f=8.714, f7 / f=8.525.

[0066] It should be noted that the basic parameter table of the vehicle-mounted ADAS lens 1000 in another embodiment provided by the present invention is shown in Table 2, where the unit of curvature is mm. -1 , the unit of thickness is mm.

[0067] Table 2

[0068]

[0069] Please refer to Figure 7 , is a schematic diagram of the MTF curve of the vehicle-mounted ADAS lens 1000 in the visible light band of this embodiment, which shows the imaging quality of three wavelengths of light, wherein the horizontal axis represents the number of line pairs, and the vertical axis represents the resolution capability, wherein the higher the value of the vertical axis, the stronger the resolution capability and the higher the image quality restoration degree, wherein the MTF values ​​are all greater than 0.4, which basically meets the imaging quality requirements.

[0070] Please refer to Figure 8 , is a schematic diagram of the defocus of the vehicle-mounted ADAS lens 1000 at 25°C in this embodiment, wherein the abscissa is the defocus amount in millimeters, and the ordinate is the contrast. Figure 3 It can be seen that the defocus of this lens does not exceed 0.01mm, and it can basically achieve a non-defocus state.

[0071] Please refer to Fig. 9 , is a schematic diagram of the lateral chromatic aberration curve of the vehicle-mounted ADAS lens 1000 in the visible light band in this embodiment, Figure 4 It can be seen that the maximum lateral chromatic aberration is controlled within the range of 5μm, which shows that the imaging quality of this lens is high and the chromatic aberration band is well corrected.

[0072] Please refer to Fig.10 , is a schematic diagram of the field curvature distortion of the vehicle-mounted ADAS lens 1000 in this embodiment. Different colors represent different wavelengths. The right curve of the same color is the meridian direction, and the left curve is the sagittal field curvature. From the figure, the sagittal field curvature of this lens is no more than 0.06mm, indicating that this lens can correct chromatic aberration well. Another curve in the figure is the distortion curve of the system. The distortion does not affect the clarity of the system, but it will cause the image of the system to deform. It can be seen from the figure that the optical distortion of this lens is low.

[0073] In this embodiment, the optical assembly of the vehicle-mounted ADAS lens 1000 is 23.2mm, the aperture value is 1.83, and the maximum image surface is 7.5mm. Among them, the Abbe number of the fifth lens 5 and the seventh lens 7 is greater than 50, and they are high-dispersion glass lenses. The refractive index of the first lens 1, the second lens 2, the third lens 3 and the sixth lens 6 is greater than 1.8, and they are high-refractive-index lenses, which ensures that various aberrations of the lens are corrected, improves the edge image quality, and has high imaging quality. The lens has a large field of view and has the characteristics of a large aperture, and can also produce clear images in weak light.

[0074] The following are specific values ​​of relevant parameters in this embodiment: D1 / r2=1.374, r4 / r5=1.222, r7 / r6=-0.995, r8 / r9=1.000, r12 / r11=-0.226, r13 / r12=2.432, r14 / r15=-2.692, f1 / f=-1.399, f2 / f=-23.237, f3 / f=1.865, f4 / f=8.363, f56 / f=9.548, f7 / f=5.511.

[0075] The present invention further proposes a vehicle, comprising the above-mentioned on-vehicle ADAS lens 1000. Since the vehicle comprises the on-vehicle ADAS lens 1000, the specific structure of the on-vehicle ADAS lens 1000 refers to the above-mentioned embodiment. Since the on-vehicle ADAS lens 1000 of the vehicle adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0076] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A vehicle-mounted ADAS lens, characterized in that: The vehicle-mounted ADAS lens has an object side and an image side that are arranged opposite to each other along the optical axis direction. The vehicle-mounted ADAS lens includes a first lens group with positive optical focal power and a second lens group with positive optical focal power, which are arranged in sequence from the object side to the image side. All lenses in the first lens group and the second lens group are configured as glass spherical lenses. The focal length of the first lens group is f11, the focal length of the second lens group is f22, and the focal length of the vehicle-mounted ADAS lens is f, wherein: 1.5<f11 / f<2.5, 3<f22 / f<6.5, so that the field of view angle of the vehicle-mounted ADAS lens reaches more than 130°, the aperture number F value reaches 1.8, and the resolution reaches 3 million pixels.

2. The vehicle-mounted ADAS lens according to claim 1, characterized in that: The vehicle-mounted ADAS lens further includes an aperture, and the aperture is arranged between the first lens group and the second lens group.

3. The vehicle-mounted ADAS lens according to claim 1, characterized in that: The vehicle-mounted ADAS lens also includes a filter and a protective glass. The filter is arranged on one side of the second lens group facing the image side and is used to filter out stray light in non-working bands. The protective glass is arranged on one side of the filter facing the image side.

4. The vehicle-mounted ADAS lens according to claim 1, characterized in that: The first lens group includes a first lens with negative optical power, a second lens group with negative optical power, a third lens with positive optical power, and a fourth lens with positive optical power, which are arranged in sequence from the object side to the image side; The second lens group includes a fifth lens with positive optical power, a sixth lens group with negative optical power, and a seventh lens with positive optical power, which are arranged in sequence from the object side to the image side.

5. The vehicle-mounted ADAS lens according to claim 4, characterized in that: The fifth lens and the sixth lens are glued together, the focal length of the lens glued together by the fifth lens and the sixth lens is f56, and the focal length of the vehicle-mounted ADAS lens is f, wherein: 5<f56 / f<10.

6. The vehicle-mounted ADAS lens according to claim 5, characterized in that: The first lens is a concave-convex lens, and its object side surface is convex; The second lens is a meniscus lens, and its object side surface is concave; The third lens is a biconvex lens; The fourth lens is a meniscus lens, and its object side surface is concave; The fifth lens is a biconvex lens; The sixth lens is a meniscus lens, and its object side surface is concave; The seventh lens is a biconvex lens.

7. The vehicle-mounted ADAS lens according to claim 6, characterized in that: 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 lens bonded together by the fifth lens and the sixth lens is f56, the focal length of the seventh lens is f7, and the focal length of the vehicle-mounted ADAS lens is f, wherein: -2<f1 / f<-1, -25<f2 / f<-10, 1<f3 / f<3, 4<f4 / f<9, 6<f56 / f<11, 4<f7 / f<10.

8. The vehicle-mounted ADAS lens according to claim 6, characterized in that: The refractive index of the first lens is n1, the refractive index of the second lens is n2, the refractive index of the third lens is n3, the focal refractive index of the fourth lens is n4, the refractive index of the fifth lens is n5, the refractive index of the sixth lens is n6, and the refractive index of the seventh lens is n7, wherein: 1.80≤n1, 1.75≤n2≤2.10, 1.75≤n3≤2.10, 1.60≤n4≤1.70, 1.55≤n5≤1.60, 1.90≤n6≤2.00, and 1.60≤n7≤1.

70.

9. The vehicle-mounted ADAS lens according to claim 6, characterized in that: D1 is the aperture of the first lens, r2 is the curvature radius of the image side surface of the first lens, r4 is the curvature radius of the object side surface of the second lens, r5 is the curvature radius of the image side surface of the second lens, r6 is the curvature radius of the object side surface of the third lens, r7 is the curvature radius of the image side surface of the third lens, r8 is the curvature radius of the object side surface of the fourth lens, r9 is the curvature radius of the image side surface of the fourth lens, r11 is the curvature radius of the object side surface of the fifth lens, r1 r2 is the curvature radius of the image-side surface of the fifth lens, r13 is the curvature radius of the image-side surface of the sixth lens, r14 is the curvature radius of the object-side surface of the seventh lens, and r15 is the curvature radius of the image-side surface of the seventh lens, wherein: 1<D1 / r2<2, 0.5≤r5 / r4≤1.5, -6≤r7 / r6≤-1, 1≤r8 / r9≤6, -2≤r12 / r11≤-0.1, 2≤r13 / r12≤5, -4≤r15 / r14≤-2.

10. A vehicle, characterized in that: The invention comprises the vehicle-mounted ADAS lens as described in any one of claims 1 to 9.

Images