Toric wide-angle lens and rearview mirror assembly

Abstract

The invention discloses a toric wide-angle lens and a rearview mirror assembly, the toric wide-angle lens comprises a lens body and a reflecting layer, the surface of the lens body is divided into a main mirror surface area and a wide-angle surface area, the curvature radius of the main mirror surface area gradually changes in the transverse direction and the longitudinal direction, and the curvature radius of the wide-angle surface area gradually changes in the transverse direction and the longitudinal direction. The curvature radius of the wide-angle face area is gradually changed in the transverse direction and the longitudinal direction, and the minimum curvature radius of the wide-angle face area is smaller than the minimum curvature radius of the main mirror face area. And the reflecting layer is integrally laid on the convex surface and / or the concave surface of the lens body. According to the invention, the main mirror surface area and the wide-angle surface area are reasonably divided, and different curvature radiuses are set, so that the purpose of simultaneously expanding the visual field in the transverse axis direction and the longitudinal axis direction is achieved. The selection and laying of the reflecting layer further improve the imaging quality and adaptability of the lens. Compared with a traditional rearview mirror lens, the rearview mirror lens has the advantages that the view blind area is effectively reduced, and the risk of safety accidents caused by incomplete observation is reduced.

Description

Technical Field

[0001] This application relates to the technical field of rearview mirror lenses, and particularly relates to a toric wide-angle lens and a rearview mirror assembly. Background Art

[0002] With the rapid development of the automotive industry, the number of automobiles in use and the variety of vehicle types have been continuously increasing. As an important means of transportation for people's daily travel, the safety and driving convenience of automobiles have attracted much attention. As an important safety component of automobiles, the rearview lens plays a crucial role in enabling drivers to observe the environment behind and on the sides of the vehicle. Good rearview lens performance allows drivers to promptly grasp the surrounding road conditions and make accurate driving decisions, thereby ensuring driving safety. To meet different driving needs and vehicle designs, rearview lens technology has also been continuously evolving, and various types of rearview lenses have emerged. These new rearview lenses have improved the driver's field of vision to a certain extent, but there are still some problems to be solved.

[0003] In traditional rearview lens technology, in order to expand the field of vision, some conventional means are usually adopted. For example, some use lenses with a single-curved surface design, attempting to increase the field of vision in a certain direction in this way; others set multiple small lenses or auxiliary lenses on the lens to make up for the insufficient field of vision of the main lens. In addition, some lenses optimize light reflection by changing the material or surface treatment, hoping to improve the field of vision clarity. However, most of these means are improvements for a certain direction or a specific situation, lacking comprehensive consideration of the overall field of vision.

[0004] There are obvious defects in current traditional rearview lenses. Due to limitations such as the lens curved surface design, it is difficult for traditional rearview lenses to achieve a wide-angle effect simultaneously in the horizontal and vertical axes. During actual driving, especially when reversing, drivers need to observe the ground conditions on the side and rear to avoid colliding with obstacles, pedestrians, etc. However, the problem of the small horizontal or vertical field of vision of traditional rearview lenses results in drivers being unable to comprehensively and clearly obtain information about the ground on the side and rear, with a large field of vision blind area, greatly increasing the risk of safety accidents. Summary of the Invention

[0005] In order to solve the technical problems in the prior art, this application provides a toric wide-angle lens and a rearview mirror assembly.

[0006] The toric wide-angle lens and rearview mirror assembly provided by this application adopt the following technical solutions: This application provides a toric wide-angle lens, including a lens body and a reflective layer. The surface of the lens body is divided into a main mirror surface area and a wide-angle surface area, where: The radius of curvature of the main mirror surface area gradually changes both transversely and longitudinally. The radius of curvature of the wide-angle surface area also gradually changes both transversely and longitudinally, and the minimum radius of curvature of the wide-angle surface area is smaller than the minimum radius of curvature of the main mirror surface area; The reflective layer is entirely laid on the convex surface and / or concave surface of the lens body.

[0007] In some embodiments, the main mirror surface area and the wide-angle surface area are smoothly transitioned through a tangent surface.

[0008] In some embodiments, the range of the radius of curvature of the main mirror surface area transversely is SR1380mm ± 60mm, and the range of the radius of curvature of the main mirror surface area longitudinally is SR1080mm ± 60mm; The range of the radius of curvature of the wide-angle surface area transversely is SR1380mm ± 30mm, and the range of the radius of curvature of the wide-angle surface area longitudinally is SR1080mm ± 30mm.

[0009] In some embodiments, the radius of curvature of the wide-angle surface area transversely satisfies the following gradient mapping formula: wherein, R is the radius of curvature at the contact of the main mirror surface area and the wide-angle surface area, k is the taper coefficient, a is the abscissa value at the contact of the main mirror surface area and the wide-angle surface area, and x represents the abscissa value of any point on the wide-angle surface area.

[0010] In some embodiments, the reflective layer covers all the outer surfaces of the lens body, and the manufacturing material thereof is selected from at least one of chromium, titanium, aluminum, silver, blue mirror or electrochromic material.

[0011] This application also provides a rearview mirror assembly, including the aspherical wide-angle lens described above. An electrochromic coating is coated on the surface of the aspherical wide-angle lens, and the electrochromic coating is divided into several independent small area units; The rearview mirror assembly further includes a housing, a light intensity detection mechanism, a light source positioning mechanism, a brightness control mechanism and a control unit. The aspheric wide-angle lens is installed on the housing. The light intensity detection mechanism includes a front light intensity detector and a rear light intensity detector. The front light intensity detector and the rear light intensity detector are respectively arranged on the front and rear sides of the housing for detecting the light intensity in front of and behind the vehicle. The light source positioning mechanism includes three light source positioning cameras, which are distributed in a triangle on the housing for collecting the rear environment image and positioning the strong light source. The brightness control mechanism includes a number of current control components, and each small area unit corresponds to a current control component for independently adjusting the light transmittance of each small area unit. The control unit is respectively communicatively connected to the front light intensity detector, the rear light intensity detector camera, the three light source positioning cameras and each current control component, and can perform the following operations: When the ratio of the detection value of the rear light intensity detector to the detection value of the front light intensity detector is greater than 1 and the absolute value of the difference between the two exceeds a preset value, it is determined that there is a strong light source behind the rearview mirror assembly; Calculate the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly based on the binocular vision positioning algorithm, and determine the incident angle of the strong light source according to the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly; According to the incident angle of the strong light source, the preset driver's eye position and the normal direction of the small area unit, predict the light intensity reflected by each small area unit to the driver's eyes; Dynamically adjust the drive current of each current control component so that the light intensity reflected by each small area unit to the driver's eyes does not exceed the preset light intensity.

[0012] Preferably, calculating the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly based on the binocular vision positioning algorithm specifically includes: Determine the focal length and principal point coordinates of each light source positioning camera, and determine the relative position and attitude between the three light source positioning cameras; The three light source positioning cameras simultaneously capture the rear scene image, detect the high-brightness area in the image, and locate the centroid coordinates of the light spot; determine the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly according to the centroid coordinates of each light spot.

[0013] Preferably, the calculation formula for the incident angle α of the strong light source is: Wherein, is the vector from the strong light source to the rearview mirror assembly, is the normal direction vector of the rearview mirror.

[0014] Preferably, the prediction model for predicting the light intensity reflected by each small area unit to the driver's eyes is: Among them, I source is the light intensity of the strong light source, which is obtained by the rear light intensity detector. α is the incident angle of the strong light source determined by the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly. τ is the light transmittance of the small area unit. d is the distance from the strong light source to the small area unit. Ω is the tilt angle of the driver's eye position relative to the rearview mirror assembly.

[0015] Preferably, when the ratio of the detection value of the rear light intensity detector to the detection value of the front light intensity detector is greater than 1 and the absolute value of the difference between the two exceeds 100 lux, it is determined that there is a strong light source behind the rearview mirror assembly.

[0016] In summary, the present application includes at least one of the following beneficial technical effects: 1. By reasonably dividing the main mirror area and the wide-angle area, setting different curvature radii, and using smooth transition and a specific curvature gradient formula, the purpose of expanding the field of view in both the horizontal and vertical axes is achieved. The selection and laying of the reflective layer further improve the imaging quality and adaptability of the lens. Compared with traditional rearview lenses, it effectively reduces the visual blind area and the risk of safety accidents caused by incomplete observation, providing a safer and more convenient driving experience for the driver, which is an important improvement to the existing rearview lens technology; 2. The rearview mirror assembly combines a complex-curved wide-angle lens and electrochromic technology. Through the coordinated work of the light intensity detection mechanism, the light source positioning mechanism, and the brightness control mechanism, as well as the intelligent adjustment of the control unit, it can dynamically adjust the reflected light intensity of each area of the rearview mirror according to the situation of the strong light source behind. This design effectively avoids the interference of strong light to the driver, improves the observation clarity and comfort of the driver under different lighting conditions, and greatly reduces the visual fatigue and safety hazards caused by strong light reflection, which is a major innovation and improvement to the traditional rearview mirror technology, providing a more safe and reliable driving assistance for the driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a complex-curved wide-angle lens provided by an embodiment of the present application; Figure 2 is Figure 1 a cross-sectional view of the complex-curved wide-angle lens in FIG. Figure 3 is a mirror imaging effect diagram of the field of view observed vertically at a 90° angle; Figure 4 is a mirror imaging effect diagram of the field of view observed at a 30° angle; Figure 5 is a schematic structural diagram of a rearview mirror assembly provided by an embodiment of the present application; Figure 6 is Figure 5 a rear view of the rearview mirror assembly in FIG. Figure 7 is Figure 5 a sectional view taken along the A-A cross-section; Figure 8 is Figure 7 a partially enlarged view of area B in the figure; Explanation of reference numerals: 1, toric wide-angle lens; 11, lens body; 111, main mirror surface area; 112, wide-angle surface area; 12, reflective layer; 121, small area unit; 2, housing; 3, light intensity detection mechanism; 31, front light intensity detector; 32, rear light intensity detector; 4, light source positioning mechanism; 41, light source positioning camera; 5, brightness control mechanism; 51, current control component; 6, control unit. Detailed implementation manners

[0018] The following further elaborates on this application Figures 1-8 in conjunction with the accompanying drawings.

[0019] An embodiment of this application discloses a toric wide-angle lens 1. Referring to Figure 1 and Figure 2 , the toric wide-angle lens 1 includes a lens body 11 and a reflective layer 12. Among them, the surface of the lens body 11 is divided into a main mirror surface area 111 and a wide-angle surface area 112. The radius of curvature of the main mirror surface area 111 gradually changes both horizontally and vertically, and the radius of curvature of the wide-angle surface area 112 also gradually changes both horizontally and vertically. Moreover, the minimum radius of curvature of the wide-angle surface area 112 is smaller than the minimum radius of curvature of the main mirror surface area 111. The reflective layer 12 is entirely disposed on the convex surface and / or concave surface of the lens body 11. Such a design enables the lens to achieve a better wide-angle effect in both the horizontal and vertical directions, expands the driver's field of vision, reduces the visual blind area, and effectively reduces the risk of safety accidents. This is because the reasonable setting of the radius of curvature in different areas allows light to be reflected at different angles, thereby increasing the observable range.

[0020] Specifically, the main mirror surface area 111 and the wide-angle surface area 112 of the lens body 11 together constitute the imaging area of the entire lens. The main mirror surface area 111 is usually the area that the driver mainly observes during normal driving, and it can provide a relatively real and accurate rear image. The surface of the main mirror surface area 111 is relatively smooth, and its structure is like a slightly curved flat glass. In terms of material, glass materials with good optical properties are generally used. Of course, some high-strength plastic materials can also be used as long as their transparency and stability can be ensured. The wide-angle surface area 112 is a specially designed part to expand the field of view. Its curved surface is more curved. The wide-angle surface area 112 can be set at any position on the lens body 11. For example, it can be set in the left area of the lens body 11, or in the right area, upper area or lower area of the lens body 11. It can collect light at more angles compared to the main mirror surface area 111. In terms of material selection, glass or plastic can also be used, but higher requirements are placed on the uniformity of its optical properties. The main mirror surface area 111 and the wide-angle surface area 112 are connected at the contact point, and the transition between them should be smooth to avoid sudden changes during light reflection and affect the driver's observation. The connection method here can be through an integrated molding method using a mold to perfectly fuse two curved surfaces with different curvatures together.

[0021] The main mirror surface area 111 and the wide-angle surface area 112 are smoothly transitioned through a tangent surface. This transition method makes the reflection of light on the lens surface more natural and continuous, without obvious demarcation lines, further improving the imaging quality and visual effect. This is like two curves perfectly connecting at a certain point without abrupt turns. The light is reflected along this smooth transition area, enabling the driver to see a more coherent picture. In actual production, this smooth transition of the tangent surface can be achieved through high-precision mold processing and polishing techniques.

[0022] The curvature is set to change in a form of a converging ring in all directions on the surface of the lens body, so that different smooth viewing angle functions are presented on the lens surface, forming a converging ring reflection imaging and making the field of view clear and regular. As Figure 3 shown, when observing the field of view at a 90° vertical angle, the grid is effectively converged. After being reflected by the lens, it has the effect of expanding the driver's viewing angle; as Figure 4 shown, when observing the field of view at a 30° angle, the grid is strongly converged. After being reflected by the lens, it has the effect of widely expanding the driver's viewing angle, solving the problems of side blind spots and rear-wheel ground blind spots when the driver observes the rearview mirror for oncoming vehicles from behind, reducing the occurrence of traffic accidents; the present invention also reduces the manufacturing cost of the lens, improves the overall working efficiency and stability.

[0023] The radius of curvature range of the main mirror area 111 in the transverse direction is SR1380mm ± 60mm, and the radius of curvature range in the longitudinal direction is SR1080mm ± 60mm; the radius of curvature range of the wide-angle area 112 in the transverse direction is SR1380mm ± 30mm, and the radius of curvature range in the longitudinal direction is SR1080mm ± 30mm. Such precise settings of the radius of curvature range are to ensure that the main mirror area 111 and the wide-angle area 112 each perform their best functions. The relatively large radius of curvature change range of the main mirror area 111 can ensure stable and accurate imaging; while the relatively small radius of curvature change range of the wide-angle area 112 can achieve a wider field of view expansion. For example, when the driver needs to observe a vehicle in the distance, the main mirror area 111 can clearly present the target; while when it is necessary to check the ground conditions in the side and rear nearby, the wide-angle area 112 can come in handy.

[0024] In some embodiments, the radius of curvature change range of the main mirror area 111 in the longitudinal direction is reduced, thereby increasing the field of view of the longitudinal axis and enabling the observation of the ground conditions; the radius of curvature change range of the wide-angle area 112 in the transverse direction is reduced, thereby increasing the field of view of the transverse axis and enabling the observation of the side vehicles; while magnifying the lens surface presents different viewing angles, thereby increasing driving safety.

[0025] The transverse axis radius of curvature of the wide-angle area 112 satisfies the following gradient mapping formula: Wherein, R is the radius of curvature at the contact between the main mirror area 111 and the wide-angle area 112, k is the taper coefficient, a is the abscissa value at the contact between the main mirror area 111 and the wide-angle area 112, and x represents the abscissa value of any point on the wide-angle area 112.

[0026] This formula accurately describes the gradient law of the transverse axis radius of curvature of the wide-angle area 112. By reasonably adjusting the parameters in the formula, the field of view expansion effect of the wide-angle area 112 can be optimized. For example, changing the value of the taper coefficient k can change the change speed of the radius of curvature, so as to meet the requirements of different vehicle models and driving needs.

[0027] The reflective layer 12 covers the entire outer surface of the lens body 11, and the manufacturing material thereof is selected from at least one of chromium, titanium, aluminum, silver, blue mirror or electrochromic material. The function of the reflective layer 12 is to reflect light back into the driver's eyes, and different materials have different reflection characteristics. Taking aluminum as an example, it has a high reflectivity and can efficiently reflect light, making the lens imaging brighter and clearer; while electrochromic materials can automatically adjust the reflectivity according to the intensity of external light, improving the observation comfort of the driver under different lighting conditions. The reflective layer 12 can be laid by processes such as vacuum coating to ensure that it evenly covers the surface of the lens body 11.

[0028] The implementation principle of the toric wide-angle lens 1 disclosed in this embodiment is as follows: The toric wide-angle lens 1 of this embodiment realizes the purpose of expanding the field of view in both the horizontal and vertical axes by reasonably dividing the main mirror surface area 111 and the wide-angle surface area 112, setting different curvature radii, and adopting smooth transition and specific curvature gradient formulas. The selection and laying of the reflective layer 12 further improve the imaging quality and adaptability of the lens. Compared with traditional rear-view lenses, it effectively reduces the visual blind area and reduces the risk of safety accidents caused by incomplete observation, providing a safer and more convenient driving experience for the driver, which is an important improvement to the existing rear-view lens technology.

[0029] The present invention also provides a manufacturing method of the toric wide-angle lens as described above, including the following steps: Step 1: Place the unformed transparent glass on the hot bending mold, with the concave surface facing up or down and fixed, and use the method of gravity forming after heating or gravity plus vacuum assistance after heating or hot pressing after thermoforming to make the surface of the transparent glass meet the curvature requirements in all directions; Step 2, perform a cleaning treatment on the thermoformed transparent glass; Step 3, deposit the overall coating layer on the surface of the thermoformed transparent glass; Step 4, use the method of laser cutting or blade cutting to fix the horizontal and vertical axes of the glass to coincide with the horizontal and vertical axes of the cut lens in the same direction, and cut the contour into the required contour shape.

[0030] Preferably, in Step 4, it further includes a peripheral grinding treatment on the cut transparent glass.

[0031] Please refer to Figures 5-8 , this application also provides a rearview mirror assembly, including the above toric wide-angle lens 1, and an electrochromic coating is coated on the surface of the toric wide-angle lens 1, and the electrochromic coating is divided into several independent small area units 121. In addition, the rearview mirror assembly further includes a housing 2, a light intensity detection mechanism 3, a light source positioning mechanism 4, a brightness control mechanism 5 and a control unit 6.

[0032] The aspherical wide-angle lens 1 is installed in the housing 2 to provide protection and support for it. The light intensity detection mechanism 3 includes a front light intensity detector 31 and a rear light intensity detector 32, which are respectively arranged on the front and rear sides of the housing 2 and are used to detect the light intensity in front of and behind the vehicle. The light source positioning mechanism 4 includes three light source positioning cameras 41, which are distributed on the housing 2 in a triangular shape and are used to collect the rear environment image and locate the strong light source. The brightness control mechanism 5 includes a number of current control components 51, and each small area unit 121 corresponds to a current control component 51, which is used to independently adjust the light transmittance of each small area unit 121. The control unit 6 is respectively communicatively connected to the front light intensity detector 31, the rear light intensity detector 32, the three light source positioning cameras 41 and each current control component 51, and can perform the following operations: S1. When the ratio of the detection value of the rear light intensity detector 32 to the detection value of the front light intensity detector 31 is greater than 1 and the absolute value of the difference between the two exceeds a preset value, it is determined that there is a strong light source behind the rearview mirror assembly; in this embodiment, when the ratio of the detection value of the rear light intensity detector 32 to the detection value of the front light intensity detector 31 is greater than 1 and the absolute value of the difference between the two exceeds 100 lux, it is determined that there is a strong light source behind the rearview mirror assembly.

[0033] S2. Calculate the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly based on the binocular vision positioning algorithm, and determine the incident angle of the strong light source according to the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly; S3. Predict the light intensity reflected from each small area unit 121 to the driver's eyes according to the incident angle of the strong light source, the preset driver's eye position and the normal direction of the small area unit 121; S4. Dynamically adjust the drive current of each current control component 51 so that the light intensity reflected from each small area unit 121 to the driver's eyes does not exceed the preset light intensity.

[0034] Through these operations, the reflected light intensity of each area of the rearview mirror can be dynamically adjusted according to the situation of the strong light source behind, avoiding interference caused by strong light to the driver and improving driving safety.

[0035] Specifically, the electrochromic coating of the aspherical wide-angle lens 1 is the key part to realize the adaptive adjustment. The electrochromic coating is like a layer of intelligent film, which can change its own color and light transmittance according to the magnitude of the passing current. Its material is usually some special metal oxides, such as tungsten oxide, etc. This coating is evenly coated on the lens surface, and its thickness is ensured to be consistent through a fine process to ensure the uniform color change effect in each area. The small area units 121 divided by the concave mirror are like independent small windows, and each small window can adjust its own light transmittance according to the actual situation. The division method can be a grid-like division according to certain rules, which is convenient for management and control.

[0036] The housing 2 serves to protect and fix other components. It is usually made of plastic or metal and has a certain strength and corrosion resistance. Structurally, there are dedicated mounting positions and channels inside the housing 2 for installing components such as lenses, light intensity detectors, and cameras, and to ensure smooth wire connections between them. For example, there are grooves and protrusions on the inner wall of the housing 2 to fix the lens and position the camera, and there are also wire grooves to facilitate the laying of wires.

[0037] The front light intensity detector 31 and the rear light intensity detector 32 of the light intensity detection mechanism 3 are like two sensitive eyes, constantly sensing the light intensity in front of and behind the vehicle. They generally use photosensitive sensors, which can quickly and accurately convert light signals into electrical signals. When installed, the front light intensity detector 31 is installed in a relatively open position in front of the housing 2 to avoid being blocked; the rear light intensity detector 32 is installed in a suitable position behind the housing 2 to ensure accurate detection of the rear light intensity.

[0038] The three light source positioning cameras 41 of the light source positioning mechanism 4 are distributed in a triangular shape. This layout can use the principle of triangulation to more accurately locate strong light sources. The cameras usually use high-resolution image sensors and can clearly capture images of the rear environment. They are installed on the housing 2, firmly fixed by brackets and fixing screws, and ensure that their shooting angles can cover a large range behind.

[0039] The current control components 51 of the light and darkness control mechanism 5 are like small commanders, responsible for adjusting the light transmittance of the small area units 121. Each current control component 51 is connected to the corresponding small area unit 121 and controls the state of the electrochromic coating by changing the magnitude of the output current. The current control component 51 usually consists of an electronic circuit and a control chip and has precise current adjustment capabilities.

[0040] The control unit 6 is the brain of the entire rearview mirror assembly. It receives signals from the light intensity detectors and cameras, and analyzes and processes them. The control unit 6 usually uses a high-performance microprocessor and has powerful computing and control capabilities. It is connected to each component through data lines to achieve data transmission and instruction issuance.

[0041] Based on the three-eye vision positioning algorithm, calculate the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly, specifically including determining the focal length and principal point coordinates of each light source positioning camera 41, and determining the relative positions and postures between the three light source positioning cameras 41. The three light source positioning cameras 41 simultaneously capture images of the rear scene, detect the high-brightness areas in the images, locate the centroid coordinates of the light spots, and then determine the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly according to the centroid coordinates of each light spot. This positioning method utilizes the collaborative work of the three cameras and accurately calculates the position of the strong light source through mathematical algorithms.

[0042] Among them, the specific method for determining the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly according to the centroid coordinates of each light spot includes: (1) Assume that the centroid coordinates of the light spot captured by the i-th light source positioning camera are (u i , v i ), and its normalized coordinates are: where fx and fy are the horizontal and vertical focal lengths of the light source positioning camera respectively, and (c x , c y ) are the principal point coordinates of the light source positioning camera.

[0043] (2) Construct a ray equation. The light direction corresponding to the centroid of the light spot in the camera coordinate system is: Convert it to the world coordinate system: The ray equation is: where R i and T i are the external parameter matrices that need to be calibrated in advance, λ is the ray parameter, and P world is an arbitrary point on the ray.

[0044] (3) If the rays of the three cameras intersect at the strong light source point P world =(X, Y, Z), it is necessary to satisfy: Solve this system of equations to obtain the coordinates of the strong light source point P world . That is, the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly can be determined The formula for determining the incident angle α of the strong light source is: where is the vector from the strong light source to the rearview mirror assembly, is the normal direction vector of the rearview mirror. Among them, the vector from the strong light source to the rearview mirror assembly can be obtained from the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly.

[0045] Through this formula, the incident angle of the strong light source can be accurately calculated, providing an important basis for predicting the reflected light intensity in the subsequent process.

[0046] The prediction model for predicting the light intensity reflected from each small area unit 121 to the driver's eyes is: where I source$I$ is the light intensity of the strong light source, obtained by the post-light intensity detector 32. $\alpha$ is the incident angle of the strong light source determined by the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly. $\tau$ is the light transmittance of the small area unit 121. $d$ is the distance from the strong light source to the small area unit 121. $\Omega$ is the tilt angle of the driver's eye position relative to the rearview mirror assembly.

[0047] This prediction model comprehensively considers various factors and can accurately predict the reflected light intensity, providing a scientific basis for dynamically adjusting the light transmittance of each small area unit 121.

[0048] The implementation principle of the rearview mirror assembly provided in this application is as follows: The rearview mirror assembly combines a complex curved wide-angle lens 1 and electrochromic technology. Through the coordinated operation of the light intensity detection mechanism 3, the light source positioning mechanism 4, and the brightness control mechanism 5, as well as the intelligent adjustment of the control unit 6, it can dynamically adjust the reflected light intensity of each area of the rearview mirror according to the situation of the strong light source behind. This design effectively avoids the interference of strong light on the driver, improves the observation clarity and comfort of the driver under different lighting conditions, greatly reduces the visual fatigue and safety hazards caused by strong light reflection, is a major innovation and improvement to the traditional rearview mirror technology, and provides a more safe and reliable driving assistance for the driver.

[0049] The specific implementation manners of the present application described above do not limit the protection scope of the present application. Any other corresponding changes and deformations made according to the technical concept of the present application shall be included in the protection scope of the present application.

Claims

1. An aspheric wide-angle lens (1), characterized in that, It includes a lens body (11) and a reflective layer (12). The surface of the lens body (11) is divided into a main mirror surface area (111) and a wide-angle surface area (112), where: The radius of curvature of the main mirror surface area (111) gradually changes both horizontally and vertically. The radius of curvature of the wide-angle surface area (112) also gradually changes both horizontally and vertically, and the minimum radius of curvature of the wide-angle surface area (112) is less than the minimum radius of curvature of the main mirror surface area (111); The reflective layer (12) is entirely coated on the convex surface and / or concave surface of the lens body (11).

2. The toric wide-angle lens (1) according to claim 1, wherein The main mirror surface area (111) and the wide-angle surface area (112) are smoothly transitioned through a tangent surface.

3. The toric wide-angle lens (1) according to claim 1, characterized in that, The range of the radius of curvature of the main mirror surface area (111) in the horizontal direction is SR1380mm ± 60mm, and the range of the radius of curvature of the main mirror surface area (111) in the vertical direction is SR1080mm ± 60mm; The range of the radius of curvature of the wide-angle surface area (112) in the horizontal direction is SR1380mm ± 30mm, and the range of the radius of curvature of the wide-angle surface area (112) in the vertical direction is SR1080mm ± 30mm.

4. The toric wide-angle lens (1) according to claim 3, characterized in that, The radius of curvature of the wide-angle surface area (112) in the horizontal direction satisfies the following gradient mapping formula: where R is the radius of curvature at the contact of the main mirror surface area (111) and the wide-angle surface area (112), k is the taper coefficient, a is the abscissa value at the contact of the main mirror surface area (111) and the wide-angle surface area (112), and x represents the abscissa value of any point on the wide-angle surface area (112).

5. The toric wide-angle lens (1) according to claim 1, wherein, The reflective layer (12) covers the entire outer surface of the lens body (11), and its manufacturing material is selected from at least one of chromium, titanium, aluminum, silver, blue mirror, or electrochromic material.

6. A rearview mirror assembly, characterized in that, It includes the aspherical wide-angle lens (1) as described in any one of claims 1-5. The surface of the aspherical wide-angle lens (1) is coated with an electrochromic coating, and the electrochromic coating is divided into several independent small area units (121); The rearview mirror assembly further includes a housing (2), a light intensity detection mechanism (3), a light source positioning mechanism (4), a brightness control mechanism (5), and a control unit (6). The aspheric wide-angle lens (1) is installed on the housing (2). The light intensity detection mechanism (3) includes a front light intensity detector (31) and a rear light intensity detector (32). The front light intensity detector (31) and the rear light intensity detector (32) are respectively arranged on the front and rear sides of the housing (2) for detecting the light intensity in front of and behind the vehicle. The light source positioning mechanism (4) includes three light source positioning cameras (41), and the three light source positioning cameras (41) are distributed in a triangular shape on the housing (2) for collecting the rear environment image and positioning the strong light source. The brightness control mechanism (5) includes a number of current control components (51), and each small area unit (121) corresponds to a current control component (51) for independently adjusting the light transmittance of each small area unit (121). The control unit (6) is respectively in communication connection with the front light intensity detector (31), the rear light intensity detector (32), the three light source positioning cameras (41), and each current control component (51), and can perform the following operations: When the ratio of the detection value of the rear light intensity detector (32) to the detection value of the front light intensity detector (31) is greater than 1 and the absolute value of the difference between the two exceeds a preset value, it is determined that there is a strong light source behind the rearview mirror assembly; Based on the binocular vision positioning algorithm, calculate the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly, and determine the incident angle of the strong light source according to the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly; According to the incident angle of the strong light source, the preset driver's eye position, and the normal direction of the small area unit (121), predict the light intensity reflected from each small area unit (121) to the driver's eyes; Dynamically adjust the drive current of each current control component (51) so that the light intensity reflected from each small area unit (121) to the driver's eyes does not exceed the preset light intensity.

7. The rearview mirror assembly according to claim 6, wherein, Based on the binocular vision positioning algorithm, calculating the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly specifically includes: Determine the focal length and principal point coordinates of each light source positioning camera (41), and determine the relative position and attitude between the three light source positioning cameras (41); The three light source positioning cameras (41) simultaneously capture the rear scene image, detect the high-brightness area in the image, and locate the centroid coordinates of the light spot; Determine the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly according to the centroid coordinates of each light spot.

8. The rearview mirror assembly according to claim 6, characterized in that, The calculation formula for the incident angle α of the strong light source is: Among them, is the vector from the strong light source to the rearview mirror assembly, is the normal direction vector of the rearview mirror.

9. The rearview mirror assembly according to claim 8, wherein, The prediction model for predicting the light intensity reflected from each small area unit (121) to the driver's eyes is: Among them, I source is the light intensity of the strong light source, which is obtained by the post-light intensity detector (32). α is the incident angle of the strong light source determined by the three-dimensional coordinates of the strong light source relative to the rearview mirror assembly. τ is the light transmittance of the small area unit (121). d is the distance from the strong light source to the small area unit (121). Ω is the tilt angle of the driver's eye position relative to the rearview mirror assembly.

10. The rearview mirror assembly according to claim 6, wherein, When the ratio of the detection value of the rear light intensity detector (32) to the detection value of the front light intensity detector (31) is greater than 1 and the absolute value of the difference between the two exceeds 100 lux, it is determined that there is a strong light source behind the rearview mirror assembly.

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