Blind area warning module for rearview mirror and automobile rearview mirror

Abstract

The present disclosure provides a rearview mirror blind area warning module and a rearview mirror. The rearview mirror blind area warning module comprises a mirror surface shell and a warning light assembly. The mirror surface shell is provided with a light collecting area. The warning light assembly comprises an outer shell, a special-shaped circuit board, a light source, a light uniformizing sheet and a light blocking adhesive layer. The special-shaped circuit board is installed on the outer shell, and the special-shaped circuit board is provided with a light channel. The light source is fixed on the special-shaped circuit board and faces a diffuse reflection surface formed on the inner side of the outer shell. The light channel corresponds to the reflection path of light. The light uniformizing sheet covers the special-shaped circuit board. The light blocking adhesive layer is bonded to the light uniformizing sheet and is provided with a light emitting window. The light blocking adhesive layer is bonded to the mirror surface shell. The light emitting window is arranged corresponding to the light collecting area. The light source is arranged opposite to the light emitting window and is reflected by the diffuse reflection surface. The light is fully reflected and mixed in the outer shell, so that the uniformity of the light emitted by the light source is greatly improved and the glare is reduced. The optical barrier of the light blocking adhesive layer makes the projected warning pattern clear and sharp.

Description

Technical Field

[0001] This disclosure relates to the technical field of automobile manufacturing, and in particular to a rearview mirror blind spot warning module and an automobile rearview mirror. Background Technology

[0002] With the current trend of automotive intelligence, safe driving technologies are becoming increasingly sophisticated, and the installation rate of blind spot warning lights in rearview mirrors is also increasing.

[0003] However, traditional warning lights mostly use a direct-light optical solution with LED beads, which has poor uniformity and is prone to glare and dark spots at the edges. This poses a risk that the lights may not be easily visible while driving, thus failing to provide the intended warning effect. Alternatively, they may use a reflector optical solution, but the reflector requires a large space, which poses a significant challenge to the compact design of rearview mirrors. This often reduces the space available for other functional components on the rearview mirror, affecting its miniaturization and multi-functional design.

[0004] For example, prior art document CN201920658503.6 discloses a lane change blind spot warning light, comprising: a housing having an opening and a receiving cavity, the opening being configured to provide a light-emitting surface; a circuit board disposed in the receiving cavity of the housing, and the circuit board including at least one light source, the light-emitting surface of which at least one light source is disposed, such that light is emitted from at least one light source toward the light-emitting surface; and at least one reflector disposed sequentially between the light source and the light-emitting surface, for reflecting stray light in the light to the light-emitting surface. In this design, the light source is oriented toward the light-emitting surface, resulting in poor light uniformity and a tendency to produce glare and dark spots at the edges. Summary of the Invention

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a rearview mirror blind spot warning module and a car rearview mirror with uniform light and reduced glare.

[0006] The purpose of this disclosure is achieved through the following technical solution: A rearview mirror blind spot warning module includes a mirror housing and a warning light assembly; The mirror housing is provided with a light-receiving area; The warning light assembly includes a housing, a shaped circuit board, a light source, a light diffuser, and a light-shielding adhesive layer. The shaped circuit board is mounted on the housing and has a light channel. A diffuse reflection surface is formed on the inner side of the housing. The light source is fixed to the shaped circuit board and faces the diffuse reflection surface. The position of the light channel corresponds to the reflection path of the light on the diffuse reflection surface. The light diffuser is covered on the shaped circuit board. The light-shielding adhesive layer is bonded to the light diffuser and has a light-emitting window. The light-shielding adhesive layer is bonded to the mirror housing. The light-emitting window is correspondingly arranged with the light-collecting area.

[0007] In one embodiment, the area of ​​the light-emitting window is larger than the area of ​​the light-collecting area.

[0008] In one embodiment, the light-shielding adhesive layer has a light-shielding edge portion surrounding the light-emitting window, the width of which is greater than or equal to the width of the edge region of the irregularly shaped circuit board.

[0009] In one embodiment, a first step is provided on the inner edge of the housing, and the irregularly shaped circuit board is installed in the housing and abuts against the first step.

[0010] In one embodiment, a second step is provided on the inner edge of the outer casing, and the light-diffusing sheet is installed inside the outer casing and abuts against the second step, with the second step located above the first step.

[0011] In one embodiment, the irregularly shaped circuit board is a U-shaped structure or a square-shaped structure.

[0012] In one embodiment, the diffuse reflective surface is formed with optical microstructures for scattering light.

[0013] In one embodiment, the incident surface of the light diffuser is formed with an optical pattern for uniformly diffusing light.

[0014] In one embodiment, the rearview mirror blind spot warning module further includes a circuit connector. The housing has a connection hole, and the circuit connector passes through the connection hole and is connected to the irregular circuit board.

[0015] A car rearview mirror, characterized in that it includes the blind spot warning module described in any of the above embodiments.

[0016] Compared with the prior art, this disclosure has at least the following advantages: The aforementioned rearview mirror blind spot warning module has its light source positioned behind the light-emitting window. The light is reflected by a diffuse reflective surface, undergoing depolarization and disordering treatment to eliminate the inherent pixelation and glare of direct light sources. The diffuse reflective surface of the housing, the irregularly shaped circuit board, and the light-diffusing sheet together form a closed light mixing space. This allows the light emitted from the light source to undergo multiple layers of diffuse reflection and mixing within the mixing space. The light is then routed and output through light channels on the irregularly shaped circuit board, ensuring a highly consistent illuminance distribution for the light entering the light-diffusing sheet. This significantly improves the uniformity of the light emitted from the light source and reduces glare, resulting in a clear and uniformly bright warning pattern in the light-receiving area. The optical barrier of the light-shielding layer physically cuts the light from the light-emitting window, and combined with the irregular contour of the light-receiving area, ensures that the edges of the warning pattern projected in the light-receiving area are clear and sharp, free from stray light interference. This ensures that the warning signal remains clearly identifiable in both strong daylight and low-light conditions at night. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a blind spot warning module for a viewing mirror according to one embodiment; Figure 2 for Figure 1 An exploded view of the blind spot warning module shown. Figure 3 for Figure 1 An exploded view of the warning light assembly of the blind spot warning module shown; Figure 4 for Figure 1 Another exploded view of the warning light assembly of the blind spot warning module shown in the diagram; Figure 5 for Figure 1 The diagram shows a cross-sectional view of the warning light assembly of the blind spot warning module for the sight mirror. Detailed Implementation

[0019] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments: Please see Figures 1 to 3 As shown, this is a rearview mirror blind spot warning module 10 according to an embodiment of the present invention, including a mirror housing 100 and a warning light assembly 200; the mirror housing 100 is provided with a light-collecting area 101, the light-collecting area 101 is a transparent area or opening on the mirror housing 100, and the shape of the light-collecting area 101 is adapted to the required warning pattern.

[0023] Further, the warning light assembly 200 includes a housing 210, a shaped circuit board 220, a light source 230, a light-diffusing sheet 240, and a light-shielding adhesive layer 250. The shaped circuit board 220 is mounted on the housing 210 and has a light channel 2201. A diffuse reflection surface 211 is formed on the inner side of the housing 210. The light source 230 is fixed to the shaped circuit board 220 and faces the diffuse reflection surface 211. The position of the light channel 2201 corresponds to the reflection path of the light by the diffuse reflection surface 211. The light-diffusing sheet 240 covers the shaped circuit board 220. The light-shielding adhesive layer 250 is bonded to the light-diffusing sheet 240 and has a light-emitting window 2501. The light-shielding adhesive layer 250 is bonded to the mirror housing 100. The light-emitting window 2501 is correspondingly arranged with the light-collecting area 101.

[0024] Understandably, when the light emitted by the light source 230 shines on the diffuse reflection surface 211, due to the uneven surface or specific curvature of the diffuse reflection surface 211, the light will be reflected irregularly in various directions. This process destroys the original directionality of the light source 230, allowing the light to be fully mixed in multiple diffuse reflections, thereby eliminating the graininess of the light source 230. After being uniformly mixed by the diffuse reflection surface 211, the light passes through the light channel 2201 opened on the irregular circuit board 220 and shines on the light homogenizer 240. The light homogenizer 240 further homogenizes the light and finally passes through the light exit window 2501 opened on the light shielding layer 250, forming a warning pattern with uniform brightness and clear boundaries in the light-receiving area 101 of the mirror housing 100.

[0025] The aforementioned rearview mirror blind spot warning module 10 has a light source 230 positioned behind the light output window 2501. The light is reflected by the diffuse reflection surface 211, undergoing depolarization and disordering treatment to eliminate the inherent pixelation and glare of the direct light source 230. The diffuse reflection surface 211 of the housing 210, the irregularly shaped circuit board 220, and the light homogenizer 240 together form a closed light mixing space. This allows the light emitted by the light source 230 to undergo multiple layers of diffuse reflection and mixing within the mixing space. The light is then routed and output through the light channel 2201 on the irregularly shaped circuit board 220, ensuring... The light entering the light-diffusing sheet 240 has a highly uniform illuminance distribution. Through constrained secondary light diffusing, the uniformity of the light emitted from the light source 230 is greatly improved and glare is reduced, so that the warning pattern presented in the light-collecting area 101 is uniform and clear without any brightness. Through the optical barrier of the light-shielding adhesive layer 250, the light-emitting window 2501 physically cuts the light. Combined with the irregular contour of the light-collecting area 101, the warning pattern projected by the light-collecting area 101 has clear and sharp edges without stray light interference, so that the warning signal can remain clearly distinguishable in strong daylight or low light conditions at night.

[0026] like Figure 2As shown, in one embodiment, the area of ​​the light-emitting window 2501 is larger than the area of ​​the light-collecting area 101. In this embodiment, if the light-emitting window 2501 is smaller than or equal to the light-collecting area 101, even a slight assembly offset will result in the loss of light at the edge of the light-collecting area. The light-emitting window 2501 and the light-collecting area 101 form a channel that gradually narrows from the inside to the outside in the light transmission path. On the one hand, this plays a role in tolerance matching. Even if there is a slight installation deviation between the warning light assembly 200 and the mirror housing 100 during the assembly process, the larger area of ​​the light-emitting window 2501 can still ensure that the light completely covers the light-collecting area 101, avoiding dark corners or light loss in the light-collecting area 101 due to assembly errors. On the other hand, the light after passing through the light-diffusing plate 240 is converged and guided to a certain extent within the range of the light-emitting window 2501. When the light transitions from a larger internal area to a smaller external area, the luminous flux per unit area increases relatively, which helps to improve the surface brightness of the warning pattern and make the warning signal more penetrating and conspicuous.

[0027] like Figure 4 As shown, in one embodiment, the light-shielding adhesive layer 250 has a light-shielding edge portion 251 surrounding the light-emitting window 250. The width of the light-shielding edge portion 251 is greater than or equal to the width of the edge region of the irregular circuit board 220. In this embodiment, the edge region of the irregular circuit board 220 is often a weak point where light easily escapes. Some scattered light from the light source 230 may escape outward through the side of the circuit board, the gap between components, or the edge of the reflective surface, forming an uncontrollable light path. The light-shielding adhesive layer 250 completely covers the edge region on the horizontal projection surface of the irregular circuit board 220, cutting off the potential stray light escape path and ensuring that light can only be output through the preset light-emitting window 2501, eliminating light leakage caused by the edge. Furthermore, the light-shielding adhesive layer 250 forms a physical cover and seal to protect the edge of the irregular circuit board 220 below, preventing... External environmental factors intrude through the side of the irregularly shaped circuit board 220, thereby improving the long-term working stability of the module; the light is uniformly processed by the light homogenizer 240, and the shielding of stray light at the front end eliminates possible bright spots or shadows on the light homogenizer 240, making the light-emitting surface of the light-emitting window 2501 uniform in brightness. At the end, the light-shielding adhesive layer 250 narrows the channel and enhances the surface brightness of the light-collecting area 101. The synergistic effect of the two makes the warning pattern projected into the light-collecting area through the light-emitting window 250 clear and sharp, providing the driver with clear, bright and stable blind spot warning information.

[0028] like Figure 5As shown, further, the inner portion of the light-shielding adhesive layer 250 covers the light-diffusing sheet 240, and the outer portion of the light-shielding adhesive layer 250 covers the edge of the outer casing 210. In this embodiment, the light-shielding adhesive layer 250 is bonded to the surface of the light-diffusing sheet 240 and extends outwards, so that the inner region of the light-shielding adhesive layer 250 is in close contact with the light-diffusing sheet 240, while the outer region extends beyond the light-diffusing sheet 240 and directly covers and bonds to the edge of the outer casing 210. The light-shielding adhesive layer 250 effectively connects the light-diffusing sheet 240, the outer casing 210, and the subsequently installed mirror housing 100 together. The inner portion of the light-shielding adhesive layer 250 covers the light-diffusing sheet 240, ensuring that only the light emitted from the light-diffusing sheet 240 can pass through the light exit window 2501, avoiding... Light leaks from the side of the light diffuser 240, and the outer part of the light-shielding adhesive layer 250 covers the edge of the outer shell 210, isolating the internal structure of the entire warning light assembly 200 from the external environment, forming a relatively closed cavity. This prevents dust or moisture from entering the internal cavity through the gap between the light diffuser 240 and the outer shell 210, avoiding the attenuation of optical effect due to contamination. Furthermore, the large-area bonding and fixing method enhances the overall structural stability of the warning light assembly 200, making it less likely for the internal components to shift relative to each other, thus ensuring the long-term stability of the optical path and the reliability of the warning effect.

[0029] like Figure 3 As shown, in one embodiment, the inner edge of the housing 210 is provided with a first step 212, and the irregularly shaped circuit board 220 is installed inside the housing 210 and abuts against the first step 212. In this embodiment, the first step 212 is integrally formed into a stepped structure during the injection molding of the housing 210, so that the flatness and height dimensions are strictly controlled, so that when the irregularly shaped circuit board 220 is installed into the housing 210, its edge abuts against the first step 212, thereby achieving precise positioning of the irregularly shaped circuit board 220. This ensures that the light source 230 on the irregularly shaped circuit board 220 is at a predetermined optimal optical distance relative to the diffuse reflection surface 211 and the subsequently installed light-diffusing sheet 240, avoiding assembly errors and offset of the relative position of the light source 230 and the diffuse reflection surface 211. Furthermore, the first step 212 reserves precise height space for the subsequent installation of the light-diffusing sheet 240.

[0030] like Figure 3As shown, in one embodiment, the inner edge of the housing 210 is further provided with a second step 213. The light-diffusing sheet 240 is installed inside the housing 210 and abuts against the second step 213, which is located above the first step 212. In this embodiment, the inner edge of the housing 210 is integrally formed with two stepped structures of different heights during injection molding. The first step 212 is located below for positioning the irregular circuit board 220, and the second step 213 is located above for positioning the light-diffusing sheet 240. The two steps support two key optical components respectively, so that the irregular circuit board 220 and the light-diffusing sheet 240 are both suspended in the housing 210, reducing the contact area with the bottom of the housing 210, avoiding deformation that may be caused by uneven bottom, and increasing the reflection space of light in the cavity, further improving the light efficiency.

[0031] like Figure 2 and Figure 5 As shown, further, in one embodiment, the height difference between the first step 212 and the second step 213 is greater than the thickness of the irregular circuit board 220, so that a gap is formed between the light-diffusing sheet 240 and the irregular circuit board 220. In this embodiment, when the irregular circuit board 220 is installed in place and abuts against the first step 212, its top surface will not contact the light-diffusing sheet 240 above it, and a reserved gap is maintained between the irregular circuit board 220 and the light-diffusing sheet 240. The irregular circuit board 220 is soldered with electronic components or has a certain height tolerance to avoid physical interference between the light-diffusing sheet 240 and the electronic components. The light-diffusing sheet 240 and the irregular circuit board 220 are installed independently and do not generate assembly stress between them, ensuring that both optical elements can maintain a stable position and shape under long-term vehicle vibration environment, thereby improving the long-term reliability of the warning module. The gap forms an air insulation layer, which helps the heat generated by the light source 230 to dissipate through convection, reducing the risk of heat being directly conducted to the light-diffusing sheet 240, causing it to age or deform.

[0032] As further shown in the figure, in one embodiment, a spacer block 241 is provided on the side of the light-diffusing sheet 240 adjacent to the irregular circuit board 220, and the spacer block 241 abuts against the irregular circuit board 220. In this embodiment, the fixing block is a protruding structure integrally formed or fixedly connected to the light-diffusing sheet 240. After the light-diffusing sheet 240 is installed in place and abuts against the second step 213, the spacer block 241 extends downward and contacts the surface of the irregular circuit board 220 below. The spacer block 241 provides multi-point support for the light-diffusing sheet 240, improving the overall shock resistance and morphological stability of the light-diffusing sheet 240. The gap between the light-diffusing sheet 240 and the irregular circuit board 220 remains uniform throughout the entire area, avoiding local gap changes caused by the drooping or warping of the light-diffusing sheet 240. This ensures the consistency of the incident angle of light across the entire surface of the light-diffusing sheet 240, further improving the uniformity of light output. The spacer block 241 has the function of precisely positioning the gap. Through direct contact with the irregular circuit board 220, the minimum distance between the light-diffusing sheet 240 and the circuit board is precisely locked, avoiding gap changes that may be caused by manufacturing tolerances or assembly errors. This ensures that the mixing distance of each rearview mirror blind spot warning module 10 is strictly consistent. Further, in one embodiment, the first step 212 has an embedded groove 2101, the light-diffusing sheet 240 abuts against the first step 212, and an embedded protrusion 242 is formed on the side of the light-diffusing sheet 240 adjacent to the first step 212. The embedded protrusion 242 is adapted to be installed in the embedded groove 2101. In this embodiment, the cooperation between the embedded protrusion 242 and the embedded groove 2101 achieves precise positioning of the light-diffusing sheet 240 in the horizontal direction, ensuring the consistency of the spacing between the light-diffusing sheet 240 and the lower irregular circuit board 220 and the light source 230, thereby ensuring the stability and repeatability of the optical effect. Further, there is a receiving gap between the embedded protrusion 242 and the embedded groove 2101. The receiving gap is filled with sealant, and after the sealant cures, a continuous and dense annular sealing barrier is formed, preventing the intrusion of dust and moisture. The elastomeric layer formed after the sealant cures is between Between the edge of the light-diffusing sheet 240 and the first step 212, the elastomeric layer absorbs the relative micro-movements between the light-diffusing sheet 240 and the outer shell 210, avoiding stress concentration caused by hard contact; the sealant firmly bonds the edge of the light-diffusing sheet 240 to the first step 212, forming a double fixation with the light-shielding adhesive layer 250, so that when the light-diffusing sheet 240 is subjected to long-term vibration, the edge of the light-diffusing sheet 240 is supported by the second step 213 and the middle of the light-diffusing sheet 240 is supported by the spacer block 241, and the lateral direction of the light-diffusing sheet 240 is effectively constrained by the sealant, achieving all-round positioning stability.

[0033] In one embodiment, the irregularly shaped circuit board 220 is a U-shaped structure or a square-shaped structure. In this embodiment, the U-shaped irregularly shaped circuit board 220 is horseshoe-shaped or open frame-shaped, and the square-shaped irregularly shaped circuit board 220 is square-shaped or hollow square frame-shaped; the central area of ​​the irregularly shaped circuit board 220 is hollowed out to form a light channel 2201, so that the center of the irregularly shaped circuit board 220 forms an unobstructed light channel, allowing the light, after being uniformly mixed by the diffuse reflection surface 211, to pass through the irregularly shaped circuit board 220 without obstruction and illuminate the light-diffusing sheet 240, avoiding the central dark area or shadow that may be caused by the circuit board blocking, thereby ensuring the integrity and uniformity of the warning pattern; U-shaped or The U-shaped structure increases the edge length of the circuit board, expanding the contact area between the irregularly shaped circuit board 220 and the air, allowing the heat generated by the light source 230 to dissipate to the surrounding environment more quickly. At the same time, the hollowed-out light channel 2201 promotes air convection and avoids excessive heat accumulation in local areas. The U-shaped or U-shaped irregularly shaped circuit board 220 allows the surrounding area of ​​the irregularly shaped circuit board 220 to be used to arrange the light source 230, drive circuit and connectors, thereby enabling the rearview mirror blind spot warning module 10 to achieve a reasonable layout of electrical components and optical paths within a limited installation space.

[0034] Furthermore, in one embodiment, the number of light sources 230 is at least two, and the two light sources 230 are symmetrically arranged on both sides of the light channel 2201. In this embodiment, the cross-illumination formed by the symmetrically arranged light sources 230 on the diffuse reflection surface 211 makes the brightness distribution of the light illuminating the light uniform plate 240 after reflection more uniform, so that the presented warning pattern has no obvious bright and dark partitions or light spots; the light emitted by the multiple symmetrically arranged light sources 230 begins to interweave with each other in the cavity early, constructing a multi-directional and multi-angle light network in a limited space, so that the light can achieve the ideal mixing effect in a shorter distance; when one light source 230 fails due to the expiration of its lifespan or accidental damage, the other light source 230 symmetrically arranged with it can still maintain the basic illumination function, and can still maintain the basic warning function even if a single light source 230 fails, thus improving driving safety.

[0035] In one embodiment, the diffuse reflective surface 211 is formed with optical microstructures for scattering light. In this embodiment, the micro-geomorphic shapes formed on the diffuse reflective surface 211 inside the housing 210 by means of molding, laser engraving, chemical etching, or precision machining are typically on the scale of micrometers to sub-millimeters. The optical microstructures disperse the specularly reflected light in more directions by changing the direction of the local curved surface normal at the light incident point. By selecting and combining different optical microstructures, the spatial distribution of light in the cavity can be precisely controlled, so that the position and shape of the diffuse reflective surface 211 match the light uniform plate 240.

[0036] Specifically, the optical microstructure of the diffuse reflective surface 211 is a pattern such as stripes, grids, rhombuses, and circles; the height of the pattern is 0.3mm-1mm. Understandably, the striped microstructure has a directional light-guiding effect, allowing light to achieve better diffusion along the direction perpendicular to the stripes; the grid pattern and diamond pattern have isotropic diffusion characteristics, enabling light to be scattered uniformly in all directions; the circular pattern is similar to a microlens array, with a certain function of focusing or diffusing light, and by selecting different patterns, the initial control of the light distribution pattern can be achieved; the outer shell 210 is made of a high diffuse reflectance opaque material, so that the diffuse reflective surface 211 reflects the light that hits its surface back into the cavity, reducing the absorption loss of light by the material itself, while ensuring that light cannot penetrate the wall thickness of the outer shell 210 and leak to the outside, thus avoiding light energy loss and preventing unexpected side light leakage; the pattern height of the optical microstructure is 0.3mm-1mm, which achieves a balance between the feasibility of the optical microstructure and the optical effect, so that the optical microstructure effectively destroys specular reflection, and is also easy to mold processing and injection molding.

[0037] In one embodiment, the light-incident surface of the light-diffusing sheet 240 is formed with an optical pattern for uniformly diffusing light. It is understood that the light-incident surface of the light-diffusing sheet 240 is the side facing the irregular circuit board 220 and the light source 230, receiving light reflected from the diffuse reflection surface 211. The light, after initial mixing by the diffuse reflection surface 211, still exhibits slight angular concentration or localized non-uniformity. Before entering the material body of the light-diffusing sheet 240, it undergoes refraction and scattering processing by the microstructure of the optical pattern, further dispersing the residual non-uniformity of the light. This makes the spatial distribution of the light after entering the body of the light-diffusing sheet 240 closer to an ideal uniform state. That is, the diffuse reflection surface 211 achieves initial homogenization of the light within the cavity, eliminating the directionality and point-like characteristics of the light source 230. The pattern on the light-incident surface of the light-diffusing sheet 240 performs secondary homogenization at the critical point where the light enters the light-guiding medium, further fine-tuning the light distribution. Finally, the material body of the light-diffusing sheet 240 completes final homogenization through internal scattering or volume diffusion, resulting in a softer and more uniform warning pattern light.

[0038] In one embodiment, the sidewall of the housing 210 is formed with a slope 215, which is used to reflect light onto the diffuse reflective surface 211. Understandably, not all the light emitted by the light source 230 directly illuminates the diffuse reflection surface 211. Some of the scattered light does not reach the side wall of the cavity of the outer shell 210. When the side wall of the outer shell 210 is a vertical surface or a light-absorbing surface, some of the scattered light is absorbed and lost or reflected at different angles, resulting in some light not being able to effectively participate in light mixing. The side wall of the outer shell 210 forms a slope 215, and the light from the side wall is reflected back to the inner wall of the cavity and guided to the direction of the diffuse reflection surface 211, so that some of the scattered light forms an effective secondary light source 230. Understandably, the light is stronger in the area close to the light source 230 and relatively weaker in the area far from the light source 230. By adjusting the tilt angle of the slope 215 of the side wall, the light reflected from the side wall is directed to the area of ​​the far light source 230, thereby balancing the illuminance distribution of the entire diffuse reflection surface 211, effectively improving the uniformity of the entire light-emitting surface, eliminating dark areas at the edges, making the overall brightness of the warning pattern more consistent, and enhancing the light mixing capability of the inner cavity of the outer shell 210.

[0039] Furthermore, in one embodiment, a first light-shielding area 2511 is formed on one side edge of the light-shielding edge portion 251, and a second light-shielding area 2512 is formed on the other side edge of the light-shielding edge portion 251. The width of the second light-shielding area 2512 is greater than the width of the first light-shielding area 2511. It is understood that the interior of the rearview mirror housing is usually not a regular rectangular space, but an irregularly shaped space designed according to the vehicle's shape and the mirror's curvature. The gaps between its edges in different directions and the warning light assembly 200 are inconsistent. The light-shielding edge portion 251 introduces an asymmetrical light-shielding design, adapting to actual installation space or optical requirements by changing the light-shielding width of different areas. The light-shielding edge portion 251 has an overall annular or frame-shaped structure, distributed around the light-emitting window 2501. The first light-shielding area 2511 is located on one side edge of the light-shielding edge portion 251, and the second light-shielding area 2512 is located on the other side edge of the light-shielding edge portion 251. The opposite edge of the second light-shielding area 2512 on the opposite side causes the light-emitting window 2501 to be positioned on the light-shielding adhesive layer 250 and biased towards the first light-shielding area 2511. The wider side of the second light-shielding area 2512 provides a larger bonding area and light-shielding margin to accommodate larger installation gaps or block more stray light. The narrower side of the first light-shielding area 2511 saves space and avoids interference with other internal structures. Furthermore, the first light-shielding area 2511 and the second light-shielding area 2512 have different widths, and the light-shielding edge 251 has an asymmetrical structure, which plays a role in preventing mistakes, simplifies the assembly operation, and avoids problems such as reverse installation or misalignment.

[0040] Furthermore, in one embodiment, the diffuse reflective surface 211 has an arcuate structure, and the curvature of the diffuse reflective surface 211 increases along the direction from the first light-shielding area 2511 to the second light-shielding area 2512. In this embodiment, based on the asymmetry of the light-shielding adhesive layer 250, the geometry of the diffuse reflective surface 211 is synergistically optimized. By changing the curvature, the supplementary lighting needs of different areas are matched, constructing an integrated system in which optical and light-shielding characteristics are mutually matched. The arcuate structure of the diffuse reflective surface 211 with gradually changing curvature along a specific direction, the degree of curvature of the diffuse reflective surface 211 gradually increases along one side of the first light-shielding area 2511 to the second light-shielding area 2512. The second light-shielding area 2512 is wider and has more light-shielding material coverage, causing the second light-shielding area 2512 to block or absorb some light. Moreover, one side of the second light-shielding area 2512 is farther from the edge of the light-exit window 2501. The increase in curvature of the diffuse reflective surface 211 increases the curvature of the light-shielding surface. The region with a more concentrated angle of light reflection compensates for the decrease in light efficiency caused by the wider shading area. The region with a larger curvature has a stronger light-gathering effect, gathering more light scattered to the sidewall and guiding it out of the light window 2501, further improving the utilization of light efficiency. The region with a smaller curvature has relatively diffused light, which, in conjunction with the narrower first shading area 2511, ensures sufficient light to pass through while avoiding local bright spots caused by excessive convergence. The coordinated design of the diffuse reflection surface 211 and the light-shielding adhesive layer 250 achieves fine control of the optical system, so that the limited energy of the light source 230 is reasonably distributed in different directions, improving the overall light efficiency, and making the curved surface structure with varying curvature form a good spatial fit with components such as the irregular circuit board 220 and the light-diffusing sheet 240.

[0041] In one embodiment, the outer casing 210 forms a limiting protrusion 214, and the irregularly shaped circuit board 220 has a limiting hole 2202, with the limiting protrusion 214 passing through the limiting hole 2202. In this embodiment, the outer casing 210 integrally forms a columnar or irregularly shaped limiting protrusion 214 during injection molding. After the irregularly shaped circuit board 220 is installed into the outer casing 210 and abuts against the first step 212, the limiting protrusion 214 passes through the limiting hole 2202, restricting the translational and rotational freedom of the irregularly shaped circuit board 220 in the horizontal direction, preventing the irregularly shaped circuit board 220 from shifting during use, and keeping the angle and position of the light source 230 relative to the diffuse reflection surface 211 fixed. During assembly, the limiting protrusion 214 passes through the limiting hole 2202 for guidance and correction, achieving precise alignment and improving production efficiency.

[0042] In one embodiment, the rearview mirror blind spot warning module 10 further includes a circuit connector 300. The housing 210 has a connection hole 2102, through which the circuit connector 300 passes and connects to the irregular circuit board 220. In this embodiment, the circuit connector 300 refers to an electrical component used to connect the warning light module to the vehicle's main circuit. The circuit connector 300 connects wires, connector terminals, or ribbon cables, etc. The connection hole 2102 provides a standardized physical interface for circuit connection, enabling the warning light module to easily achieve electrical connection with the vehicle's main circuit, simplifying the vehicle assembly process. The position and direction of the connection hole 2102 are set according to wiring requirements to adapt the warning light module to the installation space and wiring routing of different vehicle models, thereby enhancing the adaptability of the warning light module. This application also provides a car rearview mirror, including the rearview mirror blind spot warning module 10 described in any of the above embodiments. In this embodiment, the rearview mirror blind spot warning module 10 is integrated into the car rearview mirror, adding blind spot monitoring and warning functions, and realizing functional integration and space sharing; the rearview mirror blind spot warning module 10 effectively controls its overall thickness and volume through a compact structural design, thereby flexibly embedding it into the remaining space inside the rearview mirror; the rearview mirror blind spot warning module 10, through the combined action of the diffuse reflection surface 211, the irregularly shaped circuit board 220, the light-diffusing sheet 240 and the light-shielding adhesive layer 250, makes the warning pattern in the light-receiving area 101 clearly visible under strong daylight, and avoids excessive brightness at night causing glare that interferes with driving.

[0043] Compared with the prior art, this disclosure has at least the following advantages: The aforementioned rearview mirror blind spot warning module 10 has a light source 230 positioned behind the light output window 2501. The light is reflected by the diffuse reflection surface 211, undergoing depolarization and disordering treatment to eliminate the inherent pixelation and glare of the direct light source 230. The diffuse reflection surface 211 of the housing 210, the irregularly shaped circuit board 220, and the light homogenizer 240 together form a closed light mixing space. This allows the light emitted by the light source 230 to undergo multiple layers of diffuse reflection and mixing within the mixing space. The light is then routed and output through the light channel 2201 on the irregularly shaped circuit board 220, ensuring... The light entering the light-diffusing sheet 240 has a highly uniform illuminance distribution. Through constrained secondary light diffusing, the uniformity of the light emitted from the light source 230 is greatly improved and glare is reduced, so that the warning pattern presented in the light-collecting area 101 is uniform and clear without any brightness. Through the optical barrier of the light-shielding adhesive layer 250, the light-emitting window 2501 physically cuts the light. Combined with the irregular contour of the light-collecting area 101, the warning pattern projected by the light-collecting area 101 has clear and sharp edges without stray light interference, so that the warning signal can remain clearly distinguishable in strong daylight or low light conditions at night.

[0044] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A rearview mirror blind spot warning module, characterized in that, Including the mirror housing and warning light assembly; The mirror housing is provided with a light-collecting area; The warning light assembly includes a housing, a shaped circuit board, a light source, a light diffuser, and a light-shielding adhesive layer. The shaped circuit board is mounted on the housing and has a light channel. A diffuse reflection surface is formed on the inner side of the housing. The light source is fixed to the shaped circuit board and faces the diffuse reflection surface. The position of the light channel corresponds to the reflection path of the light on the diffuse reflection surface. The light diffuser is covered on the shaped circuit board. The light-shielding adhesive layer is bonded to the light diffuser and has a light-emitting window. The light-shielding adhesive layer is bonded to the mirror housing. The light-emitting window is correspondingly arranged with the light-collecting area.

2. The rearview mirror blind spot warning module according to claim 1, characterized in that, The area of ​​the light-emitting window is larger than the area of ​​the light-collecting area.

3. The rearview mirror blind spot warning module according to claim 1, characterized in that, The light-shielding adhesive layer has a light-shielding edge portion surrounding the light-emitting window, and the width of the light-shielding edge portion is greater than or equal to the width of the edge region of the irregularly shaped circuit board.

4. The rearview mirror blind spot warning module according to claim 1, characterized in that, The inner edge of the outer casing is provided with a first step, and the irregularly shaped circuit board is installed inside the outer casing and abuts against the first step.

5. The rearview mirror blind spot warning module according to claim 4, characterized in that, The inner edge of the outer casing is further provided with a second step, and the light-diffusing sheet is installed inside the outer casing and abuts against the second step, with the second step located above the first step.

6. The rearview mirror blind spot warning module according to claim 1, characterized in that, The irregularly shaped circuit board has a U-shaped or square-shaped structure.

7. The rearview mirror blind spot warning module according to claim 1, characterized in that, The diffuse reflective surface is formed with optical microstructures for scattering light.

8. The rearview mirror blind spot warning module according to claim 1, characterized in that, The light-incident surface of the light-diffusing plate is formed with optical patterns for uniformly diffusing light.

9. The rearview mirror blind spot warning module according to claim 1, characterized in that, The rearview mirror blind spot warning module also includes a circuit connector. The housing has a connection hole, and the circuit connector passes through the connection hole and is connected to the irregular circuit board.

10. A car rearview mirror, characterized in that, Includes the rearview mirror blind spot warning module as described in any one of claims 1-9.

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