A light shielding assembly, a detection device and a terminal

Abstract

The application discloses a light shielding assembly (100), a detection device and a terminal, and belongs to the technical field of optical devices and detection technology. The light shielding assembly (100) comprises a first light shielding plate (10), the first light shielding plate (10) is provided with protruding barrier columns (102) and a plurality of protruding sawteeth (101), and the vertical height of the barrier columns (102) is higher than that of the plurality of sawteeth (101). By arranging the sawteeth (101) and the barrier columns (102), the interference of stray light on detection can be reduced. When the light shielding assembly (100) is arranged outside a view window of the detection device, the interference of stray light formed by external elements on detection can be reduced, the possibility that the detection device erroneously detects a return signal can be significantly reduced, the ranging precision is improved, and the detection performance is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical devices and detection technology, and in particular to a light shielding assembly, a detection device and a terminal. BACKGROUND

[0002] With the development of information technology and computer vision, detection technology has developed rapidly, and various detection devices have brought great convenience to people's life and travel. Detection devices can be regarded as the "eyes" of the environment, including visual system sensors such as cameras and radar system sensors such as millimeter wave radars, laser radars and ultrasonic radars. Among them, the laser radar (light detection and ranging, Lidar) technology has obvious advantages in detection range, ranging accuracy and reliability, and has the characteristics of nearly all-weather working, and is a key sensor in the perception field, playing an important role in intelligent driving, intelligent transportation, surveying and mapping, intelligent manufacturing and other fields. The principle of laser radar detection is to emit a detection signal light and receive a return signal from the target in the field of view, thereby obtaining the relevant information of the target.

[0003] In the installation position of the radar, the mainstream laser radar is usually installed outside the device, such as installed outside the vehicle body, the body of a logistics robot, etc., so that it is not affected by the reflection of the windshield glass and has better optical performance. On the one hand, the laser radar installed outside the device will have the problem of accelerated aging, affecting the service life, and on the other hand, it will also affect the wind resistance and aesthetics of the vehicle.

[0004] If the laser radar is built-in inside the windshield, the aging speed of the laser radar can be greatly slowed down. However, the windshield area is relatively large and usually cannot be implemented by precise optical devices, and the surface of the windshield exposed to the environment often has minor wear and deposits some dust. These factors cause the windshield to have its own characteristics of low transmission, high reflection and high scattering, which will reflect the detection signal light emitted by the laser radar, introduce more stray light, and interfere with the radar, affecting the ranging accuracy of the radar. SUMMARY

[0005] The embodiments of the present application provide a light shielding assembly, a detection device and a terminal, which can reduce the interference of stray light on detection, improve the ranging accuracy of the detection device, and improve the detection performance.

[0006] In a first aspect, the embodiments of the present application provide a light shielding assembly, comprising:

[0007] A first light shielding plate, wherein the first light shielding plate is provided with a protruding obstacle column and a plurality of protruding sawteeth, and the vertical height of the obstacle column is higher than that of the plurality of sawteeth.

[0008] In the embodiments of the present application, on the one hand, when the stray light reaches the plurality of sawtooth portions of the first light shield, the stray light can be absorbed or dispersed by the sawtooth portions. Even if the stray light is not absorbed when it reaches the sawtooth for the first time, there is a high probability that the stray light will be reflected again to another sawtooth between the sawtooths, thereby gradually weakening the energy intensity of the stray light. Therefore, the plurality of sawtooth portions provided on the light shield can significantly reduce the interference of the stray light on the detection.

[0009] On the other hand, the barrier column higher than the sawtooth can block the stray light (for example, the stray light propagating on the surface of the first light shield) that is not consumed by the sawtooth, further reducing the interference of the stray light on the detection.

[0010] Optionally, the light shielding assembly can be arranged outside the viewing window of the detection device. Since the detection device detects the echo signal to measure the distance, reducing the interference of the stray light formed by the external elements on the detection can significantly reduce the possibility of false detection of the echo signal by the detection device, thereby improving the accuracy of the distance measurement and improving the detection performance.

[0011] In addition, by the above-mentioned manner, the ability of the detection device to resist the interference of the stray light is improved, so that the detection device can be arranged inside the external elements (for example, inside the vehicle cabin, inside the robot, etc.), so that it can be free from the influence of external high temperature, rain and weathering. Not only the service life of the laser radar is improved, but also the installation position of the laser radar has higher flexibility, and the user experience is improved.

[0012] In still another possible implementation form of the first aspect, a surface of the barrier column is of a low reflectivity material.

[0013] The low reflectivity material has a weak reflection effect on light, so that when the stray light reaches the light shield, the possibility of reflection of the stray light can be reduced by the low reflectivity material, and the interference of the stray light on the detection is reduced.

[0014] For example, the surface of the barrier column is of a first material, and the reflectivity of the first material is lower than a first threshold. For example, the first threshold is 40%, or 30%, or 20%, or 10%, or 5%, or 2%, or 1%.

[0015] Optionally, the reflectivity here can be the reflectivity at a certain preset temperature (usually at room temperature, for example, about 25 degrees Celsius, or at standard conditions, 0 degrees Celsius).

[0016] In a further possible implementation form of the first aspect, the surfaces of the plurality of sawteeth are of a low reflectivity material. For example, the surfaces of the plurality of sawteeth are of a second material having a reflectivity lower than a second threshold. For example, the second threshold is 40%, or 30%, or 20%, or 10%, or 5%, or 2%, or 1%.

[0017] In a possible implementation form of the first aspect, the surfaces of the first light barrier (e.g. the surfaces on which the barrier columns and the sawteeth are arranged) are of a low reflectivity material.

[0018] Optionally, the surfaces of the first light barrier are of a third material having a reflectivity lower than a third threshold. For example, the first threshold is 40%, or 30%, or 20%, or 10%, or 5%, or 2%, or 1%.

[0019] Optionally, the first, second and third materials can be the same material, or different materials. The first, second and third thresholds can be the same, or different.

[0020] In a further possible implementation form of the first aspect, each sawteeth of the plurality of sawteeth is inclined towards the barrier column.

[0021] In this implementation form, when the plurality of sawteeth is inclined, the sawteeth tips are more "sharp", reducing the energy of the stray light.

[0022] When the sawteeth are inclined towards the barrier column, the stray light is more likely to be incident on the side of the sawteeth that is further away from the barrier column, and even if not absorbed and / or consumed, can be reflected towards the side further away from the barrier column.

[0023] In this case, arranging the barrier column between the sawteeth and the window of the detection device allows the sawteeth and the barrier column to consume stray light that can enter the window of the detection device, reducing the likelihood of stray light entering the detection device, and thus reducing the interference caused by stray light.

[0024] In a further possible implementation form of the first aspect, the light barrier assembly is arranged outside the window of the detection device; and the barrier column is arranged between the window and the plurality of sawteeth.

[0025] In the above implementation form, arranging the light barrier assembly outside the window of the detection device reduces the interference of stray light from external elements on the detection, and can significantly reduce the likelihood of false detection of echo signals by the detection device, thus improving the accuracy of the ranging and the detection performance.

[0026] The barrier pillars, positioned between the viewing window and multiple sawtooths, can block stray light propagating towards the viewing window (by absorbing or reflecting it away from the viewing window), thereby further reducing stray light entering the viewing window and minimizing interference.

[0027] In addition, residual light from the detection signal light coming from the window that exceeds the edge of the field of view may also interfere with the detection device. The obstruction pillar can also block stray light from the direction of the window, further reducing interference.

[0028] In yet another possible implementation of the first aspect, the light-shielding component is located between the window and the first transparent surface, and each of the plurality of serrations includes a first side and a second side, the first side being close to the window and the second side being away from the window;

[0029] The angle between the second side and the horizontal direction is related to the angle between the first transparent surface and the horizontal direction and the field of view of the detection device in the vertical direction.

[0030] The first transparent surface can be the surface of the transparent outer shell of the device housing the detection device. For example, if the detection device is located inside the cockpit, the first transparent surface is the surface of the windshield. Or, if the detection device is located inside the chest cavity of a robot, the first transparent surface is the surface of the transparent outer shell on the robot's chest.

[0031] In the above embodiment, when the tilt angle of the second side of the sawtooth is nearly parallel to the stray light reflected from the transparent surface to the sawtooth, the stray light can be more accurately propagated between the two sawtooths, thereby improving the effect of the sawtooth in consuming signal light and improving the light-blocking efficiency.

[0032] Optionally, the angle γ between the second side and the horizontal direction satisfies the following formula:

[0033] Where x is close to 0. Here, γ is the angle between the second side and the horizontal direction, α is the field of view of the detection device, is the angle between the first transparent surface and the horizontal direction, and x is the angle between γ and α. The absolute value of the difference between them.

[0034] For example, x = 5°, or x = 1°.

[0035] In yet another possible implementation of the first aspect, the angle between the second side and the horizontal direction satisfies the following equation:

[0036]

[0037] Wherein, γ is the angle between the second side and the horizontal direction, α is the field of view angle of the detection device, and β is the angle between the first transparent surface and the horizontal direction.

[0038] In this implementation, when the detection signal light near the lower edge of the field of view (FOV) in the vertical direction is incident on the first transparent surface, the incident angle is larger, resulting in stronger stray light. By setting the angle between the second side and the horizontal direction to be parallel to the direction of the signal light reflected after the detection signal light is incident on the transparent surface at the lower edge of the FOV, the possibility of stray light formed by the large-angle incident on the transparent surface entering the detection device can be significantly reduced, thus improving the light-blocking efficiency.

[0039] In another possible implementation of the first aspect, the angle between the first light-shielding plate and the horizontal direction is half of the field of view of the detection device in the vertical direction.

[0040] In the above embodiment, tilting the first light-shielding plate allows it to be positioned closer to the edge of the detection signal light emitted by the detection device without blocking the normal detection signal light. This maximizes space utilization and allows the light-shielding plate to surround the field of view, improving light-shielding efficiency.

[0041] Optionally, the barrier pillars and multiple sawtooths are disposed on the first surface of the first light-shielding plate. The angle between the first surface of the first light-shielding plate and the horizontal direction can be used as the angle between the first light-shielding plate and the horizontal direction.

[0042] In another possible implementation of the first aspect, the first light-shielding plate is further provided with a first cavity, the opening of the first cavity being located on the side of the barrier post away from the plurality of saw teeth.

[0043] In this implementation, the cavity can absorb stray light entering the cavity. This absorption can occur through surface reception of the cavity or through multiple reflections between the inner walls of the cavity, gradually reducing the energy intensity of the stray light. That is, most of the stray light is absorbed by the inner walls of the cavity; even if the stray light is reflected by the inner walls of the cavity, the reflected light has a high probability of being transmitted to other inner walls of the cavity, thus being absorbed multiple times and reducing the energy intensity of the stray light.

[0044] Consider a possible scenario: when the detection device is placed inside the equipment, the light signal at the edge of the field of view may illuminate the inside of the equipment or the external components of the equipment, forming more stray light; in addition, there is usually residual light at the edge of the field of view of the detection device that exceeds the preset field of view, and this residual light may also cause stray light.

[0045] Optionally, stray light entering the cavity may be reflected by the barrier pillar. In this embodiment, the first cavity is provided on the side of the barrier pillar away from the plurality of sawtooths, which can block the detection signal light transmitted close to the light shield, reduce stray light caused by invalid detection signal light, and thus reduce detection interference.

[0046] In another possible implementation of the first aspect, the length of the opening of the first cavity is less than the length of the bottom wall of the first cavity.

[0047] That is, the first cavity is a "narrow-mouthed" cavity. Due to the small opening, light is difficult to escape from the opening after entering the first cavity, thereby further reducing the possibility of stray light entering the detection device and improving the light-blocking efficiency.

[0048] Optionally, the length of the opening of the first cavity is the length of the opening of the first cavity along the direction from the barrier post to the multiple saw teeth. Similarly, the length of the bottom wall is the length of the opening of the first cavity along the direction from the barrier post to the multiple saw teeth.

[0049] In another possible implementation of the first aspect, the first light-shielding plate is further provided with a second cavity, the opening of the second cavity being disposed between the barrier post and the plurality of saw teeth.

[0050] In this implementation, the stray light entering the cavity can be consumed by the second cavity, thereby reducing the energy intensity of the stray light.

[0051] In another possible implementation of the first aspect, the length of the opening of the second cavity is less than the length of the bottom wall of the second cavity. That is, the second cavity is a "narrow-mouthed" cavity.

[0052] Because the opening is small, stray light is difficult to reflect out of the opening after entering the first cavity, thus further reducing the possibility of stray light entering the detection device and improving the light-blocking efficiency.

[0053] Optionally, the length of the opening of the second cavity is the length of the opening of the second cavity along the direction from the barrier post to the multiple saw teeth. Similarly, the length of the bottom wall is the length of the opening of the second cavity along the direction from the barrier post to the multiple saw teeth.

[0054] Optionally, stray light entering the second cavity may be reflected by a barrier column.

[0055] In another possible implementation of the first aspect, the first light-shielding plate is a tiered structure, and the barrier column is located at the waist of the first light-shielding plate.

[0056] Understandably, the angle of incidence and reflectivity are positively correlated (i.e., the smaller the angle of incidence, the smaller the reflectivity). When the angle of incidence of the probe signal light on the first transparent surface is larger, the reflectivity of the first transparent surface to the probe signal light is higher, and the stray light generated also increases accordingly. Since the probe signal light emitted by the detection device has a larger angle of incidence when it hits the first transparent surface at the edge of the field of view, the stray light is mainly distributed on both sides (i.e., the waist) of the first light-shielding plate.

[0057] In the above embodiments, by setting the barrier pillar at the waist of the trapezoidal structure (or inverted V-shape), stray light generated at the edge of the field of view and incident on the first transparent surface can be effectively suppressed, thereby improving the light-blocking efficiency.

[0058] Optionally, the top surface may not have obstruction pillars. In some scenarios, the top surface falls within a small field of view, and the energy of stray light is relatively weak. Therefore, obstruction pillars may not be installed on the top surface to avoid affecting the emission field of view of the detection device.

[0059] In another possible implementation of the first aspect, the first light-shielding plate is axially symmetrical about the center line of the first light-shielding plate.

[0060] In this implementation, the relatively symmetrical design ensures a more even shading effect on both sides of the field of view, avoiding discrepancies in detection accuracy between the left and right sides, thus improving service quality and user experience. It should be understood that in actual implementation, the two sides of the first light-shielding plate may not be absolutely symmetrical; this is to indicate that both sides of the first light-shielding plate have similar structures, such as obstruction pillars, cavities, or serrated light-shielding structures.

[0061] In another possible implementation of the first aspect, the first cavity is disposed at the waist of the first light-shielding plate. Disposing the first cavity at the waist can suppress stray light entering at the edge of the field of view, thereby improving light-shielding efficiency.

[0062] In another possible implementation of the first aspect, the second cavity is disposed at the waist of the first light-shielding plate. Disposing the second cavity at the waist can suppress stray light entering at the edge of the field of view, thereby improving light-shielding efficiency.

[0063] In another possible implementation of the first aspect, the plurality of serrations are disposed at the waist of the first light-shielding plate. Distributing the plurality of serrations at the waist can suppress stray light entering at the edge of the field of view, thereby improving light-shielding efficiency.

[0064] In another possible implementation of the first aspect, the plurality of serrations are realized by a columnar body with a triangular cross-section, the serrations extending from the waist of one side of the first light shield to the waist of the other side of the first light shield.

[0065] That is, the plurality of serrations are disposed on the waist of the first light-shielding plate and on the upper bottom surface of the first light-shielding plate.

[0066] In this implementation, the multiple sawtooths are designed to extend from one side of the waist to the top surface and then to the other side of the waist, avoiding the introduction of new reflective surfaces near the top surface and reducing the probability of stray light generation. The multiple sawtooths are arranged along the first light-shielding plate of the trapezoidal structure, forming an inverted V-shape on both sides and distributed along the top surface in the middle. This allows stray light incident on the sawtooths to be reflected towards the sidewall of another sawtooth, minimizing the reflection of stray light back to the detection device and reducing the energy of the stray light.

[0067] In yet another possible implementation of the first aspect, the barrier post is tilted toward a side away from the plurality of serrations.

[0068] Tilt the barrier post away from the multiple saw teeth so that it can reflect stray light to the side away from the detection device, further reducing the possibility of stray light entering the detection device and thus reducing the interference caused by stray light.

[0069] With the first cavity set on the first light-shielding plate, the obstruction column is tilted to one side of the first cavity, which can increase the possibility of stray light from one side of the first cavity being reflected back to the first cavity by the obstruction column, further reducing the interference caused by stray light and improving the light-shielding efficiency.

[0070] In yet another possible implementation of the first aspect, the angle between the barrier post and the surface of the first light-shielding plate falls within [35°, 45°].

[0071] The surface of the first light-shielding plate can be one of the multiple surfaces of the first light-shielding plate, on which the first obstacle column is set.

[0072] In another possible implementation of the first aspect, the barrier post includes a first branch and a second branch, the first branch being inclined toward a side away from the plurality of serrations, and the second branch connecting the first branch and the body of the first light-shielding plate;

[0073] The angle between the first branch and the horizontal direction is the first angle, and the angle between the second branch and the horizontal direction is the second angle. The first angle is smaller than the second angle.

[0074] In this implementation, firstly, stray light incident from multiple serrated directions can be reflected by the second stub into the multiple serrated directions (or into the second cavity). Secondly, stray light incident away from the multiple serrated directions can be reflected by the first and second stubs towards the light-shielding plate (when the first cavity is provided, it can be reflected into the first cavity). By tilting at two different angles, a semi-enclosing frame can be formed, which not only does not reduce the stray light reduction effect described in the first point above, but also improves the stray light reduction effect in the second point, thus improving the overall light-shielding efficiency.

[0075] In yet another possible implementation of the first aspect, the light-shielding assembly further includes a second light-shielding plate and a third light-shielding plate.

[0076] The first light-shielding plate and the second light-shielding plate are disposed on both sides along the direction from the barrier post to the plurality of saw teeth, and are respectively connected to the first light-shielding plate.

[0077] In this implementation, three light-shielding plates can surround the transceiver field of view of the detection device, reducing the interference of side stray light on detection and improving the light-shielding efficiency.

[0078] In another possible implementation of the first aspect, the light-shielding component is located between the viewing window and the first transparent surface.

[0079] Multiple detection signal lights from the window are incident on the first transparent surface, and the light-shielding component is used to dissipate the energy of at least one detection signal light reflected by the first transparent surface.

[0080] In the above embodiment, when the signal light emitted by the detection device is incident on the first transparent surface, the light-shielding component can reduce the possibility of the signal light reflected from the first transparent surface returning to the detection device, thereby improving the detection accuracy of the detection device. Furthermore, it makes it possible to house the detection device inside the equipment, which will allow the detection device to be protected by optical components, extending its service life.

[0081] In yet another possible implementation of the first aspect, the plurality of probe light signals include a first probe signal light, which is reflected by the first transparent surface to form a first reflected light;

[0082] The first reflected light is transmitted to the plurality of saw teeth, which are used to consume the energy of the first reflected light.

[0083] Consider a possible scenario: without a light-shielding component, the first reflected light is highly likely to undergo diffuse reflection on other objects and thus reach the detection device again. The sawtooth section can dissipate the first reflected light. This dissipation includes absorbing part or all of the first reflected light, and / or reflecting a portion of the first reflected light away from the reflecting end, thereby reducing the energy intensity of the first reflected light.

[0084] In yet another possible implementation of the first aspect, the plurality of probe light signals include a second probe signal light, which is reflected by the first transparent surface to form a second reflected light;

[0085] The second reflected light is transmitted to the plurality of saw teeth and reflected by the plurality of saw teeth to form the third reflected light;

[0086] The third reflected light is transmitted to the barrier post, which is used to block the third reflected light.

[0087] Consider a possible scenario: the second reflected light, formed by reflection from the first transparent surface, may be reflected again by the reflective surface to form a third reflected light. This third reflected light travels approximately parallel to the first light-shielding plate and reaches the detection device, causing the detection device to respond to the third reflected light and resulting in a false detection. In the above embodiment, by using a barrier post that is taller than the sawtooth, the third reflected light (e.g., signals propagating on the surface of the light-shielding plate) that is not consumed by the sawtooth (or reflected from other reflective surfaces) can be blocked by the barrier post, further reducing stray light interference with detection.

[0088] It should be understood that the obstruction here can be absorbed by the barrier pillar, or reflected by the barrier pillar to the side away from the detection device.

[0089] In another possible implementation of the first aspect, the light-shielding component is located between the window and the first transparent surface, and the third detection signal light from the window is transmitted to the barrier post and reflected by the barrier post to form a fourth reflected light, which is transmitted to the first cavity, and the first cavity is used to consume the energy of the fourth reflected light.

[0090] As can be seen, the barrier pillar can reflect the third detection signal light, forming a fourth reflected light. After the fourth reflected light is transmitted to the first cavity, it can be consumed by the first cavity, avoiding the generation of stray light and improving the ranging accuracy of the detection device.

[0091] In another possible implementation of the first aspect, the light-shielding component is located between the viewing window and the first transparent surface.

[0092] The fourth detection signal light from the window is incident on the first transparent surface and reflected by the first transparent surface to form the fifth reflected light;

[0093] The fifth reflected light is transmitted to the plurality of saw teeth and is reflected by the plurality of saw teeth to form the sixth reflected light;

[0094] The sixth reflected light is transmitted to the barrier pillar and reflected by the plurality of sawtooths to form the seventh reflected light, and the second cavity is used to consume the energy of the seventh reflected light.

[0095] In this implementation, the sixth reflected light from the incident barrier column may be reflected to form the seventh reflected light. If the seventh reflected light is transmitted to the first cavity, it is very likely that the first cavity will capture it, reducing the probability that the seventh reflected light will reach the detection device after transmission and improving the light blocking efficiency.

[0096] Secondly, embodiments of this application also provide a detection device, which includes a detection device body and a light-shielding component, wherein the light-shielding component is the light-shielding component described in any one of the first aspects;

[0097] The main body of the detection device includes a viewing window, through which the detection signal light emitted by the main body of the detection device exits;

[0098] The light-shielding component is located outside the viewing window.

[0099] Thirdly, embodiments of this application also provide a terminal, the terminal comprising a detection device, a light-shielding component and a windshield, wherein the light-shielding component is the light-shielding component described in any one of the first aspects;

[0100] The terminal's windshield has a first transparent surface;

[0101] The detection device includes a viewing window, through which the detection signal light emitted by the detection device exits;

[0102] The light-shielding component is disposed between the viewing window and the first transparent surface.

[0103] Optionally, the terminal may be a vehicle, a drone, or a robot.

[0104] The beneficial effects of the second and third aspects of this application can be referred to the beneficial effects of the first aspect, and will not be described in detail here. Attached Figure Description

[0105] The accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0106] Figure 1 This is a schematic diagram of the installation position of a detection device provided in an embodiment of this application;

[0107] Figure 2A This is a schematic diagram of the optical path of stray light provided in an embodiment of this application;

[0108] Figure 2B This is another schematic diagram of the optical path of stray light provided in the embodiments of this application;

[0109] Figure 3 This is a schematic diagram of the structure of a light-shielding component provided in an embodiment of this application;

[0110] Figure 4A This is a schematic diagram of an optical path provided in an embodiment of this application;

[0111] Figure 4B This is a schematic diagram of yet another optical path provided in an embodiment of this application;

[0112] Figure 5This is a schematic diagram of another light-shielding component provided in the embodiments of this application;

[0113] Figure 6 This is a schematic diagram of yet another optical path provided in an embodiment of this application;

[0114] Figure 7 This is a schematic diagram of yet another optical path provided in an embodiment of this application;

[0115] Figure 8A This is a schematic diagram of an optical path provided in an embodiment of this application;

[0116] Figure 8B This is a schematic diagram of an optical path provided in an embodiment of this application;

[0117] Figure 9 This is a schematic diagram of the field of view and optical path of a detection device;

[0118] Figure 10 This is a schematic diagram of a scenario where stray light is generated;

[0119] Figure 11 This is a schematic diagram of another light-shielding component provided in the embodiments of this application;

[0120] Figure 12 This is a schematic diagram of yet another possible optical path provided in the embodiments of this application;

[0121] Figure 13 This is a schematic diagram of another light-shielding component provided in the embodiments of this application;

[0122] Figure 14 This is a schematic diagram of yet another optical path provided in an embodiment of this application;

[0123] Figure 15 This is a schematic diagram of another light-shielding component provided in the embodiments of this application;

[0124] Figure 16 This is a schematic diagram of another light-shielding component provided in the embodiments of this application;

[0125] Figure 17 This is a schematic diagram of another light-shielding component provided in the embodiments of this application;

[0126] Figure 18 This is a schematic diagram of another light-shielding component provided in the embodiments of this application;

[0127] Figure 19 This is a schematic diagram of another light-shielding component provided in the embodiments of this application;

[0128] Figure 20 This is a schematic diagram of another light-shielding component provided in the embodiments of this application;

[0129] Figure 21 This is a schematic diagram of another light-shielding component provided in the embodiments of this application;

[0130] Figure 22 This is a schematic diagram of another light-shielding component provided in the embodiments of this application;

[0131] Figure 23 This is a schematic diagram of another light-shielding component provided in the embodiments of this application;

[0132] Figure 24 This is a schematic diagram of another light-shielding component provided in the embodiments of this application;

[0133] Figure 25A This is a cross-sectional schematic diagram of a possible detection device provided in an embodiment of this application;

[0134] Figure 25B The figure shown is a three-dimensional structural schematic diagram of a possible detection device provided in an embodiment of this application;

[0135] Figure 26A This is a schematic diagram of the structure of a terminal provided in an embodiment of this application;

[0136] Figure 26B This is a schematic diagram of the structure of another terminal provided in the embodiments of this application.

[0137] Figure label:

[0138] 100-Light-shielding assembly; 10-First light-shielding plate; 101-Sawtooth; 102-Barrier post; 1021-First branch; 1022-Second branch; 103-First cavity; 104-Second cavity; 201-Second light-shielding plate; 202-Third light-shielding plate; 30-Bracket; 901-In-vehicle components. Detailed Implementation

[0139] The embodiments of this application will now be described in further detail with reference to the accompanying drawings.

[0140] For ease of understanding, the following examples illustrate some concepts related to the embodiments of this application for reference. As follows:

[0141] 1. Detection device

[0142] The detection device mentioned in the embodiments of this application can be a lidar or other optical detection device, such as a fusion detection device (e.g., a detection device that integrates a radar detector and an image sensor). Taking lidar as an example, the working principle of lidar is to detect targets within the field of view by emitting detection signal light and receiving the returned signal light.

[0143] The detection device in this application embodiment can be used in various fields such as intelligent driving, intelligent transportation, intelligent manufacturing, environmental detection, surveying and mapping, and drones, and can perform one or more functions such as target detection, distance measurement, speed measurement, target tracking, and image recognition.

[0144] The detection device in this application embodiment can be applied to vehicle-mounted detection devices (e.g., vehicle-mounted radar), roadside detection devices (e.g., intersection radar), and other detection devices, such as those installed on drones, robots, railcars, bicycles, traffic lights, speed measuring devices, or base stations. This application does not limit the installation location of the detection device.

[0145] 2. Field of view (FOV)

[0146] There needs to be an uninterrupted line of sight (LOS) between the transmitter of the detection device and the target object, and / or between the receiver of the detection device and the target object. This line of sight can be understood as the field of view.

[0147] In the field of optics, the size of the field of view is related to the field of view angle of the detection device; the larger the field of view angle, the larger the field of view. The field of view angle is the angle formed by the two edges of the maximum range through which the image of the target object can be detected, with the lens of the detection device as the vertex. In this embodiment, the field of view angle in the vertical direction refers to the angle formed by the two edges of the maximum range that can be detected in the vertical direction.

[0148] Installing the detection device inside the equipment can reduce the likelihood of it being corroded by environmental factors such as high temperature, weathering, and rain, thus slowing down the aging process and extending its service life. For example... Figure 1 The diagram shown is a schematic of the installation position of a detection device provided in an embodiment of this application. Taking the detection device installed on a vehicle as an example, the detection device can be installed in the driver's cabin of the vehicle. Since the driver's cabin has a protective shell, it can not only extend the service life, but also detect from the perspective of the driver's cabin, and the availability of the detection results is high.

[0149] However, the signal light emitted by the detection device needs to be transmitted to the outside of the device through transparent devices (such as the casing or windshield) for detection. Transparent devices are usually low-transmittance, high-reflectance, and high-scattering, which will reflect the detection signal light emitted by the lidar, introduce more stray light, interfere with the detection, affect the accuracy of the detection results, and result in poor detection performance.

[0150] Figure 2AThis is a schematic diagram of the optical path of stray light provided in an embodiment of this application. A portion of the detection signal light 1 emitted by the detection device may be reflected by the windshield, forming stray light. This stray light may reflect onto other objects (e.g., objects inside the vehicle), causing diffuse reflection. The stray light formed by this diffuse reflection is highly likely to return to the detection device. For example, the windshield reflects the detection signal light 1, forming stray light 2. This stray light 2 undergoes diffuse reflection on objects inside the vehicle, resulting in stray light 3 entering the viewing window of the detection device and interfering with the detection.

[0151] Figure 2B This is another schematic diagram of the optical path of stray light provided in the embodiments of this application. For information on the detection signal light 1 and stray light 2, please refer to the foregoing. Figure 2B In the process, stray light 4 formed by diffuse reflection may be transmitted to the windshield, be reflected a second time by the windshield, and form stray light 5. The stray light 5 enters the viewing window of the detection device and interferes with the detection.

[0152] The specific process by which stray light interferes with detection is as follows: When stray light enters the detection device, the device responds to it, generating false echoes that cause false detections and missed detections, affecting detection accuracy. For example, stray light 3 formed by diffuse reflection may enter the detection device and be received by its detector, causing it to misdetect the stray light 3 as an echo in the field of view. This might lead the device to mistakenly believe there is a "target" ahead, when in fact it does not exist, thus reducing the accuracy of the detection results. Furthermore, when the signal energy of stray light 3 is strong, it may even overwhelm the true echo in the field of view, leading to a series of problems such as missed detection of the true target's return signal, incorrect distance calculation of the true target, or incorrect reflectivity calculation of the true target, resulting in reduced detection accuracy and poor detection performance of the device.

[0153] In view of this, embodiments of this application provide a light-shielding component, a detection device, and a terminal, which can reduce the interference of stray light on detection, improve the detection accuracy of the detection device, and enhance detection performance.

[0154] The following is a detailed description of the solutions in the embodiments of this application.

[0155] Please see Figure 3 , Figure 3 This is a schematic diagram of a possible light-shielding component provided in an embodiment of this application. The light-shielding component 100 may include a first light-shielding plate 10, on which protruding serrations 101 are provided. The number of serrations 101 may be one or more.

[0156] By incorporating multiple sawtooth segments on the first light-shielding plate, stray light can be absorbed or dispersed when it reaches these segments. Even if it is not absorbed upon first contact with a sawtooth, there is a high probability that it will reflect off another sawtooth segment, gradually reducing the energy intensity of the stray light. Therefore, incorporating multiple sawtooth segments on the light-shielding plate can significantly reduce stray light in the environment, thereby reducing its interference with detection.

[0157] Please see Figure 4A and Figure 4B , Figure 4A This is a schematic diagram of a possible optical path provided in an embodiment of this application. Figure 4B This is a schematic diagram of yet another optical path provided in an embodiment of this application. Figure 4A and Figure 4B In the scenario shown, a light-shielding component is positioned between the detection device and the transparent surface. The detection device can emit multiple detection signal beams; one of these beams (for ease of distinction, referred to as the first detection signal beam) is... Figure 4A The solid line with an arrowhead (referred to as "T1") is reflected by the transparent surface to form the first reflected light (i.e., Figure 4A The solid line with an arrowhead (as indicated by the label "R1") indicates that multiple serrations can consume the energy of the first reflected light R1.

[0158] For example, such as Figure 4A As shown, the first reflected light R1 is absorbed on the surface of the sawtooth after it strikes the sawtooth. For example, in... Figure 4B In the optical path shown, the first reflected light R1 can be reflected multiple times within the gaps between the sawtooths. Since each reflection consumes light energy, the energy intensity of the first reflected light R1 gradually decreases.

[0159] Optionally, multiple serrations can be arranged closely together, meaning the distance between the edges of two serrations is small, or even almost zero. Understandably, when the serrations are arranged closely together, most of the signal light reflected by the transparent surface will illuminate the serrations instead of the plane between them, thereby improving the consumption of stray light and enhancing the light-blocking efficiency.

[0160] Please see Figure 5 , Figure 5 This is a schematic diagram of another possible light-shielding component provided in the embodiments of this application. The light-shielding component 100 includes a first light-shielding plate 10, and a protruding barrier post 102 is provided on the first light-shielding plate 10.

[0161] Optionally, if the first light-shielding plate 10 is provided with a plurality of serrations 101, the barrier post 102 is provided outside the plurality of serrations 101, or is provided between the plurality of serrations 101.

[0162] Alternatively, if the first light-shielding plate 10 is provided with a plurality of serrations 101, the vertical height of the barrier post 102 is higher than the plurality of serrations 101.

[0163] Vertical height refers to the height in the vertical direction, which can be either absolute or relative. Optionally, vertical height can refer to the position of the highest point in the vertical direction (i.e., absolute height). Alternatively, the vertical height of the barrier post 102 is higher than that of the multiple saw teeth 101, which can be understood as: the height between the highest point of the barrier post and the surface of the first light-shielding plate (i.e., relative height) is higher than the height between any one of the multiple saw teeth and the surface of the first light-shielding plate.

[0164] in addition, Figure 5 The multiple serrations 101 shown are arranged closely together, with the bottom of each serration close to the bottom of another serration, so that the plane of the light-shielding plate is not exposed between the serrations as much as possible, resulting in high light-shielding efficiency.

[0165] Please see Figure 6 , Figure 6 This is a schematic diagram of another possible optical path provided in an embodiment of this application. A light-shielding component is disposed between the detection device and the transparent surface. For one of the detection signal beams (for ease of distinction, referred to as the second detection signal beam, i.e....),... Figure 6 The solid line with an arrow (marked "T2") is reflected by the transparent surface to form a second reflected light R2. The second reflected light R2 may be reflected by the sawtooth or other components inside the vehicle, ultimately forming the signal light transmitted by the sunshade. The obstruction post on the first sunshade can block the signal light transmitted by the sunshade.

[0166] like Figure 6 As shown, the second reflected light R2 may be reflected on the sawtooth, forming a third reflected light R3. At this point, the obstruction post can block the third reflected light R3, further reducing stray light interference with the detection. It should be understood that "blocking" here means either being absorbed by the obstruction post or being reflected by the obstruction post in a direction away from the viewing window.

[0167] It should be understood that Figure 6 To illustrate the blocking effect of the barrier pillar, we will use the example of blocking the third reflected light R3, which is partially reflected by the sawtooth, as an example. This does not mean that the barrier pillar can only block light reflected by the sawtooth. In actual implementation, signal light reflected by other components may be blocked by the barrier pillar if the distance between it and the surface of the light shield is less than the height of the barrier pillar.

[0168] The structure of the light-shielding component has been described above by way of example. Below, some possible designs of embodiments of this application are introduced. It should be noted that the various designs described below can be implemented individually or in combination. The combinations will also be described by example below. Several possible designs are described below:

[0169]

Design 1

[0170] As one possible design, the first light-shielding plate is made of a low-reflectivity material. Low-reflectivity materials have a weaker effect on light reflection. Therefore, when stray light reaches the light-shielding plate, the low-reflectivity material can reduce the possibility of stray light being reflected, thereby reducing the interference of stray light on detection.

[0171] As one possible implementation, the surface of the barrier pillar on the first light-shielding plate is made of a low-reflectivity material.

[0172] As an example of the material used for the barrier post, the surface of the barrier post is a first material whose reflectivity is lower than a first threshold. Exemplarily, the first threshold is 40%, or 30%, or 20%, or 10%, or 5%, or 2%, or 1%.

[0173] Optionally, the reflectivity here can be the reflectivity at a preset temperature (usually room temperature, such as around 25 degrees Celsius, or standard conditions, 0 degrees Celsius).

[0174] As another possible implementation, the surfaces of the plurality of serrations are made of a low-reflectivity material.

[0175] As an example of the material used for the serrations, the surface of the plurality of serrations is a second material, the reflectivity of which is lower than a second threshold. For example, the second threshold is 40%, or 30%, or 20%, or 10%, or 5%, or 2%, or 1%.

[0176] In one possible implementation of the first aspect, a portion of the surface of the first light-shielding plate (e.g., the surface where the barrier pillars and sawtooth are set) is made of a low-reflectivity material.

[0177] As an example of the material used for the surface of the light-shielding plate, the surface of the first light-shielding plate is a third material, the reflectivity of which is lower than a third threshold. Exemplarily, the first threshold is 40%, or 30%, or 20%, or 10%, or 5%, or 2%, or 1%.

[0178] Optionally, the surface material of the first light-shielding plate can be the same as the material of the main body of the light-shielding plate. That is, the main body of the light-shielding plate is made of a low-reflectivity material.

[0179] Alternatively, a low-reflectivity material can be applied to the surface of the light-shielding panel through spraying, lamination, or coating. The material of the light-shielding panel is not limited; it can be plastic, metal, glass, polymer materials, etc.

[0180] Optionally, the aforementioned first material, second material, and third material can be the same material or different materials. The aforementioned first threshold, second threshold, and third threshold can be the same material or different materials.

[0181]

Design 2

[0182] Not limited to the aforementioned design, in another possible design, each of the plurality of saw teeth is tilted toward one side of the obstacle post.

[0183] For example, tilt can be represented as follows: in the horizontal direction, the center of gravity of the sawtooth is closer to the obstacle post than the midpoint of the bottom edge of the sawtooth.

[0184] For example, when the cross-section of the saw teeth is triangular, the base of the triangle is the first surface, and the vertical distance between the vertex of the triangle and the base is less than the length of the line connecting the midpoint of the triangle and the base.

[0185] In this design, multiple serrations are tilted, making the serration tips "sharper" and reducing the energy of stray light.

[0186] When the saw teeth are tilted toward the obstacle post, stray light is more likely to be incident on the side of the saw teeth away from the obstacle post. Even if it is not absorbed and / or consumed, it can be reflected toward the side away from the obstacle post.

[0187] As one possible implementation, the light-shielding component is positioned outside the viewing window of the detection device, with the barrier pillar located between the viewing window and multiple sawtooth-like structures.

[0188] like Figure 7 The diagram shows another possible optical path provided in the embodiment of this application. By placing the barrier post between the sawtooth and the window of the detection device, the sawtooth and the barrier post can consume stray light that may enter the window of the detection device, reduce the possibility of stray light entering the detection device, and thus reduce the interference caused by stray light.

[0189] Furthermore, the angled sawtooth pattern makes it more likely that stray light R1 will undergo multiple reflections within the sawtooth, thus absorbing the stray light multiple times. Even if it is not absorbed, it is more likely to be incident on the side of the sawtooth furthest from the viewing window, and thus reflected in a direction away from the viewing window. The above implementation can further reduce the interference from stray light and improve the detection accuracy of the detection device.

[0190] As another possible implementation, the light-shielding component is located between the viewing window and the transparent surface. Each of the plurality of saw teeth includes a first side and a second side, wherein the first side is close to the viewing window and the second side is away from the viewing window. The tilt angle of the second side of the saw tooth is parallel or nearly parallel to most of the stray light reflected from the transparent surface to the saw tooth. This arrangement allows stray light to propagate more accurately between the two saw teeth, thereby improving the saw tooth's ability to consume signal light and increasing light-shielding efficiency.

[0191] Furthermore, the angle between the second side and the horizontal direction is related to the angle between the first transparent surface and the horizontal direction and the field of view of the detection device in the vertical direction.

[0192] Please see Figure 8A , Figure 8A This is a schematic diagram of another possible optical path provided in an embodiment of this application, wherein the field of view of the detection device in the vertical direction is α, and the angle between the transparent surface and the horizontal direction is β. For the detection signal light emitted near the edge of the field of view, its angle with the horizontal direction is α / 2. When this signal light illuminates the transparent surface, the complementary angle of the incident angle is β-α / 2. It is easy to obtain from geometric relationships that the angle between the signal light reflected from the transparent surface and the horizontal direction is 2β-α / 2.

[0193] Since the first side of the sawtooth faces the viewing window of the detection device, stray light incident on the sawtooth is reduced when it is parallel to the second side, thus reducing stray light reflected from the sawtooth to the detection device. The reflectivity of a transparent surface follows this rule: the larger the angle of incidence, the stronger the reflectivity and the greater the stray light. Since the detection signal light near the edge of the field of view incidents on the transparent surface at a relatively large angle, designing the sawtooth's tilt based on the field of view and the tilt of the transparent surface can achieve a better light-blocking effect.

[0194] Optionally, the angle γ between the second side and the horizontal direction satisfies the following formula:

[0195] Where x is close to 0. Here, γ is the angle between the second side and the horizontal direction, α is the field of view angle of the detection device in the vertical direction, β is the angle between the transparent surface and the horizontal direction, and x is the angle between γ and β. The absolute value of the difference between them.

[0196] For example, x = 5° or x = 1°. When the second side is nearly parallel to the direction of the reflected signal, the light signal has a greater chance of being reflected by the sawtooth towards the window away from the detection device, which can further reduce stray light towards the detection device and improve the light-blocking efficiency.

[0197] In one possible solution, x can be 0. That is, the angle between the second side and the horizontal direction satisfies the following equation:

[0198]

[0199] Wherein, γ is the angle between the second side and the horizontal direction, α is the field of view of the detection device, and α is the angle between the first transparent surface and the horizontal direction.

[0200] In the vertical direction, when the detection signal light near the lower edge of the FOV is incident on the transparent surface, the incident angle is larger, resulting in stronger stray light. By setting the angle between the second side and the horizontal direction to be parallel to the direction of the signal light reflected after the detection signal light from the lower edge of the FOV is incident on the transparent surface, the probability of stray light returning to the windshield due to diffuse reflection is reduced. This significantly reduces the possibility of stray light formed by large-angle incident light on the transparent surface entering the detection device, thus improving the light-blocking efficiency.

[0201] As one possible implementation, the angle between the first light-shielding plate and the horizontal direction is half of the field of view of the detection device in the vertical direction.

[0202] Optionally, the barrier pillars and multiple sawtooths are disposed on the first surface of the first light-shielding plate. The angle between the first surface of the first light-shielding plate and the horizontal direction can be used as the angle between the first light-shielding plate and the horizontal direction.

[0203] Please see Figure 8B , Figure 8B This is a schematic diagram of another possible optical path provided in the embodiments of this application. The field of view of the detection device in the vertical direction is α, and the angle between the first surface and the horizontal direction is half of the field of view of the detection device, i.e., α / 2. According to geometric relationships, it is easy to obtain that the angle between the sawtooth and the first surface is 2β-α.

[0204] In the above embodiment, tilting the first light-shielding plate allows it to be positioned closer to the edge of the detection signal light emitted by the detection device without blocking the normal detection signal light. This maximizes space utilization and allows the light-shielding plate to surround the field of view, improving light-shielding efficiency.

[0205]

Design 3

[0206] When the detection device is installed inside the equipment, the light signal at the edge of the field of view may illuminate the internal or external components of the equipment, creating a significant amount of stray light. Additionally, there is often residual light beyond the preset field of view at the edge of the detection device's field of view, which can also cause stray light. This stray light interferes with the detection device's operation and affects its accuracy.

[0207] Please see Figure 9 , Figure 9 This is a schematic diagram of the field of view and optical path of a detection device. Please see below. Figure 9In part (a), the field of view of the detection device in the vertical direction covers the in-vehicle device 901 on which the detection device is installed. As shown in region 902, the detection signal light at the edge of the field of view may illuminate the in-vehicle device 901, causing diffuse reflection on the in-vehicle device 901.

[0208] like Figure 9 In the optical path diagram shown in part (b), the detection signal light 1 near the edge of the field of view is reflected by the in-vehicle device 901 to form stray light 2. The stray light 2 may return directly to the detection device, causing interference.

[0209] like Figure 9 The optical path diagram shown in part (c) indicates that stray light 3 formed after diffuse reflection may also be transmitted to the transparent surface and reflected back to the detection device, causing interference.

[0210] Similarly, stray light from diffuse reflection of external vehicle components can also cause similar issues. Figure 9 The interference is shown in section (b). Please refer to [the original text]. Figure 10 , Figure 10 This is a schematic diagram of a stray light generation scenario. Taking a detection device installed in a vehicle as an example, the detection signal light at the edge of the detection device's field of view is very likely to illuminate the vehicle's hood (or engine cover) 1001, causing diffuse reflection on the hood 1001 and resulting in interference.

[0211] like Figure 11 The light-shielding components shown can solve the above problems. Figure 11 This is a schematic diagram of another possible light-shielding component provided in the embodiments of this application. The first light-shielding plate 10 of the light-shielding component 100 is also provided with a cavity (hereinafter referred to as the first cavity for easy distinction) 103, and the opening of the first cavity 103 is located on the side of the barrier post 102 away from the plurality of saw teeth 101.

[0212] The cavity can absorb stray light entering it. This absorption can occur through surface reception of the cavity or through multiple reflections between the cavity's inner walls, gradually reducing the energy intensity of the stray light. In other words, most stray light is absorbed by the cavity's inner walls; even if stray light is reflected from the inner walls, the reflected light has a high probability of traveling to other inner walls of the cavity, where it is absorbed multiple times, thus reducing the energy intensity of the stray light.

[0213] Optionally, stray light entering the first cavity may be reflected by the barrier pillar. In this embodiment, the first cavity is positioned on the side of the barrier pillar away from the plurality of sawtooths, which can block the detection signal light transmitted close to the light shield, reduce stray light caused by invalid detection signal light, and thus reduce detection interference.

[0214] Please see Figure 12 ,Figure 12 This is a schematic diagram of yet another possible optical path provided in an embodiment of this application. For example... Figure 12 As shown, a beam of detection signal light from the detection device (referred to as the third detection signal light for ease of distinction) Figure 12 As shown, T3) shines onto the obstacle pillar and is reflected by the obstacle pillar to form reflected light (for ease of distinction, it is called the fourth reflected light, i.e. Figure 12 (as shown in R4). The reflected light R4 is transmitted to the second cavity, which can dissipate the energy of the reflected light R4 (by absorption or multiple reflections within the cavity) to avoid the generation of stray light.

[0215] Optionally, the length of the opening of the first cavity is less than the length of the bottom wall of the first cavity. That is, the first cavity is a "narrow-mouthed" cavity. Due to the small opening, when light enters the first cavity, it is lost through multiple reflections within the cavity, suppressing outward emission and further reducing the possibility of stray light entering the detection device, thereby improving the light-shielding efficiency.

[0216] For example, the cross-sectional shape of the first cavity can be trapezoidal or approximately trapezoidal, with the lower part of the trapezoid forming the bottom wall of the cavity and the upper part forming the opening of the cavity. Alternatively, the first cavity can be shaped like a jar with a wide belly and a narrow opening.

[0217] Optionally, the length of the opening of the first cavity is the length of the opening of the first cavity along the direction from the barrier post to the multiple saw teeth. Similarly, the length of the bottom wall is the length of the opening of the first cavity along the direction from the barrier post to the multiple saw teeth.

[0218] As one possible implementation, the aforementioned third detection signal light T3 is a detection signal light at the edge of the field of view of the detection device.

[0219] Optionally, the detection device is installed inside the equipment, and the third detection signal light is extended along the propagation direction and intersects with the equipment (or the device's components).

[0220] In one possible scenario, the detection device is installed inside the vehicle, and the propagation direction of the third detection light is extended to intersect with the vehicle's hood.

[0221] In another possible scenario, the detection device is installed on the vehicle's instrument panel (IP) (or IP repeater), and the propagation direction of the third detection light is extended to intersect with the vehicle's instrument panel.

[0222] It can be seen that the third detection signal light is an invalid signal light that was originally meant to illuminate the instrument panel and / or the hood. By passing through the barrier pillar and the second cavity, the invalid signal can be blocked and consumed, avoiding the generation of stray light and improving the ranging accuracy of the detection device.

[0223]

Design 4

[0224] Figure 13 This is a schematic diagram of another possible light-shielding component provided in the embodiments of this application. The first light-shielding plate 10 of the light-shielding component 100 is also provided with a cavity (hereinafter referred to as the second cavity for easy distinction) 104, and the opening of the second cavity 104 is located between the plurality of saw teeth 101 and the barrier post 102.

[0225] The second cavity 104 can dissipate incoming stray light. This dissipation can occur through absorption within the cavity or through multiple reflections between the inner walls of the cavity, thereby consuming the energy of the stray light. That is, some stray light may be absorbed by the inner walls of the cavity; even if the stray light is reflected inside the cavity, the reflected signal light has a high probability of being transmitted to other inner walls of the cavity, thus being absorbed multiple times and consuming the energy of the stray light.

[0226] Optionally, stray light entering the second cavity may be reflected by a barrier column. Figure 14 This is a schematic diagram of another possible optical path provided in an embodiment of this application, where a light-shielding component is disposed between the viewing window and the transparent surface of the detection device. A beam of detection signal light from the detection device (for ease of distinction, referred to as the fourth detection signal light, i.e.) Figure 14 When T4 (as shown) is irradiated onto a transparent surface, the first transparent surface reflects the light, forming reflected light (for ease of distinction, this is called the fifth reflected light, i.e.) Figure 14 (As shown in R5). The fifth reflected light R5 is transmitted to the plurality of saw teeth and is reflected by the plurality of saw teeth to form the sixth reflected light R6. When the sixth reflected light R6 is transmitted to the barrier post, it is partially reflected by the barrier post. For example, the resulting seventh reflected light R7 is transmitted to the second cavity, which is used to consume the energy of the seventh reflected light R7.

[0227] Optionally, the second cavity can be narrow-apertured. Due to the smaller opening, stray light entering the second cavity undergoes multiple reflections and losses within the cavity, suppressing outward emission and further improving the light-shielding efficiency. For example, the cross-sectional shape of the second cavity can be trapezoidal or approximately trapezoidal, with the lower part of the trapezoid forming the bottom wall of the cavity and the upper part forming the opening. Alternatively, the second cavity can be shaped like a jar with a wide belly and a narrow opening.

[0228] Optionally, the length of the opening of the second cavity is the length of the opening of the second cavity along the direction from the barrier post to the multiple saw teeth. Similarly, the length of the bottom wall is the length of the opening of the second cavity along the direction from the barrier post to the multiple saw teeth.

[0229]

Design 5

[0230] Not limited to the aforementioned design, in one possible design, the barrier post is tilted away from the side with multiple serrations.

[0231] Please see Figure 15 ,Figure 15 This is a schematic diagram of another possible light-shielding component provided in the embodiments of this application. For example... Figure 15 As shown, the barrier post 102 on the first light-shielding plate 10 is tilted to one side away from the plurality of saw teeth 101.

[0232] In this implementation, when the barrier post is tilted away from the multiple saw teeth, stray light can be reflected into the extinction cavity, improving the light-blocking efficiency. At this time, placing the detection device on the side of the barrier post away from the multiple saw teeth allows the barrier post to specifically reflect stray light to the side away from the detection device, further reducing the possibility of stray light entering the detection device, thereby reducing interference from stray light formation.

[0233] Furthermore, when a first cavity 103 is provided on the first light-shielding plate, the obstruction column is tilted to one side of the first cavity 103, which can increase the possibility of stray light from one side of the first cavity 103 being reflected back to the first cavity by the obstruction column, further reducing the interference caused by stray light and improving the light-shielding efficiency.

[0234] Optionally, the angle between the barrier post and the surface of the light-shielding plate falls within [35°, 45°]. In this case, the degree of inclination is moderate, which can create an enclosing effect on the first cavity, preventing stray light from escaping from the first cavity and improving light-shielding efficiency. Here, the surface of the first light-shielding plate can refer to the surface of the first light-shielding plate where the first barrier post is located.

[0235] Optionally, the top of the barrier post can be parallel to the first surface or parallel to the edge of the field of view of the detection device to reduce stray light caused by the top of the barrier post.

[0236] Please see Figure 16 , Figure 16 This is a schematic diagram of another possible light-shielding component provided in the embodiments of this application. For example... Figure 16 As shown, the obstacle pillar includes a first branch 1021 and a second branch 1022, with the first branch 1021 and the second branch 1022 tilting toward the second side.

[0237] The second branch 1022 connects the first branch 1021 and the main body of the first light-shielding plate 10. The angle between the first branch 1021 and the horizontal direction is the first angle (e.g., Figure 16 The angle marked ①), the angle between the second branch 1022 and the horizontal direction is the second angle, the first angle is greater than the second angle (e.g., the angle between the first branch 1022 and the horizontal direction is the second angle, the first angle is greater than the second angle). Figure 16 (The angle marked ②).

[0238] In this implementation, firstly, stray light incident from multiple serrated directions can be reflected by the second stub into the multiple serrated directions (or into the second cavity). Secondly, stray light incident away from the multiple serrated directions can be reflected by the first and second stubs towards the light-shielding plate (when the first cavity is provided, it can be reflected into the first cavity). By tilting at two different angles, a semi-enclosing frame can be formed, which not only does not reduce the stray light reduction effect described in the first point above, but also improves the stray light reduction effect in the second point, thus improving the overall light-shielding efficiency.

[0239] Optionally, when the cross-section of the branch is an irregular shape, the angle between the side of the first branch away from the multiple serrations and the horizontal direction is the aforementioned first angle, and the angle between the side of the second branch away from the multiple serrations and the horizontal direction is the aforementioned second angle.

[0240] Please see Figure 17 , Figure 17 This is a schematic diagram of another possible light-shielding component provided in the embodiments of this application. The cross-sections of the first branch 1021 and the second branch 1022 are both irregular shapes. For the first branch 1021, the side closer to and away from the multiple serrations is inclined in the direction away from the multiple serrations, and the side closer to the multiple serrations is inclined in the direction of the multiple serrations, thus providing a good blocking effect for stray light from both sides.

[0241] At this point, the angle between the side of the first branch 1021 furthest from the multiple serrations and the horizontal direction is the first angle (e.g., Figure 17 (The angle marked ①). Similarly, the angle between the side of the first branch 1021 away from the multiple serrations and the horizontal direction is the second angle (e.g., Figure 17 (The angle marked ②).

[0242]

Design 6

[0243] Optionally, the cross-section of the first light-shielding plate is trapezoidal or inverted V-shaped.

[0244] Please see Figure 18 , Figure 18 This is a schematic diagram of another possible light-shielding component provided in this application embodiment. The first light-shielding plate 10 in the light-shielding component 100 is a stepped structure. The stepped structure includes an upper bottom surface and a side waist section.

[0245] As one possible implementation, the barrier post 102 is disposed at the waist of the first light-shielding plate.

[0246] Understandably, the incident angle and reflectivity are positively correlated. That is, the larger the incident angle of the detection signal light on the first transparent surface, the higher the reflectivity of the first transparent surface to the detection signal light, and the more stray light is generated. Since the detection device emits detection signal light, the incident angle is relatively large when it hits the first transparent surface at the edge of the field of view. Therefore, stray light is mainly distributed on both sides (i.e., the waist) of the light shield.

[0247] In the above embodiments, by using a trapezoidal structure (inverted V-shaped when the top surface is not considered), the barrier post is set at the waist of the trapezoid, which can effectively suppress stray light generated at the edge of the field of view that is incident on the first transparent surface, thereby improving the light-blocking efficiency.

[0248] Optionally, the top surface may not have obstacle pillars. In some scenarios, the top surface falls within a small field of view.

[0249] Optionally, the first light-shielding plate is symmetrical about its centerline. For example, in Figure 18 In the light-shielding assembly shown, the center line is the line connecting the midpoint of the first side and the midpoint of the second side of the first light-shielding plate 10, and this center line is located on the upper bottom surface.

[0250] In this implementation, the relatively symmetrical design ensures a more even shading effect on both sides of the field of view, avoiding discrepancies in detection accuracy between the left and right sides, thus improving service quality and user experience. It should be understood that absolute symmetry on both sides may not be achievable in actual implementation; the description of relative symmetry is used here to indicate that the two sides of the first shading plate may have similar designs.

[0251] In one possible implementation, the first cavity 103 extends from one side of the waist of the first light-shielding plate 10 to the other side of the waist, passing over the upper bottom surface. For example... Figure 18 As shown, the first cavity 103 extends from the third side to the fourth side of the first light shield 10.

[0252] As another possible implementation, the first cavity is disposed at the waist of the first light-shielding plate. Disposing the first cavity at the waist can suppress stray light entering at the edge of the field of view, thereby improving light-shielding efficiency.

[0253] Optionally, in the direction from the third side to the fourth side, the length of the first cavity is the same as or similar to the length of the barrier post. For example, the difference between the length of the first cavity and the length of the barrier post is less than or equal to 20%, 10%, or 5% of the length of the second cavity.

[0254] Since the second cavity can be used in conjunction with the barrier post, setting the length of the second cavity to be equivalent to the length of the barrier post can improve the light-blocking effect.

[0255] In one possible implementation, the second cavity extends from the waist of one side of the first light-shielding plate to the waist of the other side, passing over the upper bottom surface.

[0256] As another possible implementation, the second cavity is disposed at the waist of the first light-shielding plate. Distributing the second cavity at the waist can suppress stray light entering at the edge of the field of view, thereby improving light-shielding efficiency.

[0257] Optionally, in the direction from the third side to the fourth side, the length of the second cavity is the same as or similar to the length of the barrier post.

[0258] As one possible implementation, multiple serrations are arranged on the waist of the first light-shielding plate. For example... Figure 18 As shown, serrations 101 are disposed at the waist of the trapezoid. By disposing of multiple serrations at the waist, stray light entering at the edge of the field of view can be suppressed, thereby improving the light-blocking efficiency.

[0259] As another possible implementation, a plurality of serrations extend from the waist of one side of the first light-shielding plate to the waist of the other side, passing over the upper bottom surface. That is, the plurality of serrations are disposed on the waist of the first light-shielding plate and the upper bottom surface of the first light-shielding plate.

[0260] Figure 19 This is a schematic diagram of another possible light-shielding component provided in the embodiments of this application. In the light-shielding component 100, a plurality of serrations on the first light-shielding plate 10 extend from the waist of one side (e.g., the third side) of the first light-shielding plate to the waist of another side (e.g., the fourth side), passing through the upper bottom surface.

[0261] In this implementation, the multiple saw teeth are designed as a continuous structure from the third to the fourth side, avoiding the introduction of new reflective surfaces at the ends of the saw teeth and reducing the probability of stray light generation. The multiple saw teeth are arranged along a trapezoidal shape, with inverted V-shapes on both sides and the middle part distributed along the top surface. This allows stray light incident on the saw teeth to be reflected towards the sidewall of another saw tooth, minimizing the reflection of stray light to the detection device and reducing the energy of the stray light.

[0262] Optionally, in the trapezoidal light-shielding plate, the upper base of the trapezoid is parallel to the horizontal plane. In this case, the portion of the multiple serrations on the upper base of the trapezoidal structure is also parallel to the horizontal plane.

[0263] In this implementation, the multiple serrations are designed to extend from one side of the waist to the top surface and then to the other side of the waist, avoiding the introduction of new reflective surfaces near the top surface and reducing the probability of generating stray light.

[0264] Optionally, the cross-section of the serrations can be tooth-shaped, such as triangular.

[0265]

Design 7

[0266] Not limited to the aforementioned design, in another possible design, the light-shielding assembly also includes a second light-shielding plate and a third light-shielding plate, with the first light-shielding plate and the second light-shielding plate disposed on both sides along the direction from the barrier post to the plurality of saw teeth, and respectively connected to the first light-shielding plate.

[0267] Please see Figure 20 , Figure 20 This is a schematic diagram of another possible light-shielding component provided in this application embodiment. The light-shielding component 100 includes a first light-shielding plate 10, a second light-shielding plate 201, and a third light-shielding plate 202. The second light-shielding plate 201 is disposed on and connected to the third side of the first light-shielding plate 10, and the third light-shielding plate 202 is disposed on and connected to the fourth side of the first light-shielding plate 10. The second light-shielding plate 201 and the third light-shielding plate 202 surround a portion of the surface of the first light-shielding plate 10. In this embodiment, the three light-shielding plates can surround the transceiver field of view of the detection device, reduce the interference of side stray light on detection, and improve the light-shielding efficiency.

[0268] As one possible implementation, the second light-shielding plate 201 may also have a structure similar to the first light-shielding plate 10, such as having serrations, as specifically described in the design of the first light-shielding plate 10. Similarly, the third light-shielding plate 202 may also have a structure similar to the first light-shielding plate 10.

[0269] Optionally, the light-shielding assembly also includes a bracket 30, which can connect the first light-shielding plate 10, the second light-shielding plate 201 and the third light-shielding plate 202, making the structure of the light-shielding assembly 100 more stable.

[0270] In addition, in some scenarios, the light-shielding component 100 can be more stably installed on the detection device through the bracket 30 to prevent it from falling off and improve stability.

[0271] The above describes various possible designs in the embodiments of this application. The following are some examples of combining multiple designs.

[0272] Please see Figure 21 , Figure 21 This is a schematic diagram of another possible light-shielding component provided in the embodiments of this application. The light-shielding component 100 includes a first light-shielding plate 10, on which serrations 101, barrier posts 102 and a first cavity 103 are provided.

[0273] The first light-shielding plate is inclined. When the light-shielding assembly is used to shield the detection device from light, the upper surface of the first light-shielding plate is parallel to the edge of the field of view of the detection device.

[0274] Please see Figure 22 , Figure 22This is a schematic diagram of another possible light-shielding component provided in the embodiments of this application. The light-shielding component 100 includes a first light-shielding plate 10, on which serrations 101, barrier posts 102, a first cavity 103, and a second cavity 104 are provided.

[0275] The first light-shielding plate is inclined. When the light-shielding assembly is used to shield the detection device from light, the upper surface of the first light-shielding plate is parallel to the edge of the field of view of the detection device.

[0276] Please see Figure 23 , Figure 23 This is a schematic diagram of another possible light-shielding component provided in the embodiments of this application. The light-shielding component 100 includes a first light-shielding plate 10, a second light-shielding plate 201 and a third light-shielding plate 202. The second light-shielding plate 201 and the third light-shielding plate 202 surround a portion of the surface of the first light-shielding plate 10. The first light-shielding plate 10 is provided with serrations 101, barrier posts 102, a first cavity 103 and a second cavity 104.

[0277] The first light-shielding plate has a trapezoidal structure, with sawtooth 101, barrier column 102, first cavity 103 and second cavity 104 located at the waist of the trapezoid.

[0278] Please see Figure 24 , Figure 24 This is a schematic diagram of another possible light-shielding component provided in the embodiments of this application. The light-shielding component 100 includes a first light-shielding plate 10, a second light-shielding plate 201 and a third light-shielding plate 202. The second light-shielding plate 201 and the third light-shielding plate 202 surround a portion of the surface of the first light-shielding plate 10. The first light-shielding plate 10 is provided with serrations 101, barrier posts 102, a first cavity 103 and a second cavity 104.

[0279] The first light-shielding plate 10 has a trapezoidal structure, with the barrier column 102, the first cavity 103, and the second cavity 104 located at the waist of the trapezoid. Multiple serrations 101 extend from the waist of one side (e.g., the third side) of the first light-shielding plate 10, through the upper bottom surface, to the waist of the other side (e.g., the fourth side) of the first light-shielding plate 10.

[0280] This application embodiment also provides a detection device, which includes the aforementioned light-shielding component, for example... Figure 3 , Figure 5 , Figure 9 , Figure 14 , Figure 15 , Figure 17 , Figure 18 , Figure 19 , Figure 20 , Figure 21 , Figure 22 , Figure 23 ,or Figure 24The light-shielding components described in the embodiments, and / or their possible implementations.

[0281] Please see Figure 25A and Figure 25B , Figure 25A This is a cross-sectional schematic diagram of a possible detection device provided in an embodiment of this application. Figure 25B The figure shown is a three-dimensional structural schematic diagram of a possible detection device provided in an embodiment of this application.

[0282] like Figure 25A and Figure 25B As shown, the detection device 250 includes a detection device body and a light-shielding component. The light-shielding component is the aforementioned light-shielding component, and the relevant description can be found in the foregoing embodiments.

[0283] The main body of the detection device includes a window through which the detection signal light emitted by the main body of the detection device is emitted; a light-shielding component is disposed outside the window.

[0284] Optionally, the obstruction posts on the light-shielding plate in the light-shielding assembly are closer to the window than the sawtooth pattern.

[0285] Optionally, the detection device column also includes a receiver for receiving the echo signal corresponding to the detection signal light. This echo signal is used to obtain relevant information about the target within the field of view, such as the target's position, shape, or velocity.

[0286] This application embodiment also provides a terminal, which includes a detection device, a light-shielding component, and a windshield, wherein the light-shielding component is the aforementioned light-shielding component, for example... Figure 3 , Figure 5 , Figure 9 , Figure 14 , Figure 15 , Figure 17 , Figure 18 , Figure 19 , Figure 20 , Figure 21 , Figure 22 , Figure 23 ,or Figure 24 The light-shielding components described in the embodiments, and / or their possible implementations.

[0287] The detection device includes a window through which the detection signal light emitted by the detection device exits;

[0288] The detection device is installed inside the windshield of the terminal, the windshield of the terminal has a first transparent surface, and the light-shielding component is disposed between the viewing window and the first transparent surface.

[0289] Optionally, the aforementioned terminals may include mobile platforms or transportation vehicles such as vehicles, ships, airplanes, trains, spacecraft, drones, and robots.

[0290] Figure 26A This is a schematic diagram of a possible terminal structure provided in an embodiment of this application. Taking a vehicle as an example, the vehicle includes a detection device and a light-shielding component, both of which are disposed inside the vehicle's windshield. Optionally, the detection device can be disposed on the vehicle's dashboard.

[0291] By using a light-shielding component, stray light in front of the detection device can be significantly reduced, improving the device's ability to resist stray light interference. This allows the detection device to maintain good signal effectiveness when installed inside the vehicle cabin, thus protecting it from external high temperatures, rain, and weathering. This not only extends the lifespan of the lidar but also makes its installation location more flexible, enhancing the user experience.

[0292] It should be understood that Figure 26A The installation location of the detection device shown is merely an example. In actual implementation, the detection device can be installed inside the transparent casing at any location on the terminal. For example, Figure 26B The diagram shown is a structural schematic of another possible terminal provided in this application embodiment, in which the detection device and the light-shielding assembly are both installed inside the vehicle's windshield. The detection device is positioned above the driver's cabin and can be optionally fixed using a mounting bracket to maintain stability.

[0293] In the description of this application, the terms “center,” “upper,” “lower,” “vertical,” “horizontal,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0294] In this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0295] In this application, "at least one" in the embodiments refers to one or more items, and "more than one" refers to two or more items. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can represent: a, b, c, (a and b), (a and c), (b and c), or (a and b and c), where a, b, and c can be single or multiple. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0296] Furthermore, unless otherwise stated, the use of ordinal numbers such as "first" and "second" in the embodiments of this application is for distinguishing multiple objects and is not for limiting the order, timing, priority, or importance of multiple objects. For example, "first detection signal light" and "second detection signal light" are only for ease of description and do not indicate that the first detection signal light and the second detection signal light are different in terms of source, order, importance, etc. In some embodiments, the first detection signal light and the second detection signal light may also be the same detection signal light.

[0297] In the above embodiments, the term "when..." can be interpreted, depending on the context, as meaning "if...", "after...", "in response to determining...", or "in response to detecting...". The above descriptions are merely optional embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the concept and principles of this application should be included within the protection scope of this application.

[0298] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

Claims

1. A light-shielding component, characterized in that, The light-shielding component includes: A first light-shielding plate is provided with protruding barrier posts and multiple protruding saw teeth, wherein the vertical height of the barrier posts is higher than that of the multiple saw teeth; The barrier post includes a first branch and a second branch. The first branch is inclined to the side away from the plurality of serrations, and the second branch connects the first branch and the main body of the first light-shielding plate. The angle between the first branch and the horizontal direction is the first angle, and the angle between the second branch and the horizontal direction is the second angle. The first angle is smaller than the second angle.

2. The light-shielding component according to claim 1, characterized in that, The material of the surface of the barrier pillar and the material of the surface of the plurality of serrations are a first material, and the reflectivity of the first material is lower than a first threshold.

3. The light-shielding component according to claim 1, characterized in that, Each of the plurality of saw teeth is tilted toward one side of the obstacle post.

4. The light-shielding component according to claim 1, characterized in that, The light-shielding component is disposed outside the viewing window of the detection device; The obstacle pillar is located between the view window and the plurality of serrations.

5. The light-shielding component according to claim 4, characterized in that, The light-shielding component is located between the viewing window and the first transparent surface, and each of the plurality of serrations includes a first side and a second side, the first side being close to the viewing window and the second side being away from the viewing window; The angle between the second side and the horizontal direction is related to the angle between the first transparent surface and the horizontal direction and the field of view of the detection device in the vertical direction.

6. The light-shielding component according to claim 5, characterized in that, The angle between the second side and the horizontal direction satisfies the following formula: ， in, Let be the angle between the second side and the horizontal direction. The field of view of the detection device is [angle]. The angle between the first transparent surface and the horizontal direction is denoted as .

7. The light-shielding assembly according to claim 5, wherein the angle between the first light-shielding plate and the horizontal direction is half of the field of view angle of the detection device in the vertical direction.

8. The light-shielding component according to any one of claims 1-7, characterized in that, The first light-shielding plate is also provided with a first cavity, and the opening of the first cavity is located on the side of the barrier post away from the plurality of saw teeth; The length of the opening of the first cavity is less than the length of the bottom wall of the first cavity.

9. The light-shielding component according to any one of claims 1-7, characterized in that, The first light-shielding plate is also provided with a second cavity, the opening of which is located between the barrier post and the plurality of saw teeth; The length of the opening of the second cavity is less than the length of the bottom wall of the second cavity.

10. The light-shielding component according to any one of claims 1-7, characterized in that, The first light-shielding plate has a tiered structure, and the barrier column is located at the waist of the first light-shielding plate.

11. The light-shielding component according to claim 10, characterized in that, The plurality of serrations are disposed on the waist of the first light-shielding plate.

12. The light-shielding component according to any one of claims 1-7, characterized in that, The plurality of saw teeth are achieved by a columnar body with a triangular cross-section, and the saw teeth extend from the waist of one side of the first light shield to the waist of the other side of the first light shield.

13. The light-shielding component according to any one of claims 1-7, characterized in that, The barrier post is tilted away from the plurality of saw teeth, and the angle between the barrier post and the surface of the first light-shielding plate falls within [35°, 45°].

14. The light-shielding assembly according to any one of claims 1-7, wherein the light-shielding assembly further comprises a second light-shielding plate and a third light-shielding plate. The first light-shielding plate and the second light-shielding plate are disposed on both sides along the direction from the barrier post to the plurality of saw teeth, and are respectively connected to the first light-shielding plate.

15. The light-shielding component according to claim 14, characterized in that, The light-shielding component is located between the viewing window of the detection device and the first transparent surface. Multiple detection signal lights from the window are incident on the first transparent surface, and the light-shielding component is used to dissipate the energy of at least one detection signal light reflected by the first transparent surface.

16. The light-shielding component according to claim 15, characterized in that, The plurality of detection signal lights include a first detection signal light, which is reflected by the first transparent surface to form a first reflected light; The first reflected light is transmitted to the plurality of saw teeth, which are used to consume the energy of the first reflected light.

17. The light-shielding component according to claim 15, characterized in that, The plurality of detection signal lights include a second detection signal light, which is reflected by the first transparent surface to form a second reflected light; The second reflected light is transmitted to the plurality of saw teeth and reflected by the plurality of saw teeth to form the third reflected light; The third reflected light is transmitted to the barrier post, which is used to block the third reflected light.

18. The light-shielding component according to claim 8, characterized in that, The light-shielding component is located between the viewing window of the detection device and the first transparent surface. The third detection signal light from the window is transmitted to the barrier post and reflected by the barrier post to form a fourth reflected light. The fourth reflected light is transmitted to the first cavity, and the first cavity is used to consume the energy of the fourth reflected light.

19. The light-shielding component according to claim 9, characterized in that, The light-shielding component is located between the viewing window of the detection device and the first transparent surface. The fourth detection signal light from the window is incident on the first transparent surface and reflected by the first transparent surface to form the fifth reflected light; The fifth reflected light is transmitted to the plurality of saw teeth and is reflected by the plurality of saw teeth to form the sixth reflected light; The sixth reflected light is transmitted to the barrier pillar and reflected by the plurality of sawtooths to form the seventh reflected light, and the second cavity is used to consume the energy of the seventh reflected light.

20. A detection device, characterized in that, The detection device includes a detection device body and a light-shielding component, wherein the light-shielding component is the light-shielding component according to any one of claims 1-19; The main body of the detection device includes a viewing window, through which the detection signal light emitted by the main body of the detection device exits; The light-shielding component is located outside the viewing window.

21. A terminal, characterized in that, The terminal includes a detection device, a light-shielding component, and a windshield, wherein the light-shielding component is the light-shielding component according to any one of claims 1-19; The terminal's windshield has a first transparent surface; The detection device includes a viewing window, through which the detection signal light emitted by the detection device exits; The light-shielding component is disposed between the viewing window and the first transparent surface.

22. The terminal according to claim 21, characterized in that, The terminal can be a vehicle, drone, or robot.

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