Lidar

Abstract

The embodiment of the application discloses a kind of laser radars, including shell, lens module, transmitting circuit board and receiving circuit board, numerical control board, support sheet metal part, power board;Lens module is set in shell;Transmitting circuit board and receiving circuit board are all set in shell, transmitting circuit board is pressed in lens module, to emit laser by lens module, receiving circuit board is pressed in lens module and is spaced apart from transmitting circuit board, to receive echo light by lens module;Numerical control board is set in shell, and with transmitting circuit board and receiving circuit board are electrically connected;Support sheet metal part is set in numerical control board;Power board is set to the side of support sheet metal part away from numerical control board, and with numerical control board electrically connected;Wherein, numerical control board and power board are all grounded by support sheet metal part.The numerical control board and power board in the embodiment are all grounded by support sheet metal part, can effectively reduce electromagnetic interference.

Description

Technical Field

[0001] This application relates to the field of lidar technology, and in particular to a lidar. Background Technology

[0002] LiDAR (Light Detection and Ranging) is a remote sensing technology that uses lasers to measure distance and detect velocity. It measures the distance, velocity, and direction of a target object by emitting laser pulses and receiving the reflected light. Due to its high precision and high resolution, LiDAR is widely used in fields such as autonomous driving, geographic mapping, and environmental monitoring.

[0003] LiDAR typically consists of a transmitting module, a receiving module, a processing module, and a control module, which work together to achieve basic functions such as distance measurement, velocity detection, and 3D modeling.

[0004] However, in the process of realizing these basic functions, due to the lack of effective grounding and shielding measures, lidar is not only susceptible to electromagnetic interference, but may also interfere with surrounding electronic equipment. Summary of the Invention

[0005] This application provides a lidar that can effectively reduce electromagnetic interference.

[0006] In a first aspect, embodiments of this application provide a lidar, including a housing, a lens module, a transmitting circuit board and a receiving circuit board, a CNC board, a supporting sheet metal part, and a power board; the lens module is disposed within the housing; both the transmitting circuit board and the receiving circuit board are disposed within the housing, the transmitting circuit board is pressed against the lens module to emit laser light through the lens module, and the receiving circuit board is pressed against the lens module and spaced apart from the transmitting circuit board to receive echo light through the lens module; the CNC board is disposed within the housing and is electrically connected to both the transmitting circuit board and the receiving circuit board; the supporting sheet metal part is disposed on the CNC board; the power board is disposed on the side of the supporting sheet metal part away from the CNC board and is electrically connected to the CNC board; wherein, both the CNC board and the power board are grounded through the supporting sheet metal part.

[0007] In some embodiments, a metal shield is further included, disposed within the housing, and pressed against the side of the transmitting circuit board and / or the receiving circuit board away from the lens module, so as to sandwich the transmitting circuit board and / or the receiving circuit board between the metal shield and the lens module.

[0008] In some embodiments, the housing includes a base and a top cover disposed on the base, the CNC board is mounted on the base, and the lidar further includes a first conductive strip sandwiched between the CNC board and the base, and continuously or intermittently surrounding the outer periphery of the electronic components on the CNC board.

[0009] In some embodiments, the CNC board includes a high-speed signal area, the first conductive adhesive strip surrounds the outer periphery of the high-speed signal area, and the supporting sheet metal part is disposed on the side of the high-speed signal area away from the base.

[0010] In some embodiments, a second conductive adhesive strip is further included, disposed at the connection between the base and the top cover, and sandwiched between the base and the top cover.

[0011] In some embodiments, the inner bottom surface of the base has a mounting groove, and the lidar further includes a rotating mirror mount and a rotating mirror. At least a portion of the rotating mirror mount is embedded in the mounting groove to reduce the gap between the rotating mirror mount and the inner bottom surface of the base. The rotating mirror is disposed on the rotating mirror mount and is disposed opposite to the lens module.

[0012] In some embodiments, a first gap exists between the bottom of the lens module and the CNC plate, and a second gap exists between the top of the lens module and the upper cover. The lidar further includes a plurality of conductive components disposed within the first gap and / or the second gap to enclose a shielding cavity within the first gap and / or the second gap. The conductive components include at least one of laser engraving, conductive adhesive, conductive foam, conductive spring, conductive copper foil, conductive aluminum foil, and conductive graphite.

[0013] In some embodiments, the base or the top cover has a connection opening, and the lidar further includes an interface connector and an interface flexible plate, with the interface connector passing through the connection opening; the interface flexible plate includes a main body and a branch portion that are interconnected, the main body portion electrically connecting the interface connector to the power board, and the branch portion being grounded through the supporting sheet metal part.

[0014] In some embodiments, the lidar further includes a receiving flexible plate electrically connecting the CNC board and the receiving circuit board. The upper cover includes a cover body and a shielding member. The cover body covers the base. The shielding member is connected to the cover body, protrudes toward the base, and is located between the interface flexible plate and the receiving flexible plate.

[0015] In some embodiments, the receiving flexible board has a clock signal trace, in which a ferrite bead is connected in series.

[0016] In some embodiments, the base includes a base plate and a surrounding plate connected to the edge of the base plate. The lidar further includes a emitting flexible plate, a first laser engraving element and a second laser engraving element. The first laser engraving element electrically connects the emitting flexible plate to the lens module, and the lens module is electrically connected to the base plate. The second laser engraving element electrically connects the receiving flexible plate to the surrounding plate.

[0017] In some embodiments, the housing includes a honeycomb structure and a waterproof and breathable membrane, wherein the honeycomb structure has a plurality of honeycomb holes; the waterproof and breathable membrane is disposed on the honeycomb structure.

[0018] Based on the lidar provided in this application, the transmitting circuit board, receiving circuit board, CNC board and power supply board are compactly arranged in a housing, which can reduce additional space requirements, making the overall size of the lidar smaller and easier to integrate into the device.

[0019] When the CNC board and power board are grounded through the supporting sheet metal, a low-impedance path is formed. This path effectively conducts and dissipates internally generated electromagnetic interference (EMI). Since EMI encounters lower resistance during conduction, it is more easily guided to the ground. Understanding this, when the CNC board and power board are grounded through the supporting sheet metal, it means they are electrically connected to a common reference point, providing a low-impedance path that allows internally generated EMI to be safely conducted to the reference point, thereby reducing the equipment's external electromagnetic radiation. If left untreated, EMI radiates into the surrounding environment as electromagnetic waves, potentially interfering with the normal operation of other electronic devices. Effective grounding design guides this interference to the ground, preventing it from radiating and affecting the surrounding environment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of a lidar provided in an embodiment of this application;

[0022] Figure 2 This is an exploded view of the lidar provided in the embodiments of this application;

[0023] Figure 3 This is another exploded view of the lidar provided in the embodiments of this application (with the top cover hidden);

[0024] Figure 4 This is another exploded view of the lidar provided in the embodiments of this application (with the top cover hidden);

[0025] Figure 5 This is another three-dimensional structural diagram of the lidar provided in the embodiments of this application (with the top cover hidden);

[0026] Figure 6 yes Figure 5 A magnified view of a portion of point A in the middle;

[0027] Figure 7 This is an exploded view of the lidar provided in an embodiment of this application from another angle;

[0028] Figure 8 This is another exploded view of the lidar provided in the embodiments of this application (with the top cover hidden);

[0029] Figure 9 yes Figure 8 A magnified view of a portion of point B in the middle;

[0030] Figure 10 This is another three-dimensional schematic diagram of the lidar provided in the embodiments of this application (with the top cover hidden).

[0031] Attached are the icon markings:

[0032] 1. LiDAR; 10. Housing; 10a. First gap; 10b. Second gap; 11. Base; 11a. Mounting slot; 11b. Connection opening; 111. Base plate; 112. Enclosure; 1121. Back plate; 1122. First side plate; 113. Waterproof protrusion; 12. Top cover; 121. Cover body; 1211. Top plate; 1212. Front cover plate; 1213. Second side plate; 122. Shielding component; 13. Support arm; 20. Lens module; 21. Extrusion protrusion; 30. Transmitting circuit 40. Receiving circuit board; 50. CNC board; 50a. High-speed signal area; 60. Support sheet metal part; 70. Power board; 80. Metal shielding part; 90. First conductive adhesive strip; 91. Second conductive adhesive strip; 92. Rotating mirror base; 93. Conductive part; 94. Interface connector; 95. Interface flexible board; 951. Main body; 952. Branch part; 96. Receiving flexible board; 97. Transmitting flexible board; 98. First laser engraving part; 99. Second laser engraving part; 100. Honeycomb structure; 100a. Honeycomb hole. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0034] Where the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended embodiments.

[0035] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] Please see Figure 1 and Figure 2 This application provides a LiDAR (Light Detection and Ranging) 1, including a housing 10, a transmitting circuit board 30, a receiving circuit board 40, and a lens module 20. The lens module 20, the transmitting circuit board 30, and the receiving circuit board 40 are all disposed within the housing 10. The transmitting circuit board 30 is pressed onto the lens module 20 to emit laser light through the lens module 20. The receiving circuit board 40 is pressed onto the lens module 20 and spaced apart from the transmitting circuit board 30 to receive echo light through the lens module 20. The receiving circuit board 40 is used to detect reflected light and convert it into an electrical signal.

[0038] The lens module 20 is a key optical component in the lidar 1 used for focusing and directional emission of laser pulses. It is responsible for focusing and directionally emitting the laser pulses generated by the transmitting circuit board 30 to achieve precise illumination of the target object. At the same time, the lens module 20 is also responsible for collecting the laser pulses reflected back from the target object and focusing these reflected lights onto the receiving circuit board 40 for signal detection and processing. In other words, the lens module 20, the transmitting circuit board 30, and the receiving circuit board 40 work together to enable the lidar 1 to achieve high-precision distance measurement and speed detection.

[0039] Understandably, the housing 10 is the external protective structure of the lidar 1, which can protect the transmitting circuit board 30, receiving circuit board 40, and lens module 20 installed inside the housing 10 from environmental factors such as impact, dust, and moisture, provide support for the internal structure, and also play an electromagnetic shielding role, reducing the impact of external electromagnetic interference on the internal transmitting circuit board 30 and receiving circuit board 40.

[0040] The housing 10 is generally shaped like a cuboid and has good dustproof and waterproof performance. The housing 10 includes a base 11 and an upper cover 12 covering the base 11. The base 11 and the upper cover 12 are spliced ​​together along the vertical direction of the lidar 1 to form the housing 10. The base 11 and the upper cover 12 can be fastened together by screws.

[0041] Please continue reading. Figure 1 and Figure 2 A waterproof protrusion 113 is provided on the side of the base 11 facing the upper cover 12. The waterproof ring can improve the sealing of the connection between the base 11 and the upper cover 12 and prevent external liquid from entering the interior of the housing 10. Understandably, the waterproof protrusion 113 can also be provided on the upper cover 12. In order to further enhance the strength of the connection between the upper cover 12 and the base 11, the lidar 1 also includes a second conductive adhesive strip 91. The second conductive adhesive strip 91 is provided at the connection between the base 11 and the upper cover 12. Specifically, it can be arranged along the extension direction of the waterproof protrusion 113. The second conductive adhesive strip 91 is sandwiched between the base 11 and the upper cover 12, which can enhance the adhesion at the connection between the base 11 and the upper cover 12, making the connection between the two more secure. Furthermore, the second conductive strip 91 can also ensure good electrical continuity between the top cover 12 and the base 11, bridging the tiny gap between the top cover 12 and the base 11, thus ensuring electrical continuity between the top cover 12 and the base 11, and forming a continuous shielding layer between the top cover 12 and the base 11, thereby preventing electromagnetic wave leakage and external interference intrusion.

[0042] Please see Figure 2 and Figure 3Specifically, the base 11 includes a base plate 111 and a surrounding plate 112 connected to the edge of the base plate 111. The surrounding plate 112 is specifically a back plate 1121 and two oppositely arranged first side plates 1122 connected to the base plate 111 and the back plate 1121. The top cover 12 includes a cover body 121, which includes a top plate 1211, a front cover plate 1212 and two oppositely arranged second side plates 1213 connected to the top plate 1211 and the front cover plate 1212. The front cover plate 1212 is detachably connected to the top plate 1211 and the two second side plates 1213. The top plate 1211 and the base plate 111 are arranged opposite each other in the vertical direction of the lidar 1, while the front cover plate 1212 and the back plate 1121 are arranged opposite each other in the front-back direction of the lidar 1. The first side plate 1122 and the second side plate 1213 are both triangular in shape. The lens module 20 is located on the base plate 111, while the transmitting circuit board 30 and the receiving circuit board 40 are arranged roughly parallel to the back plate 1121, making the internal structure of the lidar 1 more compact.

[0043] Understandably, in other embodiments, the housing 10 may also be in other shapes such as cylinder, hemisphere, cone, etc., and the shapes of the base 11 and the top cover 12 may also be set according to actual needs, which is not limited in this application.

[0044] Since the transmitting circuit board 30 involves rapidly changing current and voltage during operation, these rapidly changing current and voltage can generate electromagnetic fields at the circuit's wires, components, and interfaces. These electromagnetic fields may propagate to nearby electronic components, causing electromagnetic interference. Therefore, the transmitting circuit board 30 is the main noise source. On the other hand, the receiving circuit board 40 needs to receive the reflected laser signals, which are very weak. Any external electromagnetic interference may affect the strength and accuracy of the received signal. Therefore, the receiving circuit board 40 is the sensitive source.

[0045] To resolve the above issues, please refer to [link / reference needed]. Figure 3 The lidar 1 also includes a metal shield 80, which is disposed within the housing 10 and pressed against the side of the transmitting circuit board 30 facing away from the lens module 20, thereby clamping the transmitting circuit board 30 between the metal shield 80 and the lens module 20. The metal shield 80 can absorb or emit electromagnetic fields generated by the transmitting circuit board 30, preventing these electromagnetic fields from propagating to the receiving circuit board 40 or other electronic components, and reducing electromagnetic interference generated by the transmitting circuit board 30.

[0046] The metal shield 80 is also pressed onto the side of the receiving circuit board 40 away from the lens module 20, so as to sandwich the receiving circuit board 40 between the metal shield 80 and the lens module 20. Since the metal shield 80 is provided, the interference of external electromagnetic fields on the receiving circuit board 40 can be reduced, thereby protecting the integrity of the received signal of the receiving circuit board 40.

[0047] The metal shield 80 can also serve as a heat dissipation component, helping the transmitting circuit board 30 and the receiving circuit board 40 to quickly dissipate heat and improve the thermal stability of the lidar 1.

[0048] The metal shielding component 80 can be a sheet metal shielding component, which is easy to process and has good conductivity, effectively shielding electromagnetic interference. To enhance the connection strength of the metal shielding component 80, conductive adhesive can also be used, providing not only mechanical fixation but also electrical connection.

[0049] In this embodiment, the other side of the metal shield 80 pressed against the receiving circuit board 40 abuts against the back plate 1121, and the lens module 20 is provided with a pressing protrusion 21 on the side facing the receiving circuit board 40. The pressing protrusion 21 passes through the receiving circuit board 40 and the metal shield 80 in sequence, so that the receiving circuit board 40 and the metal shield 80 are both pressed tightly between the lens module 20 and the back plate 1121, reducing displacement or damage caused by vibration or impact.

[0050] Please continue reading. Figure 3 The housing 10 also includes a support arm 13, which is connected to the base plate 111 and the back plate 1121 and extends in a direction away from the back plate 1121. The support arm 13 has an abutment plane, which abuts against the side of the metal shield 80 corresponding to the transmitting circuit board 30 away from the transmitting circuit board 30. The lens module 20 can press the transmitting circuit board 30 and the metal shield 80 pressed against the transmitting circuit board 30 against the support arm 13. The support arm 13 can provide additional support and improve the positional stability of the transmitting circuit board 30 and the corresponding metal shield 80.

[0051] Please continue reading. Figure 3 Furthermore, the lidar 1 also includes a control board 50, a supporting sheet metal part 60, and a power board 70. The control board 50 is disposed within the housing 10, specifically located on the side of the base 11 near the back plate 1121, and is electrically connected to both the transmitting circuit board 30 and the receiving circuit board 40. The control board 50 is the data processing center of the lidar 1, responsible for receiving data from the receiving circuit board 40, processing and analyzing this data to determine the position, speed, and other information of the target object. The control board 50 can also control the timing and mode of laser pulse emission from the transmitting circuit board 30. The supporting sheet metal part 60 is disposed on the side of the control board 50 away from the base 11, while the power board 70 is disposed on the side of the supporting sheet metal part 60 away from the control board 50. Understandably, the power board 70, the supporting sheet metal part 60, and the control board 50 are stacked sequentially in the vertical direction. The supporting sheet metal part 60 provides support for the power board 70, ensuring the stable installation of the power board 70. Furthermore, the power board 70 is electrically connected to the CNC board 50, and the power board 70 can provide the necessary power to the lidar 1.

[0052] Both the CNC board 50 and the power board 70 are grounded through a supporting sheet metal part 60. This part 60 is made of metal, possessing good conductivity and low resistivity, allowing free electrons to move freely. When a potential difference exists, these free electrons move to form a current, thus achieving grounding. This allows the current to easily pass through the supporting sheet metal part 60, forming a low-impedance path. This path effectively conducts and dissipates internally generated electromagnetic interference (EMI). Because EMI encounters low resistance during conduction, it is more easily guided to the ground. Therefore, when the CNC board 50 and the power board 70 are grounded through the supporting sheet metal part 60, it means they are electrically connected to a common reference point, providing a low-impedance path that allows internally generated EMI to be safely conducted to the reference point, thereby reducing the equipment's external electromagnetic radiation. If left untreated, EMI will radiate into the surrounding environment as electromagnetic waves, potentially interfering with the normal operation of other electronic devices. Effective grounding design guides this interference to the ground, preventing it from radiating and affecting the surrounding environment.

[0053] Furthermore, the supporting sheet metal part 60 can also be used as a shield. The CNC board 50, as the control and data processing center, also transmits data and distributes power with other circuit boards. Without proper shielding, the CNC board 50 will be affected by electromagnetic interference from other circuit boards, or the CNC board 50 will interfere with other circuit boards. Similarly, the power supply board 70 is responsible for providing stable power. Without proper shielding, the power supply board 70 will also be affected by electromagnetic interference from other circuit boards, affecting the stability of the power transmission, or the power supply board 70 will interfere with other circuit boards. Therefore, the supporting sheet metal part 60 isolates the CNC board 50 from the power supply board 70, reducing direct electromagnetic coupling between the CNC board 50 and the power supply board 70.

[0054] like Figure 4 As shown, in some embodiments, the lidar 1 further includes a first conductive adhesive strip 90, which is sandwiched between the CNC board 50 and the base 11, and continuously or intermittently surrounds the outer periphery of the electronic components on the CNC board 50. This provides flexibility in arranging the first conductive adhesive strip 90, allowing for optimization of its layout according to specific needs and space constraints. After curing, the first conductive adhesive strip 90 provides additional fixing, making the connection between the CNC board 50 and the base 11 more secure and reducing relative displacement between the CNC board 50 and the base 11 caused by vibration or impact.

[0055] The first conductive adhesive strip 90 improves the electrical connection between the CNC board 50 and the base 11, providing a grounding path for the electronic components on the CNC board 50, which helps stabilize the circuit's operating potential and reduces static electricity buildup. Furthermore, the first conductive adhesive strip 90 provides additional shielding, reducing the impact of electromagnetic interference generated by the CNC board 50 on the external environment, and also reducing the impact of external interference on the sensitive electronic components on the CNC board 50.

[0056] Please continue reading. Figure 4 Specifically, the CNC board 50 includes a high-speed signal area 50a, which refers to the circuit board portion that processes high-speed signals. The high-speed signal area 50a includes a Gigabit Ethernet circuit, a Field Programmable Gate Array (FPGA) circuit, and a Double Data Rate (DDR) circuit. The Gigabit Ethernet circuit enables high-speed network data transmission, the FPGA circuit is used to implement complex digital signal processing and data conversion functions, and the DDR circuit connects the processor and memory, providing fast data access. The supporting sheet metal part 60 is located on the side of the high-speed signal area 50a away from the base 11. Because the high-speed signal area 50a has high requirements for signal integrity, any interference may cause signal distortion. The shielding provided by the first conductive adhesive strip 90 and the supporting sheet metal part 60 protects signal integrity and ensures correct transmission of high-speed signals. The supporting sheet metal part 60 also helps dissipate heat from the high-speed signal area 50a, reducing the heat generated and maintaining the operating temperature of the electronic components within a reasonable range.

[0057] Please see Figure 5 and Figure 6 The lidar 1 also includes an interface connector 94, which is disposed in the housing 10 and is used to establish an electrical connection with external devices. The first conductive adhesive strip 90 can also achieve electrical isolation between the interface connector 94 and the high-speed signal area 50a, reducing electromagnetic interference that may be generated during high-speed signal transmission.

[0058] Please continue reading. Figure 5 and Figure 5Specifically, the base 11 or the top cover 12 has a connection opening 11b. In this embodiment, the connection opening 11b is located on the back plate 1121 of the base 11. In other embodiments, the specific location of the connection opening 11b can be set according to the actual situation. The interface connector 94 passes through the connection opening 11b and is used to connect external power supply and communication equipment. The lidar 1 also includes an interface flexible plate 95, which includes a main body 951 and a branch 952 connected to each other. The main body 951 electrically connects the interface connector 94 to the power board 70, ensuring the stability of power and signal transmission between the lidar 1 and external equipment. The branch 952 is grounded through the supporting sheet metal 60. The supporting sheet metal 60 serves as a good conductive medium, directly grounding the branch 952 to enhance grounding performance. On the one hand, good grounding can provide a low-impedance path. The grounding of the branch 952 forms a shielding effect. When external noise attempts to enter the interior through the interface flexible plate 95, it will be short-circuited by the grounding path, thereby reducing the amount of noise entering the internal circuit. On the other hand, various noises, including high-frequency noise, are generated when the circuit is operating. If these noises do not have an effective path to the ground, they may be emitted through the interface flexible board 95, creating electromagnetic interference. By grounding the branch 952, these noises can be effectively guided to the ground, thereby reducing the noise emitted outward through the interface flexible board 95.

[0059] Please see Figure 7 In some embodiments, the lidar 1 further includes a flexible receiving plate 96 electrically connecting the control board 50 and the receiving circuit board 40. The flexible receiving plate 96 is spaced apart from the interface flexible plate 95. The flexible receiving plate 96 is used to establish an electrical connection between the control board 50 (typically responsible for signal processing and control) and the receiving circuit board 40 (responsible for receiving and processing reflected light signals detected by the lidar 1). This allows signals to be transmitted between the control board 50 and the receiving circuit board 40. The flexible receiving plate 96 is flexible and can be bent and adjusted according to the internal space and the specific positions of the control board 50 and the receiving circuit board 40, which makes the circuit layout more flexible in designing a compact lidar 1 system.

[0060] Please continue reading. Figure 7The upper cover 12 includes a cover body 121 and a shielding member 122. The cover body 121 covers the base 11, and the shielding member 122 is connected to the cover body 121 and protrudes towards the base 11, specifically towards the bottom plate 111. The shielding member 122 is located between the interface flexible plate 95 and the receiving flexible plate 96. After the upper cover 12 is installed on the base 11, the shielding member 122 can separate the interface flexible plate 95 and the receiving flexible plate 96, that is, isolate the interface flexible plate 95 and the receiving flexible plate 96. Since the interface flexible plate 95 and the receiving flexible plate 96 are close to each other, the current change on one object may induce a current on the other object, that is, generate near-field coupling. By setting the shielding member 122, the electromagnetic interference between the two can be reduced, which helps to maintain the quality and integrity of the signal and prevent signal crosstalk between the interface flexible plate 95 and the receiving flexible plate 96.

[0061] Because there are high-speed communication signals and clock signal traces between the CNC board 50 and the receiving flexible board 96, and the clock signal traces are specifically designed and arranged on the receiving flexible board 96 to transmit synchronous clock signals between the CNC board 50 and the receiving circuit board 40, and because these signals are high-speed, signal reflection will occur due to the mismatch between the characteristic impedance of the receiving flexible board 96 and the output impedance of the CNC board 50. Therefore, impedance matching on the CNC board 50 is very important. Impedance matching ensures that the signal will not be reflected, attenuated, or distorted during transmission due to impedance mismatch, thereby maintaining signal integrity.

[0062] In this embodiment, an impedance-type filter is used for source-end attenuation to achieve impedance matching. An impedance-type filter uses resistive elements to reduce or eliminate signals of a specific frequency. The impedance-type filter is connected in series with the clock signal trace to meet impedance matching requirements and also reduces signal reflection on the transmission line through source-end attenuation. Source-end attenuation helps control the signal amplitude and reduces overshoot and undershoot caused by reflection. Through these measures, the integrity of the clock signal is guaranteed because interference and distortion experienced by the signal during transmission are minimized, thereby maintaining signal stability and accuracy. Clock signals typically contain high-frequency components, which may generate harmonic noise. The emission of these harmonic noises can be effectively suppressed, reducing interference to other circuits.

[0063] Specifically, impedance-type filters can be ferrite beads. Ferrite beads present high impedance to high-frequency signals and low impedance to low-frequency signals. This means they can provide impedance matching in the high-frequency range while allowing low-frequency signals to pass through. Ferrite beads can suppress high-frequency noise because they convert the energy of high-frequency signals into heat, thereby reducing noise components in the signal. When placing ferrite beads close to the port of interface connector 94, the length of signal traces can be reduced, and signals can be filtered earlier before entering the main circuit, improving filtering efficiency.

[0064] In other embodiments, the impedance filter is not limited to ferrite beads, but can also be an inductor, capacitor, etc., and this application does not limit it.

[0065] like Figure 3 and Figure 8 As shown, in some embodiments, the lidar 1 further includes a flexible emitting plate 97 and a first laser-engraved component 98. The first laser-engraved component 98 electrically connects the flexible emitting plate 97 to the lens module 20. The first laser-engraved component 98 provides an indirect grounding path for the flexible emitting plate 97 through the housing 10 of the lens module 20. This indirect grounding design allows for greater flexibility in the structural layout within the housing 10. A portion of the lens module 20 is directly connected to the base plate 111 of the base 11. The first laser-engraved component 98 reduces displacement or damage to the flexible emitting plate 97 caused by external impacts and provides a grounding path for the circuitry on the flexible emitting plate 97, helping to stabilize the operating potential of the flexible emitting plate 97. It also helps the shielding box conduct electromagnetic interference from the flexible emitting plate 97, reducing its impact on other circuits.

[0066] Please continue reading. Figure 3 and Figure 8 In some embodiments, the lidar 1 may further include a second laser-engraved element 99, which electrically connects the receiving flexible plate 96 to the surrounding plate 112. The second laser-engraved element 99 can fix the position of the receiving flexible plate 96, reducing displacement caused by vibration or impact. The second laser-engraved element 99 provides a grounding path for the circuits on the receiving flexible plate 96, helping to stabilize the operating potential of the receiving flexible plate 96. The second laser-engraved element 99 can also serve as a shielding layer, reducing electromagnetic interference to the circuits on the receiving flexible plate 96 and improving electromagnetic compatibility.

[0067] like Figure 7 and Figure 8As shown, in some embodiments, the inner bottom surface of the base 11 has a mounting groove 11a. The lidar 1 also includes a rotating mirror mount 92 and a rotating mirror. The rotating mirror is mounted on the rotating mirror mount 92 and is positioned opposite to the lens module 20. The rotating mirror can rotate, changing the emission or reception direction of the laser beam, enabling the lidar 1 to scan a wider range without moving the entire lidar 1 device. The rotating mirror mount 92 is positioned in the mounting groove 11a, simplifying the assembly process because it provides a clear positioning and fixing mechanism, making the installation of the rotating mirror mount 92 faster and more accurate. It also improves the structural stability and rigidity of the rotating mirror mount 92 connected to the base 11.

[0068] The lidar 1 also includes an electronic control board, which is mounted on the rotating mirror mount 92 and is used to drive and control the movement of the rotating mirror. If there is a large gap between the rotating mirror mount 92 and the base 11, these gaps may act as antennas, amplifying the electromagnetic waves generated by the electronic control board. This amplification effect may lead to electromagnetic interference (EMI) problems, i.e., resonance with electromagnetic waves at a specific frequency, which amplifies the electromagnetic interference at that frequency, affecting the performance of the lidar 1, and may even interfere with other electronic devices. In this embodiment, at least a portion of the rotating mirror mount 92 is embedded in the mounting groove 11a to reduce the gap between the rotating mirror mount 92 and the inner bottom surface of the base 11. Therefore, by tightly fitting the rotating mirror mount 92 and the base 11 and reducing the gap, the radiation of electromagnetic waves generated by the electronic control board can be effectively controlled, thereby improving the overall performance and reliability of the lidar 1.

[0069] like Figure 8 and Figure 9 As shown, in some embodiments, the housing 10 further includes a honeycomb structure 100 and a waterproof and breathable membrane. The honeycomb structure 100 may be located on the back plate 1121. The honeycomb structure 100 has multiple honeycomb holes 100a, which communicate with the interior and exterior of the housing 10. The opening size of the honeycomb holes 100a is small, causing scattering when sound waves encounter the honeycomb structure. The sound waves are decomposed into multiple wavelets as they pass through the honeycomb holes 100a, and these wavelets propagate in different directions, resulting in the dispersion of the original sound wave's energy. Therefore, the design of the honeycomb structure 100 can effectively suppress near-field noise leakage.

[0070] The honeycomb pores 100a have a diameter of less than 5mm, which can block or reduce the propagation of high-frequency noise. A waterproof and breathable membrane is placed on the honeycomb structure 100. The membrane is breathable but waterproof, protecting the internal electronic components from moisture damage.

[0071] like Figure 5 , Figure 7 and Figure 10As shown, in some embodiments, along the vertical direction of the lidar 1, there is a first gap 10a between the bottom of the lens module 20 and the CNC plate 50, and a second gap 10b between the top of the lens module 20 and the top cover 12. The lidar 1 also includes a plurality of conductive elements 93 disposed within the first gap 10a and / or the second gap 10b to form a shielding cavity within the first gap 10a and / or the second gap 10b. This can reduce the risk of electromagnetic interference leaking out through the first gap 10a and the second gap 10b, and help to construct a shielding cavity. This shielding cavity can effectively block the electromagnetic interference generated inside from radiating outward, and also block external interference from entering the interior.

[0072] The conductive components 93 include at least one of the following: laser-engraved parts, conductive adhesive, conductive foam, conductive springs, conductive copper foil, conductive aluminum foil, and conductive graphite. All of these conductive components 93 are conductive, a fundamental property enabling their use in electromagnetic shielding. They also possess a certain degree of flexibility or plasticity to adapt to the shape and size of the first gap 10a and / or the second gap 10b. In practical applications, laser-engraved parts are often used in the first gap 10a, while conductive foam or conductive adhesive is often used in the second gap 10b. Since the first gap 10a is located between the lens module 20 and the CNC plate 50, the space is relatively small, and the laser-engraved parts can be customized according to the specific shape and size of the first gap 10a to provide precise shielding. The conductive foam has good elasticity and compressibility, providing stable contact between the top cover 12 and the top of the lens module 20. The conductive adhesive, before solidification, is usually liquid or paste-like, possessing a certain degree of fluidity, and can effectively fill the tiny gaps and uneven surfaces between the top cover 12 and the lens module 20.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A lidar, characterized in that, include: case; The lens module is disposed within the housing; Both the transmitting circuit board and the receiving circuit board are disposed within the housing. The transmitting circuit board is pressed against the lens module to emit laser light through the lens module. The receiving circuit board is pressed against the lens module and spaced apart from the transmitting circuit board to receive echo light through the lens module. The CNC board is disposed inside the housing and is electrically connected to both the transmitting circuit board and the receiving circuit board; Support sheet metal parts are mounted on the CNC plate; as well as A power supply board is disposed on the side of the supporting sheet metal part away from the CNC board and is electrically connected to the CNC board; Both the CNC board and the power board are grounded through the supporting sheet metal parts.

2. The lidar according to claim 1, characterized in that, Also includes: A metal shield is disposed within the housing and pressed against the side of the transmitting circuit board and / or the receiving circuit board away from the lens module, so as to sandwich the transmitting circuit board and / or the receiving circuit board between the metal shield and the lens module.

3. The lidar according to claim 1, characterized in that, The housing includes a base and a top cover disposed on the base, the CNC board is mounted on the base, and the lidar further includes: The first conductive adhesive strip is sandwiched between the CNC board and the base, and continuously or intermittently surrounds the outer periphery of the electronic components on the CNC board.

4. The lidar according to claim 3, characterized in that, The CNC board includes a high-speed signal area, the first conductive adhesive strip is disposed around the outer periphery of the high-speed signal area, and the supporting sheet metal part is disposed on the side of the high-speed signal area away from the base.

5. The lidar according to claim 3, characterized in that, Also includes: The second conductive adhesive strip is disposed at the connection between the base and the top cover, and is sandwiched between the base and the top cover.

6. The lidar according to claim 3, characterized in that, The inner bottom surface of the base has a mounting groove, and the lidar also includes: A rotating mirror mount, at least partially embedded in the mounting groove, to reduce the gap between the rotating mirror mount and the inner bottom surface of the base; and A rotating mirror is mounted on the rotating mirror mount and is positioned opposite to the lens module.

7. The lidar according to claim 3, characterized in that, A first gap exists between the bottom of the lens module and the CNC board, and a second gap exists between the top of the lens module and the upper cover. The lidar also includes: Multiple conductive elements are disposed within the first gap and / or the second gap to form a shielding cavity within the first gap and / or the second gap; The conductive component includes at least one of the following: laser-engraved component, conductive adhesive, conductive foam, conductive spring, conductive copper foil, conductive aluminum foil, and conductive graphite.

8. The lidar according to claim 3, characterized in that, The base or the top cover has a connection opening, and the lidar further includes: An interface connector, passing through the connection opening; and The interface flexible board includes a main body and branch sections that are interconnected. The main body electrically connects the interface connector to the power board, and the branch sections are grounded through the supporting sheet metal parts.

9. The lidar according to claim 8, characterized in that, The lidar further includes a flexible receiving plate electrically connecting the CNC board and the receiving circuit board, and the upper cover includes: The cover body, which is disposed on the base; and A shielding member is connected to the cover body, protrudes towards the base, and is located between the interface flexible plate and the receiving flexible plate.

10. The lidar according to claim 9, characterized in that, The receiving flexible board has clock signal traces, and a ferrite bead is connected in series in the clock signal traces.

11. The lidar according to claim 9, characterized in that, The base includes a base plate and a surrounding plate connected to the edge of the base plate. The lidar also includes: Launching flexible plates; The first laser-engraved component electrically connects the emitting flexible plate to the lens module, and the lens module is electrically connected to the base plate; and / or The second laser-engraved component electrically connects the receiving flexible plate to the surrounding plate.

12. The lidar according to any one of claims 1-11, characterized in that, The housing includes: A honeycomb structure with multiple honeycomb cells; and A waterproof and breathable membrane is applied over the honeycomb structure.

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