Lens assembly and laser radar
By using multiple symmetrically distributed rubber strips to connect the reflector and the bracket, the problem of reflector deformation and displacement is solved, and the detection accuracy and connection reliability of the lidar are improved.
Patent Information
- Application Number
- CN202422852508.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-11-21
AI Technical Summary
In existing laser radars, the connection method between the reflector and the bracket can easily cause the reflector to deform or shift, affecting detection accuracy.
Multiple adhesive strips are used to fix the bonding surface between the reflector and the bracket. The symmetrically distributed adhesive strips are used to offset the stress caused by temperature changes and prevent the reflector from deforming and shifting.
The surface accuracy of the reflector is improved, the detection accuracy and connection reliability of the lidar are improved, and the reflector is prevented from falling off.
Smart Images
Figure CN223401091U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of laser radar technology, and in particular to a lens assembly and a laser radar using the lens assembly. Background Art
[0002] LiDAR is a high-precision measuring instrument. Its principle is to transmit a scanning beam through a transmitting module, and the receiving module receives the echo beam to obtain an echo signal. The processor obtains measurement values such as the position, speed or surface reflectivity of the target to be measured based on parameters such as the echo signal intensity or the time interval between sending and receiving the beam.
[0003] Existing LiDAR designs typically incorporate reflectors in either the receiving or transmitting optical path to deflect the laser beam. There are two common methods for connecting the reflector to the bracket: one involves applying glue to a dispensing slot on the bracket, then gluing the reflector to the bracket; the other involves a snap-fit connection. However, the former can easily cause the reflector to deform, while the latter can easily loosen, causing it to shift or fall off, thereby reducing LiDAR detection accuracy. Utility Model Content
[0004] The embodiments of the present application provide a lens assembly and a laser radar, which can prevent the reflector from shifting or falling off, reduce the deformation of the reflector, and improve the detection accuracy of the laser radar.
[0005] In a first aspect, an embodiment of the present application provides a lens assembly, comprising a bracket, a reflector and a plurality of adhesive strips; the bracket comprises a bearing surface, a first boss and a second boss, the reflector comprises a bonding surface, wherein the first boss is formed extending along a first direction at one end of the bearing surface, the second boss is formed extending along the first direction at the other end of the bearing surface, the reflector is located between the first boss and the second boss, and the bonding surface and the bearing surface are fixedly connected based on a plurality of adhesive strips.
[0006] In some embodiments, the reflector further includes a reflective surface and a plurality of side surfaces between the reflective surface and the bonding surface, the plurality of side surfaces including a first side surface and a second side surface, wherein the first side surface abuts the first boss, and the second side surface abuts the second boss. The abutment between the first side surface and the first boss, and the abutment between the second side surface and the second boss, limits the reflector to prevent displacement or falling off.
[0007] In some embodiments, the bonding surface includes a first edge, a second edge, a third edge, and a fourth edge, wherein the first edge is a common edge between the first side surface and the bonding surface, the second edge is a common edge between the second side surface and the bonding surface, the first edge is parallel to the second edge, and the third edge is parallel to the fourth edge; the multiple adhesive strips include a first adhesive strip, a second adhesive strip, a third adhesive strip, and a fourth adhesive strip, wherein the distance between the center of the first adhesive strip and the third edge is equal to the distance between the center of the first adhesive strip and the fourth edge, the distance between the center of the second adhesive strip and the third edge is equal to the distance between the center of the second adhesive strip and the fourth edge; the distance between the center of the third adhesive strip and the first edge is equal to the distance between the center of the third adhesive strip and the second edge, and the distance between the center of the fourth adhesive strip and the first edge is equal to the distance between the center of the fourth adhesive strip and the second edge. The multiple adhesive strips are symmetrically distributed so that the stress generated by temperature changes is symmetrically offset, which is beneficial to improving the surface accuracy of the reflector.
[0008] In some embodiments, the distance between the center of the first rubber strip and the first edge is equal to the distance between the center of the second rubber strip and the second edge, and the distance between the center of the third rubber strip and the third edge is equal to the distance between the center of the fourth rubber strip and the fourth edge.
[0009] In some embodiments, the bonding surface includes a first edge, a second edge, a third edge, and a fourth edge, wherein the first edge is a common edge between the first side surface and the bonding surface, the second edge is a common edge between the second side surface and the bonding surface, the first edge is parallel to the second edge, and the third edge is parallel to the fourth edge; the multiple adhesive strips include a first adhesive strip, a second adhesive strip, a third adhesive strip, and a fourth adhesive strip, wherein the distance between the center of the first adhesive strip and the third edge is equal to the distance between the center of the third adhesive strip and the fourth edge, the distance between the center of the second adhesive strip and the third edge is equal to the distance between the center of the fourth adhesive strip and the fourth edge; the distance between the center of the first adhesive strip and the first edge is equal to the distance between the center of the second adhesive strip and the second edge, and the distance between the center of the third adhesive strip and the first edge is equal to the distance between the center of the fourth adhesive strip and the second edge. The multiple adhesive strips are symmetrically distributed so that the stress generated by temperature changes is symmetrically offset, which is beneficial to improving the surface accuracy of the reflector.
[0010] In some embodiments, the distance between the center of the first rubber strip and the first edge is equal to the distance between the center of the third rubber strip and the first edge, and the distance between the center of the second rubber strip and the second edge is equal to the distance between the center of the fourth rubber strip and the second edge.
[0011] In some embodiments, the projection shapes of each of the adhesive strips in a plane perpendicular to the first direction are the same, wherein the projection shapes are circular, rectangular, diamond or elliptical.
[0012] In some embodiments, the projected areas of each of the adhesive strips in a plane perpendicular to the first direction are equal.
[0013] In some embodiments, the length of each of the adhesive strips along the first direction is equal.
[0014] In a second aspect, an embodiment of the present application also provides a laser radar, including a processor, a transceiver module and the above-mentioned lens assembly.
[0015] Based on the above embodiment, the adhesive surface of the reflector and the supporting surface of the bracket are fixedly connected using multiple adhesive strips. These adhesive strips are dispensed according to pre-set distribution locations to prevent significant local deformation of the reflector, improve the surface accuracy of the reflector, and thereby enhance the detection accuracy of the LiDAR. Furthermore, compared to a snap-on connection, the fixed connection between the reflector and the bracket using multiple adhesive strips, coupled with the formation of first and second bosses on the bracket, prevents the reflector from falling off or shifting. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.
[0017] Figure 1 A schematic structural diagram of a lens assembly provided in an embodiment of the present application;
[0018] Figure 2 A schematic structural diagram of a lens assembly provided in an embodiment of the present application;
[0019] Figure 3 A schematic diagram of the positional relationship between an adhesive surface and multiple adhesive strips provided in an embodiment of the present application;
[0020] Figure 4 A schematic diagram of the positional relationship between an adhesive surface and multiple adhesive strips provided in an embodiment of the present application;
[0021] Figure 5 A schematic diagram of the positional relationship between an adhesive surface and multiple adhesive strips provided in an embodiment of the present application;
[0022] Figure 6 A schematic diagram of the positional relationship between an adhesive surface and multiple adhesive strips provided in an embodiment of the present application;
[0023] Figure 7 This is a simulation effect diagram of the reflective mirror surface of a lens assembly provided in an embodiment of the present application during the baking and curing process;
[0024] Figure 8 This is a simulation effect diagram of the reflective mirror type of a lens component in the baking and curing process in the related art;
[0025] Figure 9 This is a simulation effect diagram of the reflective mirror type of a lens component in the baking and curing process in the related art;
[0026] Figure 10 for Figure 7 The simulation effect diagram of the reflective mirror type of the lens component at low temperature;
[0027] Figure 11 for Figure 9 Simulation effect of the reflective mirror type of the lens component at low temperature.
[0028] The accompanying drawings are marked as follows: 10, bracket; 11, bearing surface; 12, first boss; 13, second boss; 14, third boss; 20, reflector; 21, bonding surface; 211, first edge; 212, second edge; 213, third edge; 214, fourth edge; 215, fifth edge; 22, reflecting surface; 31, first rubber strip; 32, second rubber strip; 33, third rubber strip; 34, fourth rubber strip; L1, first axis; L2, second axis; L3, third axis; L4, fourth axis; L5, fifth axis; L6, sixth axis. DETAILED DESCRIPTION
[0029] In order to make the purpose, technical solutions and advantages of this application clearer, the following part will further describe the embodiments of this application in detail with reference to the accompanying drawings.
[0030] When the following description refers 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 the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application, as detailed in the appended claims.
[0031] In the related art, when assembling and fixing the reflector, the reflector is usually fixed on the bracket, and there are generally two ways to connect the reflector and the bracket: one connection method is to set a glue dispensing groove on the bracket, dispense glue in the glue dispensing groove, adhere the reflector to the bracket, and then bake to cure the glue. During the baking process, the uneven deformation of the reflector surface caused by the deformation of the glue will affect the surface accuracy of the reflector, and then affect the detection accuracy of the lidar. The other connection method is to fix the reflector and the bracket together with a buckle. This connection method only relies on the force between the buckle and the reflector to fix the reflector. Therefore, after the buckle ages or the buckle is deformed due to external impact, the reflector is prone to displacement or falling off relative to the bracket.
[0032] In order to improve the surface accuracy of the reflector and prevent relative displacement between the reflector and the bracket, an embodiment of the present application provides a lens assembly, which will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0033] In one embodiment, combined Figure 1 and Figure 2 The present embodiment provides a lens assembly 10, comprising a bracket 10, a reflector 20 and a plurality of adhesive strips. The bracket 10 comprises a bearing surface 11, a first boss 12 and a second boss 13; the reflector 20 comprises a bonding surface 21 and a reflecting surface 22; the reflecting surface 22 is used to deflect the direction of the laser beam in the transmitting light path or the receiving light path; the bonding surface 21 is parallel to the reflecting surface 22. In one example, the first boss 12 is formed extending along a first direction at one end of the bearing surface 11, and the second boss 13 is formed extending along the first direction at the other end of the bearing surface 11; the first direction is parallel to the X-axis direction, and the reflecting surface 22 is perpendicular to the X-axis. The reflector 20 is located between the first boss 12 and the second boss 13, and the bonding surface 21 and the bearing surface 11 are fixedly connected based on a plurality of adhesive strips. Since the bonding surface 21 and the bearing surface 11 are fixedly connected by a plurality of adhesive strips, the bonding strength between the reflector 20 and the bracket 10 can be effectively improved. In one example, the reflector 20 further includes multiple side surfaces located between the reflective surface 22 and the adhesive surface 21, including a first side surface and a second side surface. The first side surface abuts the first boss 12, and the second side surface abuts the second boss 13. The abutment between the first side surface and the first boss 12, and the abutment between the second side surface and the second boss 13, limits the position of the reflector 20 and prevents it from shifting or falling off.
[0034] Furthermore, due to differences in the thermal expansion coefficients of the glue, reflector 20, and bracket 10, the deformations of the three components due to temperature changes are inconsistent. The stress caused by these differences in deformation between the different components will affect the surface accuracy of reflector 20, and thus the detection accuracy of the LiDAR. To ensure the connection stability of the lens assembly and the surface accuracy of reflector 20 between -40°C and 85°C (corresponding to the operating temperature range of the LiDAR), the multiple adhesive strips must be symmetrically distributed to symmetrically offset the stresses caused by temperature changes, thereby avoiding local deformation of the bonding surface 21 or the reflecting surface 22.
[0035] In one embodiment, the reflector 20 is a rectangular plate-shaped structure, and the bonding surface 21 is rectangular, wherein the bonding surface 21 includes a first edge 211, a second edge 212, a third edge 213, and a fourth edge 214, wherein the third edge 213 is located between the first edge 211 and the second edge 212, and the fourth edge 214 is located between the first edge 211 and the second edge 212. The first edge 211 is parallel to the second edge 212, and the third edge 213 is parallel to the fourth edge 214. The first edge 211 is a common edge between the first side surface and the bonding surface 21, and the second edge 212 is a common edge between the second side surface and the bonding surface 21. In one example, as Figure 3As shown, the first axis L1 is parallel to the Y-axis, the second axis L2 is parallel to the Z-axis, and the intersection of the first axis L1 and the second axis L2 is the center of the bonding surface 21. The first edge 211 and the second edge 212 are axisymmetric about the first axis L1, and the third edge 213 and the fourth edge 214 are axisymmetric about the second axis L2. The multiple adhesive strips include a first adhesive strip 31, a second adhesive strip 32, a third adhesive strip 33, and a fourth adhesive strip 34. The preset distribution positions of the multiple adhesive strips are as follows: the first adhesive strip 31 and the second adhesive strip 32 are axisymmetric about the first axis L1, and the third adhesive strip 33 and the fourth adhesive strip 34 are axisymmetric about the second axis L2. The distance between the center of the first rubber strip 31 (the center of the projection of the first rubber strip 31 on the bonding surface 21) and the third edge 213 is equal to the distance between the center of the first rubber strip 31 and the fourth edge 214. The distance between the center of the second rubber strip 32 (the center of the projection of the second rubber strip 32 on the bonding surface 21) and the third edge 213 is equal to the distance between the center of the second rubber strip 32 and the fourth edge 214. The distance between the center of the third rubber strip 33 (the center of the projection of the third rubber strip 33 on the bonding surface 21) and the first edge 211 is equal to the distance between the center of the third rubber strip 33 and the second edge 212. The distance between the center of the fourth rubber strip 34 (the center of the projection of the fourth rubber strip 34 on the bonding surface 21) and the first edge 211 is equal to the distance between the center of the fourth rubber strip 34 and the second edge 212. In other words, the centers of the first rubber strip 31 and the second rubber strip 32 are both located on the second axis L2, and the centers of the third rubber strip 33 and the fourth rubber strip 34 are both located on the first axis L1. The distances between the center of the first adhesive strip 31 and the center of the adhesive surface 21, the distance between the center of the second adhesive strip 32 and the center of the adhesive surface 21, the distance between the center of the third adhesive strip 33 and the center of the adhesive surface 21, and the distance between the center of the fourth adhesive strip 34 and the center of the adhesive surface 21 are all equal. The multiple adhesive strips are symmetrically arranged between the adhesive surface 21 and the bearing surface 11 to symmetrically offset stresses caused by temperature changes, thereby reducing the impact of temperature changes on the surface accuracy of the reflector 20.
[0036] In another example, the bonding surface 21 is still rectangular, but compared to Figure 3 , the preset distribution positions of multiple rubber strips are different, such as Figure 4As shown, the first axis L1 is parallel to the Y-axis, the second axis L2 is parallel to the Z-axis, and the intersection of the first axis L1 and the second axis L2 is the center of the bonding surface 21. The first edge 211 and the second edge 212 are axisymmetric about the first axis L1, and the third edge 213 and the fourth edge 214 are axisymmetric about the second axis L2. The first rubber strip 31 and the second rubber strip 32 are axisymmetric about the first axis L1, the third rubber strip 33 and the fourth rubber strip 34 are axisymmetric about the first axis L1, the first rubber strip 31 and the third rubber strip 33 are axisymmetric about the second axis L2, the second rubber strip 32 and the fourth rubber strip 34 are axisymmetric about the second axis L2, and the third rubber strip 33 and the fourth rubber strip 34 are axisymmetric about the first axis L1. The distance between the center of each rubber strip and the center of the bonding surface 20 is equal. The centers of the first and second adhesive strips 31 and 32 are located on a straight line parallel to the second axis L2; the centers of the third and fourth adhesive strips 33 and 34 are located on a straight line parallel to the second axis L2; the centers of the first and third adhesive strips 31 and 33 are located on a straight line parallel to the first axis L1; the centers of the second and fourth adhesive strips 32 and 34 are located on a straight line parallel to the first axis L1. The symmetrical arrangement of the multiple adhesive strips between the bonding surface 21 and the bearing surface 11 symmetrically offsets stresses caused by temperature changes, reducing the impact of temperature changes on the surface accuracy of the reflector 20.
[0037] In one embodiment, the reflector 20 has an asymmetric structure. In one example, the bonding surface 21 further includes a fifth edge 215, wherein the first edge 211 and the second edge 212 are parallel, the third edge 213 and the fourth edge 214 are parallel, one end of the fifth edge 215 is connected to one end of the first edge 211, and the other end of the fifth edge 215 is connected to one end of the third edge 213. The angles between the fifth edge 215 and the first edge 211 and the third edge 213 are all greater than 90 degrees. The first edge 211 is a common edge between the first side surface and the bonding surface 21, and the second edge 212 is a common edge between the second side surface and the bonding surface 21. The first edge 211 is parallel to the second edge 212, and the first edge 211 is parallel to the first axis L1. The third edge 213 is parallel to the fourth edge 214, and the third edge 213 is parallel to the second axis L2. The distance d1 between the first edge 211 and the first axis L1 is equal to the distance d2 between the second edge 212 and the first axis L1. The distance d3 between the third edge 213 and the second axis L2 is equal to the distance d4 between the fourth edge 214 and the second axis L2.
[0038] In one example, continue with reference Figure 5The distance between the center of the first rubber strip 31 and the third edge 213 is equal to the distance between the center of the first rubber strip 31 and the fourth edge 214. The distance between the center of the second rubber strip 32 and the third edge 213 is equal to the distance between the center of the second rubber strip 32 and the fourth edge 214. The distance between the center of the third rubber strip 33 and the first edge 211 is equal to the distance between the center of the third rubber strip 33 and the second edge 212. The distance between the center of the fourth rubber strip 34 and the first edge 211 is equal to the distance between the center of the fourth rubber strip 34 and the second edge 212. The distance between the center of the first rubber strip 31 and the first edge 211 is equal to the distance between the center of the second rubber strip 32 and the second edge 212. The distance between the center of the third rubber strip 33 and the third edge 213 is equal to the distance between the center of the fourth rubber strip 34 and the fourth edge 214. The centers of the first rubber strip 31 and the second rubber strip 32 are both located on the second axis L2, and the centers of the third rubber strip 33 and the fourth rubber strip 34 are both located on the first axis L1. When the bonding surface 21 is asymmetrical, multiple adhesive strips are arranged between the bonding surface 21 and the supporting surface 11 according to preset distribution positions, which can symmetrically offset the stress caused by temperature changes as much as possible and reduce the impact of temperature changes on the surface accuracy of the reflector 20.
[0039] In another example, Figure 6 As shown, the third axis L3 is parallel to the fifth axis L5, the fourth axis L4 is parallel to the sixth axis L6, the distance d5 between the first edge 211 and the third axis L3 is equal to the distance d6 between the second edge 212 and the fifth axis L5, and the distance d7 between the third edge 213 and the fourth axis L4 is equal to the distance d8 between the fourth edge 214 and the sixth axis L6. The center of the first rubber strip 31 and the center of the third rubber strip 33 are located on the third axis L3, the center of the first rubber strip 31 and the center of the second rubber strip 32 are located on the fourth axis L4, the center of the second rubber strip 32 and the center of the fourth rubber strip 34 are located on the fifth axis L5, and the center of the third rubber strip 33 and the center of the fourth rubber strip 34 are located on the sixth axis L6. If the bonding surface 21 has an asymmetric shape, multiple rubber strips are arranged at predetermined distribution positions between the bonding surface 21 and the bearing surface 11. This can symmetrically offset stresses caused by temperature changes as much as possible, thereby reducing the impact of temperature changes on the surface accuracy of the reflector 20.
[0040] In some embodiments, Figures 1 to 6In any of the lens assemblies shown in the corresponding embodiments, differences in deformation of different adhesive strips during temperature changes may also affect the surface accuracy of the reflector 20. To address this issue, the dimensions of the multiple adhesive strips after curing are maintained similar or identical to prevent deformation of the different adhesive strips during temperature changes from affecting the surface accuracy of the reflector 20. In one example, the projected shape of each adhesive strip in a plane perpendicular to the first direction is similar or identical, and the projected shape is one of a circle, a rectangle, a diamond, and an ellipse. The projected area of each adhesive strip in a plane perpendicular to the first direction is similar or equal. In another example, the thickness of each adhesive strip is similar or equal, that is, the length of each adhesive strip along the first direction is the same. The thickness of the adhesive strip is between 0.1 mm and 0.3 mm. For example, the length of each adhesive strip along the first direction is a first length, and the first length can be 0.1 mm, 0.13 mm, 0.17 mm, 0.2 mm, etc. The numerical value of the first length is not specifically limited herein. By setting the sizes of multiple rubber strips, the influence of stress imbalance caused by temperature changes on the surface accuracy of the reflector 20 can be effectively reduced, thereby improving the detection accuracy of the laser radar.
[0041] In one embodiment, the size control of the multiple adhesive strips can be achieved by adjusting the dispensing amount, adjusting the dispensing position, controlling the curing temperature and / or screening different types of glue. The size control of the multiple adhesive strips can also be achieved by using a mask plate and a metal template. In one example, during the dispensing process, a metal gasket is set between the reflector 20 and the bracket 10, and a plurality of through holes are set on the metal gasket, and one through hole corresponds to the dispensing area of one adhesive strip. On the one hand, the through hole can be used to limit the flow of glue to control the shape of the adhesive strip after curing; on the other hand, the thickness of the adhesive strip after curing can be adjusted by controlling the dispensing amount and selecting the thickness of the gasket. Exemplarily, the first length is equal to the length of the metal gasket along the first direction.
[0042] In one embodiment, to quickly position the reflector 20 during assembly, the bracket 10 further includes a third boss 14 extending along a first direction on one side of the support surface 11. The multiple side surfaces of the reflector 20 further include a third side surface, which abuts the third boss 14. The third edge 213 is a common edge between the third side surface and the bonding surface 21. During assembly, the reflector 20 is pushed between the first boss 12 and the second boss 13 along the Y-axis until the third side surface of the reflector 20 abuts the third boss 14. Alternatively, the reflector 20 is pushed between the first boss 12 and the second boss 13 along the Y-axis until the gap between the third side surface of the reflector 20 and the third boss 14 is less than a predetermined distance. The predetermined distance can be set to 0.1 mm, 0.2 mm, or 0.5 mm, etc., without specific limitation. The limiting effect of the first boss 12, the second boss 13, and the third boss 14 improves the assembly efficiency of the lens assembly and prevents the reflector 20 from shifting or falling off. In one example, the third boss 14 includes two sub-bosses spaced apart along the Y-axis direction, and the second boss 12 includes two sub-bosses spaced apart along the Y-axis direction. This simplifies the processing of the bracket and reduces the overall weight of the bracket 10.
[0043] In one embodiment, to further improve the assembly accuracy of the reflector 20, the bracket 10 further includes an adjustment surface on the side opposite the bearing surface 11. The adjustment surface is provided with a fourth boss extending away from the bearing surface 11. During the assembly process or light adjustment process, the fourth boss is also used to adjust the posture of the entire lens assembly by clamping.
[0044] In one embodiment, reference Figures 7 to 11 , the lens assembly of the embodiment of the present application is described in conjunction with the simulation effect diagram of the reflective mirror type. Figure 8 The corresponding related technology is to set a circular glue dispensing groove in the center of the bearing surface, and glue the reflector to the bracket after dispensing glue in the glue dispensing groove. Figure 9 The corresponding related technology is to set a glue dispensing groove on the side of the first boss facing the first side and a glue dispensing groove on the side of the second boss facing the second side, and to glue the reflector to the bracket after dispensing glue in the two glue dispensing grooves. Figures 7 to 9 This is a simulation of the reflective mirror type in a high temperature (110 degrees Celsius) baking environment. Figures 10 and 11 The following is a simulation result of a reflective mirror in a low temperature environment (-40 degrees Celsius). In one example, the simulation result is: Figure 7 The maximum deformation of the corresponding reflective mirror type is 0.05 microns, and the minimum deformation is -0.076 microns; Figure 8 The corresponding maximum deformation of the mirror type is 0.824 microns, and the minimum deformation is -1.17 microns; Figure 9 The maximum deformation of the corresponding reflective mirror is 0.0078 microns, and the minimum deformation is -0.0207 microns. Figure 8 The corresponding lens component has the largest deformation at high temperature. Figure 10 The maximum deformation of the corresponding reflective mirror type is 4 microns, and the minimum deformation is -9.6 microns; Figure 11 The maximum deformation of the corresponding reflector surface is 13.13 microns, and the minimum deformation is -24.35 microns. Taking into account the simulation results at different temperatures, the lens assembly designed in the embodiment of the present application is conducive to improving the surface accuracy of the reflector 20, thereby improving the detection accuracy of the laser radar.
[0045] In one embodiment, the first side and the second side of the reflector 20 are bonded and fixed to further improve the connection reliability between the reflector 20 and the bracket 10. In one example, a first glue dispensing groove (not shown in the figure) is provided on the side of the first boss 12 facing the first side, and a second glue dispensing groove is provided on the side of the second boss 13 facing the second side. By dispensing glue into the first glue dispensing groove, the glue is baked and solidified, so that the first side is bonded and fixed to the first boss 12. By dispensing glue into the second glue dispensing groove, the glue is baked and solidified, so that the second side is bonded and fixed to the second boss 13, thereby improving the connection reliability between the reflector 20 and the bracket 10 and avoiding relative displacement of the reflector 20 relative to the bracket 10. In order to prevent the stress imbalance caused by temperature change in the glue in the two glue dispensing grooves from affecting the surface accuracy of the reflector 20, it is necessary to set the first glue dispensing groove and the second glue dispensing groove symmetrically, and the sizes of the first glue dispensing groove and the second glue dispensing groove are consistent. In one example, the first glue dispensing groove and the second glue dispensing groove have the same groove length along the X-axis direction, the same groove width along the Y-axis direction, the same groove depth along the Z-axis direction, and the glue dispensing amount in the first glue dispensing groove and the second glue dispensing groove is also the same.
[0046] In one embodiment, the present application provides a laser radar system comprising a processor, a transceiver module, and the lens assembly described in the above embodiments. The transceiver module comprises a transmitting module and a receiving module. The transmitting module emits a scanning beam, the receiving module receives an echo beam, and generates an echo signal. The processor determines measurement information such as the position, distance, velocity, or surface reflectivity of a target based on the echo signal intensity or the time interval between transmitting and receiving the beam.
[0047] In some embodiments, the processor is a field programmable gate array (FPGA), a system on chip (SoC), a central processing unit (CPU), a network processor (NP), a digital signal processing circuit, a micro controller unit (MCU), an application-specific integrated circuit (ASIC), or any combination thereof for implementing relevant functions.
[0048] In the description of this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the present invention. In particular, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, when a first feature is “above,” “above,” or “above” a second feature, it includes the first feature being directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is “below,” “below,” or “below” a second feature, it includes the first feature being directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.
[0049] The terms "and / or" and "and / or" used in this document describe the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. The singular forms "a" and "an" are also intended to include plural forms, unless the context clearly indicates otherwise. When the terms "comprising" and / or "including" are used in this specification, they indicate the presence of the features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof, that is, any and all combinations of one or more related listed items. The ordinal numbers such as "first" and "second" cited in the embodiments of the present application are merely identifiers and do not refer to other meanings such as a specific order or imply relative importance.
[0050] For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. The "one or more embodiments" used herein do not refer to the same embodiment, but are based on any suitable combination of specific features, structures or characteristics. The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.
Claims
1. A lens assembly, characterized in that: Including a bracket, a reflector and multiple adhesive strips; The bracket includes a bearing surface, a first boss and a second boss, and the reflector includes a bonding surface, wherein the first boss is extended along a first direction at one end of the bearing surface, and the second boss is extended along the first direction at the other end of the bearing surface, and the reflector is located between the first boss and the second boss, and the bonding surface and the bearing surface are fixedly connected based on a plurality of the rubber strips.
2. The lens assembly according to claim 1, wherein The reflector further includes a reflective surface and a plurality of side surfaces between the reflective surface and the bonding surface, wherein the plurality of side surfaces include a first side surface and a second side surface, wherein the first side surface abuts against the first boss, and the second side surface abuts against the second boss.
3. The lens assembly according to claim 2, wherein: The bonding surface includes a first edge, a second edge, a third edge, and a fourth edge, wherein the first edge is a common edge of the first side surface and the bonding surface, the second edge is a common edge of the second side surface and the bonding surface, the first edge is parallel to the second edge, and the third edge is parallel to the fourth edge; The plurality of rubber strips include a first rubber strip, a second rubber strip, a third rubber strip, and a fourth rubber strip, wherein the distance between the center of the first rubber strip and the third edge is equal to the distance between the center of the first rubber strip and the fourth edge, and the distance between the center of the second rubber strip and the third edge is equal to the distance between the center of the second rubber strip and the fourth edge; The distance between the center of the third rubber strip and the first edge is equal to the distance between the center of the third rubber strip and the second edge, and the distance between the center of the fourth rubber strip and the first edge is equal to the distance between the center of the fourth rubber strip and the second edge.
4. The lens assembly according to claim 3, wherein: The distance between the center of the first rubber strip and the first edge is equal to the distance between the center of the second rubber strip and the second edge, and the distance between the center of the third rubber strip and the third edge is equal to the distance between the center of the fourth rubber strip and the fourth edge.
5. The lens assembly according to claim 2, wherein: The bonding surface includes a first edge, a second edge, a third edge, and a fourth edge, wherein the first edge is a common edge of the first side surface and the bonding surface, the second edge is a common edge of the second side surface and the bonding surface, the first edge is parallel to the second edge, and the third edge is parallel to the fourth edge; The plurality of rubber strips include a first rubber strip, a second rubber strip, a third rubber strip, and a fourth rubber strip, wherein the distance between the center of the first rubber strip and the third edge is equal to the distance between the center of the third rubber strip and the fourth edge, and the distance between the center of the second rubber strip and the third edge is equal to the distance between the center of the fourth rubber strip and the fourth edge; The distance between the center of the first rubber strip and the first edge is equal to the distance between the center of the second rubber strip and the second edge, and the distance between the center of the third rubber strip and the first edge is equal to the distance between the center of the fourth rubber strip and the second edge.
6. The lens assembly according to claim 5, wherein: The distance between the center of the first rubber strip and the first edge is equal to the distance between the center of the third rubber strip and the first edge, and the distance between the center of the second rubber strip and the second edge is equal to the distance between the center of the fourth rubber strip and the second edge.
7. The lens assembly according to claim 1, wherein: The projection shape of each of the rubber strips in a plane perpendicular to the first direction is the same, wherein the projection shape is circular, rectangular, diamond or elliptical.
8. The lens assembly according to claim 7, wherein: The projected areas of each of the adhesive strips in a plane perpendicular to the first direction are equal.
9. The lens assembly according to claim 1, wherein: The length of each of the adhesive strips along the first direction is equal.
10. A laser radar, characterized in that: The invention comprises a processor, a transceiver module and a lens assembly as claimed in any one of claims 1 to 9.