A pointing mirror assembly and its bonding tool

Abstract

The application discloses a pointing mirror assembly and a bonding tool thereof, and relates to the technical field of space laser communication. The pointing mirror adopts a back convex cylindrical structure form, improves the rigidity of the bonding part of the mirror body, improves the anti-deformation capability, and provides sufficient operation space for the tool at the back. The flexible joint is locally bonded with the mirror body, and a force releasing lever is formed from the bonding point to the inner flexible groove root, so that the shrinkage deformation of the glue layer is released, the bonding stress is reduced, and the bonding stress caused by the continuous bonding of the whole circumference of the outer cylindrical surface is avoided. In addition, the circumferential material of the bonding point is continuous, the bonding surface cylindricity and local rigidity are easy to control, the uniformity of the glue layer is easy to guarantee, and the pointing mirror position stability under vibration is stable. The external interfaces are far away from each other, and the unevenness influence is weakened. By selecting appropriate bonding layer thickness adhesive and using the tool plug, the two bonding parts do not need to be precisely machined and matched. After bonding, the assembly precision and consistency are high, the subsequent whole machine adjustment is facilitated, and the space environment working condition requirements are met.

Description

Technical Field

[0001] This application relates to the field of space laser communication technology, and in particular to a pointing mirror assembly and its bonding fixture. Background Technology

[0002] The positional and surface accuracy of the pointing mirror assembly in a laser communication terminal directly affects the quality of the optical system, and consequently, the communication quality and tracking spot quality. Positional misalignment can sometimes even cause the cross-axis point to shift, making stable tracking and communication impossible and leading to mission failure. The pointing mirror body is typically installed on the terminal product by bonding it to structural components. Improper control of bonding stress during this process can easily cause the mirror surface to exceed tolerances. Simultaneously, the pointing mirror assembly must withstand the mechanical vibrations of rocket launches, as well as the microgravity, temperature variations, and unevenness caused by the space environment during installation. Therefore, high demands are placed on the pointing mirror's support structure. Furthermore, with the increasing demand for laser communication terminals, mass production of components has become crucial and essential. Therefore, a pointing mirror support structure is urgently needed that can guarantee the surface accuracy and positional accuracy of the mirror before and after bonding and under various operating conditions, while also simplifying the bonding process.

[0003] The existing patent, titled "A Single-Point Support Flexible Joint for a Small-Aperture Reflector of a Space Optical Remote Sensor," with patent application number 201010607345.5, includes a support mandrel body and its radial unloading groove, circumferential unloading groove, adhesive plate, and hollow tool. It relies on the unloading grooves in two directions to absorb the deformation energy generated during the curing process of the adhesive layer, protecting the surface accuracy of the reflector. However, the radial unloading groove causes discontinuity in the circumferential material of the adhesive plate, making it difficult to control the cylindricity of the adhesive plate during actual processing, and consequently, the uniformity of the adhesive layer thickness. Furthermore, the rigidity of the adhesive plate is weak at its furthest point from the root, leading to a shift in the pointing mirror position and a change in the through-axis point under coupling factors before and after vibration testing. Simultaneously, its flexible structure, bonded to the inner surface of the mirror body via the outer surface, requires hollowing out the center of the mirror body to accommodate the flexible joint, weakening the mirror's rigidity and making it difficult to adapt to various working conditions. Furthermore, the screw holes are too close together. When connecting the components to the main unit after gluing, the short span causes unevenness to affect magnification, easily leading to deviations in the mirror surface shape and requiring re-fine-tuning of the mirror, a cumbersome process. If the flexible joint is installed on the main unit first and then the mirror body is glued, the operating space is limited, making operation difficult.

[0004] The existing patent, titled "A Flexible Support Structure for a Space Camera Mirror" (patent application number CN201910525190.1), includes a coaxially arranged flexible mirror mount and a flexible adapter. The inner ring surface of the flexible joint is fixedly connected to the outer cylindrical surface of the cylindrical boss on the back of the mirror. Through staggered flexible grooves, it reduces the deformation of the mirror under gravity, environmental temperature changes, and unevenness of the mounting surface. However, it only considers the resistance to external environmental influences after component bonding, neglecting the surface stability of the mirror body before and after bonding. The flexible joint is bonded to the mirror body using a two-component optical epoxy resin adhesive, resulting in a thin adhesive layer. Precision machining of the mounting cylindrical surface and the inner cylindrical surface of the flexible mirror mount is required, making the rework process cumbersome and increasing the risk of mirror impact. Furthermore, the adhesive has a high elastic modulus and lacks a stress release path, typically requiring further surface finishing after bonding. Summary of the Invention

[0005] Based on this, this application provides a pointing mirror assembly to solve the problem of profile degradation after pointing mirror bonding, while also meeting various working conditions. This application also provides a bonding fixture for the pointing mirror assembly to facilitate the bonding process.

[0006] This application provides a pointing mirror assembly, including a pointing mirror. The pointing mirror includes a mirror body, one side of which is a mirror surface. A mounting post is located at the center of the other side of the mirror body. The mounting post has an outer cylindrical surface. The pointing mirror assembly also includes a flexible joint, which includes:

[0007] The body has an annular inner surface, on which at least three sets of adhesive structures are provided. Each set of adhesive structures includes at least one adhesive protrusion that is higher than the inner surface. The adhesive protrusion has a flexible adhesive surface away from the inner surface. An adhesive layer is provided on the flexible adhesive surface and the adhesive layer is connected to the outer cylindrical surface.

[0008] The body has at least three inner flexible grooves, which are located close to the inner surface. A flexible thin-walled structure is formed between the inner surface and the sidewall of the inner flexible groove. Furthermore, along the radial direction of the body, a group of adhesive structures overlaps with the projection of one inner flexible groove, and there is a certain distance between the two ends of the arc groove of the inner flexible groove and the adhesive structure, so that a cantilever unloading lever is formed from the adhesive structure to the two ends of the arc groove of the inner flexible groove.

[0009] At least one external interface is disposed on the outer surface of the flexible joint.

[0010] Optionally, at least three positioning grooves are provided on the inner surface, and at least one set of adhesive structures are provided between two adjacent positioning grooves, and the bottom surface of the positioning groove is the positioning surface of the flexible side plug.

[0011] Optionally, the thickness of the adhesive layer is 0.08~0.12mm.

[0012] Optionally, the adhesive layer is an epoxy resin adhesive layer.

[0013] Optionally, on the side of the inner flexible groove facing away from the inner surface, the body has at least three outer flexible grooves, the inner flexible grooves and the outer flexible grooves are alternately arranged, and along the radial direction of the body, the projections of the inner flexible grooves and the projections of the outer flexible grooves do not overlap or at least partially overlap.

[0014] Optionally, three sets of the adhesive structures are uniformly disposed on the inner surface; and / or,

[0015] Each set of adhesive structures is uniformly provided with two adhesive protrusions; and / or

[0016] Three positioning grooves are evenly disposed on the inner surface; and / or

[0017] The body is uniformly provided with three inner flexible grooves; and / or,

[0018] The body is uniformly provided with three outer flexible grooves; and / or,

[0019] The flexible joint includes two outer interfaces, which are symmetrically connected to the outer surface of the flexible joint.

[0020] Accordingly, this application also provides an adhesive fixture for mounting the aforementioned pointing mirror assembly, the adhesive fixture comprising:

[0021] A base plate, wherein a directional mirror bearing surface is provided in the middle of the base plate, and at least one flexible bearing surface is provided near the edge of the base plate; wherein, the directional mirror bearing surface is used to place the mirror body of the directional mirror, and the outer contour of the directional mirror bearing surface is the same as the outer contour of the mirror body, for positioning the directional mirror; the flexible bearing surface is used to place the outer interface, and cooperates with the shoulder screw to position the flexible joint.

[0022] Optionally, at least one fixing part is provided near the edge of the base plate, and the fixing part has a fixing groove; the bonding fixture includes a fixing block, the fixing block has a fixing protrusion, the fixing protrusion is engaged with the fixing groove so that the fixing block abuts against the lens body.

[0023] Optionally, the bonding fixture includes a plug block, the plug block being provided with at least three positioning posts, each positioning post having an inner positioning surface and an outer positioning surface; the positioning posts are inserted into the positioning groove, the inner positioning surface is in contact with the outer cylindrical surface of the pointing mirror, and the outer positioning surface is in contact with the flexible side plug positioning surface of the positioning groove.

[0024] Optionally, the bonding fixture includes a pressure block disposed on the side of the plug away from the base plate.

[0025] Compared with the prior art, the technical solution provided in this application has the following advantages:

[0026] The pointing mirror assembly provided in this application directly enhances the rigidity of the mirror body's bonding joints and the overall mirror body by increasing the center thickness of the mounting post, thereby improving the pointing mirror's ability to resist deformation under various working conditions during the bonding process and in the operating environment. Secondly, by setting a bonding structure with a local boss shape on the inner surface of the flexible joint and bonding it to the mounting post, a cantilever stress-relieving lever is formed from the bonding point on the bonding structure to both ends of the arc groove of the inner flexible groove, i.e., the root of the inner flexible groove. This releases the deformation caused by the curing shrinkage of the adhesive layer, reduces the impact of adhesive stress on the mirror body, and ensures the stability of the mirror surface shape before and after bonding, avoiding the stress that would result from continuous bonding of the outer cylindrical surface and the inner surface. Furthermore, the continuous material at the bonding point in the circumferential direction reduces processing difficulty, makes it easier to control the cylindricity of the bonding surface, and thus makes it easier to control the uniformity of the adhesive layer thickness and the rigidity of the bonding point, which helps ensure the positional stability of the pointing mirror under vibration conditions. The mounting post's outward-convex cylindrical structure on the back of the mirror body facilitates the arrangement of bonding fixtures, making the bonding process more convenient. Simultaneously, the external screw interfaces are spaced apart, and the flexible groove on the outside reduces the impact of unevenness during component installation, resulting in a more stable surface profile during installation. Using an adhesive with an appropriate layer thickness, such as EC2216 epoxy resin adhesive (0.1±0.02 mm), provides relatively loose tolerances that can be easily guaranteed through machining, eliminating the need for precision machining of the two bonded parts and reducing complex processes.

[0027] The bonding fixture for the pointing mirror assembly provided in this application uses a pointing mirror bearing surface to support the mirror surface of the pointing mirror and a flexible joint bearing surface to support the outer interface of the flexible joint. The outer contour of the pointing mirror bearing surface is the same as the outer contour of the mirror body. The flexible joint bearing surface and the outer interface are positioned with shoulder screws to ensure quick and accurate positioning of the relative position of the pointing mirror and the flexible joint. The clamping block fixation prevents circumferential displacement during bonding. By using the bonding fixture, the bonding process is simplified, and it is easier to control the uniformity of the adhesive layer thickness, thereby improving bonding efficiency and pass rate, and saving installation time. At the same time, by controlling the parallelism and height difference dimensional accuracy of the two bearing surfaces of the bonding fixture, the bonded pointing mirror assembly can be directly used for the installation of the whole machine, reducing the amount of adjustment during the installation process and even eliminating the need for further adjustments. Attached Figure Description

[0028] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0029] Figure 1A schematic diagram of the structure of the pointing mirror assembly provided in this application;

[0030] Figure 2 This is a schematic diagram of the structure of the pointing mirror in the pointing mirror assembly provided in this application;

[0031] Figure 3 A schematic diagram of the structure of the pointing mirror assembly provided in this application at another angle;

[0032] Figure 4 A schematic diagram of the flexible joint in the pointing mirror assembly provided in this application;

[0033] Figure 5 for Figure 4 A magnified view of a portion of region A in the middle;

[0034] Figure 6 A schematic diagram of the bonding fixture for the pointing mirror assembly provided in this application;

[0035] Figure 7 A schematic diagram of the structure of the bonding fixture for positioning the pointing mirror assembly provided in this application;

[0036] Figure 8 A schematic diagram of the structure of the base plate in the bonding fixture for the pointing mirror assembly provided in this application;

[0037] Figure 9 A schematic diagram of the plug block in the bonding fixture for the pointing mirror assembly provided in this application;

[0038] Figure 10 A schematic diagram showing the installation state of the pointing mirror assembly provided in this application mounted on a coarse pointing surface;

[0039] Figure 11 A schematic diagram of the structure of a pointing mirror assembly with other three-point mounting configurations provided in this application.

[0040] Explanation of reference numerals in the attached figures:

[0041] 100. Pointing mirror assembly;

[0042] 200, Pointing mirror; 210, Mirror body; 211, Mirror surface; 220, Mounting post; 221, Outer cylindrical surface;

[0043] 300. Flexibility;

[0044] 310. Body; 311. Inner surface; 312. Outer surface;

[0045] 320. Adhesive structure; 321. Adhesive protrusion; 322. Flexible adhesive surface;

[0046] 330. Positioning groove; 331. Positioning surface of flexible joint side plug;

[0047] 340, Adhesive layer; 350, Inner flexible groove; 360, Outer interface; 370, Outer flexible groove; 380, Shoulder screw;

[0048] 400. Bonding fixtures;

[0049] 410. Base plate; 411. Pointing mirror bearing surface; 412. Flexible joint bearing surface; 413. Fixing part; 414. Fixing groove;

[0050] 420. Fixing block; 421. Fixing protrusion;

[0051] 430. Plug; 431. Locating pin; 432. Inner locating surface; 433. Outer locating surface;

[0052] 440. Pressed block;

[0053] 500. Grooving;

[0054] 600. Outer ring fixing bracket;

[0055] 700, coarse pointing mounting component. Detailed Implementation

[0056] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0057] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , Figure 1 A schematic diagram of the structure of the pointing mirror assembly provided in this application; Figure 2 This is a schematic diagram of the structure of the pointing mirror in the pointing mirror assembly provided in this application; Figure 3 A schematic diagram of the structure of the pointing mirror assembly provided in this application at another angle; Figure 4 A schematic diagram of the flexible joint in the pointing mirror assembly provided in this application; Figure 5 for Figure 4 A magnified view of a portion of region A in the middle.

[0058] This application provides a pointing mirror assembly 100, including a pointing mirror 200 and a flexible joint 300. The pointing mirror 200 includes a mirror body 210 and a mounting post 220. One side of the mirror body 210 is a mirror surface 211, and the mounting post 220 is located at the center of the other side of the mirror body 210. The mounting post 220 has an outer cylindrical surface 221. The flexible joint 300 includes a body 310 and at least one outer interface 360. The body 310 has an annular inner surface 311. At least three sets of adhesive structures 320 are provided on the inner surface 311. Each set of adhesive structures 320 includes at least one adhesive protrusion 321 that is higher than the inner surface 311. The adhesive protrusion 321 has a flexible joint adhesive surface 322 that is away from the inner surface 311. An adhesive layer 340 is provided on the flexible joint adhesive surface 322 and is connected to the outer cylindrical surface 221. The body 310 has at least three inner flexible grooves 35. 0. The inner flexible groove 350 is set close to the inner surface 311, and a flexible thin-walled structure is formed between the inner surface 311 and the sidewall of the inner flexible groove 350. Along the radial direction of the body 310, the projection of a set of adhesive structures 320 overlaps with the projection of an inner flexible groove 350, and there is a certain distance between the two ends of the arc groove of the inner flexible groove 350 and the adhesive structure, so that the adhesive structure 320 and the two ends of the arc groove of the inner flexible groove 350 form a cantilever unloading lever. The outer interface 360 ​​is set on the outer surface 312 of the flexible joint 300.

[0059] In this embodiment, one side of the mirror body 210 is a mirror surface 211, which is a plane and mainly provides light reflection. The other side of the mirror body 210 has a mounting post 220 at its center. The mounting post 220 serves as the central support structure of the mirror body 210, and its central rigidity is crucial. Therefore, the outer cylindrical surface 221 of this application increases the central thickness of the mirror body 210 within the same axial dimension of the component, thereby improving the rigidity of the mirror body 210 itself. This helps the pointing mirror 200 maintain surface stability after bonding and enhances its ability to resist deformation under various working conditions.

[0060] In addition, the pointing mirror 200 can also be provided with reinforcing diagonal ribs from the center outwards, so as to improve the rigidity of the mirror body 210 while ensuring a certain degree of lightweighting.

[0061] Based on this, the flexible bonding surface 322 of the flexible joint 300 is connected to the outer cylindrical surface 221 of the mounting post 220 through an adhesive layer 340 to satisfy the surface shape retention capability of the mirror surface 211 of the pointing mirror 200 under working conditions such as gravity, temperature and unevenness of the mounting surface.

[0062] It should be noted that, in this application, the two ends of the arcuate groove of the inner flexible groove 350 also refer to the root of the inner flexible groove 350, which, viewed from the axial direction of the body 310, corresponds to the groove wall of the arcuate groove at both ends of the inner flexible groove 350. Along the radial direction of the body 310, the projection of a set of adhesive structures 320 overlaps with the projection of an inner flexible groove 350. Preferably, the projection of a set of adhesive structures 320 is located in the middle part of the projection of an inner flexible groove 350, thereby enabling cantilevered stress-relieving levers to be formed on both sides of the adhesive structures 320 for stress relief. Furthermore, the thickness of the thin-walled structure will vary depending on the size of the flexible joint 300; for example, the thickness of the thin-walled structure is approximately 1 mm.

[0063] Specifically, since the adhesive protrusion 321 is positioned above the inner surface 311, and the flexible joint adhesive surface 322 is located at the end of the adhesive protrusion 321 furthest from the inner surface 311, the connection between the flexible joint adhesive surface 322 and the outer cylindrical surface 221 via the adhesive layer 340 effectively forms a multi-segment surface connection between the flexible joint 300 and the mounting post 220, with a certain gap between each segment connection. At the gap positions, there is a certain gap between the inner surface 311 of the flexible joint 300 and the outer cylindrical surface 221 of the mounting post 220, and the size of the gap is equal to the thickness of the adhesive layer 340.

[0064] Meanwhile, since the projection of an inner flexible groove 350 overlaps with that of a set of adhesive structures 320 along the radial direction of the body 310, and the inner flexible groove 350 is positioned close to the inner surface 311, a flexible thin-walled structure is formed between the inner flexible groove 350 and the inner surface 311. The adhesive stress generated by the adhesive layer 340 is transmitted to the thin wall through the flexible joint adhesive surface 322, causing the thin wall to deform. The adhesive stress is then released through the cantilever stress relief lever, thereby avoiding the deterioration of the surface shape after the guide mirror 200 and the flexible joint 300 are bonded.

[0065] In some embodiments, at least three positioning grooves 330 are provided on the inner surface 311, and at least one set of adhesive structures 320 are provided between two adjacent positioning grooves 330. The bottom surface of the positioning groove 330 is a flexible side plug positioning surface 331, which is used to fit with the outer positioning surface 433 of the plug 430 in the adhesive tooling 400 to limit the positioning post 431 of the plug 430 in the positioning groove 330.

[0066] Specifically, the plug 430, acting as a rigid positioning component, after being inserted into the positioning groove 330, cooperates with the flexible joint side plug positioning surface 331 to limit the distance between each flexible joint bonding surface 322 and the outer cylindrical surface 221 of the mounting post 220. This ensures that the adhesive layer 340 has a consistent thickness throughout, avoiding differences in curing shrinkage rates caused by uneven thickness of the adhesive layer 340, further reducing local shrinkage stress concentration, and minimizing the impact of stress on the surface shape of the mirror body 210 from the source. Secondly, the uniform thickness of the adhesive layer 340 allows it to form uniform bonding strength after curing, avoiding bonding failure due to excessively thin adhesive layers or internal defects caused by excessively thick adhesive layers 340. Thus, this application, through a stable adhesive layer 340 thickness combined with a multi-segment bonding structure, allows bonding stress to be transmitted more evenly to the thin wall between the inner flexible groove 350 and the inner surface 311, ensuring the effectiveness of the stress release path.

[0067] In some embodiments, the thickness of the adhesive layer 340 is 0.08~0.12 mm.

[0068] Specifically, the thickness of the adhesive layer 340 can be any one of 0.08, 0.09, 0.1, 0.11, or 0.12 mm, or any value in between. Thus, the thickness of the adhesive layer 340 between the inner surface 311 and the outer cylindrical surface 221 is 0.08~0.12 mm. This ensures that the adhesive layer 340 uniformly covers the flexible joint bonding surface 322, avoiding bonding failure due to insufficient adhesive, while also preventing problems such as excessive curing shrinkage and numerous internal defects caused by an excessively thick adhesive layer 340. Furthermore, at this thickness, the adhesive layer 340 has stable strength after curing, and the shrinkage stress is within a controllable range. Combined with the flexible structure of the flexible joint 300 (the flexible thin wall between the inner flexible groove 350 and the inner surface 311), it can more smoothly transmit and release bonding stress, preventing deterioration of the mirror body 210 surface shape.

[0069] Secondly, the unbonded portion forms a gap with the same thickness as the adhesive layer 340, which eliminates the need for vehicle matching processing when installing the guide mirror 200 and the flexible joint 300. This reduces machining steps, saves time and labor costs in the vehicle matching process, reduces assembly risks caused by processing errors, makes the assembly process more convenient, and significantly improves production efficiency.

[0070] In addition, the fixed adhesive layer 340 thickness standardizes the gap of the unbonded part (consistent with the adhesive layer 340 thickness), providing stable spatial conditions for the deformation and stress release of the flexible joint 300 thin-walled structure, further avoiding gap fluctuations caused by vehicle matching errors, ensuring the stable function of structures such as multi-section bonding and internal flexible grooves, and guaranteeing the surface shape retention and stiffness performance of the guide mirror assembly 100.

[0071] In some embodiments, the adhesive layer 340 is an epoxy resin adhesive layer.

[0072] Specifically, the epoxy resin adhesive layer is a high-strength structural adhesive. After curing, it exhibits high bonding strength and good toughness, firmly connecting the flexible bonding surface 322 to the outer cylindrical surface 221 of the mounting post 220. This stable bonding strength provides support for the overall rigidity of the pointing mirror assembly 100, preventing structural loosening or surface deformation due to bonding failure during use, thus meeting the rigidity requirements of the pointing mirror assembly 100.

[0073] Secondly, the epoxy resin adhesive itself has a low curing shrinkage rate, which can reduce the bonding stress caused by the shrinkage of the adhesive layer 340 from the source. The adhesive layer 340 formed, together with the flexible groove and thin-walled structure of the flexible joint 300, can release residual stress more efficiently and further avoid stress transmission to the mirror body 210, which would lead to a deterioration of the surface shape.

[0074] In addition, the elastic modulus, bonding strength and other mechanical parameters of epoxy resin adhesive are well defined. The optimal bonding area can be determined by theoretical calculation, thereby avoiding the problems of stress accumulation due to excessive bonding area and insufficient bonding due to insufficient bonding area. This achieves a precise match between the bonding structure 320 and mechanical requirements and improves the reliability of the design.

[0075] Meanwhile, epoxy resin adhesive exhibits excellent environmental stability, including temperature and moisture resistance, making it suitable for applications like the directional mirror 200 under conditions of temperature fluctuations. Furthermore, the cured adhesive layer 340 maintains stable performance and will not experience adhesive degradation due to environmental changes, ensuring the module's shape retention during long-term use.

[0076] Finally, to meet the thickness requirement of adhesive layer 340, adhesive layer 340 can be either EC2216 epoxy resin or Milburn epoxy resin, or other epoxy resin adhesives that meet the above-mentioned functions. EC2216 epoxy resin or Milburn epoxy resin has moderate application fluidity, which facilitates uniform application to form adhesive layer 340 at a thickness of 0.08~0.12mm, avoiding insufficient or excessive adhesive.

[0077] In some embodiments, on the side of the inner flexible groove 350 facing away from the inner surface 311, the body 310 has at least three outer flexible grooves 370. The inner flexible groove 350 and the outer flexible grooves 370 are alternately arranged, and along the radial direction of the body 310, the projections of the inner flexible groove 350 and the projections of the outer flexible grooves 370 do not overlap or at least partially overlap.

[0078] Specifically, the outer flexible groove 370 is mainly used to resist the external environment. The overlap depends on the overall stiffness of the pointing mirror assembly and the temperature and unevenness conditions. The alternating layout of the inner flexible groove 350 and the outer flexible groove 370 forms a multi-level flexible buffer structure. Compared with a single flexible groove, it can more fully absorb the deformation caused by the curing shrinkage of the adhesive layer 340, temperature fluctuations, and unevenness of the mounting surface. It can dissipate stress from different sources in stages and prevent stress from being directly transmitted to the mirror body 210 and affecting the surface shape. At the same time, along the radial direction of the body 310, the projections of the inner flexible groove 350 and the outer flexible groove 370 do not overlap or at least partially overlap, realizing the interval distribution of flexible and rigid sections. This avoids the local stiffness weakness caused by the concentration of the inner flexible groove 350 and the outer flexible groove 370, and maintains the overall load-bearing capacity of the flexible joint 300. Without increasing the structural volume, it balances the requirements of flexible deformation and rigid load-bearing.

[0079] In some embodiments, three sets of adhesive structures 320 are uniformly disposed on the inner surface 311; and / or, each set of adhesive structures 320 is uniformly disposed with two adhesive protrusions 321; and / or, three positioning grooves 330 are uniformly disposed on the inner surface 311; and / or, three inner flexible grooves 350 are uniformly provided on the body 310; and / or, three outer flexible grooves 370 are uniformly provided on the body 310; and / or, the flexible joint 300 includes two outer interfaces 360, which are symmetrically connected to the outer surface 312 of the flexible joint 300.

[0080] Specifically, three sets of adhesive structures 320 are provided on the inner surface 311 and are evenly distributed along the circumference of the inner surface 311, so that the adhesive stress and positioning support force of the adhesive layer 340 are evenly transmitted along the outer cylindrical surface 221 of the mounting column 220 and then evenly released through the thin wall, avoiding local stress concentration and overload.

[0081] Each set of adhesive structures 320 includes two adhesive protrusions 321, which are evenly distributed to increase the number of flexible adhesive surfaces 322. For example, when two sets of adhesive structures 320 are provided on the inner surface 311, and each set of adhesive structures 320 includes two adhesive protrusions 321, there are a total of four flexible adhesive surfaces 322. When three sets of adhesive structures 320 are provided on the inner surface 311, and each set of adhesive structures 320 includes two adhesive protrusions 321, there are a total of six flexible adhesive surfaces 322, and so on. The appropriate number can be selected according to the specific dimensions of the outer cylindrical surface 221 and the inner surface 311.

[0082] Three positioning grooves 330 are provided on the inner surface 311 and are evenly distributed along the circumference of the inner surface 311. When three sets of adhesive structures 320 are provided on the inner surface 311, the adhesive structures 320 and the positioning grooves 330 are alternately arranged. Any set of adhesive structures 320 is positioned by the positioning grooves 330 on the left and right sides to ensure the thickness of the adhesive layer 340.

[0083] Correspondingly, the body 310 has three inner flexible grooves 350 evenly spaced, and each inner flexible groove 350 corresponds to a set of adhesive structures 320. A thin wall is formed between each inner flexible groove 350 and the inner surface 311 to release the adhesive stress of the corresponding adhesive layer 340.

[0084] Similarly, the body 310 has three outer flexible grooves 370 evenly distributed. Along the axial direction, each outer flexible groove 370 is disposed between two inner flexible grooves 350, and along the radial direction, the projections of the inner flexible grooves 350 and the outer flexible grooves 370 do not overlap or at least partially overlap.

[0085] The two outer interfaces are symmetrically arranged at 360 degrees to ensure that the load-bearing capacity of the directional mirror assembly 100 is balanced when it is installed externally, thus avoiding tilting or surface deformation of the mirror body 210 caused by uneven installation.

[0086] As a preferred embodiment, three sets of adhesive structures 320 are provided on the inner surface 311, each set of adhesive structures 320 includes two adhesive protrusions 321, three positioning grooves 330 are provided on the inner surface 311, the body 310 has three inner flexible grooves 350 and three outer flexible grooves 370, and the flexible joint 300 includes two outer interfaces 360, which are symmetrically connected to the outer surface 312 of the flexible joint 300, thereby avoiding local concentration and achieving the best stress release effect to maintain the surface shape of the mirror body 210.

[0087] In summary, the pointing mirror assembly 100 provided in this application, by setting the mounting post 220 to thicken the center thickness of the mirror body 210, directly improves the rigidity of the bonding joint of the mirror body 210 and the overall rigidity of the mirror body 210, thereby enhancing the pointing mirror 200's ability to resist deformation under various working conditions. Secondly, since the bonding protrusion 321 is set higher than the inner surface 311, and the flexible bonding surface 322 is located at the end of the bonding protrusion 321 away from the inner surface 311, the flexible bonding surface 322, through the connection of the adhesive layer 340 and the outer cylindrical surface 221, forms a multi-segmented surface connection between the flexible joint 300 and the mounting post 220, avoiding stress concentration caused by the continuous bonding of the outer cylindrical surface 221 and the inner surface 311 around the entire circumference. At the same time, along the radial direction of the body 310, the projection of the inner flexible groove 350 overlaps with that of the bonding structure 320, forming a thin-walled structure between the inner flexible groove 350 and the inner surface 311 of the flexible joint 300. When the adhesive layer 340 cures and shrinks, the adhesive stress generated by the bonding surface 322 pushes the thin-walled structure to deform, and then the bonding stress is directly released through the inner flexible groove 350, so as to avoid the stress from accumulating at the mirror body 210 and causing the surface shape to deteriorate.

[0088] Furthermore, by bonding a locally protruding adhesive structure 320 to the mounting post 220 on the inner surface of the flexible joint 300, and extending from the bonding point on the adhesive structure 320 (the bonding point in this text does not refer to a single point, but rather the surface connection formed by the connection between the aforementioned flexible joint adhesive surface 322 and the outer cylindrical surface 221 through the adhesive layer 340) to both ends of the arc groove of the inner flexible groove 350, i.e., the root of the inner flexible groove 350, a cantilever stress relief lever is formed to release the deformation caused by the curing shrinkage of the adhesive layer 340, reduce the influence of adhesive stress on the mirror body 210, and ensure the stability of the mirror surface 211 before and after bonding, avoiding the lack of release of adhesive stress caused by the continuous bonding of the outer cylindrical surface 221 and the inner surface 311 around the entire circumference. In addition, the continuous bonding point in the circumferential material reduces the processing difficulty, makes it easier to control the cylindricity of the bonding surface, and thus makes it easier to control the thickness uniformity of the adhesive layer 340 and the stiffness of the bonding point, which helps to ensure the positional stability of the pointing mirror under vibration conditions. The mounting post 220, with its outwardly convex cylindrical structure on the back of the mirror body 210, facilitates the arrangement of bonding fixtures, making the bonding process more convenient. Simultaneously, the external screw interfaces are kept separate, and the outer flexible groove 370 reduces the impact of unevenness during the installation of the pointing mirror assembly, resulting in a more stable surface profile during installation. Using an adhesive with an appropriate adhesive layer thickness 340, such as EC2216 epoxy resin, with an adhesive layer thickness of 0.1±0.02 mm, provides relatively loose tolerances that can be easily guaranteed through machining. This eliminates the need for additional precision machining of the pointing mirror 200 and the flexible joint 300, reducing complex processes.

[0089] Please refer to the following: Figure 6 , Figure 7 and Figure 8 , Figure 6 A schematic diagram of the bonding fixture for the pointing mirror assembly provided in this application; Figure 7 A schematic diagram of the structure of the bonding fixture for positioning the pointing mirror assembly provided in this application; Figure 8 A schematic diagram of the structure of the base plate in the bonding fixture for the pointing mirror assembly provided in this application.

[0090] Accordingly, this application also provides an adhesive fixture 400 for a pointing mirror assembly, used to install the pointing mirror assembly 100. The adhesive fixture 400 includes: a base plate 410, a pointing mirror bearing surface 411 provided in the middle of the base plate 410, and at least one flexible bearing surface 412 provided near the edge of the base plate 410; wherein, the pointing mirror bearing surface 411 is used to place the mirror body 210 of the pointing mirror 200, and the outer contour of the pointing mirror bearing surface 411 is the same as the outer contour of the mirror body 210; the flexible bearing surface 412 is used to place the outer interface 360 ​​and to cooperate with the shoulder screw 380 to position the flexible joint 300.

[0091] Specifically, the guide mirror bearing surface 411 is mainly used to support the mirror surface 211 of the guide mirror 200. A piece of paper needs to be placed between the mirror surface 211 and the guide mirror bearing surface 411 to prevent scratching the mirror surface 211. In this embodiment, the paper needs to have a small thickness, for example, about 0.01 mm. The paper can be oil paper or other paper that can provide protection. The outer contour of the guide mirror bearing surface 411 is the same as the outer contour of the guide mirror 200 to facilitate the positioning of the guide mirror 200. In addition, lines can be drawn on the mounting post 220 and the body 310 of the flexible joint 300 of the guide mirror 200 for quick and accurate positioning between the two, avoiding circumferential offset during bonding.

[0092] The flexible joint bearing surface 412 is used to support the outer interface 360 ​​of the flexible joint 300. Due to the requirements of the application scenario of the flexible joint 300, the outer interface 360 ​​and the mirror surface 211 need to have a certain degree of parallelism and height difference. Therefore, the base plate 410 can be machined to ensure a certain degree of parallelism and height difference dimensional accuracy between the pointing mirror bearing surface 411 and the flexible joint bearing surface 412. Parallelism includes two cases: the pointing mirror bearing surface 411 and the flexible joint bearing surface 412 are parallel but not coplanar, and the pointing mirror bearing surface 411 and the flexible joint bearing surface 412 are coplanar.

[0093] The flexible joint bearing surface 412 can be fixed to the outer interface 360 ​​by a shoulder screw 380. The shoulder screw 380 is used to position the flexible joint 300 and ensure the relative positional relationship between the pointer mirror 200 and the flexible joint 300. Furthermore, the shoulder screw 380 is not tightened to avoid generating additional stress on the flexible joint 300, which would affect the surface shape of the pointer mirror 200 after bonding.

[0094] Please see Figure 8 In some embodiments, at least one fixing part 413 is provided near the edge of the base plate 410, and the fixing part 413 has a fixing groove 414; the bonding fixture 400 includes a fixing block 420, the fixing block 420 has a fixing protrusion 421, the fixing protrusion 421 is engaged with the fixing groove 414 so that the fixing block 420 abuts against the mirror body 210.

[0095] Specifically, the fixing part 413 is used to support the fixing block 420. The height of the fixing part 413 needs to be lower than or equal to the height of the pointing mirror support surface 411 to ensure the installation of the pointing mirror 200. The bonding fixture base plate 410 can be made of magnetic martensitic stainless steel such as 2Cr13°, and magnets are set on the fixing protrusion 421 for adsorption and fixation. In this way, the fixing protrusion 421 and the fixing groove 414 are precisely matched, and the mirror body 210 is firmly fixed by the magnetic adsorption force, ensuring that the relative position of the pointing mirror 200 and the flexible joint 300 is always consistent, avoiding circumferential or axial movement of the pointing mirror 200 during the bonding and curing process, preventing the bonding accuracy from being compromised by displacement, and ensuring the surface stability of the subsequent pointing mirror assembly 100. In addition, the fixing block 420 is fixed by magnetic adsorption, eliminating the need for locking bolts, avoiding the application of clamping stress to the mirror body 210 or the flexible joint 300, and not interfering with the curing of the adhesive layer 340 and the original low-stress design of the assembly.

[0096] Preferably, the fixing block 420 can be a V-shaped block to improve the fixing effect on the mirror body 210.

[0097] In addition, the fixing block 420 is made of soft materials such as plastic, which will not scratch the surface of the mirror body 210 (especially the area around the mirror surface 211) when it comes into contact with the mirror body 210. Together with the protective paper on the mirror surface 211, it forms double protection. The soft material can also buffer the contact force during adsorption and fixing, avoiding micro-deformation of the mirror body 210 caused by hard contact, and ensuring that the core function of the pointing mirror 200 is not affected.

[0098] Please see Figure 9 , Figure 9 This is a schematic diagram of the plug structure in the bonding fixture of the pointing mirror assembly provided in this application; in some embodiments, the bonding fixture 400 includes a plug 430, the plug 430 is provided with at least three positioning posts 431, the positioning posts 431 have an inner positioning surface 432 and an outer positioning surface 433; the positioning posts 431 pass through the positioning groove 330, the inner positioning surface 432 is in contact with the outer cylindrical surface 221 of the pointing mirror 200, and the outer positioning surface 433 is in contact with the flexible side plug positioning surface 331 of the positioning groove 330.

[0099] Specifically, the outer cylindrical surface 221 and the inner positioning surface 432 are fitted with h7 / g6 or h6 / g5, and the outer positioning surface 433 and the inner surface 311 of the body 310 of the flexible joint 300 can also be fitted with h7 / g6 or h6 / g5. The inner positioning surface 432 of the positioning post 431 is attached to the outer cylindrical surface 221 of the pointing mirror 200, and the outer positioning surface 433 is attached to the positioning surface 331 of the flexible joint side plug, so that the outer cylindrical surface 221 of the mounting post 220 and the inner surface 311 of the flexible joint 300 form a fixed gap, so as to keep the thickness of the adhesive layer 340 uniform and avoid the problem of large shrinkage stress due to excessive adhesive layer 340 or bonding failure due to excessively thin adhesive layer 340. This ensures the bonding quality and stress stability from the source, and at the same time avoids circumferential displacement or radial misalignment during bonding.

[0100] Please refer to it again. Figure 6 In some embodiments, the bonding fixture 400 includes a pressure block 440, which is disposed on the side of the plug 430 away from the base plate 410, and works with the fixing block 420 to fix the mirror body 210.

[0101] Specifically, the pressure block 440 is used to compact the flexible joint 300 during the curing process after bonding, so that the mounting surface of the flexible joint 300 (the bottom surface of the outer interface 360) is tightly attached to the flexible joint bearing surface 412, ensuring that the flexible joint 300 is completely attached to the high-precision reference surface of the bonding fixture 400, and accurately transmitting the parallelism and height difference between the pointing mirror bearing surface 411 and the flexible joint bearing surface to the pointing mirror assembly 100.

[0102] Please refer to it again. Figure 6 and Figure 7 The bonding fixture 400 of this application installs the pointing mirror assembly 100 through the following steps:

[0103] Place a layer of guide paper (such as 0.01mm thick oil paper) on the guide mirror bearing surface 411. Place one side of the guide mirror 211 on the guide paper, aligning its outer contour with the guide mirror bearing surface 411. Attach the fixing block 420 to the fixing part 413, securing the guide mirror 200. Insert the plug 430 into the positioning groove 330 and insert it together into the outer cylindrical surface 221 of the guide mirror 200 for trial assembly. Use the shoulder screw 380 to position the outer interface 360. After trial assembly, apply adhesive to the flexible joint bonding surface 322, and assemble the flexible joint 300 and the plug 430 together with the outer cylindrical surface 221 of the guide mirror 200. Use the shoulder screw 380 to position and install the outer interface 360 ​​on the flexible joint bearing surface 412. Press the pressure block 440 onto the flexible joint 300 to cure the adhesive layer 340. After the adhesive layer 340 has cured, the pressure block 440, the shoulder screw 380, and the fixing block 420 are removed in sequence, and the plug 430 is taken out, resulting in the bonded pointing mirror assembly 100. In actual operation, this bonding process takes less than 5 minutes. After bonding, the surface shape is stable as measured by a Zygo interferometer, and the bonding fixture 400 can be reused.

[0104] Please see Figure 10 , Figure 10 This is a schematic diagram of the installation state of the pointing mirror assembly provided in this application, mounted on a coarse pointing surface; it should be noted that the pointing mirror assembly 100 is installed and used in... Figure 10The coarse pointing mounting component 700, as shown, places strict requirements on the axial spatial dimensions of the pointing mirror assembly 100. Furthermore, if the parallelism and spacing thickness meet certain accuracy requirements, the pointing mirror assembly 100 can be directly installed and fixed, eliminating the need for post-installation adjustment. In actual operation, the parallelism between the bottom surface of the outer interface 360 ​​and the mirror surface 211 after bonding is less than 0.02mm, allowing for direct installation without further adjustment, further saving the installation and adjustment time of the coarse pointing mechanism.

[0105] Furthermore, the Flex 300 can be designed as a three-point mounting structure, such as... Figure 11 As shown, Figure 11 This is a structural diagram of a pointer mirror assembly with other three-point mounting configurations provided in this application. It adapts to more application scenarios. A 500mm groove can also be cut to reduce the impact of installation unevenness and external temperature deformation, similarly... Figures 1-10 The two-point type shown can also incorporate this structure, where the unevenness factor has been taken into account by moving the installation point further away and combining it with a flexible structure. At the same time, an outer ring fixing bracket 600 can be set in the flexible circumference to reduce the use of axial dimensions.

[0106] In summary, the bonding fixture 400 for the pointing mirror assembly provided in this application supports the mirror surface 211 of the pointing mirror 200 through the pointing mirror bearing surface 411 and supports the outer interface 360 ​​of the flexible joint 300 through the flexible joint bearing surface 412. The outer contour of the pointing mirror bearing surface 411 is the same as the outer contour of the mirror body 210. The flexible joint bearing surface 412 is fixedly connected to the outer interface 360 ​​to ensure that the relative positional relationship between the pointing mirror 200 and the flexible joint 300 is quickly and accurately positioned, avoiding circumferential offset during bonding, improving installation efficiency, and saving installation time.

[0107] 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.

[0108] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this 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 bonding fixture for a pointing mirror assembly, used to install the pointing mirror assembly, the pointing mirror assembly including a pointing mirror (200), the pointing mirror (200) including a mirror body (210), one side of the mirror body (210) being a mirror surface (211), characterized in that, The mirror body (210) has a mounting post (220) at its center on the other side. The mounting post (220) has an outer cylindrical surface (221). The pointing mirror assembly (100) also includes a flexible joint (300). The flexible joint (300) includes a body (310). The body (310) has an annular inner surface (311). At least three positioning grooves (330) are provided on the inner surface (311). The bottom surface of the positioning grooves (330) is the positioning surface (331) of the flexible joint side plug. The bonding fixture (400) includes: A base plate (410) is provided with a directional mirror support surface (411) in the middle and at least one flexible support surface (412) near the edge of the base plate (410). The directional mirror support surface (411) is used to place the mirror body (210) of the directional mirror (200), and the outer contour of the directional mirror support surface (411) is the same as the outer contour of the mirror body (210) for positioning the directional mirror (200). The flexible support surface (412) is used to place the outer interface (360) and cooperates with the shoulder screw (380) to position the flexible section (300) in the directional mirror assembly. The outer interface (360) is provided on the outer surface (312) of the flexible section (300). The bonding fixture (400) includes a plug (430), the plug (430) is provided with at least three positioning posts (431), the positioning posts (431) have an inner positioning surface (432) and an outer positioning surface (433); the positioning posts (431) are inserted into the positioning groove (330), the inner positioning surface (432) is in contact with the outer cylindrical surface (221) of the pointing mirror (200), and the outer positioning surface (433) is in contact with the positioning surface (331) of the flexible side plug.

2. The bonding fixture for the pointing mirror assembly according to claim 1, characterized in that, At least one fixing part (413) is provided near the edge of the base plate (410), and the fixing part (413) has a fixing groove (414); the bonding fixture (400) includes a fixing block (420), the fixing block (420) has a fixing protrusion (421), the fixing protrusion (421) and the fixing groove (414) are connected to each other so that the fixing block (420) abuts against the mirror body (210).

3. The bonding fixture for the pointing mirror assembly according to claim 1, characterized in that, The bonding fixture (400) includes a pressure block (440) disposed on the side of the plug (430) away from the base plate (410).

4. A pointing mirror assembly, installed using an adhesive fixture for a pointing mirror assembly as described in any one of claims 1 to 3, characterized in that, At least three sets of adhesive structures (320) are provided on the inner surface (311). Each set of adhesive structures (320) includes at least one adhesive protrusion (321) higher than the inner surface (311). The adhesive protrusion (321) has a flexible adhesive surface (322) away from the inner surface (311). An adhesive layer (340) is provided on the flexible adhesive surface (322). The adhesive layer (340) is connected to the outer cylindrical surface (221). The body (310) has at least three inner flexible grooves (350), which are located close to the inner surface (311). The distance between the inner surface (311) and the groove wall of the inner flexible groove (350) forms a flexible thin-walled structure. Along the radial direction of the body (310), the projection of a set of adhesive structures (320) overlaps with the projection of one inner flexible groove (350), and there is a certain distance between the two ends of the arc groove of the inner flexible groove (350) and the adhesive structure (320), so that a cantilever unloading lever is formed from the adhesive structure (320) to the two ends of the arc groove of the inner flexible groove (350). On the side of the inner flexible groove (350) away from the inner surface (311), the body (310) is provided with at least three outer flexible grooves (370), and the inner flexible groove (350) and the outer flexible groove (370) are alternately arranged; The outer surface (312) of the flexible joint (300) is provided with at least one of the outer interfaces (360).

5. The pointing mirror assembly according to claim 4, characterized in that, At least one set of adhesive structures (320) is provided between two adjacent positioning grooves (330).

6. The pointing mirror assembly according to claim 4, characterized in that, The thickness of the adhesive layer (340) is 0.08~0.12mm.

7. The pointing mirror assembly according to claim 4, characterized in that, The adhesive layer (340) is an epoxy resin adhesive layer.

8. The pointing mirror assembly according to claim 5, characterized in that, Three sets of adhesive structures (320) are uniformly disposed on the inner surface (311); and / or, Each set of adhesive structures (320) is uniformly provided with two adhesive protrusions (321); and / or, Three positioning grooves (330) are evenly disposed on the inner surface (311); and / or, The body (310) has three inner flexible grooves (350) evenly spaced; and / or, The body (310) is provided with three outer flexible grooves (370) evenly spaced; and / or, The flexible joint (300) includes two outer interfaces (360), which are symmetrically connected to the outer surface (312) of the flexible joint (300).

Images