A method for adjusting a plane mirror in a light turning path

Abstract

This invention discloses a method for assembling and adjusting a plane mirror in a folding optical path, comprising the following steps: measuring the theoretical distance between the mounting end face and the intersection of the two optical axes of the folding optical path using a coordinate measuring machine; bonding and fixing the plane mirror into a mirror bracket to form a mirror component; using an autocollimating tube to emit parallel light, which is reflected by the mirror component and returns to the incident light path of the autocollimating tube; adjusting the attitude of the mirror component according to the autocollimated image formed in the autocollimating tube; calculating the cutting amount based on the coordinate measuring machine measurement results and the measured distance; performing additional machining on the mounting end face of the mirror bracket; re-measuring and calibrating after the additional machining; and fixing the mirror bracket in the additionally machined mirror component onto the mounting end face of the folding bracket. In summary, this invention significantly improves the assembly and adjustment accuracy and long-term stability of the folding optical path system, and has the advantages of consistent optomechanical coordination, high assembly and adjustment accuracy, and stable and reliable system.

Description

Technical Field

[0001] This invention belongs to the field of optical-mechanical assembly and adjustment technology of folding optical paths, specifically relating to a method for assembling and adjusting a plane mirror in a folding optical path. Background Technology

[0002] A folding optical path is a common structural form used to change the propagation direction of a light beam and optimize the optical path layout within a limited space. It is widely used in laser ranging, optical detection, spectral analysis, and precision imaging. By introducing reflective elements into the optical path, the beam can be folded while ensuring the optical path length and wavefront quality, making the optical system more compact and flexible in assembly and adjustment. The plane mirror is the core optical element in the folding optical path. It changes the propagation direction of the light by reflecting the incident light. The attitude of its reflecting surface directly affects the folding angle of the two optical axes and the imaging accuracy of the system. To ensure the reflection accuracy of the folding optical path, the plane mirror is usually installed in a mirror bracket and fixed to the system's reference position by the folding bracket to ensure the stability of the optical axis direction and the accuracy of the folding angle. It can be seen that the assembly and adjustment quality of the mirror largely determines the optical performance of the entire folding optical path system.

[0003] In existing technologies, the installation and adjustment of reflectors largely rely on manual operation or a single testing method. The accuracy of this installation and adjustment is limited by operational experience and measurement methods. Minor deviations can easily occur during processing or bonding between the mounting end face of the reflector bracket and the assembly surface of the folding bracket, making it difficult to guarantee the design accuracy of the angle between the reflector's reflecting surface and the optical axis of the folding optical path. Traditional methods typically use autocollimating light tubes to detect optical axis deviation and coordinate measuring machines to measure geometric position. However, these two methods belong to different coordinate systems, and the measurement results cannot be directly fed back to the processing stage, resulting in a disconnect between testing and processing. Errors cannot be corrected in time during the manufacturing stage, resulting in low assembly and adjustment efficiency. In addition, when machining the mirror components, the positioning accuracy of conventional fixtures is poor, and the back of the mirror support is prone to eccentricity or runout during the clamping process, causing the machined end face to not coincide with the optical axis, further amplifying the assembly and adjustment error and affecting the folding accuracy and repeatability of the system. Overall, the existing assembly and adjustment process is still in the open-loop control stage, with a lack of coordination between optical measurement and machining. The assembly and adjustment results rely on manual correction, making it difficult to meet the requirements of high-precision optical systems for attitude control and optical axis consistency.

[0004] To address the aforementioned issues, there is an urgent need to propose a method for assembling and adjusting planar mirrors in folding optical paths, fundamentally resolving the problems of calibration difficulties, unstable accuracy, and lack of closed-loop feedback control in the existing mirror assembly and adjustment process of folding optical paths. Summary of the Invention

[0005] In view of this, the present invention proposes a method for assembling and adjusting a plane mirror in a folding optical path, which is applied to the field of optomechanical assembly and adjustment technology of folding optical paths, and solves the existing technical problems of calibration difficulties, unstable accuracy and lack of closed-loop feedback control.

[0006] To achieve the above-mentioned technical objectives, the specific technical solution adopted by the present invention is as follows: A method for assembling and adjusting a plane mirror in a refracting optical path includes the following steps: S1. Measure the theoretical distance between the mounting end face of the rotating bracket that mates with the reflector bracket and the intersection point of the two optical axes of the rotating optical path using a coordinate measuring machine, and denote this theoretical distance as D; S2. Adhere and fix the plane mirror to the mirror bracket to form a mirror component. When adhere and fix the mirror component, ensure that the mounting end face of the mirror bracket is perpendicular to the folding optical path. S3. Parallel light is emitted from the autocollimating tube and reflected back into the incident light path of the autocollimating tube by the reflecting mirror component. The attitude of the reflecting mirror component is adjusted according to the autocollimated image formed in the autocollimating tube so that the reflecting mirror component and the light emitted from the autocollimating tube are autocollimated. S4. Calculate the cutting amount based on the coordinate measuring machine results and the measurement distance, and perform additional machining on the mounting end face of the reflector bracket to ensure the parallelism between the plane reflector and the mounting end face. After the additional machining, remeasure and calibrate to form a closed-loop correction between measurement and machining. S5. Fix the mirror bracket in the repaired mirror component to the mounting end face of the folding bracket, so that the angular deviation and distance deviation between the assembly position and the theoretical position of the mirror component are controlled within the allowable range. The folding bracket has lens mounting holes in two directions. The optical axis formed by the lens mounting holes is parallel to the reference plane of the folding bracket. The mounting end face of the reflector bracket is perpendicular to the angle bisector of the angle between the two optical axes. The back of the reflector bracket is provided with a stud, which is connected to an adjustable angle universal joint through the thread on the stud. The universal joint is mounted on a three-jaw chuck of a lathe, and the stud is removed after the additional machining is completed.

[0007] Furthermore, in step S3, the parallel light emitted from the autocollimating tube is reflected by the reflecting mirror component and returns to the autocollimating tube to form a cross-shaped autocollimating image. The autocollimating tube and the coordinate measuring machine work together to collect and compare the attitude data of the reflecting mirror component before and after the machining. The cutting depth and angle compensation are adjusted in real time according to the deviation, thereby realizing the coordinated correction of optical measurement and mechanical machining.

[0008] Furthermore, in step S4, the mounting end face of the reflector bracket is initially cut before cutting to eliminate runout. Then, the distance L from the surface of the plane reflector in the reflector component to the mounting end face is measured by a thickness gauge. Based on the theoretical distance D obtained in S1, the amount of additional machining S = L − D is calculated, and then fine machining is performed. The cutting accuracy is ±0.01mm. After the additional machining, the parallelism between the plane of the reflector component and the mounting end face is no greater than 0.01mm.

[0009] Furthermore, in step S2, the plane mirror is fixed to the mirror bracket by silicone rubber bonding. Before bonding, the inner wall of the bracket is cleaned and decontaminated, and the thickness of the adhesive layer is controlled by a limiting structure to reduce residual stress and maintain the stability of the bonding interface.

[0010] Furthermore, in step S5, when installing the reflector component onto the folding bracket, it is secured with screws and threadlocker is applied to the threads to prevent loosening during vibration or temperature changes.

[0011] Furthermore, in step S4, the stud on the back of the reflector bracket serves as a clamping and positioning reference, used to keep the central axis of the reflector component coincident with the axis of the lathe spindle during the turning process, thereby achieving precise coaxial positioning.

[0012] Furthermore, in step S4, the mounting end face of the reflector bracket and the mounting end face of the folding bracket are converted from optical reference to mechanical reference through machining, and dynamic calibration is achieved through measurement data feedback to reduce adhesive stress and improve assembly accuracy.

[0013] Furthermore, in step S5, the optical axis angle between the two lens mounting holes is 90° by machining the folding bracket, and the angular deviation between the assembly position of the mirror component after assembly and adjustment and the theoretical position is no greater than 1′, and the distance deviation is no greater than 0.01mm.

[0014] Furthermore, the assembly and adjustment process is achieved collaboratively by the optical measurement module, the machining module, and the data processing module. Through measurement data interaction and calibration control, the assembly and adjustment process is uniformly calibrated and corrected in real time, thereby realizing one-time high-precision assembly and adjustment of the reflector components in the folding optical path.

[0015] By adopting the above technical solution, the present invention can also bring the following beneficial effects: 1. This invention discloses a method for assembling and adjusting a planar reflector in a folding optical path. A coordinate measuring machine (CMM) is used to determine the theoretical distance between the intersection of the mounting end face of the folding support and the optical axis of the folding optical path, which mates with the reflector support. Combined with the optical reference formed by the autocollimating tube, the optical and mechanical references are unified. The CMM measurement data and the autocollimating detection results correspond in the same coordinate system, accurately reflecting the attitude error of the reflector surface. This integrates optical detection and mechanical measurement information into a unified calibration system, effectively avoiding measurement deviations caused by the separation of traditional optomechanical references. It has the advantages of consistent optomechanical calibration, high measurement accuracy, and small assembly and adjustment errors.

[0016] 2. This invention discloses a method for assembling and adjusting a plane mirror in a folding optical path. Before processing, the distance between the actual position of the plane mirror's reflecting surface and the mounting end face is measured, and the amount of additional processing is calculated based on the theoretical distance. The mounting end face is then precision-machined, and dynamic correction is performed after re-measurement, achieving real-time feedback of processing accuracy. During the additional processing, the cooperation between the stud on the back of the mirror bracket and the universal joint ensures the coaxial positioning accuracy of the mirror component on the lathe, thereby ensuring that the reflecting surface of the mirror and the optical axis of the folding optical path are strictly aligned. This effectively solves the problems of accumulated processing errors and inability to calibrate posture deviations, and has the advantages of high clamping accuracy, stable processing control, and good assembly and adjustment consistency.

[0017] 3. This invention discloses a method for assembling and adjusting a plane mirror in a folding optical path. Unified calibration is achieved through data interaction and feedback control. With the collaborative operation of an autocollimator and a coordinate measuring machine, the attitude and geometric position data of the plane mirror are collected. After processing, the data guides the final calibration of the mounting end face of the mirror support, ensuring that the assembly angle and position deviation of the mirror components on the folding support are controlled within allowable ranges. The entire assembly and adjustment process achieves dynamic integration of optical inspection, machining, and data processing, ensuring that the angular deviation of the mirror's reflecting surface is no greater than 1′ and the flatness error is no greater than 0.01mm. This guarantees the overall accuracy and long-term stability of the folding optical path system, offering advantages such as high assembly and adjustment efficiency, good optical axis consistency, and system stability and reliability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This invention provides a flowchart illustrating a method for assembling and adjusting a plane mirror in a folding optical path. Figure 2This is a schematic diagram of the folding bracket in this embodiment; Figure 3 This is a schematic diagram of the connection structure between the reflector component and the folding bracket in this embodiment; Figure 4 This is a schematic diagram of the connection structure between the reflector bracket and the stud in this embodiment; Figure 5 This is a schematic diagram of the reflector component in this embodiment; Figure 6 This is a schematic diagram of the circle drawing amount during the self-collimation detection process in this embodiment; Figure 7 This is a schematic diagram of the theoretical distance D of the folding bracket in this embodiment; In the diagram: 1. Folding bracket; 2. Lens mounting hole; 3. Mounting end face; 4. Mirror bracket; 5. Mirror component; 6. Stud; 7. Universal bracket; 8. Autocollimating tube. Detailed Implementation

[0020] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0021] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this invention, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using other structures and / or functionalities besides one or more of the aspects set forth herein.

[0023] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0024] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0025] Example 1 like Figure 1 As shown, a method for assembling and adjusting a plane mirror in a refracting optical path includes the following steps: Step S1: Establish an optical-mechanical reference and measure the theoretical distance.

[0026] The theoretical distance between the mounting end face 3 on the folding bracket 1, which mates with the mirror bracket 4, and the intersection of the two optical axes of the folding optical path is measured using a coordinate measuring machine (CMM). This theoretical distance is denoted as D. The folding bracket 1 has lens mounting holes 2 in two directions, and the optical axes of the two lens mounting holes 2 are perpendicular to each other, forming the optical reference for the folding optical path. The reference plane of the folding bracket 1 is parallel to the two optical axes and is used to determine the overall coordinate system of the optical system. Using the reference plane of the folding bracket 1 as a reference, the CMM measures the spatial coordinate relationship between the optical axis position of each mounting hole and the mounting end face 3, thereby determining the theoretical position of the optical reflection point in the folding optical path and providing a precise geometric reference for the subsequent assembly and adjustment of the mirror component 5. Figure 6 As shown, in this embodiment, the bottom surface of the folding bracket 1 is a mechanical reference surface. The perpendicularity between the mounting end face 3 of the reflector and the reference surface is controlled within 0.025mm. The mounting end face 3 is perpendicular to the angle bisector of the theoretical optical axis, and the midline angle of the angle is 90°±1′. The theoretical distance D between the intersection of the optical axis and the mounting end face 3 of the reflector is measured to be 1.54mm by a coordinate measuring machine.

[0027] Step S2: Assemble the reflector components and perform initial positioning.

[0028] A plane mirror is bonded and fixed inside the mirror bracket 4 to form the mirror component 5. When bonding and fixing the mirror component 5, ensure that the mounting end face 3 of the mirror bracket 4 is perpendicular to the optical axis of the deflected optical path. Before bonding, the inner wall of the mirror bracket 4 is cleaned and decontaminated to eliminate the influence of impurities on the bonding interface. The plane mirror is fixed using silicone rubber bonding. The thickness of the adhesive layer is controlled by a limiting structure to reduce residual stress after curing and maintain the flatness and stability of the bonding interface. In the specific implementation process, 703 silicone rubber is used as the adhesive. After application, it is allowed to cure for 24 hours to ensure full curing and stress release of the adhesive layer. After bonding, a surface is formed as shown in the image. Figure 4 The reflector component 5 shown has its reflective surface facing the direction of the refracting light beam. During the bonding process, a positioning fixture is used to keep the reflector's posture from shifting, so that the reflective surface of the reflector is parallel to the mounting end face 3, thereby achieving the initial posture positioning of the reflector component 5.

[0029] Step S3: Perform autocollimation detection and attitude adjustment.

[0030] Parallel light emitted from the self-collimating tube 8 is reflected by the reflecting mirror component 5 and returns to the incident light path of the self-collimating tube 8, such as... Figure 3 As shown, the attitude error of the reflector component 5 is determined based on the cross-shaped autocollimation image formed within the autocollimating tube 8. By adjusting the attitude of the reflector component 5, the reflected light from the reflector is made to completely overlap with the emitted light from the autocollimating tube 8, achieving autocollimation. During assembly and testing, rotating the lathe spindle causes the cross-shaped autocollimation image within the autocollimating tube 8 to form a circular trajectory on the interface. By adjusting the universal chuck, the circular arc is controlled within 0.008 mm before fixing the chuck, at which point the autocollimating optical axis aligns with the normal of the reflector. This control ensures that the optical axis deviation is within a correctable range, providing a reliable attitude reference for subsequent rework. The autocollimating tube 8 works in conjunction with a coordinate measuring machine (CMM) to collect attitude data and spatial geometric position data of the reflector surface after the reflector component 5 is bonded and before and after rework. After comparing and analyzing the data, the subsequent cutting depth and angle compensation are adjusted in real time based on the deviation, achieving coordinated correction between optical measurement and machining.

[0031] Step S4: Perform additional processing and closed-loop calibration.

[0032] The mounting end face 3 of the reflector bracket 4 is machined to ensure the parallelism between the plane reflector and the mounting end face 3. After the machining, measurement and calibration are performed again to form a closed-loop correction between measurement and machining. Specifically, the reflector component 5 is clamped on the universal joint 7 on the three-jaw chuck of the lathe. The stud 6 on the back of the reflector bracket 4 is connected to the universal joint 7 by threads to ensure the coaxial positioning of the reflector component 5 radially and axially during the turning process. Then, the mounting end face 3 of the reflector bracket 4 is initially machined to eliminate runout. The distance L from the reflecting surface of the plane reflector to the mounting end face 3 is measured by a thickness gauge. The machining allowance S = L − D is calculated based on the theoretical distance D obtained in step S1. In the machining stage, a small amount of cutting of about 0.5 mm is performed first to eliminate end face runout, so that the runout of the mounting end face 3 of the reflector bracket 4 is ≤0.01 mm. Subsequently, the distance L from the reflecting surface of the reflector to the mounting end face 3 was measured to be 1.70 mm. Based on the aforementioned D=1.54 mm, the additional machining allowance S=L−D=0.16 mm was calculated, and finishing was performed accordingly. The finishing accuracy was controlled within ±0.01 mm. After completion, the runout was measured again, requiring ≤0.01 mm. Then, the back stud 6 of the reflector bracket 4 was machined off. After the additional machining was completed, the result was as shown in the figure. Figure 5 The structure shown is as follows: After the finishing process is completed, the spatial position of the mounting end face 3 is checked again using a coordinate measuring machine, and the attitude of the reflector is re-measured using an autocollimating light tube 8. The measurement results are compared with the theoretical data to achieve a closed-loop feedback of "measurement-processing-re-measurement" and ensure that the attitude error of the reflector is dynamically corrected.

[0033] Step S5: Assembly positioning and final calibration.

[0034] The mirror bracket 4 of the repaired mirror component 5 is fixed to the mounting end face 3 of the folding bracket 1, ensuring that the angular and distance deviations between the assembly position and the theoretical position of the mirror component 5 are within the allowable range. Before final assembly, the mounting end face 3 of the folding bracket 1 and the mirror component 5 is cleaned with an alcohol-ether mixture to remove residual oil and particles. Assembly is performed using screw fastening, with 222 Loctite threadlocker applied to the threads for fixation. Figure 2 As shown in the structure, this structure can effectively prevent loosening caused by temperature changes or vibration; during the assembly process, a small attitude correction is made based on the data fed back in real time by the self-collimating light tube 8 to ensure that the angle between the two optical axes of the reflector surface and the folding optical path is stable within the range of 90°±1′.

[0035] The entire assembly and adjustment process is achieved collaboratively by an optical measurement module, a machining module, and a data processing module. The optical measurement module includes an autocollimating light tube 8 and a coordinate measuring machine (CMM) for acquiring the attitude and geometric position data of the reflector. The machining module includes a turning and finishing mechanism and a universal clamping mechanism 7 for high-precision cutting of the mounting end face 3 of the reflector bracket 4. The data processing module receives measurement data, calculates attitude deviations, and outputs correction commands to the machining module, thereby completing the unified calibration and real-time adjustment of the assembly and adjustment process. During the assembly and adjustment process, the data interaction between the CMM, thickness gauge, and autocollimating light tube 8 forms a closed-loop control, ensuring that the optical reference and mechanical reference remain consistent, and realizing dynamic attitude correction of the reflector surface and real-time compensation of the installation position.

[0036] Experimental results show that after adopting the above assembly and adjustment process, the angular deviation between the assembled position and the theoretical position of the reflector is less than 1′, and the distance deviation is less than 0.01 mm, which is consistent with the calculated results of the theoretical position. This verifies the calculation accuracy of the machining allowance S=L−D and the reliability of the control method. The reflector component 5 completed by the above steps has its reflecting surface completely aligned with the optical axis of the folding optical path, and the mounting end face 3 of the reflector bracket 4 remains parallel to the reference plane of the folding bracket 1. To verify the reliability of the assembly and adjustment, the assembled reflector component 5 was tested under multiple temperature cycles and vibration conditions. The results show that the reflector... The mirror attitude showed no significant drift, and the optical axis remained stable, indicating that the assembly and adjustment structure and process of this invention can maintain a high-precision state for a long time. This shows that the assembly and adjustment process not only achieves precise adjustment of the mirror attitude, but also significantly improves the overall stability and assembly and adjustment repeatability of the folding optical path system. In summary, this invention establishes a closed-loop control system that coordinates three-coordinate measurement, autocollimation detection, and mechanical compensation processing, thereby achieving optomechanical integrated calibration and unified optical-mechanical dual references. This significantly improves the assembly and adjustment accuracy and long-term stability of the folding optical path system, and has the advantages of consistent optomechanical coordination, high assembly and adjustment accuracy, and stable and reliable system.

[0037] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for assembling and adjusting a plane mirror in a refracting optical path, characterized in that, Includes the following steps: S1. Measure the theoretical distance between the mounting end face of the rotating bracket that mates with the reflector bracket and the intersection point of the two optical axes of the rotating optical path using a coordinate measuring machine, and denote this theoretical distance as D; S2. Adhere and fix the plane mirror to the mirror bracket to form a mirror component. When adhere and fix the mirror component, ensure that the mounting end face of the mirror bracket is perpendicular to the folding optical path. S3. Parallel light is emitted from the autocollimating tube and reflected back into the incident light path of the autocollimating tube by the reflecting mirror component. The attitude of the reflecting mirror component is adjusted according to the autocollimated image formed in the autocollimating tube so that the reflecting mirror component and the light emitted from the autocollimating tube are autocollimated. S4. Calculate the cutting amount based on the coordinate measuring machine results and the measurement distance, and perform additional machining on the mounting end face of the reflector bracket to ensure the parallelism between the plane reflector and the mounting end face. After the additional machining, remeasure and calibrate to form a closed-loop correction between measurement and machining. S5. Fix the mirror bracket in the repaired mirror component to the mounting end face of the folding bracket, so that the angular deviation and distance deviation between the assembly position and the theoretical position of the mirror component are controlled within the allowable range. The folding bracket has lens mounting holes in two directions. The optical axis formed by the lens mounting holes is parallel to the reference plane of the folding bracket. The mounting end face of the reflector bracket is perpendicular to the angle bisector of the angle between the two optical axes. The back of the reflector bracket is provided with a stud, which is connected to an adjustable angle universal joint through the thread on the stud. The universal joint is mounted on a three-jaw chuck of a lathe, and the stud is removed after the additional machining is completed.

2. The method for assembling and adjusting a plane mirror in a folding optical path according to claim 1, characterized in that: In step S3, the parallel light emitted from the autocollimating tube is reflected by the reflecting mirror component and returns to the autocollimating tube to form a cross-shaped autocollimating image. The autocollimating tube and the coordinate measuring machine work together to collect and compare the attitude data of the reflecting mirror component before and after the machining. The cutting depth and angle compensation are adjusted in real time according to the deviation, thereby realizing the coordinated correction of optical measurement and mechanical machining.

3. The method for assembling and adjusting a plane mirror in a refracting optical path according to claim 2, characterized in that: In step S4, the mounting end face of the reflector bracket is initially cut before cutting to eliminate runout. Then, the distance L from the surface of the plane reflector in the reflector component to the mounting end face is measured by a thickness gauge. Based on the theoretical distance D obtained in S1, the amount of additional machining S = L − D is calculated, and then fine machining is performed. The cutting accuracy is ±0.01mm. After the additional machining, the parallelism between the plane of the reflector component and the mounting end face is no greater than 0.01mm.

4. The method for assembling and adjusting a plane mirror in a folding optical path according to claim 3, characterized in that: In step S2, the plane mirror is fixed to the mirror bracket by silicone rubber bonding. Before bonding, the inner wall of the bracket is cleaned and decontaminated, and the thickness of the adhesive layer is controlled by a limiting structure to reduce residual stress and maintain the stability of the bonding interface.

5. The method for assembling and adjusting a plane mirror in a folding optical path according to claim 4, characterized in that: In step S5, when the reflector component is installed on the folding bracket, it is secured with screws and threadlocker is applied to the threads to prevent loosening during vibration or temperature changes.

6. The method for assembling and adjusting a plane mirror in a folding optical path according to claim 5, characterized in that: In step S4, the stud on the back of the reflector bracket serves as a clamping and positioning reference, used to keep the central axis of the reflector component coincident with the axis of the lathe spindle during the turning process, thereby achieving precise coaxial positioning.

7. The method for assembling and adjusting a plane mirror in a folding optical path according to claim 6, characterized in that: In step S4, the mounting end face of the reflector bracket and the mounting end face of the folding bracket are converted from optical reference to mechanical reference through machining, and dynamic calibration is achieved through measurement data feedback to reduce adhesive stress and improve assembly accuracy.

8. The method for assembling and adjusting a plane mirror in a folding optical path according to claim 7, characterized in that: In step S5, the optical axis angle between the two lens mounting holes processed by the folding bracket is 90°, and the angular deviation between the assembly position of the mirror component after assembly and adjustment and the theoretical position is no greater than 1′, and the distance deviation is no greater than 0.01mm.

9. The method for assembling and adjusting a plane mirror in a folding optical path according to claim 8, characterized in that: The assembly and adjustment process is achieved collaboratively by the optical measurement module, the machining module, and the data processing module. Through measurement data interaction and calibration control, the assembly and adjustment process is uniformly calibrated and corrected in real time, thereby achieving one-time high-precision assembly and adjustment of the reflector component in the folding optical path.

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