Low stress assembly method and apparatus for a frame-sealing light engine assembly

Abstract

The application discloses a low-stress assembling method and device for a frame airtight optical machine assembly and relates to the field of precise optical element assembling, which comprises the following steps: step one, constructing a five-degree-of-freedom assembling platform, placing a bottom frame on a horizontal support table of the five-degree-of-freedom assembling platform and placing a lower cushion layer into the bottom frame; step two, adjusting the position and posture of an optical element by using a five-degree-of-freedom adjusting tool, so that the optical element is accurately placed into the bottom frame and is flexibly supported by the lower cushion layer; step three, after the installation of a frame pressing structure is completed, a fastening screw is screwed in to be initially fixed; step four, placing the frame airtight optical machine assembly which is initially fixed into a stress evaluation system to be low-stress assembled and adjusted; and step five, symmetrically disassembling top screws and in-situ glue injection are conducted until all the screws are disassembled and glued, and the frame airtight optical machine assembly assembling is completed. The five-degree-of-freedom assembling platform is designed to meet the requirements of the optical element assembling, i.e., from top to bottom assembling and precise posture adjustment.

Description

Technical Field

[0001] This invention relates to the field of precision optical component assembly. More specifically, this invention relates to a low-stress assembly method and apparatus for frame-mounted hermetically sealed optical-mechanical components. Background Technology

[0002] The assembly of a frame-sealed optomechanical assembly involves assembling all components within the frame that require positioning and limiting through corresponding positioning mechanisms. During the assembly process, it is crucial to ensure precise positioning of components (optical components here are not limited to circular or square components, and can be either optical or non-optical) under low stress. Existing technologies typically employ an integrated assembly structure, such as the infrared cold optical lens structure with an adaptive flexible support structure disclosed in CN115877533 B. This structure uses a lens support frame and M mounting positioning pins to assemble the low-temperature infrared lens. The lens support frame includes a rigid frame body and N external flexible connecting seats. This structural approach cannot guarantee that the low-temperature infrared lens is in a low-stress state during installation. Therefore, the initial assembly stress is not quantitatively assessed, a stress adjustment mechanism is lacking, and the airtightness of the entire optomechanical assembly is not considered. Thus, the above solutions cannot solve the problem of low-stress assembly of optomechanical components with airtightness requirements, and it is difficult to achieve the low-stress assembly requirements of a sealed optomechanical system. Summary of the Invention

[0003] One object of the present invention is to solve at least the above-mentioned problems and / or defects, and to provide at least the advantages described below.

[0004] To achieve these objectives and other advantages of the present invention, a low-stress assembly method for a frame-mounted hermetically sealed optomechanical assembly is provided, comprising: Step 1: Construct a five-degree-of-freedom assembly platform. Place the bottom frame of the optomechanical component on the horizontal support platform of the five-degree-of-freedom assembly platform, and place the lower pad flat into the bottom frame. Step 2: Adjust the pose of the optical components using the five-degree-of-freedom adjustment fixture in the five-degree-of-freedom assembly platform, so that the optical components are placed relatively accurately into the bottom frame and flexibly supported by the lower padding layer. Step 3: After installing the pressure frame using the positioning structure, screw in the fastening screws for initial fixation and apply adhesive in situ. Step 4: Place the initially fixed, airtight optical-mechanical assembly into the stress assessment system for low-stress assembly and adjustment; Step 5: Symmetrically disassemble the set screws of the frame-mounted airtight optical-mechanical assembly that has been assembled and adjusted to low stress, and use thread-locking adhesive at the original position to keep the optical-mechanical assembly in a low-stress state until all screws have been removed, installed and glued, thus completing the assembly of the frame-mounted airtight optical-mechanical assembly.

[0005] Preferably, in step three, the frame installation process is as follows: S30. After the optical element is rotated into the bottom frame and flexibly supported by the lower pad, a matching positioning structure is symmetrically inserted based on the gap width between the side of the optical element and the bottom frame. S30. After screwing the PTFE-headed set screw into the set screw hole on the side of the bottom frame, remove the positioning structure. S30. After flattening the upper pad and installing it into the pressure frame, place the pressure frame on the optical element and screw in the fastening screws to complete the initial fixation of the optical element.

[0006] Preferably, in step four, the low-stress assembly method is as follows: S40. Fix the initially fixed airtight optical-mechanical assembly in the frame to the support frame with screws. When fixing, the flatness of the contact surface between the two is ≤0.01mm. Use a torque screwdriver to control the tightening torque of the screws so that the torque error of all connecting screws does not exceed 5%. S41. After the support frame is connected to the three-dimensional adjustment stage, the optomechanical components and the interferometer are precisely aligned at the micrometer level by adjusting the up, down, pitch, and yaw functions of the three-dimensional adjustment stage. S42. Perform wavefront measurement on the optomechanical components and obtain the coefficients of the 5th and 6th terms of the Zernike polynomial as stress evaluation indicators for the optomechanical components. S43. Based on the coupled astigmatism map of the optomechanical components, after adjusting the torque of the fastening screws with a torque screwdriver, return to step S42 until the coefficients of Zernike terms 5 and 6 converge to the minimum, thus completing the low-stress assembly and adjustment of the optomechanical components.

[0007] Preferably, in S5, the originating thread adhesive refers to: Apply 3-5 threads of thread-locking adhesive to the root of the screw and the threaded hole of the optical-mechanical assembly, and use a torque screwdriver to tighten the screw back to its original position and apply torque under low stress. Before the thread adhesive cures, continue wavefront measurement and adjust the tightening torque of the corresponding screws in real time according to the astigmatism and the coefficients of the 5th and 6th terms of the Zernike polynomial to keep the optomechanical components in a low stress state until all screws are disassembled and glued.

[0008] An in-frame hermetic optical-mechanical assembly apparatus includes: an in-frame hermetic optical-mechanical assembly and a five-degree-of-freedom assembly and calibration platform and a stress assessment system that cooperate with it; The in-frame hermetically sealed optomechanical assembly includes optical elements and a positioning assembly that cooperates with them, the positioning assembly including: The bottom frame has a step I that matches the outer contour of the optical element; A lower pad layer set on step I to provide flexible support for optical components; A pressure frame is provided opposite to the bottom frame and has a corresponding structure. The pressure frame is provided with a step II that matches the outer contour of the optical element. An upper pad layer disposed on step II for flexibly defining optical elements; When the pressure frame is set on the bottom frame, the gap between step I and step II is adapted to the height of the optical element; The side of the bottom frame is provided with a plurality of set screw holes into which set screws can be inserted; The pressure frame is symmetrically provided with multiple sets of threaded holes for mounting fastening screws.

[0009] Preferably, the five-degree-of-freedom (DOF) calibration platform includes a horizontal support platform and a five-degree-of-freedom (DOF) adjustment fixture, wherein the five-degree-of-freedom (DOF) adjustment fixture includes: A translation module with outriggers, wherein the translation module can achieve adjustment in two degrees of freedom; A rotating module with two degrees of freedom is mounted on the translation module via a lifting module. The rotating module is equipped with a flexible pad.

[0010] Preferably, the stress assessment system includes: A three-dimensional adjustment platform is installed on the air flotation platform; Planar interferometers and standard plane mirrors are located on either side of the three-dimensional adjustment stage.

[0011] The present invention has at least the following beneficial effects: Firstly, the key structure of the positioning component of this invention is to set a set screw hole and a set screw on the side of the bottom frame to complete the pre-positioning of the optical element. Therefore, the core assembly method used is: feeler gauge positioning, set screw limiting, and adhesive spot replacement, which ensures the precise control of the size of the optical element after the frame is assembled. Secondly, the present invention designs a corresponding five-degree-of-freedom assembly platform to meet the assembly requirements of optical components that are loaded from top to bottom and have their attitudes precisely adjusted. Third, the present invention designs a stress assessment system for stress assessment during the assembly of a frame-sealed optomechanical assembly. It can adjust the screws in real time during the assembly process to keep the optomechanical assembly in a low-stress state. Fourth, the present invention designs a sealed structure of upper pad layer-optical element-lower pad layer, which achieves high airtightness while ensuring low stress state of optomechanical components; Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the frame-mounted hermetically sealed optical-mechanical assembly of the present invention; Figure 2 This is a schematic diagram of the structure of the five-degree-of-freedom calibration platform of the present invention; Figure 3 This is a schematic diagram of the structure of the five-degree-of-freedom adjustment fixture of the present invention; Figure 4 This is a schematic diagram of the internal structure of the translation module after the chassis cover plate is hidden in this invention; Figure 5 This is a schematic diagram of the internal structure of the rotating module of the present invention; Figure 6 This is a cross-sectional view of the present invention after the positioning mechanism has been inserted; Figure 7 This is a sectional view of one side of the present invention after the set screw has been installed; Figure 8 This is a schematic diagram showing the connection between the support member of the present invention and the initially fixed airtight optical-mechanical assembly in the frame; Figure 9 for Figure 8 A schematic diagram of the device installed on the three-dimensional adjustment platform; Figure 10 This is a schematic diagram of the stress assessment system. Figure 11 This is an astigmatic image of the present invention during the assembly of the frame-sealed optical-mechanical assembly; Figure 12 This is a schematic diagram illustrating the torque adjustment based on astigmatism in this invention. Among them, the components include: optical element-1, positioning assembly-2, base frame-20, step I-201, set screw hole-202, lower pad-21, pressure frame-22, step II-220, threaded hole-221, upper pad-23, set screw-24, fastening screw-25, five-degree-of-freedom assembly platform-3, horizontal support platform-30, five-degree-of-freedom adjustment fixture-31, translation module-310, translation plate I-3100, translation motor I-3101, translation plate II-3102, and so on. Moving motor II-3103, lifting module-311, rotating module-312, rotating motor I-3120, rotating motor II-3121, rotating plate I-3122, rotating plate II-3123, tension spring-3124, center ball-3125, flexible pad-313, outrigger-314, stress assessment system-4, air-floating platform-40, three-dimensional adjustment table-41, plane interferometer-42, standard plane mirror-43, equal thickness feeler gauge-5, support frame-6. Detailed Implementation

[0013] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0014] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0015] It should be noted that in the description of this invention, the orientations or positional relationships indicated by terms are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention. In addition, the terms "I" and "II" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0017] like Figure 1 As shown, the frame-sealed optical-mechanical assembly includes an optical element 1 and a positioning component 2 that cooperates with it. The positioning component includes: The bottom frame 20 has a step I 201 that matches the outer contour of the optical element 1. A lower pad 21 is provided on step I 201 to provide flexible support for optical element 1; A pressure frame 22 is provided opposite to the bottom frame 20 and has a corresponding structure. The pressure frame 22 is provided with a step II 220 that is adapted to the outer contour of the optical element 1. An upper pad 23 is provided on step II 220 to flexibly define the optical element 1; When the pressure frame 22 is set on the bottom frame 20, the gap between the step I 201 and the step II 220 is adapted to the height of the optical element 1. The side of the bottom frame 20 is provided with a plurality of set screw holes 202 into which set screws 24 can be inserted; The pressure frame 22 is symmetrically provided with multiple sets of threaded holes 221 for mounting fastening screws 25.

[0018] The low-stress assembly method for frame-sealed optical-mechanical components includes: Step 1: Construct a five-degree-of-freedom (DOF) assembly platform, place the bottom frame of the optomechanical assembly on the horizontal support platform of the five-DOF assembly platform, and place the lower pad layer flat into the bottom frame; like Figures 2-5 As shown, in this step, the five-degree-of-freedom calibration platform 3 includes a horizontal support platform 30 and a five-degree-of-freedom adjustment fixture 31, the five-degree-of-freedom adjustment fixture 31 including: The translation module 310 includes a support leg 314 for support. The translation module 310 enables adjustment in two degrees of freedom. Its main internal structure includes a translation plate I 3100 and corresponding translation motor I 3101, and a translation plate II 3102 and corresponding translation motor II 3103. The output end of translation motor II 3103 is fixed to translation plate I 3100. When translation motor I 3101 drives translation plate I 3100, translation motor II 3103 and translation plate II 3102 move within translation plate I 3100. When translation motor II 3103 drives translation plate II 3102, translation plate II 3102 moves relative to translation plate I 3100, completing the position adjustment in two degrees of freedom. The rotating module 312, which is mounted on the translation module 310 via the lifting module 311 and has two degrees of freedom adjustment functions, mainly includes: a rotating motor I 3120, a rotating motor II 3121, a rotating plate I 3122, a rotating plate II 3123, a tension spring 3124, and a center ball 3125. Among them, the rotating plate I 3122 is fixedly connected to the upper end of the lifting module 311 by screws. The rotating motor I 3120 and the rotating motor II 3121 are fixedly connected to the rotating plate I 3122. The rotating plate I 3122 and the rotating plate II 3123 are connected by the central ball 3125 and the tension springs 3124 at four ends. The cylindrical head of the rotating motor contacts the rotating plate II 3123 through the vertical linear motion of the rotating motor to generate two directions of movement: pitch and yaw. The rotating plate II 3123 has a threaded interface, which can realize the support and precise attitude adjustment of non-planar optical elements through the adapter. The lower end of the lifting module 311 is fixedly connected to the translation plate II 3102 by screws. The lifting module is a ball screw structure to realize the vertical lifting movement. The rotating module 312 is provided with a flexible pad 313, which serves as a buffer and support for the optical components in practical applications.

[0019] Step 2: Adjust the pose of the optical components using the five-degree-of-freedom adjustment fixture in the five-degree-of-freedom assembly platform, ensuring the optical components are placed relatively accurately into the bottom frame and flexibly supported by the lower padding layer; for example, Figure 1The hollow, frame-mounted, airtight optomechanical assembly shown in the diagram is placed on a horizontal support platform. If the optical element is a plane mirror, it can be placed directly on the flexible pad. If the optical element is a curved mirror, a connector matching the curvature of the optical element is developed using the standard threaded hole on the top of the rotating module. Then, the flexible pad and the optical element are placed on top in sequence for installation. During the insertion into the bottom frame (the optical element is supported by a five-degree-of-freedom fixture and falls into the bottom frame from top to bottom), the five-degree-of-freedom adjustment fixture can be used to continuously adjust the position and orientation of the optical element, ensuring its relatively precise placement in the frame. This avoids significant adjustments to the optical element's position after insertion and reduces the risk of surface friction damage.

[0020] Step 3: After installing the pressure frame using the positioning structure, screw in the fastening screws for initial fixation; In step three, the frame installation process is as follows: S30. After the optical element is screwed into the bottom frame and flexibly supported by the lower pad, a matching positioning structure is symmetrically inserted based on the gap width between the side of the optical element and the bottom frame. In practical applications, such as... Figure 6 As shown, the positioning mechanism uses a feeler gauge 5 of equal thickness to accurately position the optical element; S31, such as Figure 7 As shown, after screwing the PTFE-headed set screw into the set screw hole on the side of the bottom frame 20, remove the positioning structure. S32. After flattening the upper pad and installing it into the pressure frame, place the pressure frame on the optical element and tighten the fastening screws to complete the initial fixation of the optical element. S33. Disassemble the set screws symmetrically in sequence and inject silicone rubber in situ (in situ injection means: remove one set screw and inject silicone rubber into the set screw hole), let it stand to cure, and achieve in situ fixation of the adhesive spot to the optical element.

[0021] Step 4: Place the initially fixed, airtight optical-mechanical assembly into the stress assessment system for low-stress assembly and adjustment; In step four, the low-stress assembly method is as follows: S40, such as Figure 8 As shown, the initially fixed airtight optical engine assembly is fixed to the support frame 6 with screws. When fixing, the flatness of the contact surface between the two is ≤0.01mm. A torque screwdriver is used to control the screw tightening torque so that the torque error of all connecting screws does not exceed 5%, in order to control the additional stress introduced by the support frame to the optical engine assembly. S41, such as Figure 9As shown, after the support frame and the three-dimensional adjustment stage 41 are connected by screws, the optomechanical component and the interferometer are precisely aligned at the micrometer level by adjusting the up / down, pitch, and yaw functions of the three-dimensional adjustment stage. The precise alignment process is as follows: First, by adjusting the up / down degrees of freedom of the three-dimensional adjustment stage, the optomechanical component is placed within the measurement height range of the interferometer; second, the pitch and yaw degrees of freedom of the three-dimensional adjustment stage are adjusted to precisely align the optomechanical component and the interferometer, with an alignment accuracy of micrometer level, so that the coefficients of the second and third terms (the degree of tilt in the X and Y directions) of the Zernike polynomial in the interferometer software are both <0.1, at which point the interference fringes are in the sparsest state. S42. Perform wavefront measurement on the optomechanical assembly to obtain the coefficients of the 5th and 6th terms of the Zernike polynomial. The 5th term is the (45° / -45°) astigmatism, and the 6th term is the (0°, 90°) astigmatism. The two coefficients are used as stress evaluation indicators for the optomechanical assembly. S43. Optomechanical components typically produce coupled astigmatism in the two directions mentioned above. The astigmatic image presents as cross-shaped symmetrical fringes, such as... Figure 11 As shown, the red area indicates the region of higher stress. Adjust the torque of screws near the red area using a torque screwdriver, as follows: Figure 12 As shown, the Zernike coefficients 5 and 6 are measured in real time, and a new astigmatism map is obtained. The screw torque is recorded in real time. This process is repeated until the Zernike coefficients 5 and 6 converge to the minimum, thus completing the low-stress assembly of the optomechanical components.

[0022] Furthermore, such as Figure 10 As shown, the stress assessment system 4 includes: A three-dimensional adjustment platform 41 is installed on the air flotation platform 40; The plane interferometer 42 and the standard plane mirror 43 are located on both sides of the three-dimensional adjustment stage 41. In practical applications, the plane interferometer 42 is turned on and kept stationary, and the relative angle of the standard plane mirror 43 is adjusted so that the interference fringes generated by the plane interferometer 42 and the standard plane mirror 43 are in a zero-fringe state, thus completing the calibration of the detection optical path. Step 5: Symmetrically remove the set screws from the frame-mounted airtight optical-mechanical assembly after low-stress assembly and use thread-locking adhesive at the original position to keep the optical-mechanical assembly in a low-stress state until all screws are removed, installed, and glued, thus completing the assembly of the frame-mounted airtight optical-mechanical assembly.

[0023] In this step, if the optomechanical components require screw adhesive curing, one screw must be removed symmetrically in the wavefront detection optical path for each operation. Apply 3-5 layers of thread-locking adhesive to the screw root and the threaded hole of the optomechanical components. Use a torque screwdriver to tighten the screw back to its original position and to the torque under low stress. Continue wavefront measurement before the thread-locking adhesive cures. Adjust the tightening torque of the screw in real time based on the astigmatism and the coefficients of the 5th and 6th terms of the Zernike polynomial to keep the optomechanical components in a low stress state until all screws have been removed, installed, and adhesive-coated.

[0024] The above solution is merely an illustration of a preferred example and is not limited thereto. When implementing this invention, appropriate substitutions and / or modifications can be made according to the user's needs.

[0025] The number of devices and processing scale described herein are for the purpose of simplifying the description of the invention. Applications, modifications, and variations of the invention will be readily apparent to those skilled in the art.

[0026] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for the present invention. Other modifications can be readily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and examples shown and described herein.

Claims

1. A low-stress assembly method for a frame-mounted hermetic optical-mechanical assembly, characterized in that, include: Step 1: Construct a five-degree-of-freedom assembly platform. Place the bottom frame of the optical engine component on the horizontal support platform of the five-degree-of-freedom assembly platform, and place the lower pad flat into the bottom frame. Step 2: Adjust the pose of the optical components using the five-degree-of-freedom adjustment fixture in the five-degree-of-freedom assembly platform, so that the optical components are placed relatively accurately into the bottom frame and flexibly supported by the lower padding layer. Step 3: After installing the pressure frame using the positioning structure, screw in the fastening screws for initial fixation and apply adhesive in situ. Step 4: Place the initially fixed, airtight optical-mechanical assembly into the stress assessment system for low-stress assembly and adjustment; Step 5: Symmetrically disassemble the set screws of the frame-mounted airtight optical-mechanical assembly that has been assembled and adjusted to low stress, and use thread-locking adhesive at the original position to keep the optical-mechanical assembly in a low-stress state until all screws have been removed, installed and glued, thus completing the assembly of the frame-mounted airtight optical-mechanical assembly.

2. The low-stress assembly method for the frame-mounted hermetic optical-mechanical assembly as described in claim 1, characterized in that, In step three, the frame installation process is as follows: S30. After the optical element is rotated into the bottom frame and flexibly supported by the lower pad, a matching positioning structure is symmetrically inserted based on the gap width between the side of the optical element and the bottom frame. S30. After screwing the PTFE-headed set screw into the set screw hole on the side of the bottom frame, remove the positioning structure. S30. After flattening the upper pad and installing it into the pressure frame, place the pressure frame on the optical element and screw in the fastening screws to complete the initial fixation of the optical element.

3. The low-stress assembly method for a frame-mounted hermetically sealed optomechanical assembly as described in claim 1, characterized in that, In step four, the low-stress assembly method is as follows: S40. Fix the initially fixed airtight optical-mechanical assembly in the frame to the support frame with screws. When fixing, the flatness of the contact surface between the two is ≤0.01mm. Use a torque screwdriver to control the tightening torque of the screws so that the torque error of all connecting screws does not exceed 5%. S41. After the support frame is connected to the three-dimensional adjustment stage, the optomechanical components and the interferometer are precisely aligned at the micrometer level by adjusting the up, down, pitch, and yaw functions of the three-dimensional adjustment stage. S42. Perform wavefront measurement on the optomechanical components and obtain the coefficients of the 5th and 6th terms of the Zernike polynomial as stress evaluation indicators for the optomechanical components. S43. Based on the coupled astigmatism map of the optomechanical components, after adjusting the torque of the fastening screws with a torque screwdriver, return to step S42 until the coefficients of Zernike terms 5 and 6 converge to the minimum, thus completing the low-stress assembly and adjustment of the optomechanical components.

4. The low-stress assembly method for a frame-mounted hermetically sealed optomechanical assembly as described in claim 1, characterized in that, In S5, the original site thread adhesive refers to: Apply 3-5 threads of thread-locking adhesive to the root of the screw and the threaded hole of the optical-mechanical assembly, and use a torque screwdriver to tighten the screw back to its original position and apply torque under low stress. Before the thread adhesive cures, continue wavefront measurement and adjust the tightening torque of the corresponding screws in real time according to the astigmatism and the coefficients of the 5th and 6th terms of the Zernike polynomial to keep the optomechanical components in a low stress state until all screws are disassembled and glued.

5. An in-frame hermetic optical-mechanical assembly apparatus, applied in the low-stress assembly method for in-frame hermetic optical-mechanical assemblies as described in any one of claims 1-4, characterized in that, include: The frame-mounted airtight optical-mechanical components and their associated five-degree-of-freedom assembly and calibration platform, as well as the stress assessment system; The in-frame hermetically sealed optomechanical assembly includes optical elements and a positioning assembly that cooperates with them, the positioning assembly including: The bottom frame has a step I that matches the outer contour of the optical element; A lower pad layer set on step I to provide flexible support for optical components; A pressure frame is provided opposite to the bottom frame and has a corresponding structure. The pressure frame is provided with a step II that matches the outer contour of the optical element. An upper pad layer disposed on step II for flexibly defining optical elements; When the pressure frame is set on the bottom frame, the gap between step I and step II is adapted to the height of the optical element; The side of the bottom frame is provided with a plurality of set screw holes into which set screws can be inserted; The pressure frame is symmetrically provided with multiple sets of threaded holes for mounting fastening screws.

6. The in-frame hermetic optical-mechanical assembly apparatus as described in claim 5, characterized in that, The five-degree-of-freedom (DOF) calibration platform includes a horizontal support platform and a five-degree-of-freedom (DOF) adjustment fixture, which includes: A translation module with outriggers, wherein the translation module can achieve adjustment in two degrees of freedom; A rotating module with two degrees of freedom is mounted on the translation module via a lifting module. The rotating module is equipped with a flexible pad.

7. The in-frame hermetic optical-mechanical assembly apparatus as described in claim 5, characterized in that, The stress assessment system includes: A three-dimensional adjustment platform is set on the air flotation platform; Planar interferometers and standard plane mirrors are located on either side of the three-dimensional adjustment stage.

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