Controllable clamping method for adhesive layer of laminated double-sided mirror

Abstract

The invention discloses a controllable clamping method for an adhesive layer of a laminated double-sided mirror. The controllable clamping method comprises the following steps: S1, constructing a symmetrical adjustable-pressure clamping mechanism; s2, glue layer thickness presetting and initial positioning are carried out; s3, dynamic pressure regulation and control and adhesive layer leveling are executed; s4, glue layer thickness online monitoring and feedback correction are introduced; and S5, step-type curing and stress-free release are completed. According to the controllable clamping method for the adhesive layer of the laminated double-sided mirror, closed-loop control over the thickness of the adhesive layer within the micron-level range is achieved by fusing laser interference ranging, fiber grating online monitoring and a dynamic pressure feedback mechanism, the thickness uniformity is superior to a preset uniformity threshold value and is remarkably superior to the control level of a traditional rigid clamping process, and the clamping precision is greatly improved. And wavefront distortion and optical performance reduction caused by uneven thickness are effectively inhibited.

Description

Technical Field

[0001] This invention relates to the field of glass production technology, specifically to a method for controllable clamping of the adhesive layer in laminated double-sided mirrors. Background Technology

[0002] With the continuous advancement of optical device manufacturing technology, laminated double-sided mirrors are receiving increasing attention due to their crucial role in laser systems, imaging equipment, and precision measuring instruments. Laminated double-sided mirrors typically consist of two high-precision optical lenses bonded together with an interlayer adhesive. Their optical performance is highly dependent on the uniformity of the adhesive layer thickness, the parallelism between the lenses, and stress control during the clamping process. Especially with adhesive layer thickness requirements at the μm level, any minute clamping deviation or pressure unevenness can trigger wavefront distortion, reflectivity mismatch, or interface scattering, thereby significantly reducing the overall performance and reliability of the device.

[0003] The bonding process of laminated double-sided mirrors places stringent demands on the dynamic adaptability and control precision of the clamping system. Existing clamping technologies mostly employ rigid positioning structures, which cannot compensate for micro-deformations caused by temperature changes, colloid flow, or curing shrinkage during colloid curing, resulting in uneven colloid thickness distribution. Furthermore, traditional devices lack real-time sensing capabilities of the colloid state, making it difficult to dynamically adjust applied pressure during clamping, easily leading to air bubble residue, lens misalignment, or localized stress concentration. In addition, the problem of asymmetrical force on the upper and lower lenses is common, further exacerbating colloid thickness deviations and optical surface shape errors.

[0004] Therefore, there is an urgent need for a clamping method for double-sided mirrors that can achieve precise control of adhesive layer thickness, dynamic feedback of clamping pressure, and symmetrical force protection. Summary of the Invention

[0005] The purpose of this invention is to provide a method for controllable clamping of the adhesive layer of a double-sided laminated mirror, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for controllable clamping of adhesive layers in a double-sided laminated mirror, comprising the following steps:

[0007] S1: Construct a symmetrical adjustable pressure clamping mechanism. At the upper and lower lens clamping ends, respectively, a clamping assembly consisting of a flexible pressure head, a pressure servo unit, and a displacement feedback module is set. The contact surface between the flexible pressure head and the lens is covered with polytetrafluoroethylene. The pressure servo unit adjusts the pressure applied to the lens surface in real time through closed-loop control. The displacement feedback module is used to monitor the micro-displacement changes of the lens during the clamping process.

[0008] S2: Implement the preset thickness and initial positioning of the adhesive layer. After uniformly coating the upper surface of the lower lens with optical adhesive, the upper lens is initially placed on top of the adhesive layer in a parallel posture. The distance between the upper and lower lenses is measured non-contactly using a laser interferometric ranging device. The measured value is compared with the preset adhesive layer thickness target value. If the deviation is greater than the preset threshold, the fine-tuning mechanism is activated to correct the posture.

[0009] S3: Perform dynamic pressure control and adhesive layer leveling. In the early stage of adhesive curing, the pressure servo unit of the upper and lower clamping components is started simultaneously to apply a symmetrical load with an initial pressure of a predetermined value. Based on the real-time data output by the displacement feedback module, the pressure difference between the upper and lower components is dynamically adjusted at a specific period to ensure that the pressure difference is always less than the preset pressure difference threshold. At the same time, the total pressure is maintained within the preset pressure range, so as to promote the uniform leveling of the adhesive under controlled conditions.

[0010] S4: Introducing online monitoring and feedback correction of adhesive layer thickness. During the curing process of the adhesive, the thickness data of multiple points inside the adhesive layer is collected in real time through an embedded fiber optic grating sensor array. When a local thickness deviation is detected to exceed the preset threshold, the local pressure fine-tuning mechanism is automatically triggered to apply compensating pressure to the flexible pressure head in the corresponding area, so that the adhesive layer thickness is restored to the target range.

[0011] S5: Completes stepped curing and stress-free release. After the colloid reaches the preset initial curing strength, the applied pressure is gradually reduced to a predetermined value and maintained at this pressure until complete curing. Then, the pressure is linearly unloaded at a predetermined rate to achieve stress-free release of the lens.

[0012] Furthermore, the radius of curvature of the contact surface of the flexible pressure head matches the curvature of the surface of the clamped lens, and the polytetrafluoroethylene coating has a predetermined thickness and a surface roughness less than a preset roughness threshold.

[0013] Furthermore, the pressure servo unit includes a high-precision proportional valve, a miniature hydraulic cylinder, and a pressure sensor, with a pressure control resolution reaching a preset resolution and a response time less than a preset response time threshold.

[0014] Furthermore, the displacement feedback module uses a capacitive displacement sensor, which is installed in the non-working area between the clamping assembly and the lens edge. The measurement range is a preset measurement interval, the resolution is better than a preset resolution threshold, and the sampling frequency is a preset sampling frequency.

[0015] Furthermore, the laser interferometric ranging device is equipped with a dual-wavelength light source, which eliminates the influence of environmental disturbances through the principle of synthetic wavelength interference, and the ranging accuracy reaches a preset accuracy threshold.

[0016] Furthermore, the fiber optic grating sensor array is distributed in a grid pattern along the radial and circumferential directions of the lens, with a grid spacing of a predetermined distance. Each sensing point can independently monitor local changes in adhesive layer thickness, and its strain sensitivity is a preset sensitivity value. The temperature cross-sensitivity, after encapsulation compensation, is less than a preset temperature sensitivity threshold.

[0017] Furthermore, the local pressure fine-tuning mechanism is implemented by a piezoelectric ceramic actuator, whose stroke range is a preset stroke interval, and whose positioning accuracy is better than a preset positioning accuracy threshold. It can complete the pressure compensation action within a preset response time after receiving the thickness deviation signal.

[0018] Furthermore, the stepped curing process is divided into three stages: the first stage is maintained under a predetermined pressure for a predetermined time period to allow the colloid to complete the initial cross-linking;

[0019] The second stage involves reducing the pressure to another predetermined level and maintaining the temperature for another predetermined period of time to promote uniform shrinkage of the colloid.

[0020] The third stage maintains a predetermined time period under lower predetermined pressure to complete the final curing, with the temperature of each stage controlled within the preset temperature range.

[0021] Furthermore, the fine-tuning mechanism includes a three-degree-of-freedom precision translation stage and a two-dimensional tilt adjustment platform, with translation resolution better than a preset translation resolution threshold and angle adjustment resolution better than a preset angle resolution threshold.

[0022] Furthermore, the method is applicable to the manufacturing of laminated double-sided mirrors with a predetermined diameter range and an adhesive layer thickness within a preset thickness range, with fully automated control throughout the process.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: The controllable clamping method of the adhesive layer of the double-sided mirror: by integrating laser interferometric ranging, fiber optic grating online monitoring and dynamic pressure feedback mechanism, the closed-loop control of the adhesive layer thickness in the μm range is realized. The thickness uniformity is better than the preset uniformity threshold, which is significantly better than the control level of the traditional rigid clamping process, and effectively suppresses the wavefront distortion and optical performance degradation caused by uneven thickness.

[0024] The upper and lower symmetrical adjustable pressure clamping mechanism and millisecond-level pressure servo system are adopted to ensure that the upper and lower lenses are subjected to highly symmetrical force throughout the entire process of colloid curing, and the pressure difference is controlled within the preset pressure difference threshold. Combined with the step-type unloading strategy, the generation of residual stress is completely avoided, and the lens surface error is stably controlled within the preset surface error threshold.

[0025] The synergistic effect of dynamic pressure control and colloid leveling applies optimized pressure at the optimal stage of colloid fluidity, effectively removing air bubbles and preventing lens slippage. The air bubble residue rate is lower than the preset residue rate threshold, and the lens center offset is less than the preset offset threshold, which greatly improves product consistency and reliability.

[0026] The method is compatible with various optical colloids and lens sizes. Through multi-source sensor data fusion and closed-loop control algorithms, it achieves autonomous decision-making throughout the entire process from initial positioning and leveling control to curing and release, without the need for manual intervention, thus meeting the needs of mass production of high-precision optical components. Attached Figure Description

[0027] Figure 1 This is a flowchart illustrating a method for controllable clamping of adhesive layers in a double-sided mirror according to the present invention. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figure 1 This invention provides a technical solution: a controllable clamping method for the adhesive layer of a double-sided laminated mirror, S1: constructing a symmetrical adjustable pressure clamping mechanism, and setting clamping components consisting of a flexible pressure head, a pressure servo unit and a displacement feedback module at the upper and lower lens clamping ends respectively. The contact surface between the flexible pressure head and the lens adopts a polytetrafluoroethylene-coated structure. The pressure servo unit adjusts the pressure applied to the lens surface in real time through closed-loop control. The displacement feedback module is used to monitor the micro-displacement changes of the lens during the clamping process.

[0030] S2: Implement the preset thickness and initial positioning of the adhesive layer. After uniformly coating the upper surface of the lower lens with optical adhesive, the upper lens is initially placed on top of the adhesive layer in a parallel posture. The distance between the upper and lower lenses is measured non-contactly using a laser interferometric ranging device. The measured value is compared with the preset adhesive layer thickness target value. If the deviation is greater than the preset threshold, the fine-tuning mechanism is activated to correct the posture.

[0031] S3: Perform dynamic pressure control and adhesive layer leveling. In the early stage of adhesive curing, the pressure servo unit of the upper and lower clamping components is started simultaneously to apply a symmetrical load with an initial pressure of a predetermined value. Based on the real-time data output by the displacement feedback module, the pressure difference between the upper and lower components is dynamically adjusted at a specific period to ensure that the pressure difference is always less than the preset pressure difference threshold. At the same time, the total pressure is maintained within the preset pressure range, so as to promote the uniform leveling of the adhesive under controlled conditions.

[0032] S4: Introducing online monitoring and feedback correction of adhesive layer thickness. During the curing process of the adhesive, the thickness data of multiple points inside the adhesive layer is collected in real time through an embedded fiber optic grating sensor array. When a local thickness deviation is detected to exceed the preset threshold, the local pressure fine-tuning mechanism is automatically triggered to apply compensating pressure to the flexible pressure head in the corresponding area, so that the adhesive layer thickness is restored to the target range.

[0033] S5: Completes stepped curing and stress-free release. After the colloid reaches the preset initial curing strength, the applied pressure is gradually reduced to a predetermined value and maintained at this pressure until complete curing. Then, the pressure is linearly unloaded at a predetermined rate to achieve stress-free release of the lens.

[0034] The S1 constructs a symmetrical adjustable pressure clamping mechanism: clamping assemblies consisting of a flexible pressure head, a pressure servo unit, and a displacement feedback module are respectively installed at the upper and lower lens clamping ends. Specifically, the flexible pressure head adopts a high elastic modulus metal substrate structure, and its contact surface with the lens is entirely covered with a layer of polytetrafluoroethylene (PTFE) material with a thickness of 50μm to 200μm. This coating layer is firmly attached to the metal substrate surface through plasma surface activation and hot-pressing composite process, ensuring that it does not peel off or deform during long-term cyclic use. The surface roughness Ra value of the PTFE coating layer is controlled below 0.02μm to avoid scratching the optical lens surface or introducing local stress concentration during clamping. The radius of curvature of the contact surface of the flexible pressure head is customized and matched according to the surface curvature of the clamped lens. For planar lenses, the contact surface is strictly planar; for spherical lenses, the radius of curvature of the contact surface is consistent with the radius of curvature of the concave or convex surface of the lens, with a tolerance controlled within ±0.5%, thereby ensuring that the pressure is evenly distributed throughout the entire contact area.

[0035] The pressure servo unit includes a high-precision proportional valve, a miniature hydraulic cylinder, and a pressure sensor. The high-precision proportional valve is a pilot-operated electro-hydraulic proportional pressure reducing valve with a control voltage range of 0 to 10V, corresponding to an output pressure range of 0 to 1MPa, a pressure control resolution of 10Pa, and a response time of less than 5 milliseconds. The miniature hydraulic cylinder has a piston stroke of 0 to 5mm and an inner diameter of 8mm, employing a low-friction sealing ring to reduce hysteresis. The pressure sensor is integrated at the outlet end of the hydraulic cylinder, with a sampling frequency of 1kHz and a measurement accuracy better than ±0.1% of full scale, feeding the pressure signal back to the central controller in real time. This pressure servo unit adjusts the pressure applied to the lens surface in real time through a closed-loop control algorithm. When micro-displacement of the lens caused by colloid flow or curing shrinkage is detected, the system completes pressure compensation within 10 milliseconds, achieving a millisecond-level dynamic response to micro-deformations.

[0036] The displacement feedback module employs a capacitive displacement sensor, installed in the non-working area between the clamping assembly and the lens edge, specifically avoiding the annular edge region of the lens's effective light-transmitting aperture. This sensor has a measurement range of 0 to 100 μm, a resolution better than 1 nm, and a sampling frequency set to 2 kHz, enabling real-time capture of the lens's elastic deformation and overall displacement under pressure. The initial gap between the sensor probe and the lens edge is set to 50 μm, and a temperature compensation circuit eliminates the influence of ambient temperature fluctuations on the measurement results. Displacement data is transmitted to the central controller in digital signal form via an RS-485 bus, updating the displacement status every 200 microseconds, providing highly timely input for subsequent dynamic pressure control.

[0037] In the above-mentioned controllable clamping method for the adhesive layer of a double-sided laminated mirror, step S2 involves pre-setting and initially positioning the adhesive layer thickness: after uniformly coating the upper surface of the lower lens with optical adhesive, the upper lens is initially placed on top of the adhesive layer in a parallel orientation. The optical adhesive is precisely applied using a dispensing robot, with an adhesive volume control accuracy of ±1%. The dispensing trajectory is spiral, expanding outward from the center to ensure that the adhesive layer is free of voids and has a initially uniform thickness. The upper lens is grasped and initially placed by a six-degree-of-freedom robotic arm, and its initial orientation is guided by a vision positioning system to ensure that the deviation between the central axes of the upper and lower lenses is less than 50 μm.

[0038] Subsequently, a non-contact measurement of the distance between the upper and lower mirrors was performed using a laser interferometric ranging device. This laser interferometric ranging device is equipped with a dual-wavelength light source, with wavelengths of [missing information]. nm and Equivalent wavelengths are generated through the principle of synthetic wavelength interference. This effectively eliminates the influence of environmental factors such as air disturbance and temperature drift on measurement accuracy. The ranging system selects nine measurement points on the lens surface, arranged in a 3×3 grid. Each point collects 100 interference signals and averages them, achieving a final ranging accuracy of ±0.1μm. The measured distance between the upper and lower lenses is transmitted to the central controller in real time and compared with a preset target value for the adhesive layer thickness (e.g., 20μm). If the absolute value of the deviation at any measurement point exceeds a preset threshold (e.g., 1μm), a fine-tuning mechanism is activated for attitude correction.

[0039] The fine-tuning mechanism includes a three-degree-of-freedom precision translation stage and a two-dimensional tilt adjustment platform. The three-degree-of-freedom precision translation stage employs a piezoelectric ceramic-driven nano-positioning platform with a travel range of ±100μm in each of the X, Y, and Z directions, achieving a translation resolution better than 2nm. The two-dimensional tilt adjustment platform is based on a flexible hinge structure, with an angle adjustment range of ±0.5 degrees around the X and Y axes, achieving an angle adjustment resolution better than 0.1 arcseconds. After receiving deviation data from the laser interferometric ranging device, the fine-tuning mechanism fits the relative attitude of the upper and lower mirrors using the least squares method, calculates the required six-degree-of-freedom adjustment amount, and completes the correction action within 500 milliseconds, ensuring that the initial parallelism error of the upper and lower mirrors is less than 0.5 arcseconds.

[0040] In the above-described controllable clamping method for the adhesive layer of a double-sided mirror, step S3 performs dynamic pressure control and adhesive layer leveling: During the initial stage of adhesive curing, the pressure servo unit of the upper and lower clamping components is simultaneously activated, applying a symmetrical load with an initial pressure of a predetermined value (e.g., 5 kPa). This initial pressure value is preset according to the viscosity-time characteristic curve of the adhesive to ensure that the adhesive is within its optimal flow window. Subsequently, based on real-time data output by the displacement feedback module, the system dynamically adjusts the pressure difference between the upper and lower components at specific intervals (e.g., every 100 milliseconds).

[0041] The specific logic of dynamic pressure control is as follows: Let the pressure applied by the upper clamping assembly be... The pressure applied by the lower clamping assembly is Total pressure Pressure difference System maintenance Within a preset pressure range (e.g., 8 kPa to 12 kPa), while ensuring The pressure difference is always less than a preset threshold (e.g., 100 Pa). When the displacement feedback module detects that the sinking of a certain area of ​​the upper lens is greater than that of the corresponding area of ​​the lower lens, it indicates that the adhesive layer in that area is too thick. The system automatically increases the pressure of the upper clamping assembly in that area or decreases the pressure of the corresponding area of ​​the lower clamping assembly to accelerate the flow of the adhesive to the thinner area. Conversely, the same applies. This process is achieved through a multivariable feedback control algorithm to ensure that the adhesive flows uniformly and evenly under controlled conditions.

[0042] In the above-mentioned controllable clamping method for the adhesive layer of laminated double-sided mirrors, step S4 introduces online monitoring and feedback correction of the adhesive layer thickness: during the adhesive curing process, multi-point thickness data inside the adhesive layer are collected in real time through an embedded fiber Bragg grating sensor array. The fiber Bragg grating sensor array is distributed in a grid pattern along the radial and circumferential directions of the lens, with a grid spacing of 5 mm. For a lens with a diameter of 100 mm, a total of 225 sensing points (15×15 grid) are arranged. Each fiber Bragg grating sensing point is encapsulated in a 125 μm diameter quartz optical fiber and is pre-embedded in the designed position of the adhesive layer during the manufacturing of the lens blank to ensure that it is located in the geometric center plane of the adhesive layer.

[0043] Each sensing point can independently monitor local changes in adhesive layer thickness, and its working principle is based on the relationship between Bragg wavelength shift and strain. When the adhesive layer thickness changes, the fiber grating is subjected to axial strain. This leads to the Bragg wavelength An offset occurs, satisfying the following relation:

[0044]

[0045] in, The effective photoelastic coefficient is set to 0.22 for silica fiber. The system demodulates the wavelength shift at each sensing point to invert the local strain, and then calculates the change in adhesive layer thickness. The strain sensitivity of this sensor array is 1.2 picometers / microstrain, and the temperature cross-sensitivity, after special encapsulation (using a low thermal expansion coefficient sleeve and a temperature compensation grating), is less than 1 microstrain / degree Celsius.

[0046] When a local thickness deviation exceeding a preset threshold (e.g., 0.3 μm) is detected, the system automatically triggers a local pressure fine-tuning mechanism. This mechanism is implemented using piezoelectric ceramic actuators, with multiple miniature piezoelectric ceramic actuators integrated on the back of each flexible indenter, arranged concentrically. The piezoelectric ceramic actuators have a stroke range of 0 to 10 μm and a positioning accuracy better than 5 nm, completing pressure compensation within 5 milliseconds of receiving the thickness deviation signal. For example, if the adhesive layer is detected to be too thick at the (i,j)th sensing point, the piezoelectric ceramic actuator in the corresponding area extends, causing the flexible indenter to press down locally, applying additional compensating pressure. This prompts the adhesive to flow to adjacent areas, restoring the adhesive layer thickness to the target range (e.g., 20 ± 0.2 μm).

[0047] In the above-mentioned controllable clamping method for the adhesive layer of double-sided mirrors, step S5 completes the stepped curing and stress-free release: after the colloid reaches the preset initial strength (e.g., the storage modulus G' reaches 10^4 Pascals), the system gradually reduces the applied pressure to a predetermined value. The stepped curing process is divided into three stages: the first stage is maintained at 10 kPa pressure for 30 minutes to allow the colloid to complete the initial cross-linking and form a stable three-dimensional network structure; the second stage is reduced to 5 kPa and kept at a temperature for 60 minutes to promote uniform shrinkage of the colloid under lower constraints and reduce the accumulation of internal stress; the third stage is maintained at 2 kPa for 120 minutes to complete the final curing, and the temperature of each stage is controlled in a constant temperature environment of 25 ± 0.5 degrees Celsius.

[0048] After complete curing, the system linearly unloads the pressure at a predetermined rate (e.g., 10 Pascals / second). This unloading rate is optimized based on the creep characteristics of the colloid to ensure that the lens does not experience elastic rebound or plastic deformation during release. After unloading, the flexible pressure head automatically retracts, and the robotic arm removes the finished product. The final laminated double-sided mirror product exhibits a colloid thickness uniformity better than 0.3 μm (peak-valley value) and a parallelism error between lenses less than 0.3 arcseconds.

[0049] Specific application example: Manufacturing a planar laminated double-sided mirror with a diameter of 80mm and a target adhesive layer thickness of 15μm.

[0050] First, an epoxy resin colloid with a refractive index of 1.52 was selected, and the operation was carried out at 25 degrees Celsius. In step S1, the contact surface of the flexible indenter was planar, the polytetrafluoroethylene coating thickness was 100 μm, and the surface roughness Ra = 0.015 μm. The pressure servo unit was set to an initial pressure resolution of 5 Pa and a response time of 3 milliseconds. The displacement feedback module sampling frequency was set to 2 kHz, and the measurement range was 0 to 80 μm.

[0051] In step S2, the laser interferometric ranging device uses dual wavelengths of 632.8nm and 532nm. The measurement results at 9 points show that the maximum spacing deviation is 1.2μm, which exceeds the 1μm threshold. The fine-tuning mechanism is activated and corrects the parallelism error to 0.4 arcseconds within 500 milliseconds.

[0052] In step S3, the initial pressure is set to 4 kPa, the total pressure is maintained at 10 kPa ± 0.5 kPa, the pressure difference threshold is set to 80 Pa, and the pressure is adjusted every 100 milliseconds.

[0053] In step S4, the fiber grating array is a 13×13 grid (6.25mm spacing). Thickness deviations exceeding 0.3μm were detected at 3 points, and the local pressure fine-tuning mechanism completed compensation within 8 milliseconds.

[0054] In step S5, the three-stage pressure for stepped curing are 8 kPa (30 minutes), 4 kPa (60 minutes), and 1.5 kPa (120 minutes), with an unloading rate of 8 Pascals / second. The final product, inspected using a white light interferometer, showed a uniform adhesive layer thickness of 0.25 μm (peak-valley value), a parallelism error of 0.25 arcseconds, a bubble residue rate of 0.1%, a center offset of less than 10 μm, and a yield of 98.5%.

Claims

1. A method for controllable clamping of the adhesive layer in a laminated double-sided mirror, characterized in that, Includes the following steps: S1: Construct a symmetrical adjustable pressure clamping mechanism. At the upper and lower lens clamping ends, respectively, a clamping assembly consisting of a flexible pressure head, a pressure servo unit, and a displacement feedback module is set. The contact surface between the flexible pressure head and the lens is covered with polytetrafluoroethylene. The pressure servo unit adjusts the pressure applied to the lens surface in real time through closed-loop control. The displacement feedback module is used to monitor the micro-displacement changes of the lens during the clamping process. S2: Implement the preset thickness and initial positioning of the adhesive layer. After uniformly coating the upper surface of the lower lens with optical adhesive, the upper lens is initially placed on top of the adhesive layer in a parallel posture. The distance between the upper and lower lenses is measured non-contactly using a laser interferometric ranging device. The measured value is compared with the preset adhesive layer thickness target value. If the deviation is greater than the preset threshold, the fine-tuning mechanism is activated to correct the posture. S3: Perform dynamic pressure control and adhesive layer leveling. In the early stage of adhesive curing, the pressure servo unit of the upper and lower clamping components is started simultaneously to apply a symmetrical load with an initial pressure of a predetermined value. Based on the real-time data output by the displacement feedback module, the pressure difference between the upper and lower components is dynamically adjusted at a specific period to ensure that the pressure difference is always less than the preset pressure difference threshold. At the same time, the total pressure is maintained within the preset pressure range, so as to promote the uniform leveling of the adhesive under controlled conditions. S4: Introducing online monitoring and feedback correction of adhesive layer thickness. During the curing process of the adhesive, the thickness data of multiple points inside the adhesive layer is collected in real time through an embedded fiber optic grating sensor array. When a local thickness deviation is detected to exceed the preset threshold, the local pressure fine-tuning mechanism is automatically triggered to apply compensating pressure to the flexible pressure head in the corresponding area, so that the adhesive layer thickness is restored to the target range. S5: Completes stepped curing and stress-free release. After the colloid reaches the preset initial curing strength, the applied pressure is gradually reduced to a predetermined value and maintained at this pressure until complete curing. Then, the pressure is linearly unloaded at a predetermined rate to achieve stress-free release of the lens.

2. The method for controllable clamping of the adhesive layer in a double-sided laminated mirror according to claim 1, characterized in that, The radius of curvature of the contact surface of the flexible pressure head matches the curvature of the surface of the clamped lens, and the polytetrafluoroethylene coating has a predetermined thickness and a surface roughness less than a preset roughness threshold.

3. The method for controllable clamping of the adhesive layer in a double-sided laminated mirror according to claim 2, characterized in that, The pressure servo unit includes a high-precision proportional valve, a miniature hydraulic cylinder, and a pressure sensor. Its pressure control resolution reaches a preset resolution, and its response time is less than a preset response time threshold.

4. The method for controllable clamping of the adhesive layer in a double-sided laminated mirror according to claim 3, characterized in that, The displacement feedback module uses a capacitive displacement sensor, which is installed in the non-working area between the clamping assembly and the edge of the lens. The measurement range is a preset measurement interval, the resolution is better than a preset resolution threshold, and the sampling frequency is a preset sampling frequency.

5. The method for controllable clamping of the adhesive layer in a double-sided laminated mirror according to claim 4, characterized in that, The laser interferometric ranging device is equipped with a dual-wavelength light source and eliminates the influence of environmental disturbances through the principle of synthetic wavelength interference, achieving a ranging accuracy that meets a preset accuracy threshold.

6. The method for controllable clamping of the adhesive layer in a double-sided laminated mirror according to claim 5, characterized in that, The fiber optic grating sensor array is distributed in a grid pattern along the radial and circumferential directions of the lens, with a grid spacing of a predetermined distance. Each sensing point can independently monitor local changes in adhesive layer thickness, and its strain sensitivity is a preset sensitivity value. The temperature cross-sensitivity is less than a preset temperature sensitivity threshold after encapsulation compensation.

7. The method for controllable clamping of the adhesive layer in a double-sided laminated mirror according to claim 6, characterized in that, The local pressure fine-tuning mechanism is implemented by a piezoelectric ceramic actuator. Its stroke range is a preset stroke interval, and its positioning accuracy is better than a preset positioning accuracy threshold. It can complete the pressure compensation action within a preset response time after receiving the thickness deviation signal.

8. The method for controllable clamping of the adhesive layer in a double-sided laminated mirror according to claim 7, characterized in that, The stepped curing process is divided into three stages: the first stage is to maintain a predetermined pressure for a predetermined time period to allow the colloid to complete the initial cross-linking; The second stage involves reducing the pressure to another predetermined level and maintaining the temperature for another predetermined period of time to promote uniform shrinkage of the colloid. The third stage maintains a predetermined time period under lower predetermined pressure to complete the final curing, with the temperature of each stage controlled within the preset temperature range.

9. The method for controllable clamping of the adhesive layer of a double-sided laminated mirror according to claim 8, characterized in that, The fine-tuning mechanism includes a three-degree-of-freedom precision translation stage and a two-dimensional tilt adjustment platform. Its translation resolution is better than a preset translation resolution threshold, and its angle adjustment resolution is better than a preset angle resolution threshold.

10. The method for controllable clamping of the adhesive layer of a double-sided laminated mirror according to claim 9, characterized in that, The method is applicable to the manufacturing of laminated double-sided mirrors with a predetermined diameter range and an adhesive layer thickness within a preset thickness range, and the entire process is automated.

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