Displacement testing device and displacement testing method

Abstract

The application discloses a displacement testing device and a displacement testing method. The displacement testing device comprises a base, an adjusting support and an adjusting piece. The base is formed with an opening, and a first mounting hole is arranged on the opening edge. An accommodating groove for accommodating a lens is arranged in the base, and a glue groove is arranged on the groove bottom of the accommodating groove. The adjusting support comprises a support body, a suction accessory and a connecting rod connecting the support body and the suction accessory. A strain gauge is attached to the connecting rod. The suction accessory is used for adsorbing the lens. The support body is provided with a second mounting hole corresponding to the first mounting hole. The adjusting piece passes through the second mounting hole and is threadedly connected with the first mounting hole. The adjusting piece can be rotated to adjust the position of the suction accessory along the axial direction of the opening. The displacement testing device can obtain the displacement of the lens through the strain of the strain gauge, can also monitor the displacement change of the lens in real time, and has the advantages of high detection precision.

Description

Technical Field

[0001] This application relates to the field of optical module manufacturing technology, and in particular to a displacement testing device and displacement testing method. Background Technology

[0002] In the manufacturing process of optical modules, such as in virtual reality or augmented reality devices, lenses are mounted onto the lens barrel using photocurable adhesive. After the photocurable adhesive cures, it shrinks, affecting the assembly precision of the lenses. Summary of the Invention

[0003] The main purpose of this application is to propose a displacement testing device and a displacement testing method, which aims to at least improve the technical problem of low assembly accuracy of lenses.

[0004] To achieve the above objectives, according to some embodiments of this application, this application provides a displacement testing device, including a base, an adjusting bracket, and an adjusting member. The base has an opening, and a first mounting hole is provided on the edge of the opening. A receiving groove for accommodating a lens is provided inside the base, and an adhesive groove is provided at the bottom of the receiving groove. The adjusting bracket includes a frame, an adsorption member, and a connecting rod connecting the frame and the adsorption member. A strain gauge is attached to the connecting rod. The adsorption member is used to adsorb the lens. The frame has a second mounting hole corresponding to the first mounting hole. The adjusting member passes through the second mounting hole and is threadedly connected to the first mounting hole. The adjusting member is rotatable to adjust the position of the adsorption member along the axial direction of the opening.

[0005] In some embodiments, the base includes a fixed sub-base and a contoured lens barrel. The fixed sub-base is provided with a receiving cavity and the opening. The contoured lens barrel is disposed in the receiving cavity and is provided with the receiving groove.

[0006] In some embodiments, the opening edge is provided with a positioning groove, the bottom of the positioning groove is provided with the first mounting hole, and the frame is mounted in the positioning groove.

[0007] In some embodiments, the frame includes a center plate and legs distributed around the periphery of the center plate. Each leg includes an arcuate segment and a connecting segment connected to each other. One end of the arcuate segment away from the connecting segment is connected to the center plate. The connecting segment is disposed in the positioning groove and has a second mounting hole. A connecting rod connects the center plate and the adsorption member, and the deformation direction of the connecting rod is consistent with the axial direction of the opening.

[0008] In some embodiments, there are multiple first mounting holes, which are evenly distributed along the edge of the opening. The number of second mounting holes and the number of adjusting members are the same as the number of first mounting holes, and they are connected in a one-to-one correspondence.

[0009] In some embodiments, the displacement testing device further includes a displacement transducer connected to the adjusting member via a signal connection, so as to control the adjustment distance of the adjusting member via the displacement transducer.

[0010] According to some embodiments of this application, this application provides a displacement testing method applied to the displacement testing device described above, the displacement testing method comprising:

[0011] Install the lens into the receiving groove of the base, and inject the preset amount of light-curing adhesive into the glue tank;

[0012] The adsorption element is controlled to adsorb the lens, and the adjustment element is driven to rotate to adjust the position of the adsorption element along the axis of the opening, thereby adjusting the height of the lens and obtaining the first reading of the strain gauge.

[0013] The photocurable adhesive was cured using an ultraviolet light source, and the second reading of the strain gauge was obtained after stabilization.

[0014] The displacement of the lens is obtained based on the first and second readings.

[0015] In some embodiments, the step of controlling the adsorption element to adsorb the lens, driving the adjustment element to rotate to adjust the position of the adsorption element along the axial direction of the opening, thereby adjusting the height of the lens, and obtaining the first reading of the strain gauge includes:

[0016] The adsorption element is controlled to adsorb the lens, and the adjusting element is driven to rotate to adjust the position of the adsorption element along the axial direction of the opening, thereby adjusting the height of the lens until the first reading of the strain gauge is zero.

[0017] In some embodiments, after the steps of mounting the lens in the receiving groove of the base and injecting UV-curable adhesive into the adhesive tank, the method further includes the step of:

[0018] Place the lens and base in a temperature-controlled device for preheating.

[0019] In some embodiments, the ultraviolet light source includes a first sub-light source and a second sub-light source, and the step of curing the photocurable adhesive using the ultraviolet light source includes:

[0020] The first sub-light source is used to cure the photocurable adhesive for the first time at a first preset time and a first preset temperature.

[0021] The photocurable adhesive is cured a second time using the second sub-light source at a second preset time and a second preset temperature.

[0022] Wherein, the first preset time is greater than the second preset time, and the first preset temperature is less than the second preset temperature.

[0023] According to some embodiments of this application, this application provides a displacement testing method applied to the displacement testing device described above, characterized in that the displacement testing method includes:

[0024] Install the lens into the receiving groove of the base, and inject the preset amount of light-curing adhesive into the glue tank;

[0025] Control the movement of the adsorption element to the adsorption lens and obtain the third reading of the strain gauge;

[0026] The photocurable adhesive was cured using an ultraviolet light source. After curing, the fourth reading of the strain gauge after stabilization was obtained.

[0027] The displacement of the lens is obtained based on the third and fourth readings.

[0028] In some embodiments, the ultraviolet light source includes a first sub-light source and a second sub-light source, and the step of curing the photocurable adhesive using the ultraviolet light source includes:

[0029] The first sub-light source is used to cure the photocurable adhesive for the first time at a first preset time and a first preset temperature.

[0030] The photocurable adhesive is cured a second time using the second sub-light source at a second preset time and a second preset temperature.

[0031] Wherein, the first preset time is greater than the second preset time, and the first preset temperature is less than the second preset temperature.

[0032] In the above scheme, the displacement testing device includes a base, an adjusting bracket, and an adjusting component. The base has an opening with a first mounting hole along its edge. A receiving groove for accommodating a lens is provided inside the base, and an adhesive groove is provided at the bottom of the receiving groove. The adjusting bracket includes a frame, an adsorption component, and a connecting rod connecting the frame and the adsorption component. A strain gauge is attached to the connecting rod. The adsorption component is used to adsorb the lens. The frame has a second mounting hole corresponding to the first mounting hole. The adjusting component passes through the second mounting hole and is threadedly connected to the first mounting hole. The adjusting component can rotate to adjust the position of the adsorption component along the axial direction of the opening. By setting the adsorption component to adsorb the lens and recording the strain after the strain gauge adhesive has cured, the displacement of the lens can be obtained. This invention can obtain the displacement of the lens through the strain gauge strain and can also monitor the displacement change of the lens in real time, offering the advantage of high detection accuracy.

[0033] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0035] Figure 1 This is an exploded view of the displacement testing apparatus of some embodiments of this application;

[0036] Figure 2 This is a cross-sectional structural schematic diagram of the displacement testing device according to some embodiments of this application;

[0037] Figure 3 This is a cross-sectional structural schematic diagram of the displacement testing device and lens in some embodiments of this application;

[0038] Figure 4 This is a schematic diagram of the structure of the adjustment bracket of the displacement testing device according to some embodiments of this application from one perspective;

[0039] Figure 5 This is a schematic diagram of the adjustment bracket of the displacement testing device in some embodiments of this application from another perspective;

[0040] Figure 6 This is a schematic flowchart of the displacement testing method according to the first embodiment of this application;

[0041] Figure 7 This is a flowchart illustrating the displacement testing method according to the second embodiment of this application;

[0042] Figure 8 This is a flowchart illustrating the displacement testing method according to the third embodiment of this application;

[0043] Figure 9 This is a flowchart illustrating the displacement testing method according to the fourth embodiment of this application;

[0044] Figure 10 This is a flowchart illustrating the displacement testing method according to the fifth embodiment of this application.

[0045] Explanation of icon numbers:

[0046] 100. Displacement testing device; 200. Lens;

[0047] 1. Base; 11. Fixed sub-base; 111. Receiving cavity; 112. Opening; 113. First mounting hole; 114. Positioning groove; 12. Contouring lens tube; 121. Receiving groove; 122. Glue tank; 2. Adjusting bracket; 21. Frame; 211. Center plate; 212. Support leg; 2121. Arc segment; 2122. Connecting segment; 2221. Second mounting hole; 22. Adsorption component; 23. Connecting rod; 3. Adjusting component; 4. Strain gauge.

[0048] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0049] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0050] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indicator will also change accordingly.

[0051] Furthermore, the use of terms such as "first," "second," etc., in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are feasible to those skilled in the art. If a combination of technical solutions contradicts each other or cannot be implemented, it should be considered that such a combination does not exist and is not within the scope of protection claimed in this application. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0054] The descriptions of directions such as "up", "down", "front", "back", "left", and "right" in this application are based on the directions shown in the figure and are only used to explain the relative positional relationship between the components in the posture shown in the figure. If the specific posture changes, the directional indication will also change accordingly.

[0055] In the manufacturing process of virtual reality or augmented reality devices, lenses need to be mounted onto the lens barrel. However, in practice, it has been found that no matter how precise the alignment is during installation, significant deviations still occur during post-installation inspection.

[0056] After careful research, the applicant discovered that current methods generally employ active alignment technology to assemble optical modules, involving applying adhesive inside the lens barrel to mount the lenses onto the barrel. However, even if the lens placement is perfectly aligned during installation, shrinkage during adhesive curing can cause lens displacement, ultimately leading to assembly deviations.

[0057] Therefore, this application proposes a displacement testing device.

[0058] Reference Figures 1 to 5 According to some embodiments of this application, this application provides a displacement testing device 100, including a base 1, an adjusting bracket 2, and an adjusting member 3. The base 1 has an opening 112, and a first mounting hole 113 is provided on the edge of the opening 112. A receiving groove 121 for accommodating a lens 200 is provided in the base 1, and an adhesive groove 122 is provided at the bottom of the receiving groove 121. The adjusting bracket 2 includes a frame 21, an adsorption member 22, and a connecting rod 23 connecting the frame 21 and the adsorption member 22. A strain gauge 4 is attached to the connecting rod 23. The adsorption member 22 is used to adsorb the lens 200. The frame 21 is provided with a second mounting hole 2221 corresponding to the first mounting hole 113. The adjusting member 3 passes through the second mounting hole 2221 and is threadedly connected to the first mounting hole 113. The adjusting member 3 can rotate to adjust the position of the adsorption member 22 along the axial direction of the opening 112. The strain gauge 4 is used to obtain the relative deformation of the connecting rod. Specifically, the strain gauge 4 is attached to the connecting rod 23 and can deform together with the connecting rod 23.

[0059] It should be noted that the main purpose of the displacement testing device 100 in this application is to measure the displacement of the lens 200 during the adhesive curing process. This allows for adjustment of the lens 200's installation position during actual assembly, ensuring that the final installed lens 200 meets the requirements. The base 1 is the substrate, and it has an opening 112 through which the lens 200 can be placed into the receiving groove 121. The receiving groove 121 contains an adhesive groove 122 to control the adhesive diffusion range. The receiving groove 121 and the adhesive groove 122 are designed to mimic the shape and structure of a lens barrel, aiming to install the lens 200 in an environment similar to an actual lens barrel. By measuring the displacement of the lens 200, the displacement of the lens 200 during actual installation can be obtained. The adjustment bracket 2 includes a frame 21, an adsorption element 22, and a connecting rod 23. A strain gauge 4 is attached to the connecting rod 23. The adsorption element 22 can be used to vacuum adsorb the lens 200. The frame 21 is provided with a second mounting hole 2221 corresponding to the first mounting hole 113. The adjustment element 3 can pass through the second mounting hole 2221 and be threadedly connected to the first mounting hole 113. In a specific embodiment, the adjustment element 3 can be a screw. By rotating the adjustment element 3, it can be moved along its own central axis. The axial direction of the opening 112 is the extension and retraction direction of the strain gauge 4, which is the direction of the central axis of the adjustment element 3. That is, the adjustment element 3 extends or retracts in the first mounting hole 113. Since the base 1 is stationary, the position of the frame 21 can be adjusted, thereby adjusting the position of the adsorption element 22 and the lens 200 adsorbed by the adsorption element 22. During the curing and shrinkage process of the adhesive, a shrinkage force is generated acting on the connecting rod 23, causing the connecting rod 23 to deform. The strain gauge 4, attached to the connecting rod 23, can deform along with the connecting rod 23. Therefore, the relative deformation of the connecting rod 23 can be obtained by reading the relative deformation of the strain gauge. Of course, the adhesive can also be a UV-curing adhesive, a thermosetting adhesive, or a photothermal dual-curing adhesive. The frame 21, the adsorption component 22, and the connecting rod 23 can be manufactured as a single piece and integrated onto a single bracket, reducing the transmission of mechanical errors.

[0060] The applicant also wants to clarify that there is no structure or testing method in the relevant technology for measuring the 200° offset of a lens. Technical personnel typically estimate the shrinkage of the adhesive through manual experience and make repeated adjustments, which is inefficient and difficult to guarantee accuracy. Passive fixing methods are also used, relying on high-precision molds to fix components, but these cannot dynamically monitor the shrinkage process and cannot quantify the relationship between shrinkage stress and displacement. Of course, with the development of software technology, finite element simulation measurement methods are also used, but this predicts shrinkage deformation through simulation, and is limited by model simplification errors and actual process fluctuations, making it difficult to directly guide production.

[0061] In the technical solution of this application, during the actual testing process, the first step is to install the lens 200 in the receiving groove 121, and then inject glue into the glue tank 122. This glue can be a UV-curing glue, and the process is allowed to proceed for 5 seconds to allow the glue to spread initially. The second step involves rotating the driving adjustment component 3 to lower the lens 200 to a certain height. At this point, the strain gauge 4 is zeroed or at a preset reading; zeroing the reading facilitates subsequent calculations. The third step involves irradiating the UV-curing glue with ultraviolet light, continuously monitoring the strain gauge 4 reading until it stabilizes, and recording the strain gauge 4 reading at this point.

[0062] The calculation process for obtaining the 200° displacement of the lens is explained below using the first and second methods respectively. The subsequent steps will also be described in detail.

[0063] The first method involves calculating the adhesive shrinkage force as follows: F = EAe, where E is the elastic modulus of the connecting rod 23 material, A is the cross-sectional area of ​​the sensitive region of strain gauge 4 (i.e., the cross-sectional area of ​​the corresponding connecting rod 23), and e is the change in strain gauge 4 reading. It should be noted that the adhesive shrinkage force also acts on the connecting rod 23, causing it to deform under the force F. The strain gauge 4 reading shows the relative change. Given that the gauge length of strain gauge 4 is L and the actual displacement of lens 200 is Z, we have Z = F * L / E / A = L * e. In this formula, L can be obtained beforehand. In the second step, the preset reading can be set to 0, meaning strain gauge 4 is initially zero. Therefore, e is the reading of strain gauge 4 after ultraviolet irradiation, thus obtaining the displacement of lens 200. In a specific embodiment, the connecting rod 23 can be made of aluminum alloy, E = 70 GPa, and the calibrated cross-sectional area of ​​the strain gauge sensitive region A = 2 mm. 2 The strain gauge length L = 10 mm, and the strain gauge reading change e is dimensionless. The applicant also wants to clarify that this embodiment designs the strain gauge 4 to measure the change in the axial direction, thereby obtaining the displacement of the lens 200 in the axial direction. If horizontal displacement is desired, a horizontal strain gauge 4 can also be used; that is, by increasing the strain gauge array layout, X / Y / Z triaxial displacement can be measured simultaneously, and the calculation method is similar to that described above.

[0064] The second method, based on the known glue shrinkage force, is as follows: F1 = EAe, where E is the elastic modulus of the connecting rod 23 material, A is the cross-sectional area of ​​the sensitive region of strain gauge 4 (i.e., the cross-sectional area of ​​the corresponding connecting rod 23), and e is the change in strain gauge 4 reading. It should be noted that the glue shrinkage force also acts on the connecting rod 23, and the connecting rod 23 can deform under the action of force F1. The strain gauge 4 reading shows the relative change. If the third reading is e1 and the fourth reading is e2, then e = e2 - e1. In some specific embodiments, the third reading can be set to 0, meaning the strain gauge 4 is initially zero; in this case, e is the strain gauge 4 reading e2 after ultraviolet irradiation. Define the actual displacement of lens 200 as h, then h = F1*H / E1 / A1, where H is the height of the glue, E1 is the elastic modulus of the glue, and A1 is the effective cross-sectional area of ​​the glue. H, E1, and A1 can all be measured or obtained directly. F1 can be calculated based on the third and fourth readings of the strain gauge. Thus, the actual displacement of lens 200 can be obtained.

[0065] By setting up the adsorption element 22 to adsorb the lens 200 and recording the strain of the strain gauge 4 after the glue has cured, the displacement of the lens 200 can be obtained. This embodiment can obtain the displacement of the lens 200 through the strain of the strain gauge 4, and can also monitor the displacement change of the lens 200 in real time, which has the advantage of high detection accuracy.

[0066] Reference Figure 1 and Figure 2 In some embodiments, the base 1 includes a fixed sub-base 11 and a contoured lens barrel 12. The fixed sub-base 11 is provided with a receiving cavity 111 and an opening 112. The contoured lens barrel 12 is disposed in the receiving cavity 111 and is provided with a receiving groove 121.

[0067] In actual measurement, a receiving groove 121 and an adhesive groove 122 can be set in the base 1. During testing, only the lens 200 needs to be used. Of course, the base 1 can also be set to include a fixing sub-base 11 and a contour lens barrel 12. The contour lens barrel 12 is detachably connected to the fixing sub-base 11. During testing, the lens barrel of the virtual reality device and the lens 200 can be placed together for testing. Alternatively, different types of contour lens barrels 12 can be replaced according to the type of lens 200, which can be used for testing various types of lenses 200.

[0068] Reference Figure 1 In some embodiments, a positioning groove 114 is provided along the edge of the opening 112, and a first mounting hole 113 is provided at the bottom of the positioning groove 114, and the frame 21 is mounted in the positioning groove 114.

[0069] The opening 112 can be a circular opening, and the edge of the opening 112 refers to its outer edge. The positioning groove 114 is used for positioning, which facilitates the installation of the frame 21 on the base 1, specifically on the fixed sub-base 11. The frame 21 is provided with a second mounting hole 2221. After the frame 21 is positioned and installed in the positioning groove 114, it can be installed on the first mounting hole 113 by means of an adjusting member 3 through the second mounting hole 2221 via a threaded connection, and the position of the lens 200 can be adjusted along the axis of the opening 112.

[0070] Reference Figure 4 and Figure 5 In some embodiments, the frame 21 includes a center plate 211 and support legs 212 distributed around the periphery of the center plate 211. The support legs 212 include an arc-shaped segment 2121 and a connecting segment 2122 connected to each other. The end of the arc-shaped segment 2121 away from the connecting segment 2122 is connected to the center plate 211. The connecting segment 2122 is disposed in the positioning groove 114 and is provided with a second mounting hole 2221. The connecting rod 23 connects the center plate 211 and the adsorption member 22. The deformation direction of the connecting rod 23 is consistent with the axial direction of the opening 112.

[0071] Regarding the specific structure of the frame 21, the frame 21 may include a center plate 211 and support legs 212. The center plate 211 is a circular plate, and the support legs 212 are evenly distributed around the outer periphery of the center plate 211. Specifically, the support legs 212 include an arc-shaped segment 2121 and a connecting segment 2122. The arc-shaped segment 2121 may be arched, and the connecting plate may be plate-shaped, matching the shape of the positioning groove 114. The connecting plate may be precisely positioned within the positioning groove 114, and the first mounting hole 113 is provided within the positioning groove 114. The connecting rod 23 is arranged along the axial direction of the opening 112, thereby enabling the strain gauge to measure the displacement deviation of the lens 200 in the axial direction.

[0072] In some embodiments, there are multiple first mounting holes 113, which are evenly distributed along the edge of the opening 112. The number of second mounting holes 2221 and adjusting members 3 are the same as the number of first mounting holes 113, and they are connected in a one-to-one correspondence.

[0073] Each first mounting hole 113 corresponds to a second mounting hole 2221, and each first mounting hole 113 corresponds to an adjusting member 3. The adjusting member 3 moves along its own central axis by rotating within the first mounting hole 113. During the movement of the adjusting member 3, the frame 21 moves, which in turn moves the lens 200 mounted on the adsorption member 22, thus achieving the zeroing adjustment of the strain gauge 4 in the measurement step. It should be noted that the adjustment of multiple adjusting members 3 is independent of each other during the adjustment process.

[0074] In some embodiments, the displacement testing device 100 further includes a displacement transducer connected to the adjustment member 3 via a signal, so as to control the adjustment distance of the adjustment member 3 via the displacement transducer.

[0075] The displacement device here can be a fiber optic ruler or a laser displacement meter, capable of measuring the adjustment distance of the adjusting element 3. Of course, in other embodiments, the adjusting element 3 itself includes a driving element, which can achieve precise movement of the adjusting element 3 by means of linkage with the displacement device, so that the movement accuracy of the adjusting element 3 is within 5μm.

[0076] According to some embodiments of this application, this application provides a displacement testing device 100, including a base 1, an adjusting bracket 2, an adjusting member 3, and a displacement device. The base 1 has an opening 112, and a first mounting hole 113 is provided on the edge of the opening 112. A receiving groove 121 for accommodating a lens 200 is provided inside the base 1, and an adhesive groove 122 is provided at the bottom of the receiving groove 121. The adjusting bracket 2 includes a frame 21, an adsorption member 22, and a connecting rod 23 connecting the frame 21 and the adsorption member 22. A strain gauge 4 is attached to the connecting rod 23. The adsorption member 22 is used to adsorb the lens 200. The frame 21 is provided with a second mounting hole 2221 corresponding to the first mounting hole 113. The adjusting member 3 passes through the second mounting hole 2221 and is threadedly connected to the first mounting hole 113. The adjusting member 3 can rotate to adjust the position of the adsorption member 22 along the axial direction of the opening 112. A positioning groove 114 is provided along the edge of the opening 112, and a first mounting hole 113 is provided at the bottom of the positioning groove 114. The frame 21 includes a center plate 211 and support legs 212 distributed around the periphery of the center plate 211. The support legs 212 include an arc-shaped segment 2121 and a connecting segment 2122 connected to each other. The end of the arc-shaped segment 2121 away from the connecting segment 2122 is connected to the center plate 211. The connecting segment 2122 is disposed in the positioning groove 114 and has a second mounting hole 2221. The connecting rod 23 connects the center plate 211 and the adsorption member 22. The extension and contraction direction of the strain gauge 4 is consistent with the axial direction of the opening 112. The displacement device is signal-connected to the adjustment member 3 to control the adjustment distance of the adjustment member 3. This embodiment can obtain the displacement of the lens 200 through the strain of the strain gauge 4, and can also monitor the displacement change of the lens 200 in real time, which has the advantage of high detection accuracy.

[0077] This application provides two different displacement testing methods, the first of which corresponds to... Figures 6 to 9 The second testing method corresponds to Figure 10 And the corresponding text description.

[0078] First, the first testing method will be explained in detail. (Refer to...) Figure 6 , Figure 6This is a flowchart illustrating the displacement testing method according to the first embodiment of this application. This application provides a displacement testing method applied to the aforementioned displacement testing device 100. The displacement testing method includes:

[0079] S100, the lens 200 is installed in the receiving groove 121 of the base 1, and a preset amount of light-curing adhesive is injected into the adhesive tank 122.

[0080] The displacement testing device 100 includes a base 1, an adjusting bracket 2, and an adjusting member 3. The base 1 has an opening 112, and a first mounting hole 113 is provided on the edge of the opening 112. The base 1 has a receiving groove 121 for accommodating a lens 200, and a glue groove 122 is provided at the bottom of the receiving groove 121. The adjusting bracket 2 includes a frame 21, an adsorption member 22, and a connecting rod 23 connecting the frame 21 and the adsorption member 22. A strain gauge 4 is attached to the connecting rod 23. The adsorption member 22 is used to adsorb the lens 200. The frame 21 has a second mounting hole 2221 corresponding to the first mounting hole 113. The adjusting member 3 passes through the second mounting hole 2221 and is threadedly connected to the first mounting hole 113. The adjusting member 3 can rotate to adjust the position of the adsorption member 22 along the axial direction of the opening 112. The base 1 is provided with a receiving groove 121, and an adhesive tank 122 is provided inside the receiving groove 121. The amount of adhesive injected can be precisely controlled by an adhesive dispensing machine. The adhesive tank 122 is used to control the flow path of the adhesive. It should be noted that the adhesive used here is a light-curing adhesive, which can be cured and shaped under the irradiation of a UV lamp to bond the lens 200 to the receiving groove 121.

[0081] S200, control the adsorption element 22 to adsorb the lens 200, drive the adjustment element 3 to rotate to adjust the position of the adsorption element 22 along the axial direction of the opening 112, thereby adjusting the height of the lens 200 and obtaining the first reading of the strain gauge 4.

[0082] The adsorption member 22 can adsorb the lens 200 through vacuum adsorption. The lens 200 is held in place so that the movement of the adsorption member 22 can be controlled by the adjusting member 3, allowing the lens 200 to move along with it. Since the adjusting member 3 is adjusted along the axial direction of the opening 112, the height of the lens 200 can be adjusted accordingly. If the lens 200 abuts against the receiving groove 121, a certain force will be applied, causing the strain gauge 4 to deform and display a reading. Therefore, the first reading of the strain gauge 4 can be adjusted by adjusting the height of the lens 200.

[0083] S300 uses an ultraviolet light source to cure the photocurable adhesive and obtains the second reading of strain gauge 4 after it has stabilized.

[0084] When the UV light source is used to irradiate the photocurable adhesive, the adhesive will shrink during the curing process. During the shrinkage process, the lens 200 will move, which will cause the reading of strain gauge 4 to change. After the reading of strain gauge 4 stabilizes, the second reading of strain gauge 4 can be recorded.

[0085] S400, the displacement of lens 200 is obtained based on the first reading and the second reading.

[0086] The change in the strain gauge 4 reading is caused by the expansion and contraction of the connecting rod 23 due to the displacement of the lens 200. Therefore, through formula conversion, the change in the strain gauge 4 reading can reflect the displacement of the lens 200. In this way, the measurement of the displacement of the lens 200 can be converted into the change in the strain gauge 4 reading, and the change in the strain gauge 4 reading can be directly read, thus enabling the quantitative measurement of the displacement of the lens 200.

[0087] In the above embodiments of the present invention, the lens 200 is installed in the receiving groove 121 of the base 1, a preset amount of photocurable adhesive is injected into the adhesive tank 122, the adsorption member 22 is controlled to adsorb the lens 200, the adjusting member 3 is driven to rotate to adjust the position of the adsorption member 22 along the axial direction of the opening 112, thereby adjusting the height of the lens 200, the first reading of the strain gauge 4 is obtained, the photocurable adhesive is cured by an ultraviolet light source, the second reading of the strain gauge 4 is obtained after stabilization, and the displacement of the lens 200 is obtained based on the first and second readings. This not only allows for the quantitative acquisition of the displacement of the lens 200, but also allows for the detection of the offset process of the lens 200 through the change of the strain gauge 4 reading, which has the advantage of high detection accuracy.

[0088] Reference Figure 7 , Figure 7 This is a flowchart illustrating the displacement testing method of the second embodiment of this application. Step S200 includes:

[0089] S201, control the adsorption element 22 to adsorb the lens 200, drive the adjustment element 3 to rotate to adjust the position of the adsorption element 22 along the axial direction of the opening 112, and then adjust the height of the lens 200 until the first reading of the strain gauge 4 is zero.

[0090] In this embodiment, the first reading is set to 0, primarily to simplify calculations. Specifically, the calculation process for the displacement of lens 200 is as follows: The glue shrinkage force is calculated as follows: F = EAe, where E is the elastic modulus of the connecting rod 23 material, A is the cross-sectional area of ​​the sensitive region of strain gauge 4, and e is the change in the strain gauge 4 reading. It should be noted that the strain gauge 4 reading displays a relative change. The gauge length of strain gauge 4 is L, and the actual displacement of lens 200 is Z. Therefore, Z = F*L / E / A = L*e. In this formula, L can be obtained in advance. In the second step, the preset reading can be set to 0, meaning strain gauge 4 is initially zero. Then e is the reading of strain gauge 4 after ultraviolet irradiation, thus obtaining the displacement of lens 200. Furthermore, the applicant wants to clarify that this embodiment designs the change in strain gauge 4 along the axial direction, thereby obtaining the axial displacement of lens 200. If the horizontal displacement is desired, a horizontal strain gauge 4 can also be used, and the calculation method is similar to the above.

[0091] Reference Figure 8 , Figure 8 This is a flowchart illustrating the displacement testing method according to the third embodiment of this application. After step S100, the method further includes the following step:

[0092] S110, Place the lens 200 and base 1 in a constant temperature device for preheating.

[0093] Since temperature variations can affect the curing of the adhesive, which directly influences the offset of lens 200 and thus the final test results, preheating of lens 200 and base 1 to their normal operating temperature before adhesive injection and curing is recommended. Alternatively, lens 200 and base 1 can be placed in a temperature-controlled device, with subsequent dispensing and curing completed within this device. This reduces the impact of temperature changes, thereby minimizing lens 200 offset and improving test accuracy.

[0094] Reference Figure 9 , Figure 9 This is a flowchart illustrating the displacement testing method according to the fourth embodiment of this application. Step S300 includes:

[0095] S301, the first sub-light source is used to cure the photocurable adhesive for the first time at a first preset time and a first preset temperature;

[0096] S302, a second sub-light source is used to cure the photocurable adhesive for the second time at a second preset time and a second preset temperature; wherein, the first preset time is greater than the second preset time and the first preset temperature is less than the second preset temperature.

[0097] This embodiment employs a step-by-step curing process to avoid large volume changes caused by a single curing step, which could lead to excessive deviations in test results due to the instantaneous movement of lens 200. Specifically, the inaccuracy caused by the instantaneous movement of lens 200 can be reduced by reasonably controlling the light source intensity, time, and curing temperature. In the first curing step, the first preset time can be set relatively long, and the first preset temperature can be set relatively low, allowing the adhesive to slowly reach the first preset temperature and cure slowly. In the second curing step, since the adhesive has already reached a certain temperature, and considering efficiency, the second preset time can be set relatively short, and the second preset temperature can be set relatively high.

[0098] Next, the second testing method will be explained in detail. (Refer to...) Figure 10 , Figure 10 This is a flowchart illustrating the displacement testing method according to the fifth embodiment of this application. This application provides a displacement testing method applied to the aforementioned displacement testing device 100. The displacement testing method includes:

[0099] S001, install the lens 200 in the receiving groove 121 of the base 1, and inject a preset amount of light-curing adhesive into the adhesive tank 122.

[0100] The displacement testing device 100 includes a base 1, an adjusting bracket 2, and an adjusting member 3. The base 1 has an opening 112, and a first mounting hole 113 is provided on the edge of the opening 112. The base 1 has a receiving groove 121 for accommodating a lens 200, and a glue groove 122 is provided at the bottom of the receiving groove 121. The adjusting bracket 2 includes a frame 21, an adsorption member 22, and a connecting rod 23 connecting the frame 21 and the adsorption member 22. A strain gauge 4 is attached to the connecting rod 23. The adsorption member 22 is used to adsorb the lens 200. The frame 21 has a second mounting hole 2221 corresponding to the first mounting hole 113. The adjusting member 3 passes through the second mounting hole 2221 and is threadedly connected to the first mounting hole 113. The adjusting member 3 can rotate to adjust the position of the adsorption member 22 along the axial direction of the opening 112. The base 1 is provided with a receiving groove 121, and an adhesive tank 122 is provided inside the receiving groove 121. The amount of adhesive injected can be precisely controlled by an adhesive dispensing machine. The adhesive tank 122 is used to control the flow path of the adhesive. It should be noted that the adhesive used here is a light-curing adhesive, which can be cured and shaped under the irradiation of a UV lamp to bond the lens 200 to the receiving groove 121.

[0101] S002, control the adsorption element 22 to move the adsorption lens 200 and obtain the third reading of the strain gauge;

[0102] The adsorption element 22 can be moved to the adsorption lens 200 by an external drive to obtain the third reading of the strain gauge 4. At this time, due to the possible pressure between the adsorption element 22 and the lens 200, the strain gauge 4 will deform and show a reading. In a specific embodiment, the adsorption element 22 can be controlled by the external drive so that it just adsorbs the lens 200, the strain gauge 4 has no strain, and the third reading is 0. This can reduce the amount of subsequent calculation and also help improve the detection accuracy.

[0103] S003, UV light source is used to cure the photocurable adhesive. After curing, the fourth reading of strain gauge 4 after stabilization is obtained.

[0104] Unlike the first method, in this embodiment, the adsorption element 22 remains adsorbed onto the lens 200 throughout the curing process. During curing, the shrinkage of the adhesive exerts a contraction force on the lens 200, causing the lens 200 to pull on the adsorption element 22 and the connecting rod 23. The connecting rod 23 deforms under this force, causing a change in the reading of the strain gauge 4 adsorbed on the connecting rod 23. The term "stabilized" here refers to the period after curing is complete, or after a certain time following curing, when the reading of the strain gauge 4 no longer changes, and then a fourth reading of the strain gauge 4 is taken.

[0105] S004, obtain the displacement of lens 200 based on the third and fourth readings.

[0106] The calculation process for obtaining the 200° displacement of the lens is explained below. It is known that the glue shrinkage force is calculated as follows: F1 = EAe, where E is the elastic modulus of the connecting rod 23 material, A is the cross-sectional area of ​​the sensitive region of strain gauge 4 (i.e., the cross-sectional area of ​​the corresponding connecting rod 23), and e is the change in strain gauge 4 reading. It should be noted that the glue shrinkage force also acts on the connecting rod 23. Under the action of force F1, the connecting rod 23 can deform, and the strain gauge 4 reading shows the relative change. If the third reading is e1 and the fourth reading is e2, then e = e2 - e1. In some specific embodiments, the third reading can be set to 0, meaning that the strain gauge 4 is initially zero. In this case, e is the reading e2 of the strain gauge 4 after ultraviolet irradiation. Define the actual displacement of lens 200 as h, then h = F1*H / E1 / A1, where H is the height of the glue, E1 is the elastic modulus of the glue, and A1 is the effective cross-sectional area of ​​the glue. H, E1, and A1 can all be measured or obtained directly. F1 can be calculated based on the third and fourth readings of the strain gauge. Thus, the actual displacement of lens 200 can be obtained.

[0107] In the above embodiments of the present invention, the lens 200 is installed in the receiving groove 121 of the base 1, a preset amount of photocurable adhesive is injected into the adhesive tank 122, the adsorption member 22 is controlled to adsorb the lens 200, the third reading of the strain gauge 4 is obtained, the photocurable adhesive is cured by an ultraviolet light source, and the fourth reading of the strain gauge 4 is obtained after stabilization. The displacement of the lens 200 is obtained based on the third and fourth readings. Not only can the displacement of the lens 200 be quantitatively obtained, but the displacement process of the lens 200 can also be detected by the change of the strain gauge 4 reading, which has the advantage of high detection accuracy.

[0108] In some embodiments, the ultraviolet light source includes a first sub-light source and a second sub-light source, and the step of curing the photocurable adhesive using the ultraviolet light source includes:

[0109] The first sub-light source is used to cure the photocurable adhesive for the first time at a first preset time and a first preset temperature.

[0110] A second sub-light source is used to cure the photocurable adhesive a second time at a second preset time and a second preset temperature.

[0111] The first preset time is longer than the second preset time, and the first preset temperature is shorter than the second preset temperature.

[0112] This embodiment employs a step-by-step curing process to avoid large volume changes caused by a single curing step, which could lead to excessive deviations in test results due to the instantaneous movement of lens 200. Specifically, the inaccuracy caused by the instantaneous movement of lens 200 can be reduced by reasonably controlling the light source intensity, time, and curing temperature. In the first curing step, the first preset time can be set relatively long, and the first preset temperature can be set relatively low, allowing the adhesive to slowly reach the first preset temperature and cure slowly. In the second curing step, since the adhesive has already reached a certain temperature, and considering efficiency, the second preset time can be set relatively short, and the second preset temperature can be set relatively high.

[0113] In addition, the lens 200 and base 1 can be preheated in a temperature-controlled device. Since temperature changes can affect the curing of the adhesive, which directly influences the offset of the lens 200, leading to deviations in the final test results, it is advisable to preheat the lens 200 and base 1 to their normal operating temperature before applying and curing the adhesive. Alternatively, the lens 200 and base 1 can be placed directly in a temperature-controlled device, with subsequent dispensing and curing completed within this device. This reduces the impact of temperature changes, thereby minimizing lens 200 offset and improving test accuracy.

[0114] The above description is merely an optional embodiment of this application and does not limit the scope of protection of this application. Any equivalent structural transformations made based on the content of this application's specification and drawings under the concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of this application.

Claims

1. A displacement testing method, applied to a displacement testing device, characterized in that, The displacement testing device includes a base, an adjusting bracket, and an adjusting component. The base has an opening, and a first mounting hole is provided on the edge of the opening. A receiving groove for accommodating a lens is provided inside the base, and an adhesive groove is provided at the bottom of the receiving groove. The adjusting bracket includes a frame, an adsorption component, and a connecting rod connecting the frame and the adsorption component. A strain gauge is attached to the connecting rod. The adsorption component is used to adsorb the lens. The frame has a second mounting hole corresponding to the first mounting hole. The adjusting component passes through the second mounting hole and is threadedly connected to the first mounting hole. The adjusting component is rotatable to adjust the position of the adsorption component along the axial direction of the opening. The displacement testing method includes: Install the lens into the receiving groove of the base, and inject the preset amount of light-curing adhesive into the glue tank; The adsorption element is controlled to adsorb the lens, and the adjustment element is driven to rotate to adjust the position of the adsorption element along the axis of the opening, thereby adjusting the height of the lens and obtaining the first reading of the strain gauge. The photocurable adhesive was cured using an ultraviolet light source, and the second reading of the strain gauge was obtained after stabilization. The displacement of the lens is obtained based on the first and second readings: Z== L e, where Z represents the displacement of the lens, L represents the gauge length of the strain gauge, and e represents the change in the strain gauge reading, i.e., e = second reading - first reading.

2. The displacement testing method according to claim 1, characterized in that, The steps of controlling the adsorption element to adsorb the lens, driving the adjustment element to rotate to adjust the position of the adsorption element along the axial direction of the opening, thereby adjusting the height of the lens, and obtaining the first reading of the strain gauge include: The adsorption element is controlled to adsorb the lens, and the adjustment element is driven to rotate to adjust the position of the adsorption element along the axial direction of the opening, thereby adjusting the height of the lens until the first reading of the strain gauge is zero.

3. The displacement testing method according to claim 1, characterized in that, After the steps of mounting the lens in the receiving groove of the base and injecting UV-curable adhesive into the adhesive tank, the method further includes the following steps: Place the lens and base in a temperature-controlled device for preheating.

4. The displacement testing method according to any one of claims 1 to 3, characterized in that, The ultraviolet light source includes a first sub-light source and a second sub-light source, and the step of using the ultraviolet light source to cure the photocurable adhesive includes: The first sub-light source is used to cure the photocurable adhesive for the first time at a first preset time and a first preset temperature. The photocurable adhesive is cured a second time using the second sub-light source at a second preset time and a second preset temperature. Wherein, the first preset time is greater than the second preset time, and the first preset temperature is less than the second preset temperature.

5. The displacement testing method according to claim 1, characterized in that, The base includes a fixed sub-base and a contoured lens barrel. The fixed sub-base is provided with a receiving cavity and the opening. The contoured lens barrel is disposed in the receiving cavity and is provided with the receiving groove.

6. The displacement testing method according to claim 1, characterized in that, The opening edge is provided with a positioning groove, and the bottom of the positioning groove is provided with the first mounting hole. The frame is installed in the positioning groove.

7. The displacement testing method according to claim 6, characterized in that, The frame includes a center plate and support legs distributed along the periphery of the center plate. Each support leg includes an arc-shaped segment and a connecting segment connected to each other. The end of the arc-shaped segment away from the connecting segment is connected to the center plate. The connecting segment is disposed in the positioning groove and has a second mounting hole. The connecting rod connects the center plate and the adsorption member. The deformation direction of the connecting rod is consistent with the axial direction of the opening.

8. The displacement testing method according to claim 1, characterized in that, The number of first mounting holes is multiple, and the multiple first mounting holes are evenly distributed along the edge of the opening. The number of second mounting holes and the number of adjusting members are the same as the number of first mounting holes, and the first mounting holes, the second mounting holes and the adjusting members are connected in a one-to-one correspondence.

9. The displacement testing method according to claim 1, characterized in that, The displacement testing device further includes a displacement sensor, which is signal-connected to the adjusting member to control the adjustment distance of the adjusting member.

10. A displacement testing method, applied to a displacement testing device, characterized in that, The displacement testing device includes a base, an adjusting bracket, and an adjusting component. The base has an opening, and a first mounting hole is provided on the edge of the opening. A receiving groove for accommodating a lens is provided inside the base, and an adhesive groove is provided at the bottom of the receiving groove. The adjusting bracket includes a frame, an adsorption component, and a connecting rod connecting the frame and the adsorption component. A strain gauge is attached to the connecting rod. The adsorption component is used to adsorb the lens. The frame has a second mounting hole corresponding to the first mounting hole. The adjusting component passes through the second mounting hole and is threadedly connected to the first mounting hole. The adjusting component is rotatable to adjust the position of the adsorption component along the axial direction of the opening. The displacement testing method includes: Install the lens into the receiving groove of the base, and inject the preset amount of light-curing adhesive into the glue tank; Control the movement of the adsorption element to the adsorption lens and obtain the third reading of the strain gauge; The photocurable adhesive was cured using an ultraviolet light source. After curing, the fourth reading of the strain gauge after stabilization was obtained. The displacement of the lens is obtained based on the third and fourth readings; Z== L e, where Z represents the displacement of the lens, L represents the gauge length of the strain gauge, and e represents the change in the strain gauge reading, i.e., e = fourth reading - third reading.

11. The displacement testing method according to claim 10, characterized in that, The ultraviolet light source includes a first sub-light source and a second sub-light source, and the step of using the ultraviolet light source to cure the photocurable adhesive includes: The first sub-light source is used to cure the photocurable adhesive for the first time at a first preset time and a first preset temperature. The photocurable adhesive is cured a second time using the second sub-light source at a second preset time and a second preset temperature. Wherein, the first preset time is greater than the second preset time, and the first preset temperature is less than the second preset temperature.

12. The displacement testing method according to claim 10, characterized in that, The base includes a fixed sub-base and a contoured lens barrel. The fixed sub-base is provided with a receiving cavity and the opening. The contoured lens barrel is disposed in the receiving cavity and is provided with the receiving groove.

13. The displacement testing method according to claim 10, characterized in that, The opening edge is provided with a positioning groove, and the bottom of the positioning groove is provided with the first mounting hole. The frame is installed in the positioning groove.

14. The displacement testing method according to claim 13, characterized in that, The frame includes a center plate and support legs distributed along the periphery of the center plate. Each support leg includes an arc-shaped segment and a connecting segment connected to each other. The end of the arc-shaped segment away from the connecting segment is connected to the center plate. The connecting segment is disposed in the positioning groove and has a second mounting hole. The connecting rod connects the center plate and the adsorption member. The deformation direction of the connecting rod is consistent with the axial direction of the opening.

15. The displacement testing method according to claim 10, characterized in that, The number of first mounting holes is multiple, and the multiple first mounting holes are evenly distributed along the edge of the opening. The number of second mounting holes and the number of adjusting members are the same as the number of first mounting holes, and the first mounting holes, the second mounting holes and the adjusting members are connected in a one-to-one correspondence.

16. The displacement testing method according to claim 10, characterized in that, The displacement testing device further includes a displacement sensor, which is signal-connected to the adjusting member to control the adjustment distance of the adjusting member.

Images