Displacement testing device and displacement testing method

Abstract

The invention discloses a displacement testing device and a displacement testing method, the displacement testing device comprises a base, an adjusting support and an adjusting piece, an opening is formed in the base, a first mounting hole is formed in the edge of the opening, a containing groove for containing a lens is formed in the base, and a glue groove is formed in the groove bottom of the containing groove; the adjusting bracket comprises a bracket body, an adsorption piece and a connecting rod for connecting the bracket body and the adsorption piece, a strain gauge is attached to the connecting rod, the adsorption piece is used for adsorbing the lens, and the bracket body is provided with a second mounting hole corresponding to the first mounting hole; the adjusting piece penetrates through the second mounting hole and is in threaded connection with the first mounting hole, and the adjusting piece can rotate to adjust the position of the adsorption piece in the axial direction of the opening. The displacement testing device can obtain the displacement of the lens through the dependent variable of the strain gauge, can monitor the displacement change of the lens in real time, and has the advantage of high detection precision.

Description

Technical Field

[0001] The present application relates to the technical field of optical module manufacturing, and in particular to a displacement testing device and a displacement testing method. Background Art

[0002] During the manufacturing process of optical modules, such as those used in virtual reality or augmented reality devices, lenses are mounted on the lens barrel using photocuring adhesive. The photocuring adhesive shrinks after curing, affecting the assembly accuracy 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, aiming to at least improve the technical problem of low assembly accuracy of lenses.

[0004] To achieve the above-mentioned purpose, according to some embodiments of the present application, the present application provides a displacement testing device, including a base, an adjustment bracket and an adjustment member, the base is formed with an opening, a first mounting hole is provided on the edge of the opening, a receiving groove for accommodating a lens is provided in the base, and a glue groove is provided at the bottom of the receiving groove; the adjustment bracket includes a frame body, an adsorption member and a connecting rod connecting the frame body and the adsorption member, a strain gauge is attached to the connecting rod, the adsorption member is used to adsorb the lens, and the frame body is provided with a second mounting hole corresponding to the first mounting hole; the adjustment member passes through the second mounting hole and is threadedly connected to the first mounting hole, and the adjustment member can be rotated 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 provided in the receiving cavity, and the contoured lens barrel is provided with the receiving groove.

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

[0007] In some embodiments, the frame includes a center plate and support legs distributed along the periphery of the center plate, the support legs include arc segments and connecting segments connected to each other, the end of the arc segment away from the connecting segment is connected to the center plate, the connecting segment is arranged in the positioning groove, the connecting segment is provided with the second mounting hole, the 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, and the multiple first mounting holes are evenly distributed along the edge of the opening. The number of the second mounting holes and the adjusting members is the same as the number of the first mounting holes, and they are connected one-to-one.

[0009] In some embodiments, the displacement testing device further includes a displacer, which is signal-connected to the adjusting member so as to control the adjustment distance of the adjusting member through the displacer.

[0010] According to some embodiments of the present application, the present application provides a displacement testing method, which is applied to the displacement testing device described above. The displacement testing method includes:

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

[0012] Controlling the adsorption member to adsorb the lens, driving the adjustment member to rotate to adjust the position of the adsorption member along the axial direction of the opening, thereby adjusting the height of the lens, and obtaining a first reading of the strain gauge;

[0013] The light-curing adhesive is cured using an ultraviolet light source to obtain a second reading after the strain gauge is stabilized.

[0014] The displacement of the lens is obtained according to the first reading and the second reading.

[0015] In some embodiments, the step of controlling the adsorption member to adsorb the lens and driving the adjustment member to rotate to adjust the position of the adsorption member 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] Control the adsorption member to adsorb the lens, drive the adjustment member to rotate to adjust the position of the adsorption member along the axial direction of the opening, and then adjust the height of the lens until the first reading of the strain gauge is zero

[0017] In some embodiments, after the steps of installing the lens in the receiving groove of the base and injecting light-curing glue into the glue groove, the method further includes the following steps:

[0018] Place the lens and base in a constant temperature device to preheat.

[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 light-curing adhesive using the ultraviolet light source includes:

[0020] Using the first sub-light source to perform a first curing of the light-curing adhesive at a first preset time and a first preset temperature;

[0021] curing the light-curing adhesive for a second time at a second preset time and a second preset temperature using the second sub-light source;

[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 the present application, the present application provides a displacement testing method, which is applied to the above-mentioned displacement testing device, characterized in that the displacement testing method includes:

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

[0025] controlling the adsorption member to move and adsorb the lens to obtain a third reading of the strain gauge;

[0026] Curing the light-curing adhesive using an ultraviolet light source, and after the curing is completed, obtaining a fourth reading of the strain gauge after stabilization;

[0027] The displacement of the lens is obtained according to the third reading and the fourth reading.

[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 light-curing adhesive using the ultraviolet light source includes:

[0029] Using the first sub-light source to perform a first curing of the light-curing adhesive at a first preset time and a first preset temperature;

[0030] curing the light-curing adhesive for a second time at a second preset time and a second preset temperature using the second sub-light source;

[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 adjustment bracket and an adjustment member. The base is formed with an opening, and a first mounting hole is provided on the edge of the opening. A receiving groove for accommodating a lens is provided in the base, and a glue groove is provided at the bottom of the receiving groove. The adjustment bracket includes a frame, an adsorbent and a connecting rod connecting the frame and the adsorbent. A strain gauge is attached to the connecting rod. The adsorbent is used to adsorb the lens, and the frame is provided with a second mounting hole corresponding to the first mounting hole. The adjustment member passes through the second mounting hole and is threadedly connected to the first mounting hole. The adjustment member can be rotated to adjust the position of the adsorbent along the axial direction of the opening. By setting the adsorbent to adsorb the lens and recording the strain amount after the strain gauge glue is cured, the displacement amount of the lens can be obtained. This invention can obtain the displacement of the lens through the strain amount of the strain gauge, and can also monitor the displacement change of the lens in real time, with the advantage of high detection accuracy.

[0033] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0035] Figure 1 This is an exploded view of a displacement testing device according to some embodiments of the present application;

[0036] Figure 2 Schematic diagram of the cross-sectional structure of the displacement testing device according to some embodiments of the present application;

[0037] Figure 3 Schematic diagram of the cross-sectional structure of the displacement testing device and lens in some embodiments of the present application;

[0038] Figure 4 A schematic structural diagram of an adjustment bracket of a displacement testing device according to some embodiments of the present application from one perspective;

[0039] Figure 5 This is a schematic structural diagram of an adjustment bracket of a displacement testing device according to some embodiments of the present application from another perspective;

[0040] Figure 6 This is a flow chart of the displacement testing method according to the first embodiment of the present application;

[0041] Figure 7 This is a flow chart of a displacement testing method according to the second embodiment of the present application;

[0042] Figure 8 This is a flow chart of a displacement testing method according to the third embodiment of the present application;

[0043] Figure 9 This is a flow chart of a displacement testing method according to a fourth embodiment of the present application;

[0044] Figure 10 This is a flow chart of the displacement testing method according to the fifth embodiment of the present application.

[0045] Description of Figure Numbers:

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

[0047] 1. Base; 11. Fixed sub-base; 111. Accommodating cavity; 112. Opening; 113. First mounting hole; 114. Positioning groove; 12. Contour lens barrel; 121. Accommodating groove; 122. Glue groove; 2. Adjustment bracket; 21. Frame; 211. Center plate; 212. Leg; 2121. Arc segment; 2122. Connecting segment; 2221. Second mounting hole; 22. Adsorption member; 23. Connecting rod; 3. Adjustment member; 4. Strain gauge.

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

[0049] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in this embodiment. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0050] It should be noted that all directional indications in this embodiment (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0051] In addition, the terms "first," "second," and so on, used in this application are for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0052] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] In addition, the technical solutions of the various embodiments of this application may be combined with each other, but this must be based on the fact that they can be implemented by a person of ordinary skill in the art. If the combination of technical solutions is mutually inconsistent or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this application. It should be understood that the specific embodiments described herein are only used to explain 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] During the manufacturing process of virtual reality or augmented reality devices, lenses need to be mounted on the lens barrel. However, in actual operation, it is found that no matter how precise the alignment during installation, there will still be large deviations during post-installation inspection.

[0056] After careful research, the applicant discovered that active alignment technology is currently commonly used to assemble optical modules, whereby lenses are mounted to the lens barrel by applying glue inside the lens barrel. However, even when the lens is positioned exactly as required during installation, shrinkage during the glue curing process can cause the lens to shift, ultimately resulting in deviations in the lens assembly.

[0057] To this end, the present application proposes a displacement testing device.

[0058] Reference Figures 1 to 5 According to some embodiments of the present application, the present application provides a displacement testing device 100, including a base 1, an adjustment bracket 2 and an adjustment member 3, the base 1 is formed with an opening 112, a first mounting hole 113 is provided on the edge of the opening 112, a receiving groove 121 for accommodating the lens 200 is provided in the base 1, and a glue groove 122 is provided at the bottom of the receiving groove 121; the adjustment bracket 2 includes a frame body 21, an adsorption member 22 and a connecting rod 23 connecting the frame body 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 body 21 is provided with a second mounting hole 2221 corresponding to the first mounting hole 113; the adjustment member 3 passes through the second mounting hole 2221 and is threadedly connected to the first mounting hole 113, and the adjustment member 3 can be rotated 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 undergo the same deformation as the connecting rod 23 .

[0059] It should be noted that the main purpose of the displacement testing device 100 of the present application is to measure the displacement of the lens 200 during the glue curing process, so that the installation position of the lens 200 can be adjusted according to the displacement during the actual assembly process to ensure that the final installed position of the lens 200 meets the requirements. The base 1 is the base part, and the base 1 is formed with an opening 112. The lens 200 can be placed in the receiving groove 121 through the opening 112. The receiving groove 121 is provided with a glue groove 122 to control the diffusion range of the glue. The receiving groove 121 and the glue groove 122 are made to imitate the shape and structure of the lens barrel. The purpose is to install the lens 200 in an environment similar to the actual lens barrel. By measuring the displacement of the lens 200, the displacement of the lens 200 during the actual installation process can be obtained. The adjustment bracket 2 includes a frame 21, an adsorbent 22 and a connecting rod 23. A strain gauge 4 is attached to the connecting rod 23. The adsorbent 22 can be used for vacuum adsorption of the lens 200. A second mounting hole 2221 corresponding to the first mounting hole 113 is provided on the frame 21. The adjustment member 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 member 3 can be a screw, which is moved along its own central axis by rotating the adjustment member 3. The axial direction of the opening 112 is the extension and contraction direction of the strain gauge 4, that is, the central axis direction of the adjustment member 3, that is, the adjustment member 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, and then the position of the adsorbent 22 and the lens 200 adsorbed by the adsorbent 22 can be adjusted. During the curing and shrinking process of the glue, a contraction force is generated on the connecting rod 23, causing the connecting rod 23 to deform. The strain gauge 4, attached to the connecting rod 23, deforms along with the connecting rod 23. The relative deformation of the connecting rod 23 can then be measured by reading the relative deformation of the strain gauge. Alternatively, the glue can be UV-curing glue, thermal-curing glue, or dual-curing light-and-heat glue. The frame 21, adsorbent 22, and connecting rod 23 can be manufactured as a single unit and integrated into a single bracket to minimize mechanical error transmission.

[0060] The applicant also wishes to clarify that similar structures and testing methods for measuring lens 200 offset do not exist in the relevant art. Technicians typically estimate glue shrinkage based on manual experience and make repeated adjustments, which is inefficient and difficult to ensure accuracy. Passive fixation methods also exist, relying on high-precision molds to secure components, but these methods 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 has also been adopted. However, this method uses simulation to predict shrinkage deformation, which 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. Glue, which can be UV-curable glue, is then injected into the glue groove 122. The glue is left to stand for 5 seconds to allow the glue to initially spread. The second step is to drive the adjustment member 3 to rotate, causing the lens 200 to move downward to a certain height. At this point, the strain gauge 4 is reset to zero or to a preset reading. Zeroing facilitates subsequent calculations. The third step is to irradiate the UV-curable glue with ultraviolet light, continuously monitoring the strain gauge 4 reading until it reaches a stable value, and recording the strain gauge 4 reading at this time.

[0062] The calculation process of obtaining the displacement of the lens 200 is described below using the first method and the second method respectively, and will be described in detail in the subsequent method steps.

[0063] The first method is known. The calculation of glue shrinkage force is: F = EAe, where E is the elastic modulus of the connecting rod 23 material, A is the cross-sectional area of the strain gauge 4's sensitive area, which corresponds to the cross-sectional area of the connecting rod 23, and e is the change in the strain gauge 4 reading. It should be noted that the glue shrinkage force also acts on the connecting rod 23, causing the connecting rod 23 to deform under the action of force F. The strain gauge 4 reading shows the relative change. The gauge length of the strain gauge 4 is L, and the actual displacement of the 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 that the strain gauge 4 is initially zeroed. Then, e is the reading of the strain gauge 4 after ultraviolet irradiation. This can be used to determine the displacement of the lens 200. In a specific embodiment, the connecting rod 23 can be made of aluminum alloy, E = 70 GPa, and the cross-sectional area of the strain gauge's sensitive area is calibrated to A = 2 mm. 2 , the strain gauge gauge length L = 10 mm, and the strain gauge reading change e is dimensionless. The applicant would like to clarify that this embodiment measures the change in strain gauge 4 along the axial direction, thereby obtaining the axial displacement of the lens 200. If horizontal displacement is desired, horizontal strain gauges 4 can also be installed. This means that by increasing the strain gauge array layout, simultaneous measurement of displacement in the X, Y, and Z axes is possible, using a similar calculation method as described above.

[0064] The second method uses the known glue shrinkage force calculation: 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, which corresponds to the cross-sectional area of connecting rod 23, and e is the change in the strain gauge 4 reading. It should be noted that the glue shrinkage force also acts on connecting rod 23, and 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 that strain gauge 4 is initially reset to zero. In this case, e is the reading e2 of strain gauge 4 after ultraviolet irradiation. The actual displacement of the lens 200 is defined 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 directly obtained. F1 can be calculated based on the third and fourth readings of the strain gauge, thereby obtaining the actual displacement of the lens 200.

[0065] By providing an adsorption member 22 to adsorb the lens 200 and recording the strain of the strain gauge 4 after the glue is 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 changes 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 provided in the receiving cavity 111 . The contoured lens barrel 12 is provided with a receiving groove 121 .

[0067] During actual measurement, a receiving groove 121 and a glue groove 122 can be provided in the base 1, and during testing, only the lens 200 needs to be taken for testing. Of course, the base 1 can also be provided with a fixed sub-base 11 and a contoured lens barrel 12, and the contoured lens barrel 12 can be detachably connected to the fixed sub-base 11. During testing, the lens barrel of the virtual reality device and the lens 200 can be placed together for testing, and different types of contoured lens barrels 12 can also be replaced according to the type of lens 200, so that it can be suitable for testing various types of lenses 200.

[0068] Reference Figure 1 In some embodiments, a positioning groove 114 is provided at the edge of the opening 112 , 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 the outer edge of the opening 112. The positioning groove 114 is used to facilitate 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. When the frame 21 is positioned and installed in the positioning groove 114, the adjusting member 3 can be threadedly connected through the second mounting hole 2221 to be installed in the first mounting hole 113, thereby enabling the position of the lens 200 to 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 along the periphery of the center plate 211. The support legs 212 include arc segments 2121 and connecting segments 2122 connected to each other. The end of the arc segment 2121 away from the connecting segment 2122 is connected to the center plate 211. The connecting segment 2122 is arranged in the positioning groove 114. A second mounting hole 2221 is provided on the connecting segment 2122. 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 central plate 211 and legs 212. The central plate 211 is a circular plate, and the legs 212 are evenly distributed around the periphery of the central plate 211. Specifically, the legs 212 include arcuate segments 2121 and connecting segments 2122. The arcuate segments 2121 may be arched, and the connecting plates may be plate-shaped, matching the shape of the positioning groove 114. The connecting plates may be precisely positioned within the positioning groove 114, and the first mounting hole 113 is disposed within the positioning groove 114. The connecting rod 23 is disposed 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, and the multiple first mounting holes 113 are evenly distributed along the edge of the opening 112. The number of second mounting holes 2221 and adjusting members 3 is the same as the number of first mounting holes 113, and they are connected one-to-one.

[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 rotates within the first mounting hole 113, causing the adjusting member 3 to move along its own central axis. This movement of the adjusting member 3 drives the frame 21 to move, thereby moving the lens 200 mounted on the adsorption member 22, achieving zero adjustment of the strain gauge 4 during the measurement step. It should be noted that during the adjustment process, the adjustments of the multiple adjusting members 3 are independent of each other.

[0074] In some embodiments, the displacement testing device 100 further includes a displacer, which is signal-connected to the adjusting member 3 so as to control the adjustment distance of the adjusting member 3 through the displacer.

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

[0076] According to some embodiments of the present application, the present application provides a displacement testing device 100, including a base 1, an adjustment bracket 2, an adjustment member 3 and a displacer, the base 1 is formed with an opening 112, a first mounting hole 113 is provided on the edge of the opening 112, a receiving groove 121 for accommodating the lens 200 is provided in the base 1, and a glue groove 122 is provided at the bottom of the receiving groove 121; the adjustment bracket 2 includes a frame body 21, an adsorption member 22 and a connecting rod 23 connecting the frame body 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, and the frame body 21 is provided with a second mounting hole 2221 corresponding to the first mounting hole 113; the adjustment member 3 passes through the second mounting hole 2221 and is threadedly connected to the first mounting hole 113, and the adjustment member 3 can be rotated 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 central plate 211 and legs 212 distributed along the periphery of the central plate 211. The legs 212 include interconnected arcuate segments 2121 and connecting segments 2122. The arcuate segments 2121 are connected to the central plate 211 at their ends distal from the connecting segments 2122. The connecting segments 2122 are disposed within the positioning groove 114 and are provided with a second mounting hole 2221. A connecting rod 23 connects the central plate 211 and the adsorbent 22. The extension and retraction direction of the strain gauge 4 is aligned with the axial direction of the opening 112. The displacer is signal-connected to the adjusting member 3, thereby controlling the adjustment distance of the adjusting member 3 via the displacer. This embodiment can detect the displacement of the lens 200 using the strain measured by the strain gauge 4 and can also monitor the displacement changes of the lens 200 in real time, offering the advantage of high detection accuracy.

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

[0078] First, the first test method is described in detail. Figure 6 , Figure 6This is a flow chart of a displacement testing method according to a first embodiment of the present application. The present application provides a displacement testing method, which is applied to the above-mentioned displacement testing device 100. The displacement testing method includes:

[0079] S100 , installing the lens 200 in the receiving groove 121 of the base 1 , and injecting a preset amount of light-curing glue into the glue groove 122 .

[0080] The displacement testing device 100 includes a base 1, an adjustment bracket 2 and an adjustment member 3. The base 1 is formed with an opening 112, and a first mounting hole 113 is provided on the edge of the opening 112. A receiving groove 121 for accommodating the lens 200 is provided in the base 1, and a glue groove 122 is provided at the bottom of the receiving groove 121; the adjustment bracket 2 includes a frame 21, an adsorption member 22 and a connecting rod 23 connecting the frame 21 and the adsorption member 22, and a strain gauge 4 is attached to the connecting rod 23. The adsorption member 22 is used to adsorb the lens 200, and the frame 21 is provided with a second mounting hole 2221 corresponding to the first mounting hole 113; the adjustment member 3 passes through the second mounting hole 2221 and is threadedly connected to the first mounting hole 113. The adjustment member 3 can be rotated 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 a glue groove 122 is provided within the receiving groove 121. The amount of glue injected can be precisely controlled by a glue injection machine, and the glue groove 122 is used to control the flow path of the glue. It should be noted that the glue used here is a light-curing glue, which can be cured and set under the irradiation of ultraviolet light to adhere the lens 200 to the receiving groove 121.

[0081] S200 , controlling the adsorption member 22 to adsorb the lens 200 , driving the adjustment member 3 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 , and obtaining a first reading of the strain gauge 4 .

[0082] The suction member 22 can vacuum-suction the lens 200. This suction holds the lens 200 in place so that the adjustment member 3 can subsequently control the movement of the suction member 22, thereby causing the lens 200 to move with the suction member 22. Because the adjustment 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 the receiving groove 121, a certain force will be applied, causing the strain gauge 4 to deform and display a reading. Therefore, adjusting the height of the lens 200 can adjust the first reading of the strain gauge 4.

[0083] S300: Curing the light-curing adhesive using an ultraviolet light source to obtain a second reading of the strain gauge 4 after stabilization.

[0084] The photocurable adhesive is irradiated with an ultraviolet light source. The adhesive shrinks during the curing process, which drives the lens 200 to move, thereby causing the reading of the strain gauge 4 to change. After the reading of the strain gauge 4 stabilizes, the second reading of the strain gauge 4 can be recorded.

[0085] S400 , obtaining the displacement of the lens 200 according to the first reading and the second reading.

[0086] The change in the strain gauge 4 reading is caused by the expansion and contraction deformation 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 quantifying the displacement of the lens 200.

[0087] In the above embodiment of the present invention, the lens 200 is installed in the receiving groove 121 of the base 1, a preset amount of photocuring glue is injected into the glue groove 122, the adsorption component 22 is controlled to adsorb the lens 200, the adjustment component 3 is driven to rotate to adjust the position of the adsorption component 22 along the axial direction of the opening 112, and then the height of the lens 200 is adjusted, the first reading of the strain gauge 4 is obtained, the photocuring glue is cured using an ultraviolet light source, and the second reading of the strain gauge 4 after stabilization is obtained. The displacement of the lens 200 is obtained based on the first reading and the second reading. Not only can the displacement of the lens 200 be quantified, but the offset process of the lens 200 can also be detected through the change in the reading of the strain gauge 4, which has the advantage of high detection accuracy.

[0088] Reference Figure 7 , Figure 7 This is a flow chart of the displacement testing method according to the second embodiment of the present application. Step S200 includes:

[0089] S201 , controlling the adsorption member 22 to adsorb the lens 200 , driving the adjustment member 3 to rotate to adjust the position of the adsorption member 22 along the axial direction of the opening 112 , and further adjusting the height of the lens 200 until the first reading of the strain gauge 4 is zero.

[0090] This embodiment sets the first reading to 0 primarily to simplify calculations. Specifically, the calculation process for lens 200 displacement is described below. 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 area of the 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 relative change. The gauge length of the strain gauge 4 is L, and the actual displacement of the lens 200 is Z. Thus, Z = F * L / E / A = L * e. In this formula, L can be pre-determined. In the second step, the preset reading can be set to 0, meaning that the strain gauge 4 is initially zeroed. Then, e is the reading of the strain gauge 4 after ultraviolet irradiation, thus obtaining the displacement of the lens 200. The applicant would also like to clarify that this embodiment measures the change in the strain gauge 4 along the axial direction, thereby obtaining the axial displacement of the lens 200. To obtain horizontal displacement, a horizontal strain gauge 4 can also be provided, using a similar calculation method.

[0091] Reference Figure 8 , Figure 8 This is a flow chart of the displacement testing method according to the third embodiment of the present application. After step S100, the following steps are further included:

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

[0093] Temperature fluctuations can affect the curing of glue, which can directly affect the offset of the lens 200 and cause deviations in the final test results. Therefore, the lens 200 and base 1 can be preheated to their normal operating temperature before glue injection and curing. Alternatively, the lens 200 and base 1 can be placed directly in a constant temperature device, where subsequent glue dispensing and curing can be completed. This can minimize the impact of temperature fluctuations, thereby reducing lens 200 offset caused by temperature fluctuations and improving test accuracy.

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

[0095] S301, using a first sub-light source to perform a first curing of the light-curing adhesive at a first preset time and a first preset temperature;

[0096] S302 , using a second sub-light source to perform a second curing of the light-curing adhesive 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 uses a step-by-step curing process to avoid the large volume changes caused by a single curing step, which could result in excessive deviations in the test results due to instantaneous movement of the lens 200. Specifically, by properly controlling the light source intensity, time, and curing temperature, inaccurate results caused by instantaneous movement of the lens 200 can be reduced. During the first curing step, the first preset time can be set longer and the first preset temperature can be set lower, allowing the glue to slowly reach the first preset temperature and slowly cure. During the second curing step, since the glue has already reached a certain temperature, the second preset time can be set shorter and the second preset temperature can be set higher for efficiency considerations.

[0098] Next, the second test method is described in detail. Figure 10 , Figure 10 FIG. 5 is a flow chart of a displacement testing method according to a fifth embodiment of the present application. The present application provides a displacement testing method applied to the above-mentioned displacement testing device 100. The displacement testing method includes:

[0099] S001 , installing the lens 200 in the receiving groove 121 of the base 1 , and injecting a preset amount of light-curing glue into the glue groove 122 .

[0100] The displacement testing device 100 includes a base 1, an adjustment bracket 2 and an adjustment member 3. The base 1 is formed with an opening 112, and a first mounting hole 113 is provided on the edge of the opening 112. A receiving groove 121 for accommodating the lens 200 is provided in the base 1, and a glue groove 122 is provided at the bottom of the receiving groove 121; the adjustment bracket 2 includes a frame 21, an adsorption member 22 and a connecting rod 23 connecting the frame 21 and the adsorption member 22, and a strain gauge 4 is attached to the connecting rod 23. The adsorption member 22 is used to adsorb the lens 200, and the frame 21 is provided with a second mounting hole 2221 corresponding to the first mounting hole 113; the adjustment member 3 passes through the second mounting hole 2221 and is threadedly connected to the first mounting hole 113. The adjustment member 3 can be rotated 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 a glue groove 122 is provided within the receiving groove 121. The amount of glue injected can be precisely controlled by a glue injection machine, and the glue groove 122 is used to control the flow path of the glue. It should be noted that the glue used here is a light-curing glue, which can be cured and set under the irradiation of ultraviolet light to adhere the lens 200 to the receiving groove 121.

[0101] S002, controlling the adsorption member 22 to move and adsorb the lens 200 to obtain a third reading of the strain gauge;

[0102] The external driver can control the suction member 22 to move to adhere to the lens 200, obtaining a third reading of the strain gauge 4. At this point, pressure may be applied between the suction member 22 and the lens 200, causing the strain gauge 4 to deform slightly. In one specific embodiment, the external driver can be controlled to precisely adhere the suction member 22 to the lens 200, eliminating strain on the strain gauge 4 and resulting in a third reading of 0. This reduces subsequent computational complexity and improves detection accuracy.

[0103] S003, curing the light-curing adhesive using an ultraviolet light source, and obtaining a fourth reading of the strain gauge 4 after the curing is completed.

[0104] Unlike the first method, this embodiment maintains the adsorbent 22 attached to the lens 200 during curing. During the curing process, the shrinkage of the glue exerts a contracting force on the lens 200, pulling on the adsorbent 22 and connecting rod 23. The connecting rod 23 deforms under the force, causing the reading of the strain gauge 4 attached to the connecting rod 23 to change. The term "stabilized" here refers to the fourth reading of the strain gauge 4 after the curing is complete, or after a period of time after the curing is complete, when the reading of the strain gauge 4 no longer changes.

[0105] S004 , obtaining the displacement of the lens 200 according to the third reading and the fourth reading.

[0106] The following describes the calculation process for obtaining the displacement of lens 200. It is known that the glue shrinkage force is calculated as: F1 = EAe, where E is the elastic modulus of the material of connecting rod 23, A is the cross-sectional area of the sensitive region of strain gauge 4, which corresponds to the cross-sectional area of connecting rod 23, and e is the change in the strain gauge 4 reading. It should be noted that the glue shrinkage force also acts on connecting rod 23, and connecting rod 23 may deform under the action of force F1. The strain gauge 4 reading indicates 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 strain gauge 4 is initially reset to zero. In this case, e is the reading e2 of strain gauge 4 after ultraviolet irradiation. The actual displacement of the lens 200 is defined 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 directly obtained. F1 can be calculated based on the third and fourth readings of the strain gauge, thereby obtaining the actual displacement of the lens 200.

[0107] In the above embodiment of the present invention, the lens 200 is installed in the receiving groove 121 of the base 1, a preset amount of photocuring glue is injected into the glue groove 122, the adsorption part 22 is controlled to adsorb the lens 200, the third reading of the strain gauge 4 is obtained, the photocuring glue is cured by an ultraviolet light source, and the fourth reading of the strain gauge 4 after stabilization is obtained. The displacement of the lens 200 is obtained based on the third reading and the fourth reading. Not only can the displacement of the lens 200 be quantified, but the offset process of the lens 200 can also be detected through the change in the reading of the strain gauge 4, 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 steps of curing the light-curing adhesive using the ultraviolet light source include:

[0109] Using a first sub-light source to perform a first curing of the light-curing adhesive at a first preset time and a first preset temperature;

[0110] Using a second sub-light source to perform a second curing of the light-curing adhesive at a second preset time and a second preset temperature;

[0111] The first preset time is greater than the second preset time, and the first preset temperature is less than the second preset temperature.

[0112] This embodiment uses a step-by-step curing process to avoid the large volume changes caused by a single curing step, which could result in excessive deviations in the test results due to instantaneous movement of the lens 200. Specifically, by properly controlling the light source intensity, time, and curing temperature, inaccurate results caused by instantaneous movement of the lens 200 can be reduced. During the first curing step, the first preset time can be set longer and the first preset temperature can be set lower, allowing the glue to slowly reach the first preset temperature and slowly cure. During the second curing step, since the glue has already reached a certain temperature, the second preset time can be set shorter and the second preset temperature can be set higher for efficiency considerations.

[0113] In addition, the lens 200 and base 1 can be placed in a constant temperature device for preheating. Since temperature changes may affect the curing of the glue, the curing of the glue will directly affect the offset of the lens 200, causing deviations in the final detection results. Therefore, before injecting glue and curing, the lens 200 and base 1 can be preheated to the normal operating temperature, or the lens 200 and base 1 can be directly placed in a constant temperature device, and subsequent glue dispensing and curing are completed in the constant temperature device. This can reduce the impact of temperature changes, thereby reducing the offset of the lens 200 caused by temperature changes and improving the accuracy of detection.

[0114] The above description is merely an optional embodiment of the present application and does not limit the scope of protection of the present application. All equivalent structural transformations made using the contents of the present application specification and drawings under the application concept of the present application, or direct / indirect application in other related technical fields are included in the scope of patent protection of the present application.

Claims

1. A displacement testing device, characterized in that: include: A base, wherein the base is formed with an opening, a first mounting hole is provided on an edge of the opening, a receiving groove for receiving the lens is provided in the base, and a glue groove is provided at the bottom of the receiving groove; An adjustment bracket, the adjustment bracket comprising a frame, an adsorption member, and a connecting rod connecting the frame and the adsorption member, the connecting rod being attached with a strain gauge, the adsorption member being used to adsorb the lens, and the frame being provided with a second mounting hole corresponding to the first mounting hole; An adjusting member passes through the second mounting hole and is threadedly connected to the first mounting hole, and the adjusting member can be rotated to adjust the position of the adsorption member along the axial direction of the opening.

2. The displacement testing device according to claim 1, characterized in that: The base comprises 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 arranged in the receiving cavity, and the contoured lens barrel is provided with the receiving groove.

3. The displacement testing device according to claim 1, characterized in that: A positioning groove is provided at the edge of the opening, the first mounting hole is provided at the bottom of the positioning groove, and the frame is mounted in the positioning groove.

4. The displacement testing device according to claim 3, characterized in that: The frame includes a center plate and supporting legs distributed along the periphery of the center plate, the supporting legs include arc segments and connecting segments connected to each other, the end of the arc segment away from the connecting segment is connected to the center plate, the connecting segment is arranged in the positioning groove, the connecting segment is provided with the second mounting hole, the connecting rod connects the center plate and the adsorption part, and the deformation direction of the connecting rod is consistent with the axial direction of the opening.

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

6. The displacement testing device according to claim 1, characterized in that: The displacement testing device further includes a displacer, which is connected to the adjusting member via a signal so as to control the adjustment distance of the adjusting member through the displacer.

7. A displacement testing method, applied to the displacement testing device according to any one of claims 1 to 6, characterized in that: The displacement testing method comprises: Install the lens into the receiving groove of the base and inject a preset amount of light-curing glue into the glue groove; Controlling the adsorption member to adsorb the lens, driving the adjustment member to rotate to adjust the position of the adsorption member along the axial direction of the opening, thereby adjusting the height of the lens, and obtaining a first reading of the strain gauge; The photocurable adhesive is cured using an ultraviolet light source, a second reading of the strain gauge is obtained after stabilization, and the displacement of the lens is obtained according to the first reading and the second reading.

8. The displacement testing method according to claim 7, characterized in that: The steps of controlling the adsorption member to adsorb the lens, driving the adjustment member to rotate to adjust the position of the adsorption member along the axial direction of the opening, and thus adjusting the height of the lens, and obtaining the first reading of the strain gauge include: The adsorption member is controlled to adsorb the lens, and the adjustment member is driven to rotate to adjust the position of the adsorption member along the axial direction of the opening, thereby adjusting the height of the lens until the first reading of the strain gauge is zero.

9. The displacement testing method according to claim 7, characterized in that: After the steps of installing the lens in the receiving groove of the base and injecting light-curing glue into the glue groove, the method further includes the following steps: Place the lens and base in a constant temperature device to preheat.

10. The displacement testing method according to any one of claims 7 to 9, characterized in that: The ultraviolet light source includes a first sub-light source and a second sub-light source, and the step of curing the light-curing adhesive using the ultraviolet light source includes: Using the first sub-light source to perform a first curing of the light-curing adhesive at a first preset time and a first preset temperature; curing the light-curing adhesive for a second time at a second preset time and a second preset temperature using the second sub-light source; Wherein, the first preset time is greater than the second preset time, and the first preset temperature is less than the second preset temperature.

11. A displacement testing method, applied to the displacement testing device according to any one of claims 1 to 6, characterized in that: The displacement testing method comprises: Install the lens into the receiving groove of the base and inject a preset amount of light-curing glue into the glue groove; controlling the adsorption member to move and adsorb the lens to obtain a third reading of the strain gauge; Curing the light-curing adhesive using an ultraviolet light source, and after the curing is completed, obtaining a fourth reading of the strain gauge after stabilization; The displacement of the lens is obtained according to the third reading and the fourth reading.

12. The displacement testing method according to claim 11, characterized in that: The ultraviolet light source includes a first sub-light source and a second sub-light source, and the step of curing the light-curing adhesive using the ultraviolet light source includes: Using the first sub-light source to perform a first curing of the light-curing adhesive at a first preset time and a first preset temperature; curing the light-curing adhesive for a second time at a second preset time and a second preset temperature using the second sub-light source; Wherein, the first preset time is greater than the second preset time, and the first preset temperature is less than the second preset temperature.

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