Method and device for measuring surface removal amount of glass workpiece

Abstract

The present application discloses a method for measuring the amount of material removed from a glass workpiece surface, specifically comprising: providing a glass workpiece, forming a mark inside the glass workpiece; measuring a first distance between the mark and a first surface, and a second distance between the mark and a second surface, respectively; after polishing the glass workpiece from the first surface side to obtain a first polished surface, measuring a third distance between the first polished surface and the mark; after polishing the glass workpiece from the second surface side to obtain a second polished surface, measuring a fourth distance between the second polished surface and the mark; obtaining a first thickness removed from the first surface based on the first distance and the third distance; and obtaining a second thickness removed from the second surface based on the second distance and the fourth distance. The present application's method for measuring the amount of material removed from a glass workpiece surface can measure the amount of material removed from both sides of the glass workpiece. The present application also discloses a measuring device using the method for measuring the amount of material removed from a glass workpiece surface.

Description

Technical Field

[0001] The present application relates to the technical field of removal amount measurement, and in particular to a method for measuring the removal amount on the surface of a glass workpiece and a measuring device using the method. Background Art

[0002] Currently, after polishing both sides of a glass workpiece, the amount of material removed from both sides needs to be measured. However, due to the transparency of glass, it is difficult to distinguish the boundary between the glass workpiece before and after polishing, making it difficult to measure the amount of material removed from both sides. This is a technical problem that currently plagues R&D personnel. Summary of the Invention

[0003] In view of the above, it is necessary to provide a method for measuring the amount of removal from the surface of a glass workpiece and a measuring device using the method, so as to measure the amount of removal from both sides of the glass workpiece.

[0004] An embodiment of the present application provides a method for measuring the amount of surface removal of a glass workpiece, comprising: providing a glass workpiece, the glass workpiece having a first surface and a second surface opposite to each other, and forming a mark inside the glass workpiece; measuring a first distance between the mark and the first surface and a second distance between the mark and the second surface respectively; after polishing the glass workpiece from the first surface side to obtain a first polished surface, measuring a third distance between the first polished surface and the mark; after polishing the glass workpiece from the second surface side to obtain a second polished surface, measuring a fourth distance between the second polished surface and the mark; obtaining a first thickness removed from the first surface based on the first distance and the third distance, and obtaining a second thickness removed from the second surface based on the second distance and the fourth distance.

[0005] When the method for measuring the amount of surface removal of a glass workpiece according to an embodiment of the present application is used to measure the amount of removal on both sides of the glass workpiece, a mark is formed inside the glass workpiece, and the first and second distances between the first and second surfaces and the mark before polishing are measured, as well as the third and fourth distances between the first polished surface and the second polished surface and the mark after polishing are measured. The first thickness of the first surface removed is obtained by the first distance and the third distance, and the second thickness of the second surface removed is obtained by the second distance and the fourth distance, thereby accurately obtaining the amount of removal on both sides of the glass workpiece. The method for measuring the amount of surface removal of a glass workpiece according to an embodiment of the present application is simple to operate and increases the convenience of measurement. In addition, because the mark is set inside the glass workpiece and is small in size and invisible to the naked eye, damage to the surface of the glass workpiece is avoided, ensuring that the glass workpiece can be used normally in the future.

[0006] In some embodiments, the method for measuring the amount of surface removal of a glass workpiece further includes: determining whether the remaining total thickness of the glass workpiece after polishing meets requirements based on the third distance and the fourth distance.

[0007] In some embodiments, the glass workpiece includes a first edge and a second edge that are adjacent to each other, and the mark is a point proximate to a junction of the first edge and the second edge.

[0008] In some embodiments, the distances between the mark and the first edge and the second edge are the same, and the distances between the mark and the first edge and the second edge are in the range of 3 mm to 10 mm.

[0009] In some embodiments, the mark has a diameter ranging from 0.001 mm to 0.006 mm.

[0010] In some embodiments, the mark includes a plurality of marking points arranged at intervals, the first distance and the third distance are respectively the average values ​​of the distances between the first surface and the first polishing surface and the plurality of marking points, and the second distance and the fourth distance are respectively the average values ​​of the distances between the second surface and the second polishing surface and the plurality of marking points.

[0011] In some embodiments, the mark includes a plurality of marking points arranged at intervals, the removal thickness of the first surface corresponding to at least one of the marking points is different from the removal thickness of the first surface corresponding to other marking points, and the third distance is a set of distances between the first polishing surface with different removal thicknesses and the corresponding plurality of marking points.

[0012] In some embodiments, the method for measuring the amount of surface removal of a glass workpiece further includes: forming the mark inside the glass workpiece by laser.

[0013] In some embodiments, before the steps of respectively measuring the first distance between the mark and the first surface and the second distance between the mark and the second surface, the method for measuring the amount of surface removal of a glass workpiece further includes: demarcating an area where the mark may be located based on a preset position of the mark within the glass workpiece; performing image recognition of the area where the mark may be located using a main camera, and identifying the mark in the acquired image.

[0014] In some embodiments, the step of respectively measuring the first distance between the mark and the first surface and the second distance between the mark and the second surface includes: causing a main camera to gradually move from above the front surface of the glass workpiece toward the mark according to a first step distance along a first direction and perform image recognition on the front surface of the glass workpiece, and when the main camera recognizes the front surface of the glass workpiece, stop moving, and record the position of the main camera at this time as the movement starting position Z0, wherein the front surface is one of the first surface and the second surface; causing the main camera to gradually move from the movement starting position Z0 toward the mark according to the first step distance along the first direction and perform image recognition on the mark until it moves to a maximum movement distance, and stop when the movement reaches the maximum movement distance, and stop when the movement reaches the maximum movement distance. The method comprises the steps of: recording a position reached each time the mark is image-recognized each time during the movement, wherein the maximum movement distance is greater than the distance between a preset position of the mark set in the glass workpiece and the front surface, and the first direction is perpendicular to the front surface; obtaining the clarity of each image by an energy gradient algorithm based on images of the mark at different depths obtained during the movement process, obtaining the arrival position corresponding to the image with the highest clarity based on the clarity value, and recording the arrival position as the true depth position Z1; obtaining the depth H of the mark based on the movement starting position Z0, the true depth position Z1, and the refractive index K of the glass workpiece, where H=(Z1-Z0)×K; and using the depth H of the mark as the value of one of the corresponding first distance and the second distance.

[0015] In some embodiments, the maximum moving distance is less than or equal to the maximum thickness of the glass workpiece.

[0016] In some embodiments, the main camera stops moving when it recognizes the front surface of the glass workpiece, and records the position of the main camera at this time as the starting position Z0 of movement, which includes: demarcating an abnormal area in the image of the front surface of the glass workpiece recognized by the main camera, and taking the position where the main camera stops moving as the starting point, causing the correction camera to gradually move along the first direction toward the mark according to a second step distance, and performing image recognition on the correction area of ​​the front surface of the glass workpiece corresponding to the abnormal area, the main camera moves synchronously with the movement of the correction camera, and when the correction camera recognizes the front surface of the glass workpiece within the correction area, causing the correction camera and the main camera to stop moving, and taking the position of the correction camera at this time as the starting position Z0 of movement of the corrected main camera, wherein the second step distance is smaller than the first step distance.

[0017] The present application also provides a measuring device for measuring the amount of surface removal of a glass workpiece, wherein a mark is formed in the glass workpiece, and the measuring device includes a carrying assembly, a driving assembly, a camera assembly, a displacement sensor, and a controller; the carrying assembly is used to carry the glass workpiece and position the glass workpiece; the driving assembly is arranged adjacent to the carrying assembly; the camera assembly is connected to the driving assembly, and the driving assembly is used to drive the camera assembly to move, and the camera assembly is used to acquire an image of the mark and the surface of the glass workpiece; the displacement sensor is arranged on the driving assembly, and is used to sense the movement position of the driving assembly; the controller is coupled to the driving assembly, the camera assembly, and the displacement sensor, and receives the image acquired by the camera assembly and the position information sensed by the displacement sensor, so as to obtain the distance between the mark and the initial surface of the glass workpiece and the distance between the mark and the polished surface obtained after the glass workpiece is processed based on the position information sensed by the displacement sensor when the camera assembly acquires the image of the mark and the surface of the glass workpiece, thereby obtaining the amount of removal of the glass workpiece.

[0018] The above-mentioned measuring device drives the camera assembly to move through the driving assembly, obtains images of the mark and the surface of the glass workpiece through the camera assembly, and senses the moving position of the driving assembly through the displacement sensor. Then, the controller obtains the distance between the mark and the initial surface of the glass workpiece and the distance between the mark and the polished surface obtained after the glass workpiece is processed based on the position information sensed by the displacement sensor when the camera assembly obtains the image of the mark and the surface of the glass workpiece. This realizes the function of measuring the removal amount of both sides of the glass workpiece without damaging the surface of the glass workpiece, ensuring that the glass workpiece can be used normally later. In addition, the measuring device of the embodiment of the present application is simple to operate and increases the convenience of measurement.

[0019] In some embodiments, the camera assembly includes a main camera and a correction camera, both of which are coupled to the controller. The main camera and the correction camera are respectively used to move stepwise along the first direction toward the glass workpiece according to the first step distance and the second step distance under the drive of the driving assembly, and perform image recognition on the surface of the glass workpiece and the mark during the movement, and then transmit the recognized images of the glass workpiece surface and the mark to the controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 4 is a flow chart of a method for measuring the amount of surface removal of a glass workpiece according to an embodiment of the present invention.

[0021] Figure 2 yes Figure 1 Specific flow chart of step S4 in FIG.

[0022] Figure 3 It is a structural schematic diagram of a glass workpiece before polishing in an embodiment of the present application.

[0023] Figure 4 yes Figure 3 The glass workpiece shown is a cross-sectional view along III-III.

[0024] Figure 5 It is a schematic diagram of the structure of the glass workpiece after polishing in the embodiment of the present application.

[0025] Figure 6 yes Figure 5 The glass workpiece is shown in a cross-sectional view along line VI-VI.

[0026] Figure 7 This is the image when the main camera recognizes that there are no protrusions or impurities on the front surface of the glass workpiece in the embodiment of the present application.

[0027] Figure 8 This is the image when the main camera in the embodiment of the present application recognizes that there are protrusions or impurities on the front surface of the glass workpiece.

[0028] Figure 9 This is the image when the calibration camera in the embodiment of the present application recognizes the front surface of the glass workpiece.

[0029] Figure 10 It is a schematic diagram of the three-dimensional structure of the measuring device and the glass workpiece in the embodiment of the present invention.

[0030] Figure 11 Schematic diagram of the hardware architecture of the measuring device in an embodiment of the present invention.

[0031] Description of main component symbols

[0032] Glass workpiece 100

[0033] First surface 10

[0034] First polishing surface 11

[0035] Second surface 20

[0036] Second polishing surface 21

[0037] Mark 30

[0038] First edge 40

[0039] Second edge 50

[0040] Measuring device 200

[0041] Machine 210

[0042] Base 211

[0043] Mounting frame 212

[0044] Carrying assembly 220

[0045] Support seat 221

[0046] Carrying plate 222

[0047] Positioning pin 223

[0048] First adjustment lever 224

[0049] Second adjustment lever 225

[0050] Drive assembly 230

[0051] Drive motor 231

[0052] Slider 232

[0053] Slide 233

[0054] Drive screw 234

[0055] Camera assembly 240

[0056] Main camera 241

[0057] Calibration Camera 242

[0058] Displacement sensor 250

[0059] Controller 260 DETAILED DESCRIPTION

[0060] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application.

[0061] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, it should be noted that the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0062] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0063] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0064] See also Figure 1 The embodiment of the present application provides a method for measuring the amount of removal from the surface of a glass workpiece. The measuring method is used to measure the amount of removal from the surface of a glass workpiece 100 (e.g. Figure 3 The amount of removal on both sides (for example, the front and back) of the glass workpiece 100 to be measured can be a cover glass of an electronic device, a car windshield, a decorative curtain wall glass, etc. For the sake of ease of description and understanding, the present embodiment of the application takes the glass workpiece 100 as a mobile phone cover glass as an example, and defines the first direction as follows: Figure 10 The negative direction of the Z axis is shown, and the second direction is as shown Figure 10 The X-axis direction is shown, and the third direction is Figure 10 The Y-axis direction shown, wherein the X-axis direction, the Y-axis direction and the Z-axis direction are perpendicular to each other, obviously, this is not a limitation of the embodiments of the present application.

[0065] Please also refer to Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 The method for measuring the amount of glass workpiece surface removal in the embodiment of the present application includes the following steps:

[0066] In step S2 , a glass workpiece 100 is provided. The glass workpiece 100 has a first surface 10 and a second surface 20 opposite to each other. A mark 30 is formed inside the glass workpiece 100 .

[0067] Specifically, the first surface 10 and the second surface 20 are two opposite surfaces of the glass workpiece 100 in the thickness direction, and the mark 30 is disposed inside the workpiece and between the first surface 10 and the second surface 20 .

[0068] In one embodiment, the mark 30 is formed inside the glass workpiece 100 by laser lithography. Laser lithography avoids damaging the surface of the glass workpiece 100. Furthermore, due to the very small size of the mark 30, its impact on the function and appearance of the glass workpiece 100 is negligible, thus not affecting the subsequent normal use of the glass workpiece 100. Furthermore, laser lithography renders the mark 30 substantially black, thereby distinguishing it from the color of the glass workpiece 100 and facilitating identification using tools such as cameras and microscopes.

[0069] In one embodiment, see Figure 3 The glass workpiece 100 includes a first edge 40 and a second edge 50 adjacent to each other. The mark 30 is a point located near the intersection of the first edge 40 and the second edge 50. Specifically, the first edge 40 and the second edge 50 are two adjacent side walls of the glass workpiece 100. The first edge 40 and the second edge 50 can form a straight angle between them, or they can be connected by a curved transition. Because the intersection of the first edge 40 and the second edge 50 is located at a corner of the glass workpiece 100, it is not easily noticed when the glass workpiece 100 is in use. Therefore, by placing the mark 30 near the intersection of the first edge 40 and the second edge 50, the impact of the mark 30 on the use of the glass workpiece 100 can be further reduced.

[0070] In one embodiment, the distances between the mark 30 and the first edge 40 and the second edge 50 are the same, and both are in the range of 3 mm to 10 mm. By limiting the distances between the mark 30 and the first edge 40 and the second edge 50, the mark 30 is brought closer to the intersection of the first edge 40 and the second edge 50, thereby further reducing the impact of the mark 30 on the use of the glass workpiece 100.

[0071] In one embodiment, the diameter of the mark 30 ranges from 0.001 mm to 0.006 mm. When the diameter of the mark 30 is within this range, the mark 30 is essentially invisible to the naked eye within the glass workpiece 100 and has little impact on the use of the glass workpiece 100. Furthermore, setting the diameter of the mark 30 within this range ensures that the diameter of the mark 30 is not too small, thereby facilitating identification using tools such as cameras and microscopes. Specifically, the diameter of the mark 30 can be set to 0.003 mm, minimizing the diameter of the mark 30 while facilitating identification using tools such as cameras and microscopes.

[0072] In step S4 , a first distance d1 between the mark 30 and the first surface 10 and a second distance d2 between the mark 30 and the second surface 20 are measured respectively.

[0073] Please also refer to Figure 2 and Figure 10 In the embodiment of the present application, in order to measure the first distance d1 and the second distance d2, step S4 may specifically include the following steps:

[0074] Step S41 includes: step S411, causing the main camera 241 to gradually move from above the front surface of the glass workpiece 100 along the first direction toward the mark 30 according to the first step distance and perform image recognition on the front surface of the glass workpiece 100; step S412, when the main camera 241 recognizes the front surface of the glass workpiece 100, it stops moving and records the position of the main camera 241 at this time as the moving starting position Z0.

[0075] Specifically, the front surface is one of the first surface 10 and the second surface 20, the first direction is a direction perpendicular to the front surface, the main camera 241 can be set on a driving component 230, and the driving component 230 is also provided with a displacement sensor 250, which is used to sense the position of the main camera 241 moved by the driving component 230. The main camera 241, the driving component 230 and the displacement sensor 250 are all coupled to a controller 260. The driving component 230 drives the main camera 241 to move gradually from above the front surface of the glass workpiece 100 along the first direction toward the mark 30 according to the first step distance and perform image recognition on the front surface of the glass workpiece 100. When the main camera 241 does not recognize the image of the front surface, the captured image is generally grayish white. When the main camera 241 recognizes the image of the front surface, as shown in FIG. Figure 7 As shown, the image captured by the main camera 241 changes from grayish white to grayish white stripes. At this time, the driving component 230 drives the main camera 241 to stop moving, and the position of the main camera 241 at this time is the moving starting position Z0.

[0076] In step S42, the main camera 241 is caused to gradually move from the moving starting position Z0 toward the mark 30 along the first direction according to the first step distance and perform image recognition on the mark 30 until it stops when it moves to the maximum moving distance, and the position reached each time the mark 30 is image recognized is recorded during the movement process, wherein the maximum moving distance is greater than the distance between the preset position set by the mark 30 in the glass workpiece 100 and the front surface.

[0077] Specifically, after the starting position Z0 of movement is determined, the driving component 230 drives the main camera 241 to move step by step from the starting position Z0 to the mark 30 along the first direction according to the first step distance and perform image recognition on the mark 30. During the movement, the displacement sensor 250 senses the position reached each time the main camera 241 performs image recognition on the mark 30. The main camera 241 transmits the captured image to the controller 260, and the displacement sensor 250 transmits the acquired position information to the controller 260. The controller 260 associates and stores the image captured by the main camera 241 and the position information acquired by the displacement sensor 250. When the driving component 230 drives the main camera 241 to move to the maximum moving distance, the driving of the main camera 241 is stopped. The maximum moving distance here needs to be set accordingly according to the preset position set by the mark 30 in the glass workpiece 100. Since the mark 30 will be specifically set according to the preset position when it is formed in the glass workpiece 100, but there will be a certain deviation between the actual setting position and the preset position, after considering the maximum deviation, the maximum moving distance is set to be greater than the distance between the preset position set by the mark 30 in the glass workpiece 100 and the front surface, so that the main camera 241 can obtain the image of the mark 30 within the maximum moving distance.

[0078] In one embodiment, the maximum movement distance is less than or equal to the maximum thickness of the glass workpiece 100. Since the mark 30 is disposed within the glass workpiece 100, the distance between the mark 30 and the front surface must be less than the maximum thickness of the glass workpiece 100. Setting the maximum movement distance to be less than or equal to the maximum thickness of the glass workpiece 100 can prevent the main camera 241 from increasing the time required to recognize the mark 30 due to excessive movement distance, thereby improving the efficiency of the main camera 241 in recognizing the mark 30.

[0079] In step S43, based on the images of the marker 30 at different depths obtained during the movement, the clarity of each image is obtained by an energy gradient algorithm, and the arrival position corresponding to the image with the highest clarity is obtained according to the clarity value, and the arrival position is recorded as the true depth position Z1.

[0080] Specifically, the controller 260 obtains the clarity of each image based on the images of the marker 30 at different depths obtained by the main camera 241 during the movement, through a software module that implements the energy gradient algorithm, and then obtains an image with the highest clarity. Since the controller 260 stores the correspondence between the images taken by the main camera 241 and the position information obtained by the displacement sensor 250, the controller 260 can obtain the arrival position corresponding to the main camera 241 based on the image with the highest clarity, and then obtain the true depth position Z1.

[0081] In step S44 , the depth H of the mark 30 is obtained according to the movement starting position Z0 , the actual depth position Z1 , and the refractive index K of the glass workpiece 100 , where H=( Z1 − Z0 )×K.

[0082] Specifically, since the lens of the main camera 241 is a photosensitive element, and light will be refracted when propagating inside the glass workpiece 100, the refractive index of the glass workpiece 100 needs to be considered when calculating the depth of the mark 30. The depth H of the mark 30 is obtained by the above formula, and the distance between the mark 30 and the front surface of the glass workpiece 100 can be obtained.

[0083] Step S45 : Using the depth H of the mark 30 as the value of one of the corresponding first distance d1 and second distance d2 .

[0084] Specifically, when the front surface is the first surface 10 , the depth H of the mark 30 is the value of the first distance d1 , and when the front surface is the second surface 20 , the depth H of the mark 30 is the value of the second distance d2 .

[0085] Step S6 : After polishing the glass workpiece 100 from the first surface 10 to obtain the first polished surface 11 , a third distance d3 between the first polished surface 11 and the mark 30 is measured.

[0086] Specifically, after polishing the glass workpiece 100 from one side of the first surface 10 to obtain the first polished surface 11, the first polished surface 11 is used as the front surface, and by executing the above steps S41-S44, the depth H of the mark 30 is used as the value of the third distance d3 to obtain the third distance d3.

[0087] Step S8 : After polishing the glass workpiece 100 from the second surface 20 to obtain the second polished surface 21 , a fourth distance d4 between the second polished surface 21 and the mark 30 is measured.

[0088] Specifically, after polishing the glass workpiece 100 from one side of the second surface 20 to obtain the second polished surface 21, the second polished surface 21 is used as the front surface, and by executing the above steps S41-S44, the depth H of the mark 30 is used as the value of the fourth distance d4 to obtain the fourth distance d4.

[0089] Step S10 , obtaining a first thickness removed from the first surface 10 according to the first distance d1 and the third distance d3 , and obtaining a second thickness removed from the second surface 20 according to the second distance d2 and the fourth distance d4 .

[0090] Specifically, the first thickness removed from the first surface 10 can be obtained by subtracting the first distance d1 from the third distance d3. The second thickness removed from the second surface 20 can be obtained by subtracting the second distance d2 from the fourth distance d4.

[0091] When the method for measuring the amount of removal from the surface of a glass workpiece according to an embodiment of the present application is used to measure the amount of removal from both sides of the glass workpiece 100, a mark 30 is formed inside the glass workpiece 100, and the first distance d1 and the second distance d2 between the first surface 10 and the second surface 20 and the mark 30 before polishing are measured, as well as the third distance d3 and the fourth distance d4 between the first polished surface 11 and the second polished surface 21 and the mark 30 after polishing are measured. The first thickness of the first surface 10 removed is obtained by the first distance d1 and the third distance d3, and the second thickness of the second surface 20 removed is obtained by the second distance d2 and the fourth distance d4. The amount of removal from both sides of the glass workpiece can be accurately obtained. The method for measuring the amount of removal from the surface of a glass workpiece according to an embodiment of the present application is simple to operate and increases the convenience of measurement. In addition, since the mark 30 is set inside the glass workpiece 100 and is small in size and invisible to the naked eye, damage to the surface of the glass workpiece 100 is avoided, ensuring that the glass workpiece 100 can be used normally in the future.

[0092] Please also refer to Figure 1 、 Figure 3 and Figure 10 In the embodiment of the present application, before step S4, the method for measuring the surface removal amount of the glass workpiece 100 may further include:

[0093] Step S30 , defining an area where the mark 30 may be set according to the preset position of the mark 30 set in the glass workpiece 100 .

[0094] Specifically, when the mark 30 is set in the glass workpiece 100, it will be set according to the preset position, but there will be a certain deviation between the actual setting position and the preset position. In order to be able to identify the smaller-sized mark 30, the area where the mark 30 may be set can be delineated according to the preset position of the mark 30, and then the area where the mark 30 may be set can be identified.

[0095] In step S31 , the main camera 241 performs image recognition on the area where the marker 30 may be located, and recognizes the marker 30 in the acquired image.

[0096] Specifically, since the mark 30 is small in size and invisible to the naked eye, in order to move the mark 30 to a position directly below the main camera 241, and thereby facilitate the main camera 241 to gradually move toward the mark 30 along the first direction to obtain an image of the front surface of the glass workpiece 100 and the mark 30, it is necessary to use the main camera 241 to perform image recognition on the area where the mark 30 may be set, thereby identifying the mark 30 in the acquired image, and then moving the glass workpiece 100 according to the offset of the mark 30 so that the mark 30 is located directly below the main camera 241.

[0097] See also Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 In the embodiment of the present application, before step S10, the method for measuring the amount of removal from the surface of a glass workpiece in the embodiment of the present application may further include the following steps:

[0098] Step S90 , judging whether the remaining total thickness of the glass workpiece 100 after polishing meets the requirement based on the third distance d3 and the fourth distance d4 .

[0099] Specifically, since the thickness of the mark 30 is extremely small, the sum of the third distance d3 and the fourth distance d4 is the total thickness remaining after polishing the glass workpiece 100. By determining whether the total thickness remaining after polishing the glass workpiece 100 meets the requirements, it is possible to preliminarily determine whether the first surface 10 and the second surface 20 are qualified after polishing. If the polishing of the first surface 10 and the second surface 20 is preliminarily determined to be qualified, step S10 is executed to further determine whether the removal amount on both sides of the glass workpiece 100 is consistent. If the polishing of the first surface 10 and the second surface 20 is preliminarily determined to be unqualified, steps S6 and S8 are re-executed to polish the first surface 10 and the second surface 20 of the glass workpiece 100, provided that the polishing process continues, and the third distance d3 and the fourth distance d4 are re-measured. In this way, by judging whether the total thickness remaining after polishing of the glass workpiece 100 meets the requirements through the third distance d3 and the fourth distance d4, it is possible to effectively avoid the situation where the removal amount on both sides of the glass workpiece 100 is consistent but the total thickness after polishing does not meet the requirements, and further ensure that the removal amount on both sides of the glass workpiece 100 can meet the processing requirements.

[0100] In some other embodiments, the mark 30 may include multiple marking points set at intervals, the first distance d1 and the third distance d3 are respectively the average values ​​of the distances between the first surface 10 and the first polishing surface 11 and the multiple marking points, and the second distance d2 and the fourth distance d4 are respectively the average values ​​of the distances between the second surface 20 and the second polishing surface 21 and the multiple marking points.

[0101] Specifically, multiple marking points are spaced apart within the glass workpiece 100. When executing steps S4 and S6 to obtain the first distance d1 and the third distance d3, the distances between each marking point and the first surface 10 and the first polished surface 11 need to be measured separately, and the average value of the distances between each marking point and the first surface 10 is used as the first distance d1, and the average value of the distances between each marking point and the first polished surface 11 is used as the third distance d3. Similarly, when executing steps S4 and S8 to obtain the second distance d2 and the fourth distance d4, the distances between each marking point and the second surface 20 and the second polished surface 21 need to be measured separately, and the average value of the distances between each marking point and the second surface 20 is used as the second distance d2, and the average value of the distances between each marking point and the second polished surface 21 is used as the fourth distance d4. In this way, the situation in which large errors in the first distance d1, the second distance d2, the third distance d3, and the fourth distance d4 measured when only one marking point is set can be effectively avoided, further ensuring the accuracy of measuring the double-sided removal amount of the glass workpiece 100.

[0102] In some other embodiments, the mark 30 may include a plurality of marking points arranged at intervals, the removal thickness of the first surface 10 corresponding to at least one marking point is different from the removal thickness of the first surface 10 corresponding to other marking points, and the third distance d3 is a set of distances between the first polishing surface 11 with different removal thicknesses and the corresponding plurality of marking points.

[0103] Specifically, a plurality of marking points are spaced apart within the glass workpiece 100. When polishing the glass workpiece 100 from the first surface 10 thereof, the thickness removed from the first surface 10 corresponding to at least one marking point is different from the thickness removed from the first surface 10 corresponding to the other marking points. When executing step S6 to obtain the third distance d3, it is necessary to measure the distance between each marking point and the corresponding removal position of the first polishing surface 11, and then form all the measured data into a data set, and the data set is combined as the third distance d3. When calculating the first thickness, the first distance d1 is subtracted from each data in the third distance d3, and a data set is obtained as the first thickness. Similarly, when the thickness removed from the second surface 20 corresponding to at least one marking point is different from the thickness removed from the second surface 20 corresponding to the other marking points, the method for calculating the fourth distance d4 and the second thickness is the same as the method for calculating the third distance d3 and the first thickness, and will not be repeated here. In this way, by comparing whether the first thickness and the second thickness are the same, it is possible to determine whether the various removal amounts on the first surface 10 are the same as the various removal amounts on the second surface 20, thereby meeting the measurement requirements when both sides of the glass workpiece 100 have various removal amounts.

[0104] See also Figure 2 and Figure 10 In step S41, step S412 may further include:

[0105] In step S4120, an abnormal area is defined in the image of the front surface of the glass workpiece 100 recognized by the main camera 241. The correction camera 242 is gradually moved along the first direction toward the mark 30 according to the second step distance, with the position where the main camera 242 stops moving as the starting point. The correction area of ​​the front surface of the glass workpiece 100 corresponding to the abnormal area is image recognized. The main camera 241 moves synchronously with the movement of the correction camera 242. When the correction camera 242 recognizes the front surface of the glass workpiece 100 in the correction area, the correction camera 242 and the main camera 241 stop moving. The position of the correction camera 242 at this time is used as the starting position Z0 of the movement of the calibrated main camera 241, wherein the second step distance is smaller than the first step distance.

[0106] Specifically, if Figure 8 As shown, when the surface of the glass workpiece 100 includes a protrusion or impurities such as dust, gray and white ripples and a dark gray impurity area appear in the image of the front surface of the glass workpiece 100 recognized by the main camera 241. When gray and white ripples also appear around the dark gray impurity area, it is determined that the main camera 241 has recognized the upper surface of the protrusion or impurity. At this time, the main camera 241 stops moving and determines that the current position of the main camera 241 is Z0 ’ If the position Z0 where the main camera 241 is located at this time ’ If the height of the protrusions or impurities is used as the starting position for movement Z0, a large error will be caused in the subsequent calculation of the depth H of the mark 30 because the height of the protrusions or impurities will be included in the calculation. In this case, it is necessary to manually screen and delineate the abnormal area containing impurities in the image of the front surface of the glass workpiece 100. Generally, areas with large and dense protrusions or impurities will appear as black spots or black blocks surrounded by gray and white ripples in the image of the front surface of the glass workpiece 100 recognized by the main camera 241. Therefore, the abnormal area with corresponding characteristics is specifically delineated, and an instruction is issued to drive the correction camera 242 from Z0 with a smaller second step distance. ’ The position moves along the first direction and performs three-dimensional image recognition on the correction area corresponding to the demarcated abnormal area, and measures the flatness of the correction area during the image recognition process, that is, the correction camera 242 can display different colors in the three-dimensional image according to the height of the protrusion or impurity, such as from green, yellow to red, indicating that the height of the protrusion or impurity is getting higher. When the correction camera 242 recognizes that Figure 9When the image shown contains gray and white stripes and a dark gray impurity region not surrounded by any gray and white ripples, it indicates that the calibration camera 242 has recognized the actual front surface of the glass workpiece 100 in the calibration region. At this point, the drive assembly 230 stops driving the main camera 241 and the calibration camera 242, and uses the current position of the calibration camera 242 as the starting position Z0 for the calibrated main camera 241. This effectively reduces the impact of bumps or impurities on the surface of the glass workpiece 100 on the subsequent calculation of the depth H of the mark 30, thereby improving the accuracy of the measured distance between the mark 30 and the surface of the glass workpiece 100.

[0107] See also Figure 10 and Figure 11 The embodiment of the present application provides a measuring device 200 for measuring the amount of material removed from the surface of a glass workpiece 100. A mark 30 is formed in the glass workpiece 100. The measuring device 200 includes a supporting assembly 220, a driving assembly 230, a camera assembly 240, a displacement sensor 250, and a controller 260. The supporting assembly 220 is used to support the glass workpiece 100 and position the glass workpiece 100. The driving assembly 230 is disposed adjacent to the supporting assembly 220. The camera assembly 240 is connected to the driving assembly 230. The driving assembly 230 is used to drive the camera assembly 240 to move. The camera assembly 240 is used to capture images of the mark 30 and the surface of the glass workpiece 100. The displacement sensor 250 is disposed on the driving assembly 230 and is used to sense the movement position of the driving assembly 230. The controller 260 is coupled to the driving assembly 230, the camera assembly 240 and the displacement sensor 250. The controller 260 receives the image acquired by the camera assembly 240 and the position information sensed by the displacement sensor 250, and obtains the distance between the mark 30 and the initial surface of the glass workpiece 100 and the distance between the mark 30 and the polished surface obtained after the glass workpiece 100 is processed based on the position information sensed by the displacement sensor 250 when the camera assembly 240 acquires the image of the mark 30 and the surface of the glass workpiece 100, thereby obtaining the removal amount of the glass workpiece 100.

[0108] Specifically, the measuring device 200 may further include a platform 210 . The platform 210 includes a base 211 and a mounting frame 212 . The mounting frame 212 is disposed on the base 211 .

[0109] In one embodiment, the supporting assembly 220 may include a support base 221, a supporting plate 222, a positioning pin 223, a first adjustment rod 224, and a second adjustment rod 225. The support base 221 is disposed on the base 211 and is located on one side of the mounting frame 212. The supporting plate 222 is slidably disposed on the support base 221 for supporting the glass workpiece 100 to be measured. The positioning pins 223 are inserted into the supporting plate 222 at intervals for positioning the glass workpiece 100. The first adjustment rod 224 and the second adjustment rod 225 are inserted into the support base 221 along the third direction and the second direction, respectively, and abut against the supporting plate 222. The first adjustment rod 224 is configured to drive the supporting plate 222 to move along the third direction when screwed, and the second adjustment rod 225 is configured to drive the supporting plate 222 to move along the second direction when screwed, thereby enabling the supporting plate 222 to drive the glass workpiece 100 to be measured to move in the third and second directions to directly below the camera assembly 240 and position the glass workpiece 100.

[0110] In one embodiment, the drive assembly 230 may include a drive motor 231, a slide rod 232, a slide seat 233, and a drive screw 234. The drive motor 231 is capable of outputting a stepper drive and is mounted on the mounting frame 212 and positioned above the support seat 221. Two slide rods 232 are spaced apart on the mounting frame 212 and positioned between the drive motor 231 and the support seat 221, with both slide rods 232 extending in a first direction. The slide seat 233 is slidably mounted on the two slide rods 232. The output end of the drive motor 231 is connected to the slide seat 233 via the drive screw 234 to drive the slide seat 233 toward and away from the support seat 221. The camera assembly 240 and the displacement sensor 250 are both arranged on the slide 233. When the drive motor 231 drives the slide 233 to move along the first direction toward the support seat 221, the camera assembly 240 can obtain images of the mark 30 and the surface of the glass workpiece 100 during the movement, and the displacement sensor 250 can sense the moving position of the slide 233, thereby obtaining the moving position information of the camera assembly 240.

[0111] In one embodiment, the camera assembly 240 includes a main camera 241 and a correction camera 242. The main camera 241 and the correction camera 242 are both coupled to the controller 260. The main camera 241 and the correction camera 242 are respectively used to move stepwise along the first direction toward the glass workpiece 100 according to the first step distance and the second step distance under the drive of the driving assembly 230, and perform image recognition on the glass workpiece 100 and the mark 30 during the movement, and then transmit the recognized images of the glass workpiece 100 and the mark 30 to the controller 260.

[0112] Specifically, both the main camera 241 and the calibration camera 242 can be industrial cameras. The main camera 241 is mounted on the slide 233, and the calibration camera 242 is mounted on the main camera 241. Based on the image of the surface of the glass workpiece 100 captured by the main camera 241, the calibration camera 242, driven by the drive assembly 230, can perform three-dimensional image recognition on the calibration area of ​​the surface of the glass workpiece 100 corresponding to a certain abnormal area, and during the three-dimensional image recognition process, measure the flatness of any protrusions or impurities in the calibration area. The first step distance that the driving component 230 drives the main camera 242 to move along the first direction is greater than the second step distance that the driving component 230 drives the correction camera 242 to move along the first direction. Since the size of the protrusions or impurities on the surface of the glass workpiece 100 is small, when the correction camera 242 performs image recognition on the correction area with a smaller step distance, the correction camera 242 can construct a three-dimensional image of the protrusions or impurities based on the acquired image, and then obtain the height of the protrusions or impurities based on the position information of the displacement sensor 250, thereby effectively reducing the impact of the protrusions or impurities on the surface of the glass workpiece 100 on the subsequent calculation of the distance between the mark 30 and the surface of the glass workpiece 100, thereby improving the accuracy of the measured distance between the mark 30 and the surface of the glass workpiece 100.

[0113] In one embodiment, the controller 260 may be a control box mounted on the mounting frame 212. The controller 260 primarily provides computing, storage, data processing, and control functions for the entire measuring device 200. The controller 260 is capable of correlating and storing images captured by the main camera 241 and position information acquired by the displacement sensor 250. The controller 260 also stores a software module that implements an energy gradient algorithm. This software module processes images of the marker 30 at different depths captured by the main camera 241 during movement, thereby determining the clarity of each image.

[0114] When using the measuring device 200 of the embodiment of the present application to measure the removal amount of the glass workpiece 100 to be measured, it is necessary to place the glass workpiece 100 before polishing and the glass workpiece 100 after polishing respectively on the supporting assembly 220 for measurement, and then measure the distance between the mark 30 and the initial surface of the glass workpiece 100 and the distance between the mark 30 and the polished surface obtained after processing the glass workpiece 100. The specific measurement process can be referred to the above steps S41-S44, and the embodiment of the present application will not be repeated here.

[0115] In this way, the measuring device 200 of the embodiment of the present application drives the camera assembly 240 to move via the driving assembly 230. The camera assembly 240 acquires images of the mark 30 and the surface of the glass workpiece 100. The displacement sensor 250 senses the movement position of the driving assembly 230. Then, the controller 260 obtains the distance between the mark 30 and the initial surface of the glass workpiece 100 and the distance between the mark 30 and the polished surface obtained after processing the glass workpiece 100 based on the position information sensed by the displacement sensor 250 when the camera assembly 240 acquires the images of the mark 30 and the surface of the glass workpiece 100. This achieves the function of measuring the removal amount of both sides of the glass workpiece 100 without damaging the surface of the glass workpiece 100, ensuring that the glass workpiece 100 can be used normally in the future. In addition, the measuring device 200 of the embodiment of the present application is simple to operate and increases the convenience of measurement.

[0116] It will be apparent to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present application is defined by the appended claims rather than the foregoing description, and all variations that come within the meaning and range of equivalents of the claims are intended to be embraced herein.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A method for measuring the amount of glass workpiece surface removal, characterized in that: include: Providing a glass workpiece having a first surface and a second surface opposite to each other, wherein a mark is formed inside the glass workpiece; Measuring a first distance between the mark and the first surface and a second distance between the mark and the second surface respectively, comprising: moving a main camera stepwise along a first direction from above the front surface of the glass workpiece toward the mark according to a first step distance and performing image recognition on the front surface of the glass workpiece, stopping movement when the main camera recognizes the front surface of the glass workpiece, and recording the position of the main camera at this time as a movement starting position Z0, wherein the front surface is one of the first surface and the second surface; The main camera is caused to gradually move from the movement starting position Z0 toward the mark according to a first step distance along the first direction and perform image recognition on the mark until it reaches a maximum movement distance and stops, and the position reached when the image recognition of the mark is performed each time during the movement is recorded, wherein the maximum movement distance is greater than the distance between a preset position of the mark set in the glass workpiece and the front surface, and the first direction is perpendicular to the front surface; According to the images of the marker at different depths acquired during the movement, the clarity of each image is obtained by an energy gradient algorithm, and the arrival position corresponding to the image with the highest clarity is obtained according to the clarity value, and the arrival position is recorded as the true depth position Z1; The depth H of the mark is obtained according to the movement starting position Z0, the true depth position Z1 and the refractive index K of the glass workpiece, where H=(Z1-Z0)×K; Using the depth H of the mark as the value of one of the corresponding first distance and the second distance; After polishing the glass workpiece from the first surface side to obtain a first polished surface, measuring a third distance between the first polished surface and the mark; After polishing the glass workpiece from the second surface side to obtain a second polished surface, measuring a fourth distance between the second polished surface and the mark; A first thickness removed from the first surface is obtained according to the first distance and the third distance, and a second thickness removed from the second surface is obtained according to the second distance and the fourth distance.

2. The method for measuring the amount of glass workpiece surface removal according to claim 1, wherein: The method for measuring the amount of removal from the surface of a glass workpiece further comprises: It is determined whether the remaining total thickness of the glass workpiece after polishing meets the requirement according to the third distance and the fourth distance.

3. The method for measuring the amount of glass workpiece surface removal according to claim 1, wherein: The glass workpiece includes a first edge and a second edge adjacent to each other, and the mark is a point close to a junction of the first edge and the second edge.

4. The method for measuring the amount of removal from the surface of a glass workpiece according to claim 3, wherein: The distances between the mark and the first edge and the second edge are the same, and the distances between the mark and the first edge and the second edge range from 3 mm to 10 mm.

5. The method for measuring the amount of removal from the surface of a glass workpiece according to claim 3, wherein: The diameter of the mark ranges from 0.001 mm to 0.006 mm.

6. The method for measuring the amount of glass workpiece surface removal according to claim 1, wherein: The mark includes a plurality of marking points arranged at intervals, the first distance and the third distance are respectively the average values ​​of the distances between the first surface and the first polishing surface and the plurality of marking points, and the second distance and the fourth distance are respectively the average values ​​of the distances between the second surface and the second polishing surface and the plurality of marking points.

7. The method for measuring the amount of glass workpiece surface removal according to claim 1, wherein: The mark includes a plurality of marking points arranged at intervals, the removal thickness of the first surface corresponding to at least one of the marking points is different from the removal thickness of the first surface corresponding to other marking points, and the third distance is a set of distances between the first polishing surface with different removal thicknesses and the corresponding plurality of marking points.

8. The method for measuring the amount of glass workpiece surface removal according to claim 1, wherein: The method further comprises: The mark is formed inside the glass workpiece by laser.

9. The method for measuring the amount of glass workpiece surface removal according to claim 1, wherein: Before the step of respectively measuring the first distance between the mark and the first surface and the second distance between the mark and the second surface, the method for measuring the amount of surface removal of a glass workpiece further comprises: demarcating an area where the mark may be located according to a preset position of the mark in the glass workpiece; The main camera performs image recognition on the area where the mark may be set, and recognizes the mark in the acquired image.

10. The method for measuring the amount of glass workpiece surface removal according to claim 1, wherein: The maximum moving distance is less than or equal to the maximum thickness of the glass workpiece.

11. The method for measuring the amount of glass workpiece surface removal according to claim 1, wherein: The method of stopping movement when the main camera recognizes the front surface of the glass workpiece and recording the position of the main camera at this time as the movement starting position Z0 includes: An abnormal area is delineated in the image of the front surface of the glass workpiece recognized by the main camera, and the correction camera is gradually moved along the first direction toward the mark according to a second step distance, with the position where the main camera stops moving as the starting point, and image recognition is performed on the correction area of ​​the front surface of the glass workpiece corresponding to the abnormal area. The main camera moves synchronously with the movement of the correction camera. When the correction camera recognizes the front surface of the glass workpiece within the correction area, the correction camera and the main camera are stopped, and the position of the correction camera at this time is used as the starting position Z0 of the movement of the corrected main camera, wherein the second step distance is smaller than the first step distance.

12. A measuring device, characterized in that: Used to measure the amount of surface removal of a glass workpiece, wherein a mark is formed in the glass workpiece, the measuring device comprises: A bearing assembly, used for bearing the glass workpiece and positioning the glass workpiece; a driving assembly, disposed adjacent to the bearing assembly; a camera assembly connected to the driving assembly, the driving assembly being used to drive the camera assembly to move, the camera assembly being used to acquire images of the mark and the surface of the glass workpiece, the camera assembly comprising a main camera; a displacement sensor, provided on the driving assembly, for sensing the moving position of the driving assembly; a controller coupled to the drive assembly, the camera assembly, and the displacement sensor, the controller receiving an image captured by the camera assembly and position information sensed by the displacement sensor, and obtaining a distance between the mark and an initial surface of the glass workpiece and a distance between the mark and a polished surface obtained after processing the glass workpiece based on the position information sensed by the displacement sensor when the camera assembly captures an image of the mark and the surface of the glass workpiece, thereby obtaining an amount of material removed from the glass workpiece; Wherein, obtaining the distance between the mark and the initial surface of the glass workpiece and the distance between the mark and the polished surface obtained after processing the glass workpiece based on the position information sensed by the displacement sensor when the camera assembly acquires the image of the mark and the surface of the glass workpiece comprises: The main camera is caused to gradually move from above the front surface of the glass workpiece toward the mark along a first direction according to a first step distance and perform image recognition on the front surface of the glass workpiece, and the main camera stops moving when it recognizes the front surface of the glass workpiece, and the position of the main camera at this time is recorded as a movement starting position Z0, wherein the front surface is one of the initial surface and the polished surface; The main camera is caused to gradually move from the movement starting position Z0 toward the mark according to a first step distance along the first direction and perform image recognition on the mark until it reaches a maximum movement distance and stops, and the position reached when the image recognition of the mark is performed each time during the movement is recorded, wherein the maximum movement distance is greater than the distance between a preset position of the mark set in the glass workpiece and the front surface, and the first direction is perpendicular to the front surface; According to the images of the marker at different depths acquired during the movement, the clarity of each image is obtained by an energy gradient algorithm, and the arrival position corresponding to the image with the highest clarity is obtained according to the clarity value, and the arrival position is recorded as the true depth position Z1; The depth H of the mark is obtained according to the movement starting position Z0, the true depth position Z1 and the refractive index K of the glass workpiece, where H=(Z1-Z0)×K; The depth H of the mark is taken as the value of the distance between the mark and the front surface.

13. The measuring device according to claim 12, wherein The camera assembly also includes a correction camera. Both the main camera and the correction camera are coupled to the controller. The main camera and the correction camera are respectively used to move stepwise along a first direction toward the glass workpiece according to a first step distance and a second step distance under the drive of the driving assembly, and perform image recognition on the surface of the glass workpiece and the mark during the movement, and then transmit the recognized images of the glass workpiece surface and the mark to the controller.

Images