Method for measuring the deformation of cover glass

Abstract

This invention discloses a method for measuring the deformation of cover glass, belonging to the technical field of cover glass deformation measurement. The technical solution includes the following steps: S1 Take several pieces of cover glass, measure their warp values, and measure their actual deformation; S2 Based on the measurement results of step S1, derive a linear relationship between the warp value and the deformation of the cover glass; S3 Measure the warp value of the cover glass to be tested, and calculate its deformation based on the linear relationship. The method for measuring the deformation of cover glass in this invention does not rely on a glass template, and the obtained relationship is derived from the actual deformation of the cover glass, ensuring the calculation results are accurate and reliable.

Description

Technical Field

[0001] This invention relates to the field of cover glass deformation measurement technology, and specifically to a method for measuring cover glass deformation. Background Technology

[0002] Large cover glass plays a vital role in modern electronic devices, such as large commercial displays and televisions. However, due to various factors in the cover glass manufacturing process, the produced cover glass may have warping and deformation issues. This warping and deformation can be exacerbated by gravity after the cover glass is bonded to the display panel, resulting in poor viewing experience, reduced touch sensitivity, and manufacturing defects.

[0003] Research into the root causes of cover glass deformation reveals that the deformation primarily occurs when the glass sheet is cooled from a high temperature to a low temperature during the forming process in a tin bath, annealing furnace, or physical tempering furnace. As an amorphous structure, the uneven cooling curve of glass causes it to warp or dip relative to its ideal, flat surface. This phenomenon, known as glass warping during the glass sheet production process, is further amplified by gravity when the cover glass is upright, thus constituting the cover glass deformation.

[0004] To address the aforementioned issues, it is necessary to conduct deformation quality checks on the produced cover glass to ensure that it meets the requirements for actual use. Existing methods for measuring the deformation of cover glass, such as the one disclosed in Chinese invention patent CN109579773B, include the following steps: S1. Locate the center of the flat glass and place opaque obstructions at the center of both sides of the flat glass; S2. Select a template of the same size as the glass to be measured, place the template above the measuring worktable, and fix the template firmly using the glass suction cups on the measuring worktable; S3. Turn on the distance measuring instrument in the measuring worktable, measure and record the distance A between the distance measuring instrument and the lower surface of the template; S4. Place the flat glass processed in S1 above the measuring worktable and fix the flat glass firmly using the glass suction cups on the measuring worktable; S5. Turn on the distance measuring instrument in the measuring worktable, measure and record the distance B between the distance measuring instrument and the lower surface of the flat glass; S6. Flip the measured flat glass 180 degrees, measure and record the distance C between the distance measuring instrument and the other surface of the flat glass using steps S4-S5; S7. Subtract distance B and distance C from distance A and compare them. The larger value is the deformation of the glass. The measurement method in this patent relies on a glass template, and when the glass template is deformed, the measurement results will be inaccurate. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for measuring the deformation of cover glass without relying on a glass template. The obtained relationship is derived from the actual deformation of the cover glass, and the calculation results are true and reliable.

[0006] The technical solution of this invention is as follows:

[0007] The method for measuring the deformation of cover glass includes the following steps:

[0008] S1 Take several pieces of cover glass, measure their warp value, and measure their actual deformation.

[0009] Based on the measurement results of step S1, S2 derives the linear relationship between the warpage value and the deformation of the cover glass;

[0010] S3 measures the warpage value of the cover glass to be tested and calculates its deformation based on the linear relationship.

[0011] Preferably, in steps S1 and S3, a laser coordinate measuring machine is used to measure the warpage value of the cover glass.

[0012] Preferably, in step S1, the method for measuring the actual deformation of the cover glass is as follows:

[0013] 1) Place the cover glass vertically on the fixture to simulate a normal display usage scenario. Place limiters at the bottom and top of the cover glass to prevent it from falling, but the limiters should not affect the natural deformation of the cover glass to avoid interfering with the measurement results.

[0014] 2) Use fishing line or a laser generator to form theoretically parallel lines on both sides of the cover glass;

[0015] 3) Measure the distance between the theoretical parallel line and the cover glass at the measurement point of the cover glass to obtain the actual deformation value of the cover glass. One or more points can be measured, and the maximum value measured is the actual deformation value of the cover glass.

[0016] Preferably, the fixture includes several spaced columns, with a crossbar connected to the bottom of each column. Several support rods are provided on the same side of the crossbars. Limiters are provided on the columns and support rods respectively. When the cover glass is placed vertically on the fixture, the bottom is placed on the support rods, the top is held in place by the limiters, and the two sides are restricted by the columns and limiters.

[0017] Preferably, the limiter on the column includes a housing that is fitted onto the column and can slide up and down on the column. The housing is provided with a fastener to fix the housing to the column. The housing is also provided with a plurality of screws, a baffle is hung on the screw and a nut is threaded onto the screw. Tightening the nut restricts the top of the cover glass between the column and the baffle.

[0018] Preferably, the fastener is a bolt threaded onto the housing, and tightening the bolt causes it to press against the column, thereby fixing the housing to the column.

[0019] Preferably, the limiter on the support rod includes a slider that can slide on the support rod, and a second fastener is provided on the slider to fix the slider to the support rod; a second baffle is also provided on the slider, and the sliding slider restricts the bottom of the cover glass between the slider and the column, and the slider is fixed to the support rod by the second fastener.

[0020] Preferably, the second fastener is a bolt that is bolted to the slider. Tightening the bolt causes it to press against the support rod, thereby fixing the slider to the support rod.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] The measurement method of this invention utilizes an instrument to measure the warpage value of multiple cover glass plates, and then measures their actual deformation. Based on the measurement results, a linear relationship between the warpage value and the actual deformation is fitted. This allows the instrument to measure the warpage value of the cover glass to be tested, and then calculates the deformation of the cover glass based on this relationship. This method does not rely on a glass template, and the obtained relationship is derived from the actual deformation of the cover glass, ensuring accurate and reliable calculation results. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the fixture of the present invention.

[0024] Figure 2 This is a schematic diagram of the state of the cover glass after it is placed vertically on the fixture and then limited by the limiter in this invention.

[0025] Figure 3 This is a schematic diagram of the actual deformation of the cover glass in this invention.

[0026] In the diagram, 1 is the cover glass; 201 is the column; 202 is the crossbar; 203 is the support rod; 204 is the limiter; 2041 is the outer shell; 2042 is the first baffle; 2043 is the slider; and 2044 is the second baffle. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this invention.

[0028] The method for measuring the deformation of the cover glass in the following embodiments includes the following steps:

[0029] S1 Take several pieces of cover glass 1, measure their warpage value, and measure their actual deformation.

[0030] Based on the measurement results of step S1, S2 derives the linear relationship between the warpage value and deformation of the cover glass 1.

[0031] S3 measures the warpage value of the cover glass 1 to be tested and calculates its deformation based on the linear relationship.

[0032] In steps S1 and S3, the warpage value of the cover glass 1 is measured using a laser coordinate measuring machine (Dongxiangsheng Technology Elite-S series).

[0033] Furthermore, in step S1, the method for measuring the actual deformation of the cover glass 1 is as follows:

[0034] 1) Place the cover glass 1 vertically on the fixture to simulate the normal use scenario of the display. Place limiters 204 at the bottom and top of the cover glass 1 to prevent it from falling, but the limiters 204 should not affect the natural deformation of the cover glass 1 to avoid interfering with the measurement results.

[0035] 2) Use fishing line or a laser generator to form theoretically parallel lines on both sides of the cover glass 1;

[0036] 3) Measure the distance between the theoretical parallel line and the cover glass 1 at the measurement point of the cover glass 1, thus obtaining the actual deformation value of the cover glass 1 (e.g., Figure 3 As shown), it can measure one or more points (e.g. Figure 2 As shown in the figure, the maximum value measured is the actual deformation value of the cover glass 1.

[0037] Among them, such as Figure 1 As shown, the fixture includes a plurality of spaced-apart columns 201. Figure 1 The fixture includes three uprights 201, with a crossbar 202 connected to the bottom of each upright 201. Several support rods 203 are provided on the same side of the crossbar 202. Figure 1 The fixture includes two support rods 203. Limiters 204 are respectively installed on the column 201 and the support rods 203. When the cover glass 1 is placed vertically on the fixture, the bottom is placed on the support rods 203, the top is held by the limiters 204, and the two sides are restricted by the column 201 and the limiters 204.

[0038] The limiter 204 on the column 201 includes a housing 2041 that is fitted onto the column 201 and can slide up and down on the column 201. A fastener 1 is provided on the housing 2041 to fix the housing 2041 to the column 201. Specifically, the fastener 1 is a bolt threaded onto the housing 2041. Tightening the bolt causes it to press against the column 201, thereby fixing the housing 2041 to the column 201. The housing 2041 also has several screws, with a baffle 2042 hanging on each screw and a nut threaded onto each screw. Tightening the nut restricts the top of the cover glass 1 between the column 201 and the baffle 2042.

[0039] The limiter 204 on the support rod 203 includes a slider 2043 that can slide on the support rod 203. A second fastener is provided on the slider 2043 to fix the slider 2043 to the support rod 203. Specifically, the second fastener is a bolt bolted to the slider 2043. Tightening the bolt causes it to press against the support rod 203, thereby fixing the slider 2043 to the support rod 203. A second baffle 2044 is also provided on the slider 2043. Sliding the slider 2043 restricts the bottom of the cover glass 1 between the slider 2043 and the column 201, and the slider 2043 is fixed to the support rod 203 by the second fastener.

[0040] Example 1

[0041] The method for measuring the deformation of the cover glass in this embodiment is as follows:

[0042] S1: Five groups of cover glass 1 of the same model but different sizes were selected, with five pieces selected from each group, totaling twenty-five cover glass 1 pieces. The density, thickness, length, width, and weight of each cover glass 1 piece were measured. The warpage value of each cover glass 1 piece was measured using a laser coordinate measuring machine. Subsequently, the actual deformation of each cover glass 1 piece was measured using the aforementioned method. During the measurement, 50 evenly distributed points were measured according to the size of each group of cover glass 1 pieces, and the maximum deformation measured was taken as the actual deformation value. The measurement results are shown in Table 1:

[0043] Table 1

[0044]

[0045] The measured warpage values ​​and actual deformation data in Table 1 were fitted using Qrigin statistical software to obtain a linear relationship between the warpage value (X) and the actual deformation (Y):

[0046] Y = 99.85923X - 99.87686

[0047] To verify the accuracy of the fitting formula, three groups of cover glass 1 of the same model but different sizes were selected, with five pieces in each group. The density, thickness, length, width, and gravity of each cover glass 1 were measured. The warpage value of each cover glass 1 was measured using a laser coordinate measuring machine. The calculated deformation value was then calculated using the aforementioned fitting formula. Subsequently, the actual deformation of each cover glass 1 was measured. During the measurement, 50 evenly distributed points were measured according to the dimensions of each group of cover glass 1, and the maximum measured deformation value was taken as the actual deformation value. The measurement results are shown in Table 2.

[0048] Table 2

[0049]

[0050] Comparing the measurement results in Table 2, it was found that the deviation between the calculated deformation amount and the actual deformation amount obtained by the fitting formula in this embodiment is within ±0.1mm. This indicates that the deformation amount calculation formula obtained by the method of this invention can accurately calculate the deformation amount of the cover glass 1.

[0051] The measurement method of this invention utilizes a laser coordinate measuring machine to measure the warpage value of multiple cover glass panels, and then measures their actual deformation. Based on the measurement results, a linear relationship between the warpage value and the actual deformation is fitted. This allows the warpage value of the cover glass to be measured using the laser coordinate measuring machine, and the deformation of the cover glass to be calculated based on this relationship. This method does not rely on a glass template, and the obtained relationship is derived from the actual deformation of the cover glass, ensuring accurate and reliable calculation results.

Claims

1. A method for measuring the deformation of cover glass, characterized in that, Includes the following steps: S1 Take several cover glass pieces (1), measure their warp values, and measure their actual deformation; Based on the measurement results of step S1, S2 obtains the linear relationship between the warpage value and the actual deformation of the cover glass (1); S3 measures the warpage value of the cover glass (1) to be tested and calculates its deformation based on the linear relationship. In step S1, the method for measuring the actual deformation of the cover glass (1) is as follows: 1) Place the cover glass (1) vertically on the fixture to simulate the normal use of the display, and place limiters (204) at the bottom and top of the cover glass (1) to prevent it from tipping over; 2) Use fishing line or laser generator to form theoretical parallel lines on both sides of the cover glass (1); 3) Measure the distance between the theoretical parallel line and the cover glass (1) at the measurement point of the cover glass (1) to obtain the actual deformation value of the cover glass (1).

2. The method for measuring the deformation of cover glass as described in claim 1, characterized in that, In steps S1 and S3, the warpage value of the cover glass (1) is measured using a laser coordinate measuring machine.

3. The method for measuring the deformation of cover glass as described in claim 1, characterized in that, The fixture includes several spaced columns (201), with a crossbar (202) connected to the bottom of each column (201). Several support rods (203) are provided on the same side of the crossbar (202). Limiters (204) are provided on the columns (201) and the support rods (203). When the cover glass (1) is placed vertically on the fixture, the bottom is placed on the support rods (203), the top is held by the limiters (204), and the two sides are restricted by the columns (201) and the limiters (204).

4. The method for measuring the deformation of cover glass as described in claim 3, characterized in that, The limiter (204) on the column (201) includes a housing (2041) that is fitted on the column (201) and can slide up and down on the column (201). The housing (2041) is provided with a fastener to fix the housing (2041) on the column (201). The housing (2041) is also provided with several screws, and a baffle (2042) is hung on the screw and a nut is threaded on the screw. Tightening the nut restricts the top of the cover glass (1) between the column (201) and the baffle (2042).

5. The method for measuring the deformation of the cover glass as described in claim 4, characterized in that, The fastener is a bolt threaded onto the outer casing (2041). Tightening the bolt causes it to press against the column (201), thereby fixing the outer casing (2041) onto the column (201).

6. The method for measuring the deformation of cover glass as described in claim 3, characterized in that, The limiter (204) on the support rod (203) includes a slider (2043) that can slide on the support rod (203). The slider (2043) is provided with a second fastener to fix the slider (2043) on the support rod (203). The slider (2043) is also provided with a second baffle (2044). The sliding slider (2043) restricts the bottom of the cover glass (1) between the slider (2043) and the column (201), and the slider (2043) is fixed on the support rod (203) by the second fastener.

7. The method for measuring the deformation of cover glass as described in claim 6, characterized in that, The second fastener is a bolt that is bolted to the slider (2043). Tightening the bolt makes it press against the support rod (203) to fix the slider (2043) to the support rod (203).

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