Cover glass bulge defect inspection device

Abstract

This invention discloses a device for inspecting bulge defects in cover glass, belonging to the field of cover glass defect detection technology. The technical solution includes a water tank with an inlet pipe, a glass fixing platform below the water outlet, and the glass being fixed at an angle on the glass fixing platform. A weighing platform is located below the glass fixing platform, and several electronic scales are spaced apart along the length of the glass fixing platform. This invention, by employing the principle of blocking water flow due to bulge defects in the cover glass, can accurately and effectively detect the location and defect level of the bulge defects.

Description

Technical Field

[0001] This invention relates to the field of cover glass defect detection technology, specifically to a cover glass protrusion defect inspection device. Background Technology

[0002] The outermost protective glass of a display screen is called cover glass. After being chemically or physically strengthened, cover glass has the properties of being impact-resistant and scratch-resistant. After a coating process, it has the functions of increasing projection and preventing fingerprints. Therefore, cover glass is an indispensable material in the display industry.

[0003] Semi-finished cover glass typically measures 1-2 meters in length and width. Depending on customer requirements, the semi-finished cover glass undergoes processes such as cutting, CNC machining, strengthening, screen printing, and coating to ultimately become finished cover glass meeting customer specifications. To ensure the cover glass meets customer requirements, defect detection is essential during the manufacturing process. Over 70% of defects are raised defects, including dirt, deformation, roller marks, and scratches. Accurately and effectively detecting raised defects has always been a challenge in the industry.

[0004] Currently, the most effective inspection method for industrial automation is Automated Optical Inspection (AOI). However, this method is very costly in the cover glass industry, and due to the complexity of the processing steps and poor coordination between different processes, it is not suitable for production lines. Traditional inspection methods, which use auxiliary tools such as three-wave lamps and ionizers in a darkroom, suffer from problems such as strong subjective judgment and a high risk of missed detections. 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 cover glass protrusion defect inspection device. By adopting the principle of blocking water flow due to cover glass protrusion defects, the device can accurately and effectively detect the location and defect level of protrusion defects.

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

[0007] The cover glass bulge defect inspection device includes a water tank with a water inlet pipe. A glass fixing platform is set below the water outlet of the water tank. The glass is fixed at an angle on the glass fixing platform. A weighing platform is set below the glass fixing platform. Several electronic scales are set at intervals along the length of the glass fixing platform on the weighing platform.

[0008] Preferably, the glass fixing platform is provided with a plurality of vacuum adsorption holes, and the glass is adsorbed and fixed on the glass fixing platform.

[0009] Preferably, water dividers are vertically arranged on both sides of the water outlet of the water tank, with the two water dividers abutting against the two sides of the glass respectively. A drainage channel is connected to the bottom of the water dividers, and the drainage channel extends outward from the side of the glass. Water flowing out of the water outlet of the water tank flows into the drainage channel and is discharged.

[0010] Preferably, a sliding groove is horizontally provided at the water outlet of the water tank, and a slider is provided on the water distribution plate, with the water distribution plate slidably connected to the water outlet via the slider.

[0011] Preferably, the water inlet pipe is equipped with a flow regulating valve.

[0012] Preferably, the outlet of the water tank is higher than the connection end between the inlet pipe and the water tank.

[0013] Preferably, one end of the weighing platform is connected to a motor, which drives the weighing platform to rotate.

[0014] Preferably, hydraulic cylinders are provided at both ends of the bottom of the water tank.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] When the device of this invention detects protrusion defects, it utilizes the fluidity of the fluid. Typically, the surface roughness (0-0.8 mm) of the cover glass is ≤0.05 μm, and the waviness (0-0.8 mm) is ≤0.08 μm. When the liquid is subjected to force on the glass surface, it will flow uniformly and flatly along the direction of the force (e.g., Figure 4 (As shown); When a protrusion appears on the glass surface, the protrusion will obstruct the flow of liquid, thereby reducing the liquid flow rate at the protrusion (e.g., Figure 5 (As shown). Therefore, by measuring the change in flow rate of liquid after passing over the glass surface, the presence of protrusions or defects on the glass surface can be detected. This invention utilizes the principle that protrusions in the cover glass block water flow, enabling accurate and effective detection of the location and defect level of protrusions or defects. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a front view of the device of the present invention.

[0019] Figure 2 This is a side view of the device of the present invention.

[0020] Figure 3 yes Figure 2A magnified view of a portion at point A.

[0021] Figure 4 This is a schematic diagram of liquid flowing along a glass surface without any bumps or defects.

[0022] Figure 5 This is a schematic diagram of liquid flowing along a glass surface with imperfections.

[0023] Figure 6 These are the data recorded on the X and Y axes in Embodiment 2 of the present invention.

[0024] Figure 7 These are the defect level determination results of the two protrusion defects measured in Embodiment 2 of the present invention.

[0025] In the diagram, 1 is the water tank; 101 is the water outlet; 2 is the water inlet pipe; 201 is the flow regulating valve; 3 is the glass fixing platform; 4 is the glass; 501 is the weighing platform; 502 is the electronic scale; 601 is the water distribution plate; 602 is the drainage trough; 603 is the slider; and 7 is the hydraulic cylinder. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0027] Example 1

[0028] like Figure 1-2 As shown, this embodiment provides a device for inspecting bulge defects in cover glass, including a water tank 1, with three water inlet pipes 2 and a flow regulating valve 201 on each water inlet pipe 2; a glass fixing platform 3 is provided below the water outlet 101 of the water tank 1, and a plurality of vacuum adsorption holes are provided on the glass fixing platform 3, with the glass 4 being inclinedly adsorbed and fixed on the glass fixing platform 3; a weighing platform 501 is provided below the glass fixing platform 3, and a plurality of electronic scales 502 are spaced apart on the weighing platform 501 along the length direction of the glass fixing platform 3.

[0029] Furthermore, since the width of the water outlet 101 of the water tank 1 is greater than the width of the glass 4, the pure water flowing out from both sides of the water outlet 101 of the water tank 1 will not flow onto the surface of the glass 4. Therefore, to avoid waste, such as Figure 1-2As shown, water dividing plates 601 can be vertically installed on both sides of the water outlet 101 of the water tank 1. The two dividing plates 601 respectively abut against the two sides of the glass 4. A drainage trough 602 is connected to the bottom of the dividing plates 601, extending outwards from the side of the glass 4. When water flows down the wall of the water tank 1 from both sides of the outlet 101, it is divided into two streams by the dividing plates 601. One stream continues downwards to the surface of the glass 4, while the other flows into the drainage trough 602 below and then along the drain pipe to a collection tank for unified recycling. To accommodate glass 4 of different sizes, the dividing plates 601 can be configured to... Figure 3 As shown, a chute can be provided on the side wall of the outlet 101 of the water tank 1. The water distribution plate 601 is slidably connected to the outlet 101 via the slider 603. Thus, by moving the water distribution plate 601 so that its two ends abut against the two sides of the glass 4, the water that does not flow to the surface of the glass 4 is collected into the drainage trough 602.

[0030] In addition, such as Figure 2 As shown, the height of the water outlet 101 of the water tank 1 can be designed to be higher than the connection end between the water inlet pipe 2 and the water tank 1. This way, during operation, pure water enters from the inside of the water tank 1, avoiding water ripples during water intake that could ultimately affect the test results. Furthermore, a motor can be connected to one end of the weighing platform 501. After the test is completed, the motor drives the weighing platform 501 to rotate, emptying the water from the electronic scale 502. Simultaneously, as... Figure 1-2 As shown, hydraulic cylinders 7 can be installed at both ends of the bottom of the water tank 1. These cylinders can be used to adjust the water outlet 101 of the water tank 1 to a horizontal position, ensuring uniform and flat water flow. The water outlet 101 can be polished to meet the surface roughness requirement of (0-0.8mm) ≤ 0.05μm, guaranteeing uniform and flat pure water flow. This embodiment uses pure water because it contains no other impurities, resulting in more accurate measurement results. Furthermore, pure water has low viscosity, flows quickly, and has a short detection time, leading to high efficiency.

[0031] The method for inspecting glass bulge defects using the apparatus of this embodiment is as follows:

[0032] S1 device calibration: Observe whether pure water flows out simultaneously from all outlets 101 of water tank 1. If not, adjust the hydraulic cylinders 7 on the left and right sides of water tank 1 to make pure water flow out evenly from all outlets 101 simultaneously. Check whether the glass fixing platform 3 can perform normal vacuum adsorption and check whether the electronic scale 502 is working properly.

[0033] S2 Preparation of the glass to be tested: Mark one corner of glass 4 with a marker to distinguish the front and back of glass 4 and mark the direction of water flow.

[0034] S3 Protrusion Defect Inspection Process: Select the glass surface to be tested (e.g., the front of glass 4), and fix glass 4 upright on the glass fixing platform 3 in a certain direction (e.g., placing it longitudinally along the long side). Figure 1-2 As shown, the top of the adsorbed glass 4 is pressed tightly against the lower side wall of the water outlet 101, and the bottom of the glass 4 is positioned above the electronic scale 502, facilitating the subsequent flow of pure water into the electronic scale 502. The positions of the drain channels 602 on the left and right sides below the water outlet 101 are adjusted by the slider 603 to ensure they are close to the sides of the glass 4. Then, the flow rate of pure water in the water inlet pipe 2 is adjusted to 0.01 L / s by the flow regulating valve 201 on the water inlet pipe 2. Timing begins when pure water flows out of the water outlet 101. Due to gravity, the water flows from top to bottom across the surface of the glass 4, and excess water on both sides is collected by the drain channels 602. After timing for 1 minute, the flow regulating valve 201 on the water inlet pipe 2 is closed, and the pure water stops flowing out. After all the water on the surface of the glass 4 has flowed into the electronic scale 502, the reading begins. This process is repeated to measure the glass 4 when it is placed with its short side longitudinally and the reverse side of the glass 4.

[0035] S4 Data Recording and Result Judgment: Due to the different dimensions of glass 4, the outermost edge of glass 4 cannot be exactly the same width as a single electronic scale 502 during the detection of protrusion defects. Therefore, the data of the outermost edge of the electronic scale 502 on each side of glass 4 is not recorded and is not used as a judgment of protrusion defects (in the subsequent processing, the four sides of glass 4 are often cut off). Based on the position of the electronic scale 502 corresponding to the glass 4, the data measured when the long side of the front is placed vertically is recorded on the Y-axis, and the data measured when the short side of the front is placed vertically is recorded on the X-axis, thus establishing the plane coordinate system of glass 4.

[0036] The criteria for judging bulge defects are as follows: if the weight of water in the other electronic scales 502s is less than 5% of the average weight, excluding the weight of the outermost electronic scale 502 on each surface, then it is determined that there is a bulge defect on the glass 4 coordinate corresponding to that electronic scale 502; the bulge defect level can also be divided according to how much the weight of water in the electronic scale 502 is lower than the average weight: if it is 5-10% lower than the average weight, it is a grade A defect, 10-20% is a grade B defect, and ≥20% is a grade C defect. The degree of impact on the quality of glass 4 is grade C > grade B > grade A.

[0037] S5 Measurement Result Self-Review: After the test, if you want to confirm whether the device is faulty or to confirm the accuracy of the data, you can self-review the data. That is, the total water output of a single test = the weight displayed by the outermost electronic scale 502 + the weight discharged by the drain trough 602 + the recorded weight.

[0038] Example 2

[0039] The apparatus of Example 1 was used to detect front-side convexity defects in the cover glass sample:

[0040] The flow rate of the three inlet pipes 2 is controlled to be 0.01L / s by the flow regulating valve 201. The measurement time is 1 minute. Therefore, the water inlet during the test is 0.01L / s × 3 × 60s = 1.8L. The total weight of the water inlet is 1.8L × 1000g / L = 1800g.

[0041] After the frontal test, the data was recorded as follows:

[0042] like Figure 6 As shown, when the long side of glass 4 is placed longitudinally, the measured data is recorded on the Y-axis. Excluding the "a" and "k" at the edges, there are a total of 9 sets of data, with an average value of 178g. Therefore, any area below 178g × 5% = 169.1g can be considered a protruding defect. Furthermore, calculations show that protruding defects with a pure water weight of 160.2-169.1g are classified as Grade A defects, those with a pure water weight of 142.4-160.2g as Grade B defects, and those with a pure water weight ≤ 142.4g as Grade C defects.

[0043] like Figure 6 As shown, when the short side of glass 4 is placed longitudinally, the measured data is recorded on the X-axis. Excluding the "1" and "2" at the edge, there are 12 sets of data, with an average value of 133.7g. Therefore, any weight below 133.7g × 5% = 127.1g can be considered a protrusion defect. Furthermore, calculations show that protrusion defects with a pure water weight of 120.4-127.1g are classified as Grade A defects, those with a pure water weight of 107-120.4g as Grade B defects, and those with a pure water weight ≤ 107g as Grade C defects.

[0044] Therefore, it can be inferred from the diagram that there are protruding defects at coordinates "4e", "4h", "11e", and "11h". Verification shows that the same protruding defect has essentially the same impact when the object is placed longitudinally along the long side and longitudinally along the short side. Therefore, based on the data, it can be determined that protruding defects exist at "4e" and "11h", but not at "4h" and "11e". Furthermore, "4e" is a Class A protruding defect, and "11h" is a Class B protruding defect (e.g., ...). Figure 7 (As shown).

[0045] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the invention should also be covered within the protection scope of the invention. Therefore, the protection scope of the invention should be determined by the scope of the claims.

Claims

1. A device for inspecting cover glass bulge defects, characterized in that, The system includes a water tank (1), which is equipped with an inlet pipe (2) and a flow regulating valve (201) on the inlet pipe (2); a glass fixing platform (3) is set below the outlet (101) of the water tank (1), and the glass (4) is fixed at an angle on the glass fixing platform (3). A weighing platform (501) is set below the glass fixing platform (3), and several electronic scales (502) are set at intervals along the length of the glass fixing platform (3) on the weighing platform (501); the width of the outlet (101) of the water tank (1) is greater than the width of the glass (4), and the height of the outlet (101) of the water tank (1) is designed to be higher than the inlet pipe (2) and the water. The connection end of the tank (1); hydraulic cylinders (7) are respectively set at both ends of the bottom of the tank (1). The water outlet (101) of the tank (1) is adjusted to be horizontal by the hydraulic cylinders (7). The surface roughness of the water outlet (101) is ≤0.05μm. Water dividing plates (601) are vertically set on both sides of the water outlet (101) of the tank (1). The two water dividing plates (601) abut against the two sides of the glass (4) respectively. The bottom of the water dividing plate (601) is connected to the drainage trough (602). The drainage trough (602) extends outward from the side of the glass (4). The water flowing out of the water outlet (101) of the tank (1) flows into the drainage trough (602) and is discharged.

2. The cover glass protrusion defect inspection device as described in claim 1, characterized in that, The glass fixing platform (3) is provided with several vacuum adsorption holes, and the glass (4) is adsorbed and fixed on the glass fixing platform (3).

3. The cover glass protrusion defect inspection device as described in claim 1, characterized in that, A sliding groove is horizontally provided at the outlet (101) of the water tank (1), and a slider (603) is provided on the water distribution plate (601). The water distribution plate (601) is slidably connected to the outlet (101) through the slider (603).

4. The cover glass protrusion defect inspection device as described in claim 1, characterized in that, One end of the weighing platform (501) is connected to a motor, which drives the weighing platform (501) to rotate.

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