Glue overflow detection device and detection method

Abstract

The invention provides an excessive glue detection device and a detection method, which are used for detecting excessive glue. The detection device comprises a bearing mechanism, a laser detection mechanism, a moving mechanism and a control device. The laser detection mechanism comprises a laser emitter and a laser detector. The laser emitter is used for emitting laser to a plurality of detection points in a to-be-detected area of the to-be-detected part. The laser detector is used for detecting laser reflected by a plurality of detection points of the to-be-detected piece. The control device is used for controlling the moving mechanism to drive the laser detection mechanism and the bearing mechanism to move relatively, so that the laser emitter performs laser dotting on a plurality of detection points of a to-be-detected area of the to-be-detected part to perform glue overflow detection, and the laser detection mechanism generates detection phase shift information; and determining whether the detection phase shift information and the reference phase shift information meet a glue overflow range or not so as to determine whether glue overflow occurs or not. Therefore, the glue overflowing condition of the display screen does not need to be inspected through destructive testing.

Description

Technical Field

[0001] The present application relates to the technical field of glue overflow detection, and in particular to a glue overflow detection device and a detection method. Background Art

[0002] The manufacturing process of electronic devices usually involves verifying the function of the display screen. In some cases, the display screen may malfunction during the testing phase. For example, when vertical lines appear on the display screen, this may be because the glue inside the display screen overflows to the touch circuit, causing the touch function to fail.

[0003] However, this glue overflow phenomenon usually exists inside the display screen, making it difficult to detect by traditional visual inspection. Therefore, the display screen often needs to be disassembled for inspection, which is a destructive test. Summary of the invention

[0004] In order to solve the above deficiencies of the prior art, it is necessary to provide a glue overflow detection device.

[0005] In addition, an embodiment of the present application also provides a method for detecting glue overflow.

[0006] The present application provides a glue overflow detection device for detecting glue overflow. The detection device includes a bearing mechanism, a laser detection mechanism, a moving mechanism and a control device. The bearing mechanism is configured to place the test piece. The laser detection mechanism includes a laser emitter and a laser detector, and the laser emitter is configured to emit laser to multiple detection points in the test area of ​​the test piece. The laser detector is configured to detect the laser reflected back through the multiple detection points of the test piece. The moving mechanism is connected to at least one of the bearing mechanism and the laser detection mechanism, and the moving mechanism is configured to drive at least one of the bearing mechanism and the laser detection mechanism so that the bearing mechanism and the laser detection mechanism move relative to each other. The control device is electrically connected to the moving mechanism and the laser detection mechanism. The control device is configured to control the moving mechanism to drive the laser detection mechanism and the bearing mechanism to move relative to each other, so that the laser emitter performs laser dotting on multiple detection points in the test area of ​​the test piece to perform glue overflow detection, so that the laser detection mechanism generates detection phase shift information. The control device is further configured to determine whether the detected phase shift information and the reference phase shift information meet a preset condition based on the detected phase shift information, and determine that glue overflow occurs in the inspected piece when the preset condition is met.

[0007] Compared with the prior art, the present application sets up a laser detection mechanism, emits laser to the inspection area of ​​the inspected part through a laser transmitter, and the laser detector detects the laser emitted back from the detection point, and drives the bearing mechanism to move relative to the laser detection mechanism through a moving mechanism, so that the laser detection mechanism generates detection phase shift information. By detecting the display screen to be detected, it is determined whether the detection phase shift information and the reference phase shift information meet the glue overflow range, thereby determining whether glue overflow occurs. Therefore, the present application does not need to use destructive testing to inspect the glue overflow of the display screen, and can provide guarantees for the structural stability and functional integrity of the product, effectively promote the optimization and improvement of the structural process, and improve the problem of poor product function caused by glue overflow. Moreover, the thermal signal reflected by the medium at the detection point is converted into a stable phase shift value. When the medium changes, the phase shift value differs, which indirectly reflects the glue overflow condition inside the product. Therefore, the above-mentioned laser detection mechanism does not damage the product and will not cause product defects.

[0008] In some embodiments of the present application, determining whether the detected phase shift information and the reference phase shift information meet a preset condition, and determining that the test piece has glue overflow when the preset condition is met, includes determining a phase shift difference between the detected phase shift information and the reference phase shift information. Determining whether the phase shift difference meets a preset range, and determining the degree of glue overflow of the test piece.

[0009] In some embodiments of the present application, judging whether the phase shift difference satisfies a preset range and determining the degree of glue overflow of the inspected part includes: determining multiple differences between each phase shift value of multiple detection points in the detection phase shift information and the corresponding reference detection value in the reference phase shift information, and determining the glue overflow level based on the multiple differences.

[0010] In some embodiments of the present application, multiple differences between each phase shift value of multiple detection points in the detection phase shift information and the corresponding reference detection value in the reference phase shift information are determined, and the glue overflow level is determined based on the multiple differences. Including: when the fluctuation range of the multiple differences is within the first preset fluctuation range, it is determined to be a slight glue overflow. When the fluctuation range of the multiple differences is within the second preset fluctuation range, it is determined to be a moderate glue overflow. When the fluctuation range of the multiple differences is within the third preset fluctuation range, it is determined to be a heavy glue overflow. Among them, the first preset fluctuation range is smaller than the second preset fluctuation range, and the second preset fluctuation range is smaller than the third preset fluctuation range.

[0011] In some embodiments of the present application, a camera mechanism is further included, which is configured to perform a first glue overflow detection on the inspection area to generate a detection image. The control device is also configured to determine whether there is a glue overflow area in the detection image based on the detection image. When there is no glue overflow, the moving mechanism is controlled to drive the laser detection mechanism and the carrying mechanism to move relative to each other, so that the laser emitter performs laser marking on multiple detection points of the inspection area of ​​the inspection object to be inspected, so as to perform a second glue overflow detection.

[0012] In some embodiments of the present application, the control device is also configured to determine whether there is a glue overflow area in the detection image based on the detection image, including determining whether there is glue overflow by comparing the color changes of the corresponding areas in the detection image and the reference image. When there is no glue overflow, the control device controls the moving mechanism to drive the laser detection mechanism and the carrying mechanism to move relative to each other, and performs a second glue overflow detection on the inspected part. Among them, the inspected part is a display screen, and there is a marker in the display screen, and the area corresponding to the marker has glue. The control device is also configured to control the moving mechanism to drive the laser detection mechanism to dot along a dot-dot path, and the dot-dot path is consistent with the contour line shape of the marker.

[0013] In some embodiments of the present application, the dot-marking path includes a first laser path and a second laser path. The first laser path and the second laser path extend in the same direction. The spacing d between the first laser path and the marker is 0.35 mm to 0.4 mm. In some embodiments of the present application, the emission time of the laser emitter at each detection point is 1 s to 2 s.

[0014] In some embodiments of the present application, the radius of each detection point is 0.10 mm to 0.20 mm; and / or, the distance D between two adjacent detection points in the plurality of detection points is 0.30 mm to 0.40 mm.

[0015] The embodiment of the present application also provides a method for detecting glue overflow, comprising emitting laser light to a plurality of detection points in a to-be-tested area of ​​a to-be-tested object, detecting the laser light reflected back from the plurality of detection points of the to-be-tested object, generating detection phase shift information according to the reflected laser light, determining whether the detection phase shift information satisfies a preset condition with reference phase shift information, and determining that glue overflow occurs in the to-be-tested object when the preset condition is met.

[0016] Compared with the prior art, the present application provides a method for detecting glue overflow, which first emits laser to multiple detection points in the inspection area of ​​the inspected part, detects the laser reflected back by the multiple detection points of the inspected part, generates detection phase shift information, and determines whether the detection phase shift information meets the preset conditions with the reference phase shift information. This solves the problem that the current detection of glue overflow on the display screen requires destructive disassembly, and provides a guarantee for the structural stability and functional integrity of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a glue overflow detection device provided in this application.

[0018] Figure 2 yes Figure 1 A partial enlarged view of the glue overflow detection device.

[0019] Figure 3 yes Figure 2 An enlarged view of the support mechanism in FIG.

[0020] Figure 4 yes Figure 2 Bottom view of the support mechanism in the unlocked state.

[0021] Figure 5 yes Figure 2 Bottom view of the locked state of the supporting mechanism in .

[0022] Figure 6 yes Figure 2 Exploded view of the moving mechanism in .

[0023] Figure 7 yes Figure 2 Exploded view of the glue overflow detection device.

[0024] Figure 8 It is a schematic diagram of the area to be inspected of the display screen.

[0025] Fig. 9 It is a comparison chart of phase shift data before and after the display screen overflows.

[0026] Fig.10 This is a phase shift diagram of a display screen with slight glue overflow.

[0027] Fig.11 This is the phase shift diagram of moderate glue overflow on the display.

[0028] Fig.12 This is a phase shift diagram of a display screen with severe glue overflow.

[0029] Fig.13 This is a flow chart of a glue overflow detection method provided by this application.

[0030] Description of main component symbols: Glue overflow detection device 100; inspected object 10; supporting mechanism 20; moving mechanism 30; camera mechanism 40; laser detection mechanism 50; control device 60; laser emitter 501; laser detector 502; supporting plate 21; clamping mechanism 22; first positioning member 222; second positioning member 223; first clamping assembly 220; first clamping part 2202; handle 2203; first transmission rod 2204; second clamping assembly 221; second clamping part 2212; second transmission rod 2213; transmission member 23; third end 2203a; fourth end 2203b; first hinged part 2203c; first conveying member 301; second conveying member 302; marker 101; gap 102; detection point 103; inspected area 110.

[0031] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally disposed component. When a component is considered to be "disposed on" another component, it may be directly disposed on the other component or there may be a centrally disposed component.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0035] See also Figure 1 and Figure 2 The embodiment of the present application provides a glue overflow detection device 100 for detecting whether glue overflow occurs on a test piece 10. The glue overflow detection device 100 includes a carrying mechanism 20, a laser detection mechanism 50, a moving mechanism 30, and a control device 60. The carrying mechanism 20 is configured to place the test piece 10. The test piece 10 may be a display screen.

[0036] See also Figure 3 In some embodiments, the bearing mechanism 20 includes a bearing plate 21 and a clamping mechanism 22 for fixing the display screen, and the clamping mechanism 22 includes a sliding plate, a first positioning member 222, and a second positioning member 223. The sliding plate is slidably connected to the moving mechanism 30. The first positioning member 222 is disposed on the sliding plate and is used to position the test piece 10 in the first direction X. The second positioning member 223 is disposed on the sliding plate and is used to position the test piece 10 in the second direction Y, and the first direction X is perpendicular to the second direction Y.

[0037] The clamping mechanism 22 may further include a first clamping assembly 220, a second clamping assembly 221 and a transmission member 23. The first clamping assembly 220 includes a first clamping portion 2202, a handle 2203 and a first transmission rod 2204. The first clamping portion 2202 is movably arranged on the sliding plate relative to the first positioning member 222. One end of the first transmission rod 2204 is passed through the first clamping portion 2202 and is hinged to the handle 2203. When the handle 2203 rotates around the first hinge portion 2203c, the first transmission rod 2204 drives the first clamping portion 2202 to move toward and away from the first positioning member 222 to lock and unlock the object to be inspected 10. The second clamping assembly 221 includes a second clamping portion 2212 and a second transmission rod 2213. The second clamping portion 2212 is movably arranged on the sliding plate relative to the second positioning member 223. The second transmission rod 2213 is passed through the second clamping portion 2212. The transmission member 23 is hinged on the sliding plate and respectively connects the first clamping assembly 220 and the second clamping assembly 221. When the first clamping assembly 220 moves toward and away from the first positioning member 222, the second clamping assembly 221 is driven by the transmission member 23 to move toward and away from the second positioning member 223.

[0038] See also Figure 4 and Figure 5 The handle 2203 includes a third end 2203a and a fourth end 2203b. The distance between the third end 2203a and the first hinge portion 2203c is smaller than the distance between the fourth end 2203b and the first hinge portion 2203c, so that when the handle 2203 rotates clockwise around the first hinge portion 2203c to the third end 2203a, the first transmission rod 2204 is driven to move in a direction close to the first positioning member 222. When the handle 2203 rotates counterclockwise around the first hinge portion 2203c to the fourth end 2203b, the first transmission rod 2204 is driven to move in a direction away from the first positioning member 222.

[0039] See also Figure 6 , the moving mechanism 30 is connected to at least one of the carrying mechanism 20 and the laser detection mechanism 50, and the moving mechanism 30 is configured to drive at least one of the carrying mechanism 20 and the laser detection mechanism 50 to move, so that the carrying mechanism 20 and the laser detection mechanism 50 move relative to each other. Through the moving mechanism 30, the fully automatic scanning of the inspected object 10 can be achieved, the need for manual operation is reduced, the labor cost is reduced, and the uniformity and stability of the detection are improved. In some embodiments, the moving mechanism 30 includes a first conveying member 301 and a second conveying member 302. The carrying member is slidably connected to the first conveying member 301, and the first conveying member 301 is arranged along the first direction X. The second conveying member 302 is slidably connected to the first conveying member 301, and the second conveying member 302 is arranged along the second direction Y and is used to move the first conveying member 301.

[0040] See also Figure 7 The laser detection mechanism 50 includes a laser emitter 501 and a laser detector 502. Please refer to Figure 8 , the laser emitter 501 is configured to emit laser to the detection point 103 in the inspection area 110 of the inspected piece 10. The laser emitter 501 can be a laser dotting device, which uniformly dots the detection points 103 in the inspection area 110 to make the inspection area 110 show a temperature rise. Laser technology can objectively and accurately capture the slight changes on the surface of the inspected piece 10, especially the slight deformation or temperature changes related to the overflow of glue. This can improve the accuracy of the overflow detection and reduce the cases of missed detection and misjudgment. Under the action of laser dotting, the laser detector 502 is configured to detect the laser reflected back from the detection point 103 of the inspected piece 10. The changes on the surface of the inspection area 110 are detected by the laser detector 502 to detect the fluctuation of the detection data.

[0041] Please refer to Figure 1 , the control device 60 is electrically connected to the moving mechanism 30 and the laser detection mechanism 50. The control device 60 is configured to control the moving mechanism 30 to drive the laser detection mechanism 50 and the supporting mechanism 20 to move relative to each other, so that the laser emitter 501 performs laser marking on multiple detection points 103 of the inspection area 110 of the inspection piece 10, so that the laser detection mechanism 50 generates detection phase shift information. Among them, the thermal signal reflected by the medium at the detection point 103 is converted into a stable phase shift value. When the medium changes (such as when glue overflow occurs), the phase shift value will be different. The phase shift value formed by multiple detection points 103 is the above-mentioned detection phase shift information. Therefore, the above-mentioned detection phase shift information can indirectly reflect the glue overflow condition inside the inspection piece 10. In some embodiments, it is set as follows Figure 8 The multiple detection points a1, b1, c1, d1, e1, f1, g1; a2, b2, c2, d2, e2, f2 and g2 shown are respectively laser detected at the detection points 103 in turn, and the detection phase shift values ​​are generated. Please refer to 9. In one example, when the medium has not changed (i.e. before the glue overflow), the detection phase shift values ​​generated by different detection points 103 are above 2.36°, and the difference between the detection phase shift values ​​of the multiple detection points 103 and the phase shift values ​​in the reference phase shift information is small, and the fluctuation is relatively small. When the medium changes (i.e. after the glue overflow), the detection phase shift values ​​generated by different detection points 103 are greatly reduced and are all below 2.33°. The difference between the detection phase shift values ​​of the multiple detection points 103 and the phase shift values ​​in the reference phase shift information is large, and the fluctuation is relatively large. Therefore, by comparing the difference before and after the glue overflow, it can be determined whether there is glue overflow in the test piece 10.

[0042] The control device 60 is also configured to determine whether the detected phase shift information and the reference phase shift information meet a preset condition based on the detected phase shift information, and if so, determine that glue overflow occurs in the test piece 10. The reference phase shift information is the phase shift information of the test piece 10 without glue overflow, and the reference phase shift information can be obtained by laser detection of the test piece 10 without glue overflow. The control device 60 compares the phase shift information according to the preset conditions to determine whether there is glue overflow, which enables the glue overflow detection device 100 to show high consistency and reliability in different production environments or material conditions.

[0043] Compared with the prior art, the present application sets a laser detection mechanism 50, emits laser to the inspection area 110 of the inspection object 10 through a laser emitter 501, and the laser detector 502 detects the laser emitted back from the detection point 103, and drives the bearing mechanism 20 to move relative to the laser detection mechanism 50 through the moving mechanism 30, so that the laser detection mechanism 50 generates detection phase shift information. By determining whether the detection phase shift information meets the reference phase shift information, it is determined whether there is glue overflow. Therefore, the present application does not need to use destructive testing to inspect the glue overflow of the inspection object 10, which provides protection for the structural stability and functional integrity of the product, effectively promotes the optimization and improvement of the structural process, and avoids corrosion of the touch circuit area due to glue overflow problems, causing adverse functional effects. The thermal signal reflected by the medium at the detection point 103 is converted into a stable phase shift value. When the medium changes, the phase shift value differs, which indirectly reflects the glue overflow inside the product. It not only does not damage the product, but also does not cause product defects, and has a low technical threshold, a short development cycle, and saves resource costs and time costs.

[0044] In some embodiments, the inspection object 10 is taken as a display screen for example. Figure 8As shown, when the inspected part 10 is a display screen, there is a marker 101 in the display screen, and the area corresponding to the marker 101 has glue. The marker 101 can be a connecting structure, that is, when the inspected part 10 is a display screen, the marker 101 serves as a connector between the display screen and the rear shell. In some embodiments, the marker 101 is foam. In some embodiments, after the display screen and the rear shell are glued and assembled, there is a gap 102 between the rear shell and the front panel screen. The glue overflows into this area to corrode the circuit of the front panel screen. It is necessary to ensure that there is no overflow of glue in this area to infiltrate and corrode the circuit. Since this detection position is inside the product, it is surrounded by the front panel screen and the rear shell, and cannot be visually inspected; previously, it could only be inspected by disassembling the product for visual observation, which is destructive and cannot meet the requirements of full inspection of mass production. In some embodiments, a laser detection mechanism 50 can be set to dot along a dot-dot path, and the dot-dot path is roughly consistent with the contour shape of the marker 101. Among them, the dot-dot path is the arrangement path of multiple detection points 103. By setting the dot-marking path, the area range of dot-marking detection can be saved. Because the marker can be a structure such as foam with glue, which is the main area where glue overflow may occur. Therefore, when performing laser dot detection, the detection is mainly carried out along the dot-marking area to achieve rapid glue overflow detection in the area where glue overflow may occur.

[0045] In one embodiment of the present application, determining whether the detected phase shift information and the reference phase shift information satisfy a preset condition, and determining that glue overflow occurs in the test piece 10 when the preset condition is satisfied, comprises the following steps: S100: Determine a phase shift difference between detected phase shift information and reference phase shift information.

[0046] The phase shift difference is the difference between the phase shift values ​​of the detection phase shift information and the reference phase shift information. The detection phase shift information is the phase shift information obtained by emitting laser to the inspection area 110 through the laser detection mechanism 50 and receiving the reflected phase shift information through the laser detector 502, and the reference phase shift information is the phase shift information obtained by performing laser detection on the inspection object 10 without glue overflow in a similar way. The detection phase shift information includes the phase shift values ​​of multiple detection points 103, and the reference phase shift information includes the reference phase shift values ​​of multiple detection points 103.

[0047] When calculating the difference between the phase shift value of the detection phase shift information and the reference phase shift information, the difference between the phase shift value corresponding to each inspection point 103 and the reference phase shift value can be specifically calculated, and the difference corresponding to multiple inspection points 103 is the phase shift difference between the detection phase shift information and the reference phase shift information. The higher the phase shift difference, the greater the degree of glue overflow.

[0048] S200: Determine whether the phase shift difference satisfies a preset range, and determine the degree of glue overflow of the inspected part.

[0049] In some embodiments, the preset range may be one or more. In some embodiments, when there is one preset range, the preset range refers to the phase shift value range where glue overflow occurs.

[0050] In some embodiments, if the phase shift difference meets the preset conditions, the result is recorded and marked as unqualified (NG). At the same time, the subsequent processing flow can be triggered, such as marking unqualified, conducting further inspections, or directly alarming. The entire detection process can achieve efficient and accurate overflow detection. This not only improves the quality control level in the production process, but also provides reliable data support for subsequent production and inspection processes. By systematically judging the status of the test piece 10, it is helpful to timely discover and deal with potential quality problems, thereby reducing the defective rate and improving the market competitiveness of the product.

[0051] See also Fig. 9 , by setting a plurality of detection points 103, and sequentially performing laser dot detection on the plurality of detection points 103 before and after the glue overflow, the reference phase shift information is obtained. Among them, point 1 to point 10 are a plurality of detection points before the glue overflow, and point 11 to point 20 are a plurality of detection points after the glue overflow; point 1 to point 10 correspond one to one with point 11 to point 20. According to the comparison of the data, it can be seen that the phase shift difference before and after the glue overflow is large. For example, the phase shift difference between point 1 and point 11 in path 1-1 before and after the glue overflow is 4.50°, and the degree of glue overflow between the two is large. The phase shift difference can be calculated to determine whether there is a serious glue overflow; accordingly, slight and moderate glue overflow can also be determined later.

[0052] In another embodiment, the preset range can be multiple. When there are multiple preset ranges, the multiple preset ranges refer to phase shift value ranges corresponding to different degrees of glue overflow. At this time, S200 determines the preset range satisfied by the phase shift difference and determines the degree of glue overflow of the test piece, specifically including: determining multiple differences between each phase shift value of multiple detection points in the detection phase shift information and the corresponding reference detection value in the reference phase shift information, and determining the glue overflow level based on the multiple differences.

[0053] The glue overflow level can be determined based on the multiple differences between each phase shift value of multiple detection points of the detection phase shift information and the corresponding reference detection value in the reference phase shift information. For example, the phase shift values ​​of the detection points a1, b1, c1, d1, e1, f1, g1, a2, b2, c2, d2, e2, f2 and g2 corresponding to each other before and after detection, and then the difference between the phase shift of each detection point and the corresponding phase shift in the reference phase shift information is compared. When glue overflow occurs, the phase shift difference of at least one of the detection points fluctuates. The greater the degree of glue overflow, the greater the range of fluctuation. It should be noted that when the fluctuation range of the corresponding multiple phase shift values ​​in the reference phase shift information is small, the average value thereof can be taken as the reference phase shift value, that is, the multiple differences between the phase shift values ​​of the detection points of the detection phase shift information and the corresponding phase shift values ​​in the reference phase shift information can be the difference between the phase shift values ​​of the multiple detection points of the phase shift information and the reference phase shift value.

[0054] In some embodiments, multiple differences between each phase shift value of multiple detection points in the detection phase shift information and the corresponding reference detection value in the reference phase shift information are determined, and the glue overflow level is determined based on the multiple differences, including: when the fluctuation range of the multiple differences is within the first preset fluctuation range, it is determined to be slight glue overflow. The fluctuation range refers to the curve change between each difference point. When the test piece 10 has slight glue overflow, it may be that some of the multiple differences have slight fluctuations, for example, the fluctuation range of the multiple differences is less than or equal to 1°. Please refer to Fig.10 The phase shift differences between the detection phase shift information obtained from multiple detection points fluctuate around 1°. Due to the influence of thermal effects, there may be very few points with phase shift values ​​as high as 2.10° for point c1 and 4.90° for point g2. These very few abnormal points can be eliminated and not analyzed.

[0055] When the fluctuation range of the multiple differences is within the second preset fluctuation range, it is determined to be moderate glue overflow. When the test piece 10 has moderate glue overflow, it is possible that most of the multiple differences have moderate fluctuations, for example, the fluctuation range of the multiple differences is greater than 1° and less than or equal to 3°. Fig.11 , the phase shift values ​​of the detection phase shift information obtained at multiple detection points fluctuate around 1.50°.

[0056] When the fluctuation range of the multiple differences is within the third preset fluctuation range, it is determined to be severe glue overflow; wherein, when the inspected piece 10 has severe glue overflow, it may be that each of the multiple differences has a large degree of fluctuation, for example, the fluctuation range of the multiple differences is greater than 3°. Fig.12, the phase shift value of the front and rear phase shift difference between the detection phase shift information obtained at multiple detection points fluctuates around 3.90°. By dividing the reference phase shift difference into multiple preset ranges, the condition of the test piece 10 can be evaluated more precisely. This hierarchical detection helps to more accurately identify different degrees of overflow, making the detection results more reliable. The systematic hierarchical detection method enriches the data background and facilitates statistical analysis and trend judgment.

[0057] Among them, the first preset fluctuation range is smaller than the second preset fluctuation range, and the second preset fluctuation range is smaller than the third preset fluctuation range.

[0058] It should be noted that the reference phase shift information can be determined by using the material before glue dispensing as the reference material and performing dot analysis on the corresponding detection points. The first preset fluctuation range is less than or equal to 1°, and the slight glue overflow is usually located at the connection between the marker 101 below the casing and the display screen. The glue overflow does not contact the casing, so only a few points of the actual casing are in contact with the glue overflow.

[0059] See also Fig.11 In one embodiment of the present application, the second preset fluctuation range is greater than 1° and less than or equal to 3°. Moderate glue overflow is usually located on the back of the housing, and the thickness of the glue overflow is lower than the thickness of the marker 101, that is, the fluctuation range of the phase shift value of the test piece 10 is large, and there is an intersection with the range of the phase shift value of the reference phase shift information (that is, the phase shift value range without glue overflow), wherein the existence of a range intersection means that there is a numerical overlap between the phase shift difference of the second preset fluctuation range and the phase shift value range without glue overflow.

[0060] See also Fig.12 In one embodiment of the present application, the third preset fluctuation range is greater than 3°. Severe glue overflow usually occurs on the back of the housing, and the thickness of the glue overflow is substantially equivalent to the thickness of the marker 101. That is, the detected phase shift value of the test piece 10 is 3°-5° lower than the phase shift value of the reference phase shift information, and the difference is obvious, which can be clearly distinguished from no glue overflow.

[0061] Therefore, the default fluctuation range corresponding to different levels of glue overflow can be determined based on the degree of glue overflow of different thicknesses, and different glue overflow thicknesses can be set to correspond to different degrees of glue overflow. For example, the first preset fluctuation range is determined according to the first glue overflow thickness (the thickness can be less than 1 / 4 of the thickness of the marker 101); the second preset fluctuation range is determined according to the second glue overflow thickness (the thickness can be 2 / 4 to 3 / 4 of the thickness of the marker 101); the third preset fluctuation range is determined according to the third glue overflow thickness (the thickness can be between 3 / 4 and 1 of the thickness of the marker 101).

[0062] See also Figure 1 and Figure 2In one embodiment of the present application, the overflow glue detection device 100 further includes a camera mechanism 40, which is configured to perform a first overflow glue detection on the inspected piece 10 to generate a detection image. The control device 60 is also configured to determine whether there is an overflow glue area in the detection image according to the detection image. When there is no overflow glue, the control moving mechanism 30 drives the laser detection mechanism 50 and the carrying mechanism 20 to move relative to each other, so that the laser emitter 501 performs laser dotting on multiple detection points 103 of the inspected area 110 of the inspected piece 10 to perform a second overflow glue detection. By setting the camera mechanism 40, it is possible to directly detect whether there is visually visible overflow glue on the display screen, thereby removing visible overflow glue products. Further, when there is no overflow glue, the control device 60 can move at least one of the carrying mechanism 20 or the laser detection mechanism 50 to accurately identify the inspected area based on visual guidance, and evenly dot the detection in the inspection area. In some embodiments, the camera mechanism 40 may include a charge coupled device (CCD). The inspection object 10 is scanned by the camera mechanism 40 under the movement of the moving mechanism 30 .

[0063] In some embodiments, the camera mechanism 40 can determine whether there is glue overflow by comparing the color changes of the corresponding areas in the detection image and the reference image. When there is no glue overflow, the control device 60 controls the moving mechanism 30 to drive the laser detection mechanism 50 and the supporting mechanism 20 to move relative to each other, and performs a second glue overflow detection on the inspected object 10.

[0064] See also Figure 8 In one embodiment of the present application, the dot-marking path of the laser detection mechanism 50 includes a first laser path and a second laser path. The first laser path and the second laser path extend in the same direction. The spacing d between the first laser path and the marker 101 is 0.35 mm to 0.4 mm. By setting two laser paths with the same extension direction, the situation where the laser dots are mistakenly marked on the marker 101 can be effectively improved, thereby increasing the credibility of the detected phase shift information. By setting the spacing d between the first laser path and the marker 101 to 0.35 mm to 0.4 mm, the situation where the laser dots are mistakenly marked on the marker 101 can be improved. In some embodiments, please refer to Figure 8 , the first laser path can be a1, b1, c1, d1, e1, f1 and g1, and the second laser path can be a2, b2, c2, d2, e2, f2 and g2. Please also refer to Fig.10 , Fig.11 and Fig.12When there is slight glue overflow, the difference between the phase shift of multiple detection points 103 and the phase shift value in the reference phase shift information is very small, less than or equal to 1°, and only c1 and g2 have the problem of excessive phase shift difference (interference can be eliminated). When there is moderate glue overflow, the phase shift difference of each detection point 103 is in a fluctuating state, and the difference between the phase shift of each detection point 103 and the phase shift value in the reference phase shift information is greater than 1° and less than or equal to 3°. When there is severe glue overflow, the difference between the phase shift of each detection point 103 and the phase shift value in the reference phase shift information is greater than 3°.

[0065] In one embodiment of the present application, the emission time of the laser emitter 501 at each detection point 103 is 1 s to 2 s. With a shorter emission time, the laser can be prevented from penetrating the rear cover of the display screen while obtaining a phase shift.

[0066] In one embodiment of the present application, the radius of each detection point 103 is 0.10 mm to 0.20 mm. By setting the radius of each detection point to 0.1 mm to 0.20 mm, it is possible to prevent the radius from being too large and causing damage to the back cover of the display screen. And / or, the spacing between two adjacent detection points is 0.30 mm to 0.40 mm, the laser points will not overlap, and the maximum fluctuation of the phase shift between the detection points is kept within 0.5°, ensuring that it can cover and distinguish different degrees of overflow glue.

[0067] See also Fig.13 The present application also provides a method for detecting glue overflow, comprising the following steps: Step S1 , emitting laser light to a plurality of inspection points 103 in the inspection area 110 of the inspection object 10 .

[0068] In some embodiments, the camera mechanism 40 can be used to identify whether glue overflow occurs on the surface of the inspection area 110 of the inspection piece 10. If glue overflow occurs, the inspection piece 10 is removed for subsequent steps. By first identifying glue overflow in the inspection area 110 of the inspection piece 10, the visually visible glue overflow products are directly removed without the need for the next step of laser dotting, which can reduce the cost of laser inspection.

[0069] Step S2 : detecting the laser light reflected from the plurality of detection points 103 of the object to be inspected 10 .

[0070] Step S3, generating detection phase shift information according to the reflected laser, determining whether the detection phase shift information and the reference phase shift information meet a preset condition, and determining that glue overflow occurs in the inspected object 10 when the preset condition is met.

[0071] The method for detecting glue overflow provided in the embodiment of the present application determines whether glue overflow occurs by determining that the detection phase shift information satisfies the preset conditions with the reference phase shift information, and determining that glue overflow occurs on the test piece 10 when the preset conditions are met. Therefore, the present application does not need to use destructive testing to inspect the glue overflow of the test piece 10, which provides guarantees for the structural stability and functional integrity of the product, effectively promotes structural process optimization and improvement, and avoids corrosion of the touch circuit area due to glue overflow problems, causing adverse functional effects. The thermal signal reflected by the medium at the detection point 103 is converted into a stable phase shift value. When the medium changes, the phase shift value differs, which indirectly reflects the glue overflow condition inside the product. It not only does not damage the product and does not cause product defects, but also has a low technical threshold and a short development cycle, saving resource costs and time costs.

[0072] The above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and essence of the technical solution of the present application.

Claims

1. A glue overflow detection device, used to detect glue overflow, characterized in that: The glue overflow detection device comprises: A carrying mechanism, configured to place the object to be inspected; A laser detection mechanism, the laser detection mechanism comprising a laser emitter and a laser detector, the laser emitter being configured to emit laser light to a plurality of detection points within the inspection area of ​​the inspection object, and the laser detector being configured to detect laser light reflected back from the plurality of detection points of the inspection object; a moving mechanism connected to at least one of the carrying mechanism and the laser detection mechanism, wherein the moving mechanism is configured to drive at least one of the carrying mechanism and the laser detection mechanism to make the carrying mechanism and the laser detection mechanism move relative to each other; and A control device is electrically connected to the moving mechanism and the laser detection mechanism. The control device is configured to control the moving mechanism to drive the laser detection mechanism and the supporting mechanism to move relative to each other, so that the laser emitter performs laser marking on the multiple detection points in the inspection area of ​​the inspected part to perform glue overflow detection, so that the laser detection mechanism generates detection phase shift information. The control device is also configured to determine whether a preset condition is met between the detection phase shift information and the reference phase shift information based on the detection phase shift information, and determine that glue overflow occurs on the inspected part when the preset condition is met.

2. The glue overflow detection device according to claim 1, characterized in that: The determining whether the detection phase shift information and the reference phase shift information satisfy a preset condition, and determining that glue overflow occurs on the inspected object when the preset condition is satisfied, comprises: determining a phase shift difference between the detected phase shift information and the reference phase shift information; It is determined whether the phase shift difference satisfies a preset range, and the degree of glue overflow of the inspected part is determined.

3. The glue overflow detection device according to claim 2, characterized in that: Determining whether the phase shift difference satisfies a preset range and determining the degree of glue overflow of the inspected part includes: A plurality of differences between each phase shift value of the plurality of detection points in the detection phase shift information and a corresponding reference detection value in the reference phase shift information are determined, and a glue overflow level is determined based on the plurality of differences.

4. The glue overflow detection device according to claim 3, characterized in that: The step of determining a plurality of differences between each phase shift value of the plurality of detection points in the detection phase shift information and a corresponding reference detection value in the reference phase shift information, and determining the glue overflow level based on the plurality of differences, comprises: When the fluctuation range of the plurality of differences is within the first preset fluctuation range, it is determined to be slight glue overflow; When the fluctuation range of the plurality of differences is within the second preset fluctuation range, it is determined to be moderate glue overflow; When the fluctuation range of the plurality of differences is within a third preset fluctuation range, it is determined to be severe glue overflow; Among them, the first preset fluctuation range is smaller than the second preset fluctuation range, and the second preset fluctuation range is smaller than the third preset fluctuation range.

5. The glue overflow detection device according to any one of claims 1 to 4, characterized in that: It also includes a camera mechanism configured to perform a first glue overflow detection on the surface of the area to be inspected to generate a detection image; The control device is also configured to determine whether there is a glue overflow area in the detection image based on the detection image. When no glue overflow occurs, the control device controls the moving mechanism to drive the laser detection mechanism and the supporting mechanism to move relative to each other, so that the laser emitter performs laser marking on multiple detection points in the inspection area of ​​the inspection piece to perform a second glue overflow detection.

6. The glue overflow detection device according to claim 5, characterized in that: The determining, according to the detection image, whether there is a glue overflow area in the detection image includes: By comparing the color changes of the corresponding areas in the detection image and the reference image, determining whether there is glue overflow on the surface of the area to be inspected; When there is no glue overflow on the surface of the area to be inspected, the control device controls the moving mechanism to drive the laser detection mechanism and the supporting mechanism to move relative to each other, and performs a second glue overflow detection on the part to be inspected; wherein, the part to be inspected is a display screen, and there is a marker in the display screen, and the area corresponding to the marker has glue, and the control device is also configured to control the moving mechanism to drive the laser detection mechanism to dot along a dot-marking path, and the dot-marking path is consistent with the contour line shape of the marker.

7. The glue overflow detection device according to claim 6, characterized in that: The dot-marking path includes a first laser path and a second laser path, the first laser path and the second laser path extend in the same direction, and a distance d between the first laser path and the marker is 0.35 mm to 0.4 mm.

8. The glue overflow detection device according to any one of claims 1 to 4, characterized in that: The emission time of the laser emitter at each detection point is 1s to 2s.

9. The glue overflow detection device according to any one of claims 1 to 4, characterized in that: The radius of each of the detection points is 0.10 mm to 0.20 mm; and / or the distance D between two adjacent detection points is 0.30 mm to 0.40 mm.

10. A method for detecting glue overflow, characterized in that: include: emitting laser light to a plurality of inspection points in the inspection area of ​​the inspection object; Detecting laser light reflected from the plurality of detection points of the object to be inspected; as well as Detection phase shift information is generated according to the reflected laser, and it is determined whether the detection phase shift information satisfies a preset condition with reference phase shift information, and when the preset condition is met, it is determined that glue overflow occurs on the inspected piece.

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