CN113447487A - Screen damage detection method, screen damage detection system and screen printing equipment - Google Patents
Screen damage detection method, screen damage detection system and screen printing equipment Download PDFInfo
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- CN113447487A CN113447487A CN202110579286.3A CN202110579286A CN113447487A CN 113447487 A CN113447487 A CN 113447487A CN 202110579286 A CN202110579286 A CN 202110579286A CN 113447487 A CN113447487 A CN 113447487A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
Abstract
The invention relates to the technical field of photovoltaic screen printing, and provides a screen damage detection method, a screen damage detection system and screen printing equipment. The screen damage detection method comprises the following steps: acquiring an image, namely acquiring the image of the screen to obtain a screen image; processing the image, namely processing the information of the screen image to acquire the gray value of the screen image; judging the damage condition, namely judging the damage condition of the screen according to the gray value of the screen image; wherein, the damage condition of the screen plate comprises cracking and cracks. The invention can find the damage of the screen printing plate in time, is convenient for workers to replace in time, and effectively avoids the problem that a plurality of table tops need to be cleaned because the damage can not be found in time, thereby effectively saving the time for cleaning the table tops and simultaneously improving the operation efficiency of equipment and the qualification rate of products.
Description
Technical Field
The invention relates to the technical field of photovoltaic screen printing, in particular to a screen damage detection method, a screen damage detection system and screen printing equipment.
Background
At present, various photovoltaic manufacturers mostly adopt a screen printing method to prepare electrodes and electric fields for the battery pieces. The screen printing method involves a screen replacement process, which is indispensable in the screen printing process and can be optimized only for the purpose of reducing the time consumption for replacing the screen. The traditional replacement method is that the battery piece is rotated to a printing station through a mechanism, when the battery piece stops at the printing station, the scraper scrapes and prints the slurry on the battery piece through the graph on the screen, and the phenomenon that the screen is damaged in the scraping process (the service life of the screen is up, the battery piece is hidden and cracked, foreign matters are in the slurry, clamping points are arranged on the surface of the battery piece and the like can cause the screen to be scraped and cracked) can occur. After the half tone destroys among the prior art, if can not in time shut down, thick liquids can drop a plurality of mesas, perhaps can not appear damaged common condition to the half tone and detect comprehensively, lead to detecting not in place, can not in time discover the damaged condition of half tone, consequently, cause the cleaning time overlength, influence equipment operating efficiency, reduce the qualification rate of treating the (silicon chip) of machined part.
In addition, the method for detecting the workpieces in the assembly line commonly used in the prior art is not suitable for detecting the damage condition of the screen plate in the screen printing equipment, mainly because the method is limited by the characteristics of printing, the screen printing is one of stencil printing, the screen plate is used as an intermediate carrier, the slurry borne on the surface of the screen plate is printed on a battery plate below the screen plate through printing holes on the screen plate, the detection of the printing screen plate is based on the detection of the battery plate and the slurry, the method is not only the detection of the screen plate, but also in the prior art, the detection of the workpieces in the assembly line is based on the detection of the workpieces, the appearance of the processed workpieces is detected one by one, and whether the surface defects exist is detected. Therefore, it is not suitable for screen inspection in a screen printing apparatus.
The problems are that a whole set of screen plate detection mode about the screen printing equipment is urgently needed, slurry is prevented from being scraped on a plurality of table tops due to the fact that damage of the screen plates is not found in time, and the situation that cleaning is time-consuming and long is avoided.
Disclosure of Invention
In order to solve the problems that the damage of the screen printing plate cannot be found in time and the cleaning time is very long due to the fact that slurry is easily scraped on a plurality of table tops in the prior art, the invention aims to provide a screen printing plate damage detection method.
Another object of the present invention is to provide a screen damage detection system.
It is still another object of the present invention to provide a screen printing apparatus.
In order to achieve the above object, an embodiment of the first aspect of the present invention provides a method for detecting a damage to a screen, including: acquiring an image, namely acquiring the image of the screen to obtain a screen image; processing the image, namely processing the information of the screen image to acquire the gray value of the screen image; judging the damage condition, namely judging the damage condition of the screen according to the gray value of the screen image; wherein, the damage condition of the screen plate comprises cracking and cracks.
In the method for detecting damage to a screen printing plate according to the above embodiment of the present invention, the image of the screen printing plate is collected and the collected image of the screen printing plate is processed, so that the gray value information of the image of the screen printing plate can be obtained, and whether the screen printing plate is damaged or not can be determined according to the gray value information. Like this, can in time discover when the half tone takes place the damage, the staff of being convenient for in time carries out the half tone and changes, effectively avoids because of can not in time discover and the problem that a plurality of mesa that lead to need the clearance, so can effectively save the consuming time of clearance mesa, can also promote equipment operating efficiency and promote the product percent of pass simultaneously.
In the above technical scheme, the screen printing plate is a screen printing plate after slurry printing.
In any of the above technical solutions, acquiring the image includes: illuminating the screen area through a light source; and shooting the image of the screen area through a camera.
In the scheme, the light source is used for assisting the camera to shoot, and the screen area and the background area can be distinguished by providing the appropriate light source, so that a high-quality image is obtained.
In any of the above technical solutions, processing the image includes: carrying out gray level processing on the information of the screen image through an image processing module to obtain a gray level value of a gray level image; and acquiring the number of pixels meeting the gray value setting range in the gray image through a pixel acquisition module.
In this embodiment, the number of pixels of an image is a product (X × Y) of the number of pixels included in the width and height directions of a bitmap image, that is, the number X of pixels included in the length direction of the image and the number Y of pixels included in the width direction of the image. Through the acquired number of pixels meeting the gray value setting range, whether the screen printing plate is damaged or not can be judged according to the number of the pixels, so that the comparison of the images can be converted into the comparison of the number, and the judgment mode is more direct and the result is more accurate.
In any of the above technical solutions, the determining that the screen plate is broken includes: selecting a first detection area, namely a complete detection area of a screen printing plate, wherein the number of pixels of the first detection area is m, and m is an integer greater than or equal to 1; acquiring a first pixel number, namely the number of pixels meeting a first gray value range; judging whether the image is cracked or not, namely comparing the number of the first pixels with the number of the first preset image pixels; when the number of the first pixels is more than or equal to the number of the first preset image pixels, judging that the screen printing plate is broken; when the number of the first pixels is smaller than the number of the first preset image pixels, judging that the screen printing plate is not broken; the first gray value range is greater than or equal to 0 and less than or equal to 40; when the screen is broken, the number of the first preset image pixels is the number of the image pixels at the broken position of the screen.
The broken screen refers to the broken screen with a large area, the processed image can see the lower processed piece from the broken part, the gray scale value range of the processed piece is different from that of the screen, the gray scale value range of the normal screen (the screen without the broken screen) is 80-140, and if the screen is broken, the gray scale value range of the broken part is only 5-35. Therefore, when judging whether the screen is cracked or not, the gray value of the processed part is taken as the judgment basis, the processed part is a silicon wafer, the normal gray value range of the silicon wafer is 5-35, and in order to avoid omission, the gray value can be properly adjusted, so that the range of 0-40 is selected as the gray value range of the silicon wafer, namely the first gray value range, the pixels at the cracked positions can be ensured to be counted, and the omission caused by errors is avoided.
The first number of pixels is an image shot when the equipment runs, after the image processing, the number of pixels which meet the gray value range of the silicon wafer in the selected detection area (complete detection area) is compared with the first preset number of pixels of the image, and then the conclusion whether the crack occurs can be obtained according to the compared number relation.
In any of the above technical solutions, determining the screen crack includes: selecting a first detection area, namely a complete detection area of a screen printing plate, wherein the number of pixels of the first detection area is m, and m is an integer greater than or equal to 1; or selecting a second detection area, namely a local detection area of the screen printing plate, wherein the edge of the second detection area is positioned at the edge of the screen printing plate and is arranged along the walking direction of the printing device, the number of pixels of the second detection area is n, and n is an integer greater than or equal to 1; acquiring a second pixel number, namely the number of pixels meeting a second gray value range; judging whether a crack exists or not, namely comparing the number of the second pixels with the number of the second preset image pixels; when the number of the second pixels is larger than or equal to the number of the second preset image pixels, judging that the screen printing plate has cracks; when the number of the second pixels is smaller than the number of the second preset image pixels, judging that the screen printing plate has no crack; the second gray scale value range is greater than or equal to 250 and less than or equal to 255; when the screen is cracked, the number of the second preset image pixels is the number of the image pixels at the crack of the screen.
The cracks refer to tiny cracks or tiny gaps on the screen, a certain amount of slurry falls on a workpiece below the cracks, and then the slurry is concentrated, namely the slurry can be observed from the cracks in a shot image, the gray value range of the slurry is different from the gray value range of the screen, therefore, when the screen is judged to have the cracks, the gray value range of the slurry is selected as a judgment basis, the shot effect of the slurry is white, the white gray value is 255, and the gray value range of the slurry is properly adjusted in order to reduce the interference of other factors, therefore, the gray value range of the slurry is determined to be 250-plus-255, namely the second gray value range, the pixels at the cracks can be ensured to be counted, the omission of the pixels due to errors is avoided, and the detection accuracy is improved.
The second preset image pixel number is the number of pixels meeting the above-mentioned slurry gray value range after the screen plate has cracks, and is an empirical value. And the second pixel number is an image shot when the equipment runs, the number of pixels meeting the slurry gray value range in the selected detection area (the complete detection area or the local detection area) after the image processing is carried out on the image, and the second pixel number is compared with the second preset image pixel number, so that the conclusion whether the crack occurs can be obtained according to the quantity relation of the comparison.
The damaged half tone appears in the half tone, needs in time to change the half tone, and under general condition, the reason that causes the damaged half tone mainly includes that half tone life has arrived, the battery piece appears hidden splitting, has foreign matter in the thick liquids, battery piece surface has the stuck point (for example, in the process before the battery piece printing technology, battery piece edge that produces appears the bump of scorching etc. before the coating film) or battery piece surface is detained foreign matter etc. can summarize into two kinds of situations:
firstly, the service life of the screen plate is reached, and secondly, the screen plate is influenced by external foreign matters; when either of the two conditions occurs, the operation of the screen printing plate can be influenced; accordingly, the method for detecting the screen cracking mainly aims at the damage condition generated when the screen reaches the service life, and the method for detecting the screen cracking mainly aims at the damage condition generated when the screen is scratched by the foreign matters.
In the scheme, the screen printing plate is broken and generally appears at the middle part of the screen printing plate, so that the detection is carried out in a complete detection area, namely the first detection area, in order to improve the detection accuracy.
The screen printing plate has cracks, generally appears along the operation direction of the scraper, and at the edge of the screen printing plate, in order to improve the accuracy, the local detection area is preferably detected, namely the second detection area, the range of the local detection area is small, the response of corresponding parts of the equipment is more sensitive, the operation speed is higher, the response time of the corresponding parts can be reduced, and the detection accuracy is improved; alternatively, the detection may be performed over the entire detection area.
After printing each time is accomplished, all carry out damage detection to the half tone, half tone breaks to detect promptly and half tone crack detects, specifically, first condition: the fracture detection may be performed first, followed by the crack detection. It can be understood that: when the screen is judged to be broken, the screen is broken, and the crack detection is not carried out any more, when the screen is judged not to be broken, the crack detection is carried out, if the screen is judged to be broken, the screen is broken, and if the screen is judged not to be broken, the screen is not broken; alternatively, the second case: and carrying out crack detection firstly and then carrying out fracture detection. It can be understood that: when judging that the half tone has the crack, the half tone has taken place the breakage, no longer breaks and detects, when judging that the half tone has not appeared the crack, breaks and detects, if judge that the half tone appears breaking, the half tone appears breakage, if judge that the half tone does not appear breaking, the half tone does not take place breakage.
Preferably, the second case is used because crack detection is performed in a local detection zone, and the response of the corresponding component is more sensitive, faster in operation, and less long in response time than full detection zone detection.
An embodiment of a second aspect of the present invention provides a screen damage detection system, which is used for a screen printing apparatus, and includes: the image acquisition device is used for acquiring image information of the screen area; the image processing module is used for receiving the image information acquired by the image acquisition device and processing the image information to obtain a processed image; the control unit is used for judging the damage condition of the screen plate according to the processed image; the breakage of the screen plate includes cracks and fissures.
In the system for detecting damage to the screen printing plate according to the above embodiment of the present invention, the image acquisition module is configured to acquire image information of the screen printing plate region, the image processing module is configured to process the acquired image information, and the control unit is further configured to determine whether the screen printing plate is damaged according to the processed image. Like this, can in time discover when the half tone takes place the damage, the staff of being convenient for in time carries out the half tone and changes, effectively avoids because of can not in time discover and the problem that a plurality of mesa that lead to need the clearance, so can effectively save the consuming time of clearance mesa, can also promote the qualification rate of equipment operating efficiency and product simultaneously.
An embodiment of a third aspect of the present invention provides a screen printing apparatus including: the screen printing plate is pre-stored with slurry on the surface; the conveying device is used for conveying the processed parts to the position below the screen printing plate; the printing device is used for printing the slurry on the screen printing plate on the workpiece; and a screen damage detection system according to any one of the second aspects above, for detecting a damage of the screen.
According to the screen printing equipment provided by the embodiment of the invention, through the screen damage detection system, whether the screen breaks or not can be detected in time in use. Therefore, the time consumption for replacing the screen printing plate can be reduced in the printing process, so that the productivity of the whole screen printing line is improved, and the operation efficiency of equipment and the qualification rate of products are greatly improved.
In any one of the above technical solutions, the image capturing apparatus includes: the camera is used for shooting images of the screen area; the light source is used for providing illumination for the screen area; and a bracket for adjusting and fixing the camera and the light source; the light source adopts a bright color light source, and the irradiation area of the light source covers the shooting area of the camera.
In the scheme, the light source has compatibility, and a bright light source is selected, so that color difference contrast is formed between the light source and the screen printing plate and between the light source and the slurry during shooting, and imaging contrast is facilitated. Preferably, it may be a white light source.
In any of the above technical solutions, the screen printing apparatus further includes: the visual positioning device is arranged at the front end of the conveying device and used for shooting a front-end workpiece on the conveying device; the camera and the light source are arranged on the visual positioning device through the bracket.
In the scheme, the visual positioning device can pick up the position of the machined part by shooting the front end machined part on the conveying device, and can send the position information of the machined part to the control system, so that the screen printing equipment can be accurately controlled. The front end processing piece refers to a processing piece which is not operated to the position below the screen plate at the same time.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a block diagram of a screen damage detection system according to an embodiment of the present invention;
fig. 2 is a block diagram of a control unit in the screen damage detection system according to an embodiment of the present invention;
fig. 3 is a partial schematic view of a screen printing apparatus according to an embodiment of the invention;
FIG. 4 is an enlarged, fragmentary schematic view of the stencil area of FIG. 3;
FIG. 5 is a schematic view of a stent structure according to an embodiment of the present invention;
FIG. 6 is another side schematic view of the structure of FIG. 5;
fig. 7 is an enlarged schematic view of a mount of a screen printing apparatus according to an embodiment of the invention;
fig. 8 is a plan view of a screen printing apparatus according to an embodiment of the invention;
FIG. 9 is a schematic view of a first detection zone of one embodiment of the present invention;
FIG. 10 is a schematic view of a second detection zone in accordance with one embodiment of the present invention;
fig. 11 is a schematic flow chart illustrating a method for detecting screen damage according to an embodiment of the present invention;
fig. 12 is a second schematic flowchart of a method for detecting screen damage according to an embodiment of the present invention;
fig. 13 is a third schematic flow chart of a method for detecting screen damage according to an embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 10 is:
the device comprises a 10 image acquisition device, a 20 image processing module, a 30 control unit, a 32 pixel acquisition module, a 34 pixel comparison module, a 36 result judgment module, a 100 screen printing plate, a 110 detection area, a 112 first detection area, a 114 second detection area, a 200 transportation device, a 300 printing device, a 310 knife group device, a 400 camera, a 500 light source, a 600 support, a 610 first support, a 612 first threaded hole, a 614 first kidney-shaped hole, a 620 second support, a 622 second threaded hole, a 630 third support, a 632 first adjusting hole, a 634 second adjusting hole, a 640 fourth support, a 642 fourth threaded hole, an 644 fourth kidney-shaped hole, a 700 visual positioning device and an 800 alignment adjustment device.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A screen damage detection method, a screen damage detection system, and a screen printing apparatus according to some embodiments of the present invention will be described below with reference to fig. 1 to 13.
As shown in fig. 1, an embodiment of the first aspect of the present invention provides a screen damage detection system for a screen printing apparatus, including: an image acquisition device 10, an image processing module 20 and a control unit 30. The image acquiring device 10 is configured to acquire image information of a screen area to obtain the image information. The image processing module 20 is configured to receive the image information obtained by the image capturing device 10, and process the obtained image information to obtain a processed image. Then, the control unit 30 can determine whether or not the screen 100 is damaged based on the obtained processed image.
In the screen damage detection system provided in the above embodiment of the present invention, the image of the screen area is collected and processed, and then is judged and analyzed. Whether the half tone takes place the damage can be judged out through intelligent mode to can in time remind personnel to carry out the half tone and change, be favorable to sparingly changing the time of half tone and clearance mesa, help improving production efficiency, and improve the qualification rate of treating the machined part.
In some embodiments, the processing performed by the image processing module 20 is a grayscale processing, and a grayscale image can be obtained through the grayscale processing. The obtained gray level image can still reflect the distribution and the characteristics of the whole and local chromaticity and brightness levels of the whole image. The control unit 30 then determines the damage of the screen 100 based on the obtained grayscale image, and can reduce the amount of calculation of subsequent images by performing the determination using the grayscale image. The gray image is a special color image in which three components (rgb) of color are the same, and the change range of the gray value is (0-255).
In certain embodiments, as shown in fig. 2 and 8, the control unit 30 includes a pixel acquisition module 32, a pixel comparison module 34, and a result determination module 36. The pixel obtaining module 32 is configured to obtain the number of pixels in the detection area 110 in the grayscale image, and the number of pixels in the detection area 110 whose grayscale value satisfies the grayscale setting range. The pixel comparison module 34 compares the number of pixels with a gray value satisfying a gray value setting range with a preset number of pixels of an image, specifically, compares the number of pixels with a numerical value. The result determining module 36 then determines whether the detection area 110 is damaged according to the comparison result of the pixel comparing module 34, so as to draw a conclusion whether the screen 100 is damaged.
In some embodiments, the detection area 110 is the first detection area 112, and specifically, the first detection area 112 is a screen area included in a range of a traveling path of the printing apparatus 300, that is, the entire range of the detection area 110, that is, the entire detection area can be understood as a complete detection area; the number of pixels in the first detection region 112 is set to m. The first detection region 112 is detected, so that the accuracy in detection can be improved.
In certain embodiments, the detection region 110 is a second detection region 114, and the second detection region 114 may be any portion within the detection region 110. Since cracks occur at the edge of the screen 100, the second detection region 114 is preferably located at the edge of the detection region 110 and along the traveling path of the printing apparatus 300. The detection area can be reduced by only detecting the edge area, and the detection precision and efficiency are improved. The number of pixels in the second detection region 114 is set to n, which is smaller than m. When the second detection area 114 is detected, since the second detection area 114 does not cover the whole detection area 110, when the second detection area 114 is detected, the response of corresponding parts of the device is more sensitive, the operation speed is higher, and the detection precision is improved.
In some embodiments, when the damage condition of the screen 100 is determined according to the comparison result of the pixel comparison module 34, when the number of pixels satisfying the gray scale setting range is greater than or equal to the number of pixels of the preset image, it is determined that the screen 100 is damaged. When the number of pixels satisfying the gray value setting range is smaller than the number of pixels of the preset image, it is determined that the screen 100 is not damaged. Specifically, the method comprises the following steps:
judgment when the screen 100 is broken:
(1) and setting statistical parameters and comparison parameters.
When the breakage is a break, the work piece located below the screen 100 can be seen from the break in the photographed image. Therefore, the range of the tone values of the workpiece can be set as the range of the tone values when the screen 100 is broken. Setting the gray value setting range to be a or less1I.e. the first gray value range, where a1Is the gray value range of the workpiece.
The workpiece is a silicon wafer, the gray value range of the silicon wafer is 5-35, in order to avoid missing pixel points caused by errors in detection, the gray value range of the silicon wafer is properly expanded, namely the gray value range a of the workpiece is1Can be set to 0. ltoreq. a1Less than or equal to 40. The judgment error caused by the omission of the memory can be effectively avoided.
And (3) counting parameters: according to the processed gray scaleImage counting the number c of the first pixels in the first grey value setting range1。
And (3) comparison parameters: i.e. the first predetermined number of picture pixels, set as b1(ii) a The first preset image pixel number is: when the number of the pixels in the first detection area is m, the number of the pixels meeting the first gray value setting range at the broken position is obtained through a large number of tests if the screen is broken.
(2) And selecting a detection area, and counting parameters based on the detection area.
When detecting the breakage of the screen 100, it is necessary to detect the entire detection area of the screen 100. As shown in fig. 9, the first detection area 112 is a complete detection area of the screen 100, the number of pixels in the first detection area 112 is m, and m is an integer greater than or equal to 1. In the detection, the grayscale image is the grayscale image of the entire range of the first detection region 112, and in the parameter statistics, the number of pixels in the grayscale image of the entire range of the first detection region 112 that corresponds to the grayscale setting range is counted.
(3) And judging the statistical parameters and the comparison parameters.
The number c of the first pixels conforming to the first gray value setting range1Comparing with the contrast parameter, and setting the contrast parameter at the moment as b1(ii) a When c is going to1≥b1If so, the screen plate 100 is judged to be defective, i.e., broken, and if c1＜b1If so, the screen plate 100 is judged to be qualified and is not broken.
In a specific embodiment, as shown in fig. 9, the number m of all pixels in the first detection area 112 is 56 ten thousand at this time. Wherein, the arrow direction is the printing direction of the knife group device, A is the initial end of the knife group device, and B is the finishing end of the knife group device. The pixel number m in the first detection area 112 is set to 56 ten thousand, and a lot of experiments show that when the pixel number in the first detection area is 56 ten thousand, if the screen 100 breaks, the broken portion has a pixel number which satisfies the first gray value setting range of about 5000, so that the screening condition for detecting the pixel number of the first preset image during the breaking is set to be greater than or equal to 5000, b1Under the screening conditions of greater thanEqual to 5000.
Judging when the screen 100 is cracked:
(1) and setting statistical parameters and comparison parameters.
When the failure condition is a crack, the slurry at the crack can be seen in the photographed image. The gray level value of the paste is larger than that of the screen 100, so that the gray level value setting range is set to be a or more2Where a is2Is the gray value range of the slurry, i.e., the second gray value range.
Since the effect of the slurry shot is white, and the gray value of the white is 255, in order to reduce the interference of other factors, the gray value range of the slurry is properly expanded, namely the gray value range a of the slurry2Can be set to 250. ltoreq. a2Is less than or equal to 255. Therefore, 250-. At this time, the gradation value setting range is set to be equal to or larger than the gradation value range a of the slurry2The method can count the pixels at the crack, effectively avoid omission and improve the detection accuracy.
And (3) counting parameters: according to the processed gray level image, counting the number c of pixels in accordance with the second gray level value setting range2。
And (3) comparison parameters: the second predetermined number of image pixels is set as b2(ii) a The second preset number of image pixels is: and when the number of the pixels in the first detection area is m, the number of the pixels meeting the second gray scale value setting range at the crack position if the screen plate cracks is obtained through a large number of tests.
(2) And selecting a detection area, and counting parameters based on the detection area.
When detecting the crack of the screen 100, the entire detection area of the screen 100, that is, the entire range of the first detection area 112 shown in fig. 9, may be detected.
(3) And judging the statistical parameters and the comparison parameters.
The number c of pixels meeting the second gray scale value setting range2Comparing with the contrast parameter, and setting the contrast parameter at the moment as b2. When c is going to2≥b2If so, the screen plate 100 is judged to be unqualified, indicating that the screen plate 100 has a crack, and if c is judged to be unqualified2＜b2If so, the screen plate 100 is judged to be qualified and no crack is generated.
In one embodiment, the number of pixels in the first detection region 112 is set to 56 ten thousand, and the screening condition for the number of pixels in the preset image is greater than or equal to 3000, i.e. b2The screening condition of (3) is 3000 or more. A large number of experiments show that when the number of pixels in the first detection area is 56 ten thousand, if the screen 100 has a crack, the number of pixels in the crack satisfying the second gray scale value setting range is about 3000, so that the screening condition of the second preset image pixel number when the crack is detected is set to be greater than or equal to 3000, b2The screening condition of (3) is 3000 or more.
In a specific embodiment, as shown in fig. 10, when detecting a crack in the screen 100, a local region of the screen 100, that is, the second detection region 114 is detected. The second detection area 114 preferably detects an edge area of the area 110 and is disposed along a traveling path of the printing apparatus 300. In the parameter statistics, the number of pixels in the gray image of the second detection region 114 is counted, which corresponds to the gray value setting range. At this time, on the basis that the number of pixels in the first detection area is 56 ten thousand, 2 local detection areas are respectively selected, and along the traveling path of the printing apparatus 300, the local detection areas are respectively selected at the edge of the screen, that is, two second detection areas 114 are selected, and a large number of experiments show that a crack phenomenon often occurs in an area with the number of pixels of 8 ten thousand counted along the edge of the screen, so that only the local areas of the screen can be detected based on the purposes of improving the detection precision of the operating speed and reducing the response time of components, the number n of pixels in the second detection areas 114 is 8 ten thousand, and the screening condition of the number of pixels of the second preset image is greater than or equal to 3000. The number of the pixels of the screen cracks is irrelevant to the selection of the first detection area or the second detection area and relevant to the size of the screen fracture, so that the screening condition of the number of the pixels of the second preset image is still more than or equal to 3000 when local area detection is carried out.
As shown in FIG. 10, the direction of the arrow indicates the printing direction of the knife assembly, and B indicates the direction of the knife assemblyAnd finishing the terminal. At this time, the contrast parameter is set to b3I.e. the number of pixels of the preset image at this time. Setting the number of pixels in accordance with the gray level value setting range as c3C is mixing3And b3For comparison, when c3≥b3If so, the screen plate 100 is judged to be unqualified, indicating that the screen plate 100 has a crack, and if c is judged to be unqualified3＜b3If so, the screen plate 100 is judged to be qualified and no crack is generated.
Specifically, the detection principle of the system is that due to the difference in the colors of the screen 100, the scraper, the slurry and the silicon wafer, after the gray scale processing of the image, the image respectively presents different gray values, and the statistical probability is combined to judge whether an area with concentrated gray values appears, so as to judge whether the screen 100 has cracks or cracks. The screen 100 is broken, the screen 100 is damaged in a large area, the silicon chip is exposed in the vision, and the shot image area comprises a scraper, the screen 100, slurry and the silicon chip; the screen 100 is cracked, the screen 100 is only slightly damaged, and the shot image area includes: the scraper, the screen 100, and the slurry (the slurry falls on the silicon wafer through the mesh of the screen 100, and only the slurry is visible in the mesh area of the screen 100), a certain amount of the slurry falls on the silicon wafer, and further the slurry concentration phenomenon occurs. In the screen printing, the screen 100 is normally shot, and when the screen 100 is damaged, the slurry or the silicon wafer is exposed at the damaged position of the screen 100, and the slurry is detected when a crack occurs, and the silicon wafer is detected when the crack occurs in a large area. The screening condition of the gray scale range value and the number of pixels of the image refers to a proper value counted according to a large number of cracks or fissures. Specifically, as shown in connection with fig. 8, the detection region is set to a specified range, i.e., the operation range of the blades in the blade group device 310.
In a preferred embodiment, after each printing, the damage detection, i.e. the crack detection and the crack detection, are performed on the screen 100, which may be specifically performed in the following two cases:
in the first case:
the fracture detection may be performed first, followed by the crack detection. It can be understood that: when it is determined that the screen 100 is broken, and the crack detection is not performed, when it is determined that the screen 100 is not broken, the crack detection is performed, if it is determined that the screen 100 is broken, and if it is determined that the screen 100 is not broken, the screen 100 is not broken.
In the second case:
and carrying out crack detection firstly and then carrying out fracture detection. It can be understood that: when it is determined that the screen 100 has a crack, the screen 100 is damaged and no crack detection is performed, when it is determined that the screen 100 has no crack, the crack detection is performed, if it is determined that the screen 100 has a crack, the screen 100 is damaged, and if it is determined that the screen 100 has no crack, the screen 100 is not damaged.
Preferably, the second case is used because crack detection is performed in a local detection zone, and the response of the corresponding component is more sensitive, faster in operation, and less long in response time than full detection zone detection.
An embodiment of the second aspect of the present invention provides a screen printing apparatus, as shown in fig. 3 and 4, including a screen 100, a transportation device 200, a printing device 300, and a screen breakage detection system in any one of the embodiments of the first aspect. Wherein the surface of the screen 100 is pre-stored with slurry. The transport device 200 is used to transport a workpiece to below the screen 100. The printing apparatus 300 is located above the screen 100, and acts on the screen 100 to print the slurry pre-stored on the screen 100 onto the workpiece on the transporting apparatus 200, thereby completing the printing operation on the workpiece. The screen damage detection system can detect damage to the screen 100 to determine whether the screen 100 needs to be replaced.
In some embodiments, as shown in fig. 4, the image capturing device 10 in the screen damage detecting system includes a camera 400, a light source 500, and a support 600. In fig. 4, the arrow direction is a printing direction, and the camera 400 is configured to capture an image of the screen area to obtain image information of the screen area. The light source 500 is used to provide illumination to the screen area to improve the quality of the image captured by the camera 400. The camera 400 and the light source 500 are mounted on the stand 600 and mounted on the screen printing apparatus through the stand 600, so that the camera 400 and the light source 500 can be angularly adjusted by the stand 600. So that the screen area can be shot more accurately and clearly.
Specifically, the light source 500 is a bright light source, preferably a white light source. The white light source can form color difference contrast with the screen printing plate and the sizing agent during shooting, and imaging contrast is facilitated.
In certain embodiments, as shown in fig. 7, the screen printing apparatus further comprises a visual positioning device 700. The vision positioning device 700 is disposed at the front end of the transporter 200 and is used for shooting the front-end workpiece on the transporter 200. Meanwhile, the camera 400 and the light source 500 are also fixedly mounted on the visual positioning device 700 through the bracket 600. The front end workpiece means a workpiece which is not run to the same time as the workpiece is run to the position below the screen 100.
In some embodiments, as shown in fig. 3, the screen printing apparatus further includes an alignment adjustment device 800. After picking up the position information of the front end workpiece, the vision positioning apparatus 700 sends the position information to the alignment adjustment apparatus 800 through the control system. The screen 100 is provided in the alignment adjusting device 800, and after receiving the position information, the alignment adjusting device 800 can control the screen model to align the mesh of the screen 100 with the printing position of the workpiece, thereby improving the printing accuracy. The printing apparatus 300 is disposed above the alignment adjusting apparatus 800, and after the alignment adjusting apparatus 800 aligns the screen 100 with a workpiece located below the screen 100, the printing apparatus 300 prints the workpiece located below the screen 100.
In some embodiments, as shown in fig. 5 and 6, the bracket 600 includes a first bracket 610, a second bracket 620, a third bracket 630, and a fourth bracket 640. Wherein the rear end of the second support 620 is adjustably mounted on the first support 610 so that the angle can be adjusted on the first support 610, and the camera 400 is mounted on the front end of the second support 620. The front end of the third bracket 630 is connected to the rear end of the first bracket 610, and then the third bracket 630 is fixedly mounted on the visual positioning apparatus 700 through the lower end, so as to fix the third bracket 630. The upper end of the fourth holder 640 is fixedly installed at the lower end of the second holder 620, and the light source 500 is adjustably installed at the lower end of the fourth holder 640. When adjusting the angle of second support 620, the angle of camera 400 also can adjust thereupon, also can drive the light source 500 of fourth support 640 and below installation simultaneously and carry out synchronous adjustment to can make camera 400 and light source 500 remain relatively fixed position and angle throughout, be convenient for carry out image capture.
In some embodiments, as shown in fig. 5 and 6, a first screw hole 612 and a first kidney-shaped hole 614 are provided on the first bracket 610, and two second screw holes 622 are provided on the second bracket 620, wherein one of the second screw holes 622 and the first screw hole 612 correspond to each other and are connected through a connecting member, and can rotate; another second threaded hole 622 corresponds to the first kidney-shaped hole 614 and is also connected by a connecting member, wherein the second threaded hole 622 can slide around the first threaded hole 612 within the range of the first kidney-shaped hole 614, so as to adjust the angle of the second bracket 620.
A first adjustment hole 632 and a second adjustment hole 634 are formed on the third bracket 630, wherein the third bracket 630 and the first bracket 610 are fixedly connected through the first adjustment hole 632, and then the third bracket 630 is fixedly mounted on the visual positioning device 700 through the second adjustment hole 634. It should be noted that the first adjustment hole 632 and the second adjustment hole 634 are bar-shaped holes, so that a certain range of adjustment can be performed when the first adjustment hole is fixedly connected with the first bracket 610 or fixedly installed on the visual positioning apparatus 700.
A fourth screw hole 642 and a fourth kidney-shaped hole 644 are formed at the lower side of the fourth bracket 640, and two screw holes are formed at the housing of the light source 500, wherein one screw hole corresponds to the fourth screw hole 642 and is connected through a connecting piece, and the screw holes can rotate; the other position corresponds to the fourth kidney-shaped hole 644, and similarly, the connection is performed by using a connector, where the threaded hole can slide around the fourth threaded hole 642 within the range of the fourth kidney-shaped hole 644, so as to adjust the irradiation angle of the light source 500.
By interconnecting the four brackets, the remaining brackets, as well as the camera 400 and light source 500, may be secured to the visual positioning apparatus by the third bracket 630. And the photographing and illumination angles of the camera 400 and the light source 500 may also be adjusted to ensure the quality of the photographed picture.
When the screen printing plate is damaged, the replacement time of 10-20 minutes can be saved by producing the screen printing equipment in the embodiment, so that the capacity of the whole screen printing equipment is improved, and the market competitiveness of the equipment is greatly improved.
An embodiment of a third aspect of the present invention provides a method for detecting a damage of a screen, including the following steps:
and acquiring an image, namely acquiring an image of the screen 100 to obtain a screen image.
And processing the image, namely processing the information of the screen image to acquire the gray value of the screen image.
And judging the damage condition, namely judging the damage condition of the screen 100 according to the gray value of the screen image. Wherein the breakage of the screen 100 includes cracks and fissures.
The screen 100 is a screen after printing paste.
In one embodiment, acquiring the image comprises: the screen area is illuminated by a light source 500. And capturing an image of the screen area by the camera 400.
In one embodiment, processing the image includes: performing gray scale processing on the information of the screen image through an image processing module 20 to obtain a gray scale value of a gray scale image; and acquiring the number of pixels satisfying the gray value setting range in the gray image through the pixel acquisition module 32.
In one embodiment, determining a failure condition includes the following two conditions:
(1) judging that the screen 100 is broken includes:
the first detection area 112, i.e. the complete detection area of the screen 100, is selected, where the number of pixels in the first detection area 112 is m, and m is an integer greater than or equal to 1.
And acquiring the first pixel number, namely the number of pixels meeting the first gray value range.
The first grayscale value range is 0 or more and 40 or less, and here, the first grayscale value range is a grayscale value range of the workpiece. The first number of pixels is the number of pixels of the workpiece that can be seen from the broken portion in the gray-scale image after the screen 100 is broken.
And judging whether the image is cracked or not, namely comparing the number of the first pixels with the number of the first preset image pixels. When the number of the first pixels is greater than or equal to the number of the first preset image pixels, judging that the screen 100 is broken; when the number of the first pixels is smaller than the number of the first preset image pixels, it is determined that the screen 100 is not cracked.
The first preset number of image pixels is an empirical value, and is an empirical value of the number of image pixels at a screen fracture position when the screen fractures. It can also be understood that the first preset number of image pixels is: when the number of the pixels in the first detection area is m, the number of the pixels meeting the first gray value setting range at the broken position is obtained through a large number of tests if the screen is broken.
(2) Judging the screen 100 crack, including:
selecting a first detection area 112, namely a complete detection area of the screen 100, wherein the number of pixels of the first detection area 112 is m, and m is an integer greater than or equal to 1; or selecting a second detection area 114, namely a local detection area of the screen 100, wherein the second detection area 114 is located at the edge of the screen 100 and is arranged along the traveling direction of the printing apparatus 300, the number of pixels of the second detection area 114 is n, and n is an integer greater than or equal to 1.
And acquiring a second pixel number, namely the number of pixels meeting a second gray value range.
The second gray scale value range is 250 to 255 inclusive. Here, the second gray value range is a gray value range of the slurry. The second number of pixels is the number of pixels of the paste that can be seen from the crack in the gray-scale image when the screen 100 has a crack.
And judging whether a crack is generated, namely comparing the number of the second pixels with the number of the second preset image pixels. When the number of the second pixels is larger than or equal to the number of the second preset image pixels, judging that the screen 100 has cracks; and when the number of the second pixels is smaller than the number of the second preset image pixels, judging that the screen 100 has no crack.
It should be noted that, in the following description,
when the first detection area is selected:
the first preset image pixel number is: and when the number of the pixels in the first detection area is m, the number of the pixels meeting the set range of the first gray value at the crack position if the screen plate cracks is obtained through a large number of tests.
When the second detection region is selected:
the second preset image pixel number is an empirical value, and is an empirical value of the image pixel number at the screen crack when the screen crack occurs. It can also be understood that the second predetermined number of image pixels is: and when the number of the pixels in the second detection area is n, n is less than m, and the number of the pixels meeting the second gray scale value setting range at the crack position if the screen plate cracks is obtained through a large number of tests.
In one embodiment, the screen damage detection method is described in more detail.
As shown in fig. 11, the method comprises the following steps:
and step 1000, conveying the slurry to a screen printing plate.
After the slurry is transferred to the screen 100, for subsequent printing, the slurry is scraped evenly on the screen 100 by the knife set device 310 of the printing device 300, so that the slurry is printed on the printing area of the workpiece through the mesh of the screen 100.
And 2000, transporting the workpiece to the lower part of the screen plate by the transporting device.
The workpiece is transported below the screen 100 by the transport device 200 to facilitate the subsequent printing thereof.
When the printing apparatus 300 prints on the screen 100 and the workpiece, the knife set 310 of the printing apparatus 300 scrapes the slurry on the surface of the screen 100 evenly on the surface of the screen 100, so that the slurry can be printed on the workpiece below through the mesh of the screen 100. Specifically, before the printing apparatus 300 performs printing, the alignment adjustment apparatus 800 first aligns the screen 100 and the workpiece so that the mesh of the screen 100 and the workpiece are aligned.
And 4000, acquiring an image of the screen area by the image acquisition device, and acquiring image information.
Here, when the screen area is to be image-captured, the screen 100 is a screen on which paste is printed.
And step 5000, the image processing module processes the image information to acquire a processed image.
Here, when the image processing module 20 processes the image, specifically, the image may be subjected to a gray scale process, so that the image information is converted into a gray scale image to obtain a gray scale value of the gray scale image. The image processing module 20 is activated when the control system of the screen printing apparatus monitors the presence of image data to perform image processing when processing an image.
And 6000, judging the damage condition of the screen plate by the control unit according to the processed image.
Here, the control unit 30 may perform the determination based on the converted grayscale image when performing the determination, and the determination based on the grayscale image may reduce the amount of calculation in the determination.
It should be noted that before all steps are performed, parameter setting needs to be performed through a software setting interface of the screen printing device, after the parameter setting is completed, the screen printing device is set to be in an automatic state, and then the screen printing device starts to operate, so that normal production of the screen printing device is started.
In some embodiments, as shown in fig. 12, the image capturing device 10 captures an image of a screen area and acquires image information, including the following steps:
After the light source 500 illuminates the screen area, the brightness of the screen area can be improved, and the image information acquired during image acquisition can be clearer and more accurate.
In step 4200, the screen area is photographed by a camera.
Here, when the camera 400 is used for shooting, a clearer image can be obtained after the light source 500 is used for illumination, so that the subsequent judgment is more accurate.
It should be noted that when the workpiece is moved to the printing position below the screen 100, the knife set device 310 of the printing apparatus 300 starts to operate, and the control system of the screen printing apparatus triggers the light source 500 to light up, and when the knife set device 310 is moved to the distance completion position, the camera 400 is triggered to capture an image. Specifically, the time required from the start of photographing by the camera 400 to the completion of photographing is 15 ms.
In some embodiments, as shown in fig. 13, the determining, by the control unit 30, the damage condition of the screen 100 according to the gray-scale image includes the following steps:
The number of pixels satisfying the gradation value setting range is set to c.
In step 6200, c and b are compared by the pixel comparison module.
The contrast parameter b, i.e. the number of pixels in the preset image, is set to be the number of pixels satisfying the range of the gray scale value within the set range of the damaged gray scale image. Namely, the set number of pixels satisfying the gray scale value range of the silicon wafer at the fracture or the set number of pixels satisfying the gray scale value range of the slurry at the fracture.
The number c of pixels satisfying the gray scale value setting range is compared with the contrast parameter b by the pixel contrast module 34.
And 6300, judging the comparison result through a result judgment module.
Here, when the result judging module 36 judges that c is greater than or equal to b, it indicates that the screen is damaged, and the comparison result is unqualified, and at this time, a display screen displays the unqualified screen, and an alarm device responds to prompt field personnel to process and replace the screen in time. When c is smaller than b, it indicates that no damage occurs, the comparison result is qualified, the display screen shows qualified results, and the printing device 300 performs the next printing operation.
It should be noted that, after the result is determined, the result determining module 36 may send a signal to the control system of the screen printing apparatus at the same time, and the control system may control the display screen of the screen printing apparatus to display a pass or fail, and control the screen printing apparatus to stop operating, and perform an alarm response at the same time. After the worker finds the alarm, the worker removes the screen printing plate, cleans one table board, replaces the table board paper of one table board, and installs a new screen printing plate.
The method can detect the damage of the screen plate in time, thereby saving the time for replacing the screen plate for each time by 10-20 minutes.
In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for detecting damage to a screen, comprising:
acquiring an image, namely acquiring the image of the screen to obtain a screen image;
processing the image, namely processing the information of the screen image to acquire the gray value of the screen image;
judging the damage condition, namely judging the damage condition of the screen according to the gray value of the screen image;
wherein, the breakage condition of the screen printing plate comprises breakage and cracks.
2. The method of detecting damage to a screen according to claim 1,
the screen printing plate is printed by the slurry.
3. The method of detecting damage to a screen according to claim 2,
the acquiring of the image includes:
illuminating the screen area through a light source; and
and shooting the image of the screen area by a camera.
4. The method for detecting breakage of a screen according to any one of claims 1 to 3,
the processing the image includes:
carrying out gray level processing on the information of the screen image through an image processing module to obtain a gray level value of a gray level image;
and acquiring the number of pixels meeting the gray value setting range in the gray image through a pixel acquisition module.
5. The method of detecting damage to a screen according to claim 4,
judging the screen plate is broken comprises:
selecting a first detection area, namely a complete detection area of the screen printing plate, wherein the number of pixels of the first detection area is m, and m is an integer greater than or equal to 1;
acquiring a first pixel number, namely the number of pixels meeting a first gray value range;
judging whether the crack is broken, namely:
comparing the number of the first pixels with the number of first preset image pixels;
when the number of the first pixels is more than or equal to the number of the first preset image pixels, judging that the screen printing plate is broken;
when the number of the first pixels is smaller than the number of the first preset image pixels, judging that the screen printing plate is not broken;
the first gray value range is greater than or equal to 0 and less than or equal to 40;
when the screen is broken, the number of the first preset image pixels is the number of the image pixels at the broken part of the screen.
6. The method of detecting damage to a screen according to claim 4,
judging the screen plate crack comprises:
selecting a first detection area, namely a complete detection area of the screen printing plate, wherein the number of pixels of the first detection area is m, and m is an integer greater than or equal to 1; or
Selecting a second detection area, namely a local detection area of the screen printing plate, wherein the second detection area is positioned at the edge of the screen printing plate and is arranged along the traveling direction of the printing device, the number of pixels of the second detection area is n, and n is an integer greater than or equal to 1;
acquiring a second pixel number, namely the number of pixels meeting a second gray value range;
judging whether a crack exists, namely:
comparing the number of the second pixels with the number of second preset image pixels;
when the number of the second pixels is larger than or equal to the number of the second preset image pixels, judging the screen plate crack;
when the number of the second pixels is smaller than the number of the second preset image pixels, judging that the screen printing plate has no crack;
the second gray scale value range is greater than or equal to 250 and less than or equal to 255;
when the screen is cracked, the number of the second preset image pixels is equal to the number of the image pixels at the crack of the screen.
7. The utility model provides a damaged detecting system of half tone which characterized in that for screen printing equipment, includes:
the image acquisition device is used for acquiring image information of the screen area;
the image processing module is used for receiving the image information acquired by the image acquisition device and processing the image information to obtain a processed image;
the control unit is used for judging the damage condition of the screen plate according to the processed image;
the damage condition of the screen printing plate comprises cracking and cracks.
8. A screen printing apparatus characterized by comprising:
the screen printing plate is pre-stored with slurry on the surface;
the conveying device is used for conveying the processed parts to the position below the screen;
the printing device is used for printing the slurry on the screen printing plate on the workpiece; and
the screen damage detection system of claim 7, configured to detect a damage of the screen.
9. The screen printing apparatus according to claim 8,
the image acquisition device comprises:
the camera is used for shooting the image of the screen area;
the light source is used for providing illumination for the screen area; and
a bracket for adjusting and fixing the camera and the light source; the light source adopts a bright color light source;
the irradiation area of the light source covers the shooting area of the camera.
10. The screen printing apparatus according to claim 9, further comprising:
the visual positioning device is arranged at the front end of the conveying device and used for shooting a front-end workpiece on the conveying device;
the camera and the light source are mounted on the visual positioning device through the bracket.
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| CN202110579286.3A CN113447487A (en) | 2021-05-26 | 2021-05-26 | Screen damage detection method, screen damage detection system and screen printing equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114523758A (en) * | 2022-02-14 | 2022-05-24 | 苏州市中辰昊科技有限公司 | Solar cell printing and screen printing plate wiping mechanism |
| CN117329990A (en) * | 2023-09-26 | 2024-01-02 | 常州市三洋精密制版有限公司 | Screen plate making silk screen angle measuring device |
-
2021
- 2021-05-26 CN CN202110579286.3A patent/CN113447487A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114523758A (en) * | 2022-02-14 | 2022-05-24 | 苏州市中辰昊科技有限公司 | Solar cell printing and screen printing plate wiping mechanism |
| CN114523758B (en) * | 2022-02-14 | 2023-01-03 | 苏州市中辰昊科技有限公司 | Solar cell printing and screen printing plate wiping mechanism |
| CN117329990A (en) * | 2023-09-26 | 2024-01-02 | 常州市三洋精密制版有限公司 | Screen plate making silk screen angle measuring device |
| CN117329990B (en) * | 2023-09-26 | 2024-04-12 | 常州市三洋精密制版有限公司 | Screen plate making silk screen angle measuring device |
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