Ink jet characteristic measurement method, system and device and storage medium

Abstract

The invention relates to the technical field of ink-jet characteristic measurement, in particular to an ink-jet characteristic measurement method, system and device and a storage medium, efficient ink-jet starting control is guaranteed through an upper industrial personal computer, and stable, accurate and timely ink jet is guaranteed through a nozzle driving plate; the camera device captures an instruction to complete image capture for subsequent analysis; the iterative operation is combined with an image fusion algorithm to realize rapid, continuous and accurate measurement of the arrayed nozzle and assist feature recognition; ink droplet characteristics obtained through an image recognition method are beneficial to accurate analysis, the characteristics are comprehensively obtained through movement and repeated operation of the moving table, ink jet characteristics are generated, optimization of an ink jet system is powerfully supported, and product quality and production efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of inkjet characteristic measurement, and in particular to an inkjet characteristic measurement method, system, equipment and storage medium. Background Art

[0002] Inkjet printing has shown great potential in the field of electronic device production and has attracted much attention, with high hopes of replacing traditional manufacturing technology. This technology prints the specified semiconductor material into liquid and then prints it onto a substrate. The products produced have excellent properties and have the advantages of high material utilization, simple operation, easy control and low cost. Its application potential in the manufacture of organic light-emitting semiconductors (OLEDs) is particularly prominent;

[0003] However, there are some problems at present. First, the inkjet control of the arrayed nozzles is not precise enough. This is because there are differences in the structure and state of each nozzle hole of the nozzle, and the piezoelectric nozzle has crosstalk problems, and is affected by factors such as aging, environmental changes and nozzle hole blockage, resulting in inconsistent ink droplet volume, which seriously affects the printing quality; second, in terms of observing the characteristics of ink droplets, ordinary photography methods have low camera frame rates and are difficult to cope with high-frequency ink droplet ejection of more than thousands of times per second, and it is difficult to directly capture the dynamics of ink droplets. At the same time, ordinary zoom lenses have low zoom efficiency and cannot perform rapid and continuous observation of arrayed nozzles, which takes a long time. Summary of the invention

[0004] In order to solve the above-mentioned shortcomings in the prior art, the present invention proposes an inkjet characteristic measurement method, device, equipment and storage medium.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] The inkjet characteristic measurement method is applied to the inkjet characteristic measurement system, the inkjet characteristic measurement system comprises: a host industrial computer, a nozzle, a nozzle, a nozzle driving board, a motion platform and a camera device, the host industrial computer is electrically connected to the nozzle, the nozzle, the nozzle driving board, the motion platform and the camera device, the nozzle driving board is electrically connected to the nozzle and the nozzle, the inkjet characteristic measurement method comprises the steps of: issuing an inkjet instruction to start the specified nozzle through the host industrial computer; obtaining the inkjet instruction through the nozzle driving board, and driving the nozzle to start inkjet according to the inkjet instruction; capturing the inkjet instruction through the camera device, and completing an inkjet image according to the inkjet instruction Capture; return to execute to drive the nozzle to start inkjet through the nozzle driving board until the preset first iteration preset condition is met; then obtain all captured inkjet images, fuse the inkjet images using the image fusion algorithm to obtain a fused image; perform feature recognition on the fused image based on the image recognition method to obtain ink droplet characteristics; generate a lateral movement instruction according to the ink droplet characteristics, control the lateral movement of the motion stage according to the lateral movement instruction, and return to execute the inkjet instruction to start the specified nozzle through the upper industrial computer until the preset second iteration condition is met, obtain all ink droplet characteristics, and generate inkjet characteristics according to all ink droplet characteristics. The instructions issued by the upper industrial computer ensure that the start-up control of the inkjet process is centralized and efficient. The nozzle driver board accurately obtains the instructions and drives the nozzle to spray ink, ensuring the stability, accuracy and timeliness of the inkjet operation; the inkjet instructions are captured by the camera device and the image capture is completed, providing a data basis for subsequent analysis; through continuous iteration of inkjet and image capture, the image fusion algorithm is used to obtain a fused picture, which can integrate multiple ink droplet image information to achieve fast and continuous accurate measurement of arrayed nozzles, which is time-saving and provides a more accurate basis for feature recognition; the ink droplet characteristics are obtained based on the image recognition method, which helps to accurately analyze the characteristics of the ink droplets; the motion stage is moved laterally and the whole process is repeated until the second iteration conditions are met, so that all ink droplet characteristics can be fully obtained and inkjet characteristics can be generated, which provides strong support for the quality control and performance optimization of the inkjet system and improves the quality and production efficiency of inkjet products.

[0007] Further, the camera device includes a camera control unit, a lower industrial computer, a light source driver, a super depth of field lens and a shutter, the camera control unit is electrically connected to the super depth of field lens, the shutter and the lower industrial computer, the lower industrial computer is electrically connected to the light source driver, and the inkjet instruction is captured by the camera device, and an inkjet image is captured according to the inkjet instruction, including: capturing the inkjet instruction through the camera control unit, and controlling the super depth of field lens to work according to the inkjet instruction; obtaining the working state of the super depth of field lens through the camera control unit to obtain a first working state; analyzing the first working state Analysis; when the first working state is that the auto focus and zoom have been completed, the shutter is controlled to open through the camera control unit; the working state of the shutter is obtained through the camera control unit to obtain the second working state; the second working state is analyzed; when the second working state is that the shutter has been opened, a feedback signal is generated; the feedback signal is captured by the lower industrial computer, and the light source driver is controlled to work according to the feedback signal; the working state of the light source driver is obtained to obtain the third working state; the third working state is analyzed; when the third working state is that the second strobe has been completed, the camera control unit completes the capture of an inkjet image. Through the coordinated work of the camera control unit, the lower industrial computer and the light source driver, the super depth of field lens, shutter and light source driver can be accurately controlled to achieve high-quality capture of the inkjet image; the super depth of field lens ensures the clarity of the image and the adaptability to inkjet at different distances, the precise control of the shutter ensures the accurate timing of image capture, and the control of the light source driver by the lower industrial computer enables the camera control unit to shoot under suitable light source conditions; through real-time analysis and feedback of the working state of each device, the stability and reliability of the entire system are improved, providing strong support for accurate measurement of inkjet characteristics.

[0008] Furthermore, the inkjet instruction is captured by the camera control unit, and the operation of the super depth of field lens is controlled according to the inkjet instruction, including: obtaining the field of view of the camera control unit, and calculating the coordinates of different nozzles in the nozzle according to the field of view and the preset range; the super depth of field lens completes the automatic full focus, multi-focus, zoom, and focus based on the inkjet signal, coordinates, and the preset first parameter. The nozzle nozzle coordinates are determined by the field of view of the camera control unit, and the position of the camera control unit and the light source are fixed to ensure that the field of view of the camera control unit is bright and clear, which is conducive to subsequent observation; with the help of the super depth of field lens, relying on the unique zoom principle and excellent performance, a variety of focusing functions are realized, and the ink droplets of different columns of nozzles can be photographed in super depth of field, which greatly improves the observation efficiency of the ink droplet observation instrument and helps to accurately measure the inkjet characteristics.

[0009] Furthermore, the method of capturing the feedback signal through the lower industrial computer and controlling the operation of the light source driver according to the feedback signal includes: capturing the feedback signal through the lower industrial computer and controlling the light source driver to perform the first strobe according to the feedback signal to obtain the first strobe time; obtaining the strobe characteristics of the light source driver and calculating the delay waiting time according to the strobe characteristics and the first strobe time; and controlling the light source driver to perform the second strobe according to the delay waiting time. The light source driver is controlled by the lower industrial computer to perform the first strobe to provide a start signal for subsequent operations; the delay time is determined according to system experience to ensure the accuracy and stability of the operation; the strobe characteristics are obtained and the delay waiting time is calculated to accurately control the timing of the second strobe; finally, through precise strobe control, the image can be better captured in the inkjet characteristic measurement, providing strong support for the accurate analysis of the inkjet characteristics and improving the measurement accuracy and efficiency.

[0010] Furthermore, the feature recognition of the fused image based on the image recognition method to obtain the ink droplet characteristics includes: selecting the ROI area of ​​the fused image according to the preset second parameter; and using the image recognition algorithm to identify the ROI area to obtain the ink droplet contour; calculating the ink droplet contour based on the reverse calculation method to obtain the three-dimensional structure of the ink droplet; calculating the ink droplet volume according to the ink droplet contour and the three-dimensional structure; calculating the motion trajectory of the ink droplet by the preset third parameter and the ROI area; calculating the motion trajectory based on the differential operation method to obtain the speed and direction of the ink droplet; generating the ink droplet characteristics according to the ROI area, the ink droplet contour, the three-dimensional structure, the ink droplet volume, the motion trajectory, the speed and direction. Starting from selecting the ROI area of ​​the fused image, the image recognition algorithm, the reverse calculation method, the preset parameters and the operation method are gradually used to accurately obtain the characteristics of the ink droplet contour, the three-dimensional structure, the volume, the motion trajectory, the speed and direction. This not only improves the accuracy and comprehensiveness of the analysis of ink droplet characteristics, but also provides a strong basis for the adjustment and optimization of the inkjet system; it can better control the inkjet process, improve the inkjet quality, and reduce product defects caused by unstable ink droplet characteristics. It is of great significance for the application of inkjet technology in the fields of electronic device production.

[0011] Furthermore, when the third working state is that the second strobe has been completed, the camera is used to capture an inkjet image, including: calibrating the internal and external parameters of the camera control unit according to the preset fourth parameter; setting the size of the captured image according to the internal and external parameters; when the third working state is that the second strobe has been completed, the camera control unit is controlled to capture an inkjet image according to the size. By calibrating the internal and external parameters of the camera control unit by the preset fourth parameter, the relevant parameters of the camera imaging can be accurately determined to improve the image accuracy; then the captured image size is set according to the internal and external parameters, and can be reasonably set based on the corresponding spatial size of the pixel point; finally, when the third working state is met, the inkjet image is captured according to the set size, ensuring that a high-quality inkjet image that meets the requirements is obtained, and a reliable data basis is provided for the subsequent accurate analysis of inkjet characteristics.

[0012] Furthermore, before capturing the inkjet instruction through the camera device and completing the capture of an inkjet image according to the inkjet instruction, it includes: obtaining the inkjet instruction through the lower-level industrial computer, shielding the capture interrupt function according to the inkjet instruction, and sending the inkjet instruction to the camera device. After the lower-level industrial computer obtains the inkjet instruction, by shielding the capture interrupt function and sending the instruction to the camera device, it can ensure that the instruction is accurately transmitted, avoid interference, and ensure that the inkjet image capture is carried out in an orderly manner.

[0013] Furthermore, an inkjet characteristic measurement system is provided, which includes: a control device and a host industrial computer, a printhead, a nozzle, a printhead driving board, a motion platform and a camera device electrically connected to the control device; the control device is used to execute the inkjet characteristic measurement method as described in any one of the above items.

[0014] Further, an inkjet characteristic measurement device includes: a memory and at least one processor, wherein the memory stores instructions;

[0015] At least one of the processors calls the instructions in the memory to enable the inkjet characteristic measurement device to perform each step of the inkjet characteristic measurement method as described in any one of the above.

[0016] Furthermore, a computer-readable storage medium is provided, on which instructions are stored, wherein when the instructions are executed by a processor, each step of the inkjet characteristic measurement method as described above is implemented.

[0017] The beneficial effects of the inkjet characteristic measurement method of the present invention are:

[0018] The instructions issued by the upper industrial computer ensure that the start-up control of the inkjet process is centralized and efficient. The nozzle driver board accurately obtains the instructions and drives the nozzle to spray ink, ensuring the stability, accuracy and timeliness of the inkjet operation; the inkjet instructions are captured by the camera device and the image capture is completed, providing a data basis for subsequent analysis; through continuous iteration of inkjet and image capture, the image fusion algorithm is used to obtain a fused picture, which can integrate multiple ink droplet image information to achieve fast and continuous accurate measurement of arrayed nozzles, which is time-saving and provides a more accurate basis for feature recognition; the ink droplet characteristics are obtained based on the image recognition method, which helps to accurately analyze the characteristics of the ink droplets; the motion stage is moved laterally and the whole process is repeated until the second iteration conditions are met, so that all ink droplet characteristics can be fully obtained and inkjet characteristics can be generated, which provides strong support for the quality control and performance optimization of the inkjet system and improves the quality and production efficiency of inkjet products. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A first flow chart of the inkjet characteristic measurement method provided by an embodiment of the present invention;

[0020] Figure 2 A second flow chart of the inkjet characteristic measurement method provided by an embodiment of the present invention;

[0021] Figure 3 A third flow chart of the inkjet characteristic measurement method provided by an embodiment of the present invention;

[0022] Figure 4 A fourth flow chart of the inkjet characteristic measurement method provided by an embodiment of the present invention;

[0023] Figure 5 A fifth flow chart of the inkjet characteristic measurement method provided by an embodiment of the present invention;

[0024] Figure 6 A sixth flow chart of the inkjet characteristic measurement method provided by an embodiment of the present invention;

[0025] Figure 7 A seventh flow chart of the inkjet characteristic measurement method provided by an embodiment of the present invention;

[0026] Figure 8 A schematic diagram of the structure of an inkjet characteristic measurement system provided by an embodiment of the present invention;

[0027] Fig. 9 A schematic diagram of the structure of an inkjet characteristic measurement device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" or "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] The present invention discloses an inkjet characteristic measurement method, which can quickly test multiple rows and columns of nozzles of a matrix nozzle. In the present invention, a light source (a parallel collimated light source is used as the light source), a light source driver, a camera device, an ultra-depth-of-field lens, a motion table, a host industrial computer, a lower industrial computer, an inkjet nozzle, a nozzle driver board, and an ink supply system platform can be built.

[0031] For ease of understanding, the specific process of the embodiment of the present invention is described below. Figure 1 , an inkjet characteristic measurement method is applied to an inkjet characteristic measurement system, the inkjet characteristic measurement system includes: a host industrial computer, a nozzle, a nozzle, a nozzle driving board, a motion platform and a camera device, the host industrial computer is electrically connected to the nozzle, the nozzle, the nozzle driving board, the motion platform and the camera device, the nozzle driving board is electrically connected to the nozzle and the nozzle, an embodiment of an inkjet characteristic measurement method in an embodiment of the present invention includes:

[0032] 101. Sending an inkjet instruction to start the designated nozzle through the upper industrial computer;

[0033] 102. Obtaining an inkjet instruction through a nozzle driving board, and driving the nozzle to start inkjet according to the inkjet instruction;

[0034] In this embodiment, after the nozzle driving board receives the inkjet pulse, it drives the piezoelectric inkjet nozzle to start inkjet. The delay time from the upper industrial computer sending the inkjet signal to the ink droplets being ejected from the nozzle is recorded as delay1. Delay1 is obtained based on different experiences in system selection and layout. Generally, the value of delay1 is controlled at 100-200 microseconds.

[0035] 103. Capturing the inkjet instruction through a camera device, and completing the capture of an inkjet image according to the inkjet instruction;

[0036] In this embodiment, each time the capture of an inkjet image is completed, the system needs to recapture the interrupt function, which is used to coordinate the inkjet process and the image capture process; when the upper industrial computer issues an inkjet instruction, the nozzle driver board drives the nozzle to spray ink, and the camera device captures the inkjet image at the same time; and each time the inkjet image is captured, the system recaptures the interrupt function, which is like a metronome or synchronization signal to ensure that the entire inkjet image capture process can be carried out in an orderly manner according to a certain rhythm;

[0037] 104. Return to execution and drive the nozzle to start inkjet by the nozzle driving board until the preset first iteration preset condition is met; then obtain all captured inkjet images; and fuse the inkjet images using the image fusion algorithm to obtain a fused image;

[0038] In this embodiment, steps 101 to 103 are continuously repeated to acquire images until the acquisition of inkjet images ejected from nozzles in different rows and the same column is completed; the first iteration condition is to complete the acquisition of ink droplet images ejected from nozzles in different rows and the same column; then, the image fusion algorithm is used to fuse the ink droplet images ejected from nozzles in different rows and the same column acquired this time into one image to obtain a fused image;

[0039] 105. Perform feature recognition on the fused image based on an image recognition method to obtain ink droplet characteristics;

[0040] 106. Generate a lateral movement instruction according to the ink droplet characteristics, control the lateral movement of the motion platform according to the lateral movement instruction, and return to execute the inkjet instruction for starting the specified nozzle issued by the upper industrial computer until the preset second iteration condition is met, obtain all the ink droplet characteristics, and generate inkjet characteristics according to all the ink droplet characteristics.

[0041] In this embodiment, the moving stage is moved horizontally, and steps 101-106 are repeated again to complete the measurement of the ink droplet characteristics of a new set of nozzles located in different rows and the same vertical column (the nozzles of the same column and different rows of the nozzles are all misaligned in space), until the measurement of the ink droplet characteristics of the nozzles of the entire nozzle is completed. The second iteration condition refers to completing the measurement of the ink droplet characteristics of the nozzles located in the entire nozzle to obtain the inkjet characteristics;

[0042] The upper industrial computer issues the inkjet command, ensuring that the start-up control of the entire inkjet process is centralized and efficient; the nozzle driver board can accurately obtain the command and drive the nozzle to spray ink, controlling the delay time within a reasonable range of 100-200 microseconds, which not only ensures the timeliness of the response, but also can make empirical adjustments according to different system selections and layouts, improving the stability and reliability of the inkjet operation; the camera device captures the inkjet command, so that each inkjet can be accurately recorded; after each capture, the interrupt function is recaptured to ensure the accuracy and real-time nature of image capture; by repeating specific steps, the ink jets from the nozzles in different rows and the same column can be obtained. Ink images are obtained by fusion, and then the images are fused into a high-quality fused image using an image fusion algorithm. This fusion processing method can integrate the information of multiple ink droplet images, providing a more accurate basis for subsequent feature recognition. Feature recognition of the fused image based on the image recognition method can accurately obtain the ink droplet characteristics. The motion stage is moved laterally and the whole process is repeated until the ink droplet characteristics of the nozzles of the entire printhead are measured, ensuring full coverage and accurate analysis of each nozzle. This iterative measurement method can adapt to the spatial misalignment of nozzles in different rows of printheads, ensuring that the inkjet characteristics obtained can truly reflect the actual working status of the entire printhead.

[0043] The camera device includes a camera control unit, a lower industrial computer, a light source driver, a super depth of field lens and a shutter. The camera control unit is electrically connected to the super depth of field lens, the shutter and the lower industrial computer. The lower industrial computer is electrically connected to the light source driver. Figure 2 A second embodiment of an inkjet characteristic measurement method in an embodiment of the present invention includes:

[0044] 201. Capturing the inkjet instruction through the camera control unit, and controlling the ultra-depth-of-field lens to work according to the inkjet instruction;

[0045] Ensure that the camera control unit can respond quickly to inkjet instructions, and use the ultra-depth of field lens to provide a good foundation for subsequent accurate capture of inkjet images;

[0046] 202. Acquire the working state of the super depth of field lens through a camera control unit to obtain a first working state;

[0047] 203. Analyze the first working state;

[0048] Ability to monitor the working condition of the ultra-depth-of-field lens in real time, so as to make timely adjustments and ensure that it is in the best working condition, and prepare for subsequent image capture;

[0049] 204. When the first working state is that the automatic focus and zoom have been completed, the camera control unit controls the shutter to open;

[0050] 205. Acquire the working state of the shutter through the camera control unit to obtain a second working state;

[0051] 206. Analyze the second working state;

[0052] Knowing the shutter's working status can ensure that the camera control unit captures the image at the right time, avoiding missing critical inkjet images due to shutter problems;

[0053] 207. When the second working state is that the shutter has been opened, a feedback signal is generated;

[0054] Timely feedback of the shutter status enables the subsequent light source driver to work accurately with the camera control unit, improving the coordination of the entire system.

[0055] 208. Capture the feedback signal through the lower industrial computer, and control the operation of the light source driver according to the feedback signal;

[0056] The lower-level industrial computer can accurately control the light source driver according to the feedback from the camera control unit, ensuring that the light source provides sufficient illumination for the camera control unit at the right time, thereby improving image quality.

[0057] 209. Acquire the working state of the light source driver to obtain a third working state;

[0058] 210. Analyze the third working state;

[0059] 211. When the third working state is that the second stroboscopic operation has been completed, the camera control unit completes the capture of an inkjet image.

[0060] The use of stroboscopic technology can accurately capture the instantaneous inkjet image in the case of high-speed inkjet, improve the clarity and accuracy of the image, and provide reliable data for subsequent analysis of inkjet characteristics.

[0061] In this embodiment, through the coordinated work of the camera control unit, the lower industrial computer and the light source driver, the super depth of field lens, the shutter and the light source driver can be accurately controlled to achieve high-quality capture of the inkjet image; the super depth of field lens ensures the clarity of the image and the adaptability to inkjet at different distances, the precise control of the shutter ensures the accurate timing of image capture, and the control of the light source driver by the lower industrial computer enables the camera control unit to shoot under appropriate light source conditions; through real-time analysis and feedback of the working status of each device, the stability and reliability of the entire system are improved, providing strong support for accurate measurement of inkjet characteristics.

[0062] The spray head includes a nozzle, see Figure 3A third embodiment of an inkjet characteristic measurement method in an embodiment of the present invention includes:

[0063] 301. Obtain the field of view of the camera control unit, and calculate the coordinates of different nozzles in the nozzle according to the field of view and a preset range;

[0064] In this embodiment, the position of the camera control unit can be adjusted so that the designated nozzle to be tested is located near the field of view of the camera control unit; by fixing the relative positions of the camera control unit and the light source and aligning the center of the light source with the main axis of the camera lens in the camera control unit, the field of view of the camera control unit can be bright and clear; when adjusting the positions of the light source and the camera control unit, first drive the light source to be always on to ensure that the center of the light source is parallel to the main axis of the camera lens and basically overlaps with it.

[0065] 302. Automatic full focus, multi-focus, zoom, and focus are completed through the ultra-depth-of-field lens based on the inkjet signal, coordinates, and the preset first parameter.

[0066] In this embodiment, the ultra-depth-of-field lens is a digital lens element that can accurately realize the curvature change of the traditional zoom lens. The zoom principle is to accurately fit the required lens curvature shape through the micro-mirror array system (Micro-Mirror Array Lens Systems) attached to the CMOS surface. The lens can achieve full focus, multi-focus, and auto-focus functions by high-speed fine-tuning of the micro-mirror array composed of hundreds to thousands of individual micro-mirrors; its driving speed is greater than 12KHz, its impact resistance is greater than 5000G, its operating temperature is between -30-100 degrees Celsius, and its declaration cycle is greater than 5 billion cycles. Through this variable-focus technology, ultra-depth-of-field shooting of ink droplets ejected from different columns of nozzles with different front-to-back misalignments can be achieved, greatly improving the observation efficiency of the ink droplet observation instrument.

[0067] In this embodiment, the nozzle coordinates of the printhead are determined by the field of view of the camera control unit, and the position of the camera control unit and the light source are fixed to ensure that the field of view of the camera control unit is bright and clear, which is conducive to subsequent observation; with the help of the ultra-depth of field lens, relying on the unique zoom principle and excellent performance, a variety of focusing functions are realized, and ultra-depth of field photography of ink droplets in different columns of nozzles can be performed, which greatly improves the observation efficiency of the ink droplet observation instrument and helps to accurately measure the inkjet characteristics.

[0068] A fourth embodiment of an inkjet characteristic measurement method according to an embodiment of the present invention includes:

[0069] 401. Capturing a feedback signal through a lower-level industrial computer, and controlling a light source driver to perform a first strobe according to the feedback signal to obtain a first flashing time;

[0070] In this embodiment, the delay from the upper industrial computer sending the inkjet signal to the light source driver driving the first light source process is recorded as delay2, where delay2 is greater than delay1. Delay2 is obtained based on different experiences in system selection and layout. Generally, the value of delay2 is controlled at 100-200 microseconds.

[0071] 402. Obtain the stroboscopic characteristics of the light source driver, and calculate the delayed waiting time according to the stroboscopic characteristics and the first flashing time;

[0072] 403. Control the light source driver to perform a second strobe operation according to the delayed waiting time.

[0073] In this embodiment, the two-stroboscopic exposure method is generally referred to as double exposure. Since ordinary cameras cannot provide extremely high shutter speeds, it is difficult to capture the cleaning image of ink droplets in motion. Double exposure means that during the period when the camera shutter is open, the light source (LED or laser) flashes twice quickly (usually less than 1 microsecond) to capture the image of the droplet at different times after leaving the nozzle. The shorter the flashing time of the stroboscopic light source, the clearer the edge contour of the droplet.

[0074] The first strobe is performed by controlling the light source driver through the lower-level industrial computer to provide a starting signal for subsequent operations; the delay time is determined based on system experience to ensure the accuracy and stability of the operation; the strobe characteristics are obtained and the delay waiting time is calculated to accurately control the timing of the second strobe; finally, through precise strobe control, the image can be better captured in the inkjet characteristic measurement, providing strong support for the accurate analysis of inkjet characteristics and improving the measurement accuracy and efficiency.

[0075] A fifth embodiment of an inkjet characteristic measurement method according to an embodiment of the present invention includes:

[0076] 501. Selecting a ROI region of the fused image according to a preset second parameter;

[0077] In this embodiment, key areas can be selected for analysis in a targeted manner to improve the efficiency of subsequent processing and reduce unnecessary calculations;

[0078] 502. Using an image recognition algorithm to identify the ROI area to obtain an ink droplet outline;

[0079] By accurately determining the shape boundary of the ink drop, it provides a basis for further analysis of the ink drop characteristics;

[0080] 503. Inferring the ink droplet profile based on a reverse calculation method to obtain a three-dimensional structure of the ink droplet;

[0081] A more comprehensive understanding of the spatial morphology of ink droplets provides support for accurate calculation of properties such as volume;

[0082] 504. Calculate the volume of the ink drop according to the ink drop profile and the three-dimensional structure;

[0083] 505. Obtain the motion trajectory of the ink droplet by calculating the preset third parameter and the ROI area;

[0084] In this embodiment, the third parameter includes an inkjet port position parameter, an inkjet pressure parameter and an environmental resistance coefficient.

[0085] By analyzing the movement of ink droplets, it is helpful to analyze the stability of the inkjet process;

[0086] 506. Calculate and process the motion trajectory based on a differential operation method to obtain the speed and direction of the ink droplet;

[0087] Clarify the dynamic characteristics of ink droplets and provide a basis for adjusting inkjet parameters;

[0088] 507. Generate ink droplet characteristics according to the ROI area, ink droplet contour, three-dimensional structure, ink droplet volume, motion trajectory, speed and direction.

[0089] Comprehensive description of ink droplet characteristics by integrating multiple parameters provides detailed information for inkjet system optimization.

[0090] In this embodiment, starting from selecting the ROI area of ​​the fused image, the image recognition algorithm, reverse calculation method, preset parameters and calculation method are gradually used to accurately obtain the characteristics of the ink droplet, such as the contour, three-dimensional structure, volume, motion trajectory, speed and direction. This not only improves the accuracy and comprehensiveness of the analysis of ink droplet characteristics, but also provides a strong basis for the adjustment and optimization of the inkjet system; it can better control the inkjet process, improve the inkjet quality, and reduce product defects caused by unstable ink droplet characteristics, which is of great significance for the application of inkjet technology in the fields of electronic device production.

[0091] A sixth embodiment of an inkjet characteristic measurement method according to an embodiment of the present invention includes:

[0092] 601. Calibrate the internal parameters and external parameters of the camera control unit according to the preset fourth parameter;

[0093] 602. Setting the size of the captured image according to the internal parameters and the external parameters;

[0094] In this embodiment, after the camera calibration is completed, the spatial size corresponding to each pixel in the image is obtained by solving the internal and external parameters; and then the size of the image to be captured is set according to the spatial size corresponding to each pixel;

[0095] 603. When the third working state is that the second stroboscopic operation has been completed, the camera control unit is controlled to capture an inkjet image according to the size.

[0096] By calibrating the internal and external parameters of the camera control unit by presetting the fourth parameter, the relevant parameters of the camera imaging can be accurately determined to improve the image accuracy; then the captured image size is set according to the internal and external parameters, and can be reasonably set based on the corresponding spatial size of the pixel points; finally, when the third working state is met, the inkjet image capture is completed according to the set size, ensuring that the required high-quality inkjet image is obtained, providing a reliable data basis for the subsequent accurate analysis of inkjet characteristics.

[0097] See also Figure 7 A seventh embodiment of an inkjet characteristic measurement method according to an embodiment of the present invention includes:

[0098] 701. Obtain an inkjet instruction through a lower-level industrial computer, shield and capture an interrupt function according to the inkjet instruction, and send the inkjet instruction to a camera device.

[0099] After the lower-level industrial computer obtains the inkjet instruction, it shields the capture interrupt function and sends the instruction to the camera device, which can ensure the accurate transmission of the instruction, avoid interference, and ensure that the inkjet image capture is carried out in an orderly manner.

[0100] The inkjet characteristic measurement method in the embodiment of the present invention is described above. The inkjet characteristic measurement system in the embodiment of the present invention is described below. Figure 8 The inkjet characteristic measurement system includes: a control device 1 and a host industrial computer 2 electrically connected to the control device, a nozzle 3, a nozzle 4, a nozzle driving board 5, a moving platform 6 and a camera device 7; the control device 1 is used to execute the inkjet characteristic measurement method described above.

[0101] Fig. 9 6 is a schematic diagram of the structure of the inkjet characteristic measurement device provided by an embodiment of the present invention. The inkjet characteristic measurement device 600 may have relatively large differences due to different configurations or performances, and may include one or more processors (central processing units, CPU) 613 (for example, one or more processors) and a memory 620, and one or more storage media 630 (for example, one or more mass storage devices) storing application programs 633 or data 632. Among them, the memory 620 and the storage medium 630 can be temporary storage or permanent storage. The program stored in the storage medium 630 may include one or more modules (not shown in the figure), and each module may include a series of instruction operations in the inkjet characteristic measurement device 600. Furthermore, the processor 613 can be configured to communicate with the storage medium 630, and execute a series of instruction operations in the storage medium 630 on the inkjet characteristic measurement device 600 to implement the steps of the inkjet characteristic measurement method provided by the above-mentioned method embodiments.

[0102] The inkjet characteristic measurement device 600 may further include one or more power supplies 640, one or more wired or wireless network interfaces 650, one or more input and output interfaces 660, and / or one or more operating systems 631, such as Windows Serve, Mac OS X, Unix, Linux, FreeBSD, etc. It will be appreciated by those skilled in the art that Fig. 9 The illustrated structure of the inkjet characteristics measurement device does not limit the inkjet characteristics measurement device, and may include more or less components than those illustrated, or may combine certain components, or may have different component arrangements.

[0103] The present invention also provides a computer-readable storage medium, which may be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium. Instructions are stored in the computer-readable storage medium. When the instructions are executed on a computer, the computer executes the steps of the inkjet characteristic measurement method.

[0104] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for measuring inkjet characteristics, characterized in that: include: Applied to an inkjet characteristic measurement system, the inkjet characteristic measurement system comprises: an upper industrial computer, a printhead, a nozzle, a printhead driving board, a motion platform and a camera device, the upper industrial computer is electrically connected to the printhead, the nozzle, the printhead driving board, the motion platform and the camera device, the printhead driving board is electrically connected to the printhead and the nozzle, and the inkjet characteristic measurement method comprises the steps of: The upper industrial computer issues an inkjet command to start the specified nozzle; Obtain inkjet instructions through the nozzle driver board, and drive the nozzle to start inkjet according to the inkjet instructions; Capturing the inkjet instruction through a camera device, and completing the capture of an inkjet image according to the inkjet instruction; Return to execute driving the nozzle through the nozzle driving board to start inkjet until the preset first iteration preset condition is met; then obtain all captured inkjet images, and use the image fusion algorithm to fuse the inkjet images to obtain a fused image; Perform feature recognition on the fused image based on the image recognition method to obtain the ink droplet characteristics; A lateral movement instruction is generated according to the ink droplet characteristics, the lateral movement of the motion stage is controlled according to the lateral movement instruction, and the inkjet instruction for starting the specified nozzle is returned to be executed through the upper industrial computer until the preset second iteration condition is met, all the ink droplet characteristics are obtained, and the inkjet characteristics are generated according to all the ink droplet characteristics.

2. The inkjet characteristic measurement method according to claim 1, characterized in that: include: The camera device includes a camera control unit, a lower industrial computer, a light source driver, a super depth of field lens and a shutter, wherein the camera control unit is electrically connected to the super depth of field lens, the shutter and the lower industrial computer, and the lower industrial computer is electrically connected to the light source driver. The inkjet instruction is captured by the camera device, and an inkjet image is captured according to the inkjet instruction, including: The inkjet instruction is captured by the camera control unit, and the ultra-depth-of-field lens is controlled to work according to the inkjet instruction; Acquire the working state of the super depth of field lens through the camera control unit to obtain a first working state; Analyzing the first working state; When the first working state is that the automatic focus and zoom have been completed, the shutter is controlled to open through the camera control unit; Acquiring the operating state of the shutter through the camera control unit to obtain a second operating state; Analyzing the second working state; When the second working state is that the shutter has been opened, a feedback signal is generated; The feedback signal is captured by the lower-level industrial computer, and the operation of the light source driver is controlled according to the feedback signal; Acquire the working state of the light source driver to obtain a third working state; Analyze the third working state; When the third working state is that the second stroboscopic operation has been completed, the camera control unit completes the capture of an inkjet image.

3. The inkjet characteristic measurement method according to claim 2, characterized in that: include: The method captures the inkjet instruction by a camera and controls the operation of the ultra-depth-of-field lens according to the inkjet instruction, including: Obtain the field of view of the camera control unit, and calculate the coordinates of different nozzles in the printhead based on the field of view and the preset range; The ultra-depth-of-field lens can complete automatic full focus, multi-focus, zoom and focus based on the inkjet signal, coordinates and preset first parameters.

4. The inkjet characteristic measurement method according to claim 2, characterized in that: include: The method of capturing the feedback signal by the lower industrial computer and controlling the operation of the light source driver according to the feedback signal includes: The feedback signal is captured by the lower industrial computer, and the light source driver is controlled to perform the first strobe according to the feedback signal to obtain the first flashing time; Obtaining the stroboscopic characteristics of the light source driver, and calculating the delayed waiting time according to the stroboscopic characteristics and the first flashing time; The light source driver is controlled to perform a second strobe according to the delayed waiting time.

5. The inkjet characteristic measurement method according to claim 1, characterized in that: include: The method of performing feature recognition on the fused image based on the image recognition method to obtain ink droplet characteristics includes: Select the ROI area of ​​the fused image according to the preset second parameter; The ROI area is identified using an image recognition algorithm to obtain the ink droplet outline; The ink droplet profile is estimated based on the reverse estimation method to obtain the three-dimensional structure of the ink droplet; The volume of the ink drop is calculated based on the ink drop profile and the three-dimensional structure; The motion trajectory of the ink drop is obtained by calculating the preset third parameter and the ROI area; The motion trajectory is calculated and processed based on the differential operation method to obtain the speed and direction of the ink droplet; Generate ink droplet characteristics based on ROI area, ink droplet profile, 3D structure, ink droplet volume, motion trajectory, speed and direction.

6. The inkjet characteristic measurement method according to claim 2, characterized in that: include: When the third working state is that the second stroboscopic operation has been completed, the camera is used to capture an inkjet image, including: Calibrate the intrinsic parameters and extrinsic parameters of the camera control unit according to the preset fourth parameter; Set the size of the captured image based on the intrinsic and extrinsic parameters; When the third working state is that the second stroboscopic operation has been completed, the camera control unit is controlled to capture an inkjet image according to the size.

7. The inkjet characteristic measurement method according to claim 2, characterized in that: include: Before the inkjet instruction is captured by the camera device and an inkjet image is captured according to the inkjet instruction, the method includes: The inkjet instruction is obtained through the lower industrial computer, the interrupt function is shielded and captured according to the inkjet instruction, and the inkjet instruction is sent to the camera device.

8. An inkjet characteristic measurement system, characterized in that: The inkjet characteristic measurement system includes: a control device and a host industrial computer electrically connected to the control device, a printhead, a nozzle, a printhead driving board, a motion platform and a camera device; the control device is used to execute the inkjet characteristic measurement method as described in any one of claims 1-7.

9. An inkjet characteristic measuring device, characterized in that: The inkjet characteristic measuring device comprises: a memory and at least one processor, wherein the memory stores instructions; At least one of the processors calls the instructions in the memory to enable the inkjet characteristic measurement device to perform each step of the inkjet characteristic measurement method according to any one of claims 1 to 7.

10. A computer-readable storage medium having instructions stored thereon, characterized in that: When the instructions are executed by a processor, the steps of the inkjet characteristic measurement method according to any one of claims 1 to 7 are implemented.

Images