WO2024055973A1 - Method for controlling ink drop morphology and inkjet printing device - Google Patents

Abstract

Provided are a method for controlling ink drop morphology and an inkjet printing device, the method comprising: a control unit sends a first control signal to an ink supply unit so as to control ink supplied to a nozzle unit (110); according to a first driving signal, the nozzle unit excites the output of an ink drop (120); an imaging unit acquires an image of the ink drop, and sends the image to an image processing unit (130); the image processing unit determines the ink drop morphology according to the image, and sends a first feedback signal to the control unit according to the relationship between the ink drop morphology and preset ink drop morphology (140); and, according to the first feedback signal, the control unit adjusts the first driving signal and/or the first control signal (150). During the inkjet printing process, the method can control the ink drop morphology in real time so as to obtain good ink drop morphology, which helps to ensure the quality of inkjet printing.

Description

Method for controlling ink droplet morphology and inkjet printing device

This application claims priority to the Chinese patent application filed with the China Patent Office on September 13, 2022, with application number 202211091835.3 and the application title "Method for controlling ink droplet morphology and inkjet printing device", the entire content of which is incorporated by reference. in this application.

Technical field

The present application relates to the technical field of inkjet printing, and more specifically, to a method and device for controlling ink droplet morphology.

Background technique

In inkjet printing technology, ink droplet morphology is very important for the print quality of inkjet printing.

Generally speaking, during the inkjet printing process, the properties of the ink itself, such as viscosity, conductivity, etc., will change with changes in the external environment, or impurities in the ink may cause micro-blocking of the nozzles during the printing process. Therefore, It is difficult to ensure a good droplet shape stably for a long time.

Therefore, how to obtain stable and good ink droplet morphology and ensure high-quality inkjet printing has become a technical problem that needs to be solved.

Contents of the invention

Embodiments of the present application provide a method and device for controlling ink droplet morphology. This technical solution can control the ink droplet morphology in real time during the inkjet printing process and obtain good ink droplet morphology, which is conducive to ensuring the quality of inkjet printing. .

A first aspect provides a method for controlling the shape of ink droplets. The method includes: an ink supply unit supplies ink to a nozzle unit according to a first control signal sent by the control unit; and the nozzle unit controls the ink according to a first drive signal sent by the control unit. droplet output; the imaging unit acquires the image of the ink droplet and sends the image to the image processing unit; the image processing unit determines the ink droplet shape of the ink droplet according to the image, and determines the ink droplet shape according to the ink droplet shape and The relationship between the preset ink droplet shapes sends a first feedback signal to the control unit; the control unit adjusts the first drive signal and/or the first control signal according to the first feedback signal.

In the technical solution of the embodiment of the present application, during the inkjet printing process, the imaging unit can image the ink droplets and send the image to the image processing unit. The image processing unit can determine the shape of the ink droplets based on the image and compare it with the preset The shape of the ink droplets is compared to send a feedback signal to the control unit. According to the feedback signal, the control unit can adjust the driving signal sent to the nozzle unit and the control signal sent to the ink supply unit, so that the inkjet printing process can be adjusted in real time. The ink droplet shape ensures the quality of inkjet printing.

In a possible implementation, the ink droplet shape is an ink droplet shape, and sending a first feedback signal to the control unit according to the relationship between the ink droplet shape and the preset ink droplet shape includes: when the ink droplet shape is When the similarity between the ink droplet shape and the image template is less than a first preset similarity, the image processing unit sends the first feedback signal to the control unit. No., the first feedback signal is used by the control unit to adjust the first driving signal and/or the first control signal so that the similarity between the ink droplet shape and the image template is greater than or equal to the first preset similarity. Spend.

In an embodiment of the present application, whether the ink drop meets the requirements can be determined based on the similarity between the ink drop shape in the obtained image of the ink drop and the image template. When the similarity is less than a first preset similarity, a feedback signal can be sent to the control unit so that the control unit adjusts the drive signal and/or control signal, thereby adjusting the shape of the ink drop to make it closer to the image template.

In a possible implementation, the ink droplet shape includes a first shape, the first shape includes the diameter of the ink droplet tail, and the ink droplet shape is determined according to the relationship between the ink droplet shape and the preset ink droplet shape. The control unit sends a first feedback signal, including: when the diameter of the ink droplet tail is less than a first preset value, or greater than a second preset value, the image processing unit sends the first feedback signal to the control unit Signal.

In a possible implementation, the control unit adjusts the first drive signal and/or the first control signal according to the first feedback signal, including: the control unit adjusts the first drive signal and/or the first control signal according to the first feedback signal. The nozzle unit sends a second driving signal, and the second driving signal is used to adjust the temperature of the ink so that the diameter of the ink droplet tail is greater than or equal to the first preset value and less than or equal to the second preset value. .

In the embodiment of the present application, when it is determined that the diameter of the ink droplet tail is outside the preset range, it can be determined that the viscosity of the ink is abnormal, then the image processing unit sends a first feedback signal to the control unit, and the control unit can Send a second drive signal to the nozzle unit to adjust the temperature of the ink and thereby change the viscosity of the ink so that the diameter of the ink droplet tail formed by the nozzle is within the preset range, so that a good ink droplet tail diameter can be obtained. To ensure higher print quality.

In a possible implementation, the control unit adjusts the first control signal according to the first feedback signal, including: the control unit sends a second control signal to the ink supply unit according to the first feedback signal. Control signal, the second control signal is used to adjust the viscosity of the ink so that the diameter of the ink droplet tail is greater than or equal to the first preset value and less than or equal to the second preset value.

In the embodiment of the present application, when it is determined that the diameter of the ink droplet tail is outside the preset range, it can be determined that the viscosity of the ink is abnormal, then the image processing unit sends a first feedback signal to the control unit, and the control unit can Send a second control signal to the ink supply unit to adjust the viscosity of the ink so that the diameter of the ink droplet tail formed by the nozzle is within the preset range, so that a good ink droplet tail diameter can be obtained to ensure a high of print quality.

In a possible implementation, the first form further includes the flight speed of the ink droplet, and the first feedback signal is sent to the control unit according to the relationship between the ink droplet form and the preset ink droplet form. , including: when the flight speed of the ink droplets is less than the first preset speed, or greater than the second preset speed, the image processing unit sends the first feedback signal to the control unit.

In a possible implementation, the method further includes: the control unit sending a third control signal to the ink supply unit according to the first feedback signal, the third control signal being used to adjust the pressure of the ink , so that the flying speed of the ink droplets is greater than or equal to the first preset speed and less than or equal to the second preset speed.

In the embodiment of the present application, when it is determined that the flight speed of the ink droplets is outside the preset range, it can be determined that the pressure of the ink is abnormal, then the image processing unit sends a first feedback signal to the control unit, and the control unit can determine based on the first feedback signal A third control signal is sent to the ink supply unit to adjust the pressure of the ink so that the flight speed of the ink droplets formed by the nozzle is within a preset range, thereby ensuring higher printing quality.

In a possible implementation, the first form further includes the diameter of the main body of the ink droplet, and the The relationship between the ink drop shape and the preset ink drop shape sends a first feedback signal to the control unit, including: when the diameter of the ink drop body is smaller than the third preset value or larger than the fourth preset value, The image processing unit sends the first feedback signal to the control unit.

In a possible implementation, the control unit adjusts the first drive signal and/or the first control signal according to the first feedback signal, including: the control unit adjusts the first drive signal and/or the first control signal according to the first feedback signal. The nozzle unit sends a third driving signal, the third driving signal is used to adjust the diameter of the main body of the ink droplet, so that the diameter of the main body of the ink droplet is greater than or equal to a third preset value and less than or equal to a fourth preset value. default value.

In the embodiment of the present application, the control unit can send a third driving signal to the nozzle unit according to the first feedback signal. The third driving signal can include the adjusted excitation waveform, excitation frequency and excitation amplitude, so that the main body of the ink droplet can be adjusted. The diameter of the ink droplet body is greater than or equal to the third preset value and less than or equal to the fourth preset value, thereby ensuring the quality of inkjet printing.

In a possible implementation, the ink droplet is obtained by breaking an ink line, and the ink droplet shape further includes a second form, and the second form includes the breaking position of the ink line, and the ink droplet shape is determined according to the ink droplet shape. The relationship with the preset ink droplet shape sends a first feedback signal to the control unit, including: when the first distance between the breaking position of the ink line and the nozzle is less than the fifth preset value or greater than the sixth preset value, the The image processing unit sends the first feedback signal to the control unit.

In a possible implementation, the control unit adjusts the first drive signal and/or the first control signal according to the first feedback signal, including: the control unit adjusts the first drive signal and/or the first control signal according to the first feedback signal. The nozzle unit sends a fourth driving signal, the fourth driving signal is used to adjust the temperature of the ink or the signal amplitude of the excitation signal, so that the first distance is greater than or equal to the fifth preset value and less than or equal to the third preset value. Six preset values.

In this embodiment of the present application, the control unit may send a fourth drive signal to the nozzle unit according to the first feedback signal. The fourth drive signal may be used to adjust the temperature of the ink or the signal amplitude of the excitation signal, so that the first distance is within between preset ranges, thereby ensuring the quality of inkjet printing.

In a possible implementation, the second form further includes the deflection of the ink line, and the first feedback signal is sent to the control unit according to the relationship between the ink drop form and the preset ink drop form. , including: when the deflection of the ink line is greater than a seventh preset value, the image processing unit sends the first feedback signal to the control unit.

In a possible implementation, the method further includes: the control unit sending a fourth control signal to the ink supply unit according to the first feedback signal, the fourth control signal being used to control the ink supply unit Clean the nozzle.

This solution can automatically control the ink supply unit to clean the nozzle when the deflection of the ink line deviates from the normal range, thereby improving the intelligence of the inkjet printing device and realizing automatic fault repair.

In a possible implementation, the method further includes: the image processing unit displaying the image in real time.

In an embodiment of the present application, the image processing unit can display the image of ink droplets formed during the inkjet printing process in real time, or display the image of ink droplets formed during the inkjet printing process and the image of preset ink droplets in real time, thereby providing a reference for users and improving user experience.

In a second aspect, an inkjet printing device is provided, including: an ink supply unit configured to supply ink to a nozzle unit according to a first control signal sent by a control unit; and a nozzle unit configured to control the nozzle unit according to a first drive signal sent by the control unit. Ink drop output; the imaging unit is used to obtain the image of the ink drop and send the image to the image processing unit; the image processing unit is used to determine the ink drop shape of the ink drop according to the image, and Send a first feedback signal to the control unit according to the relationship between the ink drop shape and the preset ink drop shape; the control unit is configured to send a first feedback signal according to the first feedback signal. The feedback signal adjusts the first driving signal and/or the first control signal.

In a possible implementation, the ink drop shape is an ink drop shape, and the image processing unit is specifically configured to: when the similarity between the ink drop shape and the image template is less than a first preset similarity, The image processing unit sends the first feedback signal to the control unit, the first feedback signal is used by the control unit to adjust the first drive signal and/or the first control signal so that the ink droplets The similarity between the shape and the image template is greater than or equal to the first preset similarity.

In a possible implementation, the ink droplet shape includes a first shape, the first shape includes the diameter of the ink droplet tail, and the image processing unit is specifically configured to: when the diameter of the ink droplet tail is smaller than the first When a preset value is greater than a second preset value, the image processing unit sends the first feedback signal to the control unit.

In a possible implementation, the control unit is specifically configured to: send a second drive signal to the nozzle unit according to the first feedback signal, where the second drive signal is used to adjust the temperature of the ink, So that the diameter of the ink droplet tail is greater than or equal to the first preset value and less than or equal to the second preset value.

In a possible implementation, the control unit is specifically configured to: send a second control signal to the ink supply unit according to the first feedback signal, where the second control signal is used to adjust the viscosity of the ink. , so that the diameter of the ink droplet tail is greater than or equal to the first preset value and less than or equal to the second preset value.

In a possible implementation, the first form further includes the flying speed of the ink droplets, and the image processing unit is specifically configured to: when the flying speed of the ink droplets is less than the first preset speed, or greater than At the second preset speed, the image processing unit sends the first feedback signal to the control unit.

In a possible implementation, the control unit is further configured to: send a third control signal to the ink supply unit according to the first feedback signal, where the third control signal is used to adjust the pressure of the ink to The flying speed of the ink droplets is greater than or equal to the first preset speed and less than or equal to the second preset speed.

In a possible implementation, the first form further includes the diameter of the main body of the ink droplet, and the image processing unit is specifically configured to: when the diameter of the main body of the ink droplet is smaller than a third preset value, or When it is greater than the fourth preset value, the first feedback signal is sent to the control unit.

In a possible implementation, the control unit is specifically configured to: send a third drive signal to the nozzle unit according to the first feedback signal, where the third drive signal is used to adjust the main body of the ink droplet. The diameter of the ink droplet body is greater than or equal to the third preset value and less than or equal to the fourth preset value.

In a possible implementation, the ink droplets are obtained by breaking ink lines, and the ink droplet shape further includes a second form, and the second form includes the breaking position of the ink line, and the image processing unit is specifically used for : When the first distance between the breaking position of the ink line and the nozzle is less than the fifth preset value or greater than the sixth preset value, the first feedback signal is sent to the control unit.

In a possible implementation, the control unit is specifically configured to: send a fourth drive signal to the nozzle unit according to the first feedback signal, where the fourth drive signal is used to adjust the temperature of the ink. Or the signal amplitude of the excitation signal, such that the first distance is greater than or equal to the fifth preset value and less than or equal to the sixth preset value.

In a possible implementation, the second form further includes a deflection of the ink line, and the image processing unit is specifically configured to: when the deflection of the ink line is greater than a seventh preset value, The control unit sends the first feedback signal.

In a possible implementation, the control unit is further configured to send a fourth control signal to the ink supply unit, where the fourth control signal is used to control the ink supply unit to clean the nozzle.

In a possible implementation, the image processing unit is further configured to display the image in real time.

In a third aspect, a chip is provided. The chip includes a processor and a communication interface. The communication interface is used to receive a signal and transmit the signal to the processor. The processor processes the signal such that The method of controlling ink droplet morphology as described in the first aspect and any possible implementation thereof is performed.

In a fourth aspect, a computer-readable storage medium is provided. Computer instructions are stored in the computer-readable storage medium. When the computer instructions are run on a computer, the implementation of the first aspect and any possible implementation thereof is achieved. The method of controlling ink droplet morphology described in the method is performed.

In a fifth aspect, a computer program product is provided. When the computer program product is run on a computer, it causes the computer to perform the above related steps, so that the ink control method described in the first aspect and any possible implementation thereof is The drop form method is executed.

Description of drawings

FIG. 1 is a schematic flow chart of a method for controlling the shape of ink droplets provided by an embodiment of the present application.

Figure 2 is a schematic diagram of an ink droplet tail shape provided by an embodiment of the present application.

Figure 3 is a schematic diagram of an ink drop shape provided by an embodiment of the present application.

Figure 4 is a schematic block diagram of an inkjet printing device provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

In the field of inkjet printing technology, inkjet printing technology can be mainly divided into two categories. One type is continuous inkjet printer (CIJ) technology that generates ink lines through nozzles and controls the deflection of charged ink droplets. The other type is drop on demand printing technology that controls the opening and closing of multiple nozzle holes. , DOD), DOD can be divided into valve type, thermal foaming type and piezoelectric type.

Under normal circumstances, during the inkjet printing process, the properties of the ink itself, such as viscosity, conductivity, etc., will change with changes in the external environment. At the same time, each printing equipment is not exactly the same, such as differences in nozzle apertures, fluctuations in ink pressure, and even micro-blocking of the nozzles caused by the external environment or impurities in the ink during the printing process, etc., so it is difficult to ensure good results for a long time. The shape of ink droplets or impurities in the ink during the printing process cause micro-blocking of the nozzles, etc.

The size of the ink droplets is smaller, and can reach the micron scale. Its shape may be drop-shaped, pear-shaped, crescent-shaped, etc. The tail may be thick or thin, positive or oblique due to different viscosity, driving frequency, amplitude, waveform, etc. , connected or broken, may have a significant impact on the printing effect, so the shape of the ink droplets needs to be controlled.

In view of this, embodiments of the present application provide a method and an inkjet printing device for controlling ink droplet morphology. This technical solution can control the ink droplet morphology in real time during the inkjet printing process to obtain good ink droplet morphology, which is conducive to ensuring Inkjet printing quality.

Figure 1 is a schematic flow chart of a method for controlling ink droplet morphology provided by an embodiment of the present application. As shown in FIG. 1 , the method 100 may include steps 110 to 150 .

110. The ink supply unit supplies ink to the nozzle unit according to the first control signal sent by the control unit.

It should be understood that ink may be stored in the ink supply unit, and the ink supply unit may supply ink to the nozzle unit according to the first control signal sent by the control unit. The ink supply unit adjusts the pressure of supplying ink, the viscosity of the ink, etc. according to the first control signal.

120. The nozzle unit controls the output of ink droplets according to the first driving signal sent by the control unit.

For example, the nozzle unit may be a nozzle of an inkjet printing device, which may also be called an ink drop generating device, a nozzle module, or the like.

For example, the nozzle unit may be a nozzle unit in the continuous inkjet technology CIJ, or may be a nozzle unit in the drop-on-demand printing technology DOD. When the nozzle unit is a nozzle unit in a CIJ, ink droplets can be ejected from one or more nozzle holes and broken into ink droplets under the excitation of a certain frequency and amplitude signal. When the nozzle unit is a nozzle unit in DOD, the ink droplets can form multiple ink droplets under the excitation of a certain frequency and amplitude signal.

It should be understood that the DOD may be of piezoelectric type, thermal foaming type or valve type.

In some embodiments, the first driving signal can control the excitation signal, including signal frequency, signal waveform, signal amplitude, etc., and the first driving signal can also be used to control the temperature of the nozzle unit, etc.

The nozzle unit can control ink droplet output according to the first driving signal. It should be understood that the ink droplets at this time may have different shapes, and the shape of the obtained ink droplets may be poor, resulting in a decrease in the quality of inkjet printing.

130. The imaging unit obtains the image of the ink droplet and sends the image to the image processing unit.

For example, the imaging unit images the ink droplets ejected from the nozzle, thereby facilitating the inkjet printing device to perform feedback control on the ink droplets.

In some embodiments, the imaging unit can be an imaging device such as a camera, or a discrete component or other device with imaging function. It can be installed outside the nozzle or embedded in the nozzle, and is used to obtain the ink output by the nozzle unit. Drop graphics.

In other embodiments, the imaging unit may also be an imaging system embedded in the nozzle unit. This technical solution will be introduced below with reference to specific embodiments and will not be described in detail here.

140. The image processing unit determines the droplet shape of the ink droplet based on the image, and sends a first feedback signal to the control unit based on the relationship between the ink droplet shape and the preset ink droplet shape.

In one example, the image processing unit may be a computing control unit of an inkjet printing device, and may intelligently analyze and display images sent by the imaging unit.

In another example, the image processing unit may be an edge computing device of an inkjet printing device, and may intelligently analyze and display images sent by the imaging unit.

In another example, the image processing unit can also be a server, for example, it can be a cloud server or a local server, so that the server can intelligently analyze and display the images sent by the imaging unit. For example, the imaging unit can send the image of the ink droplet to the server through wired or wireless means, such as Ethernet network, 4G/5G network, etc.

In some embodiments, the image processing unit can process the image to obtain the ink droplet shape, and the image processing unit can also determine the ink droplet shape according to a deep learning algorithm.

It can be understood that the preset ink drop shape can be a reference value for the ink drop shape or the best ink drop image as a template, and the inkjet printing device can be formed according to the reference value or image template pair during the printing process. Feedback control of ink droplet shape. The preset ink drop shape can be stored in the inkjet printing device as a factory initial setting of the inkjet printing device.

In some embodiments, when there is a large difference between the droplet shape of the ink droplets formed during the inkjet printing process and the preset droplet shape, a first feedback signal may be sent to the control unit, thereby hoping to adjust the ink droplet shape. , to ensure print quality.

150. The control unit adjusts the first driving signal and/or the first control signal according to the first feedback signal.

It should be understood that the control unit can adjust the first driving signal sent to the nozzle unit and/or adjust the first control signal sent to the ink supply unit according to the first feedback signal, thereby controlling the ink droplet shape of the ink droplets formed by the nozzle unit, Make it approach the direction of the preset ink drop shape.

It should be noted that after step 150, the nozzle unit can output ink droplets according to the adjusted first driving signal, so that the ink droplet shape can be controlled in real time and a good ink droplet shape can be obtained.

It should be understood that the method 100 can be applied to an inkjet printing device, such as an inkjet printer. The inkjet printer can include the above-mentioned nozzle unit, imaging unit, image processing unit and control unit; the method 100 can also be applied to inkjet printing. In the system, for example, an inkjet printer includes the above-mentioned nozzle unit, imaging unit, and control unit, and the image processing unit serves as an additional device, which together constitute an inkjet printing system, which is not limited by the embodiments of the present application.

Based on the embodiments of the present application, during the inkjet printing process, the imaging unit can image the ink droplets and send the image to the image processing unit. The image processing unit can determine the ink droplet shape based on the image and compare it with the preset ink droplet shape. Comparison is performed to send a feedback signal to the control unit. According to the feedback signal, the control unit can adjust the excitation signal sent to the nozzle unit and/or send a viscosity control signal to the ink supply unit, so that the ink during the inkjet printing process can be adjusted in real time. Drop shape ensures the quality of inkjet printing.

Optionally, the ink drop shape includes a first shape, the first shape includes the diameter of the ink drop tail, and sending a first feedback signal to the control unit according to the relationship between the ink drop shape and the preset ink drop shape includes:

When the diameter of the ink droplet tail is smaller than the first preset value or larger than the second preset value, the image processing unit sends a first feedback signal to the control unit.

It should be understood that when the ink droplet shape includes the diameter of the ink droplet tail, the preset ink droplet shape is the preset diameter of the ink droplet tail.

For example, if the preset diameter is n, then the first preset value may be 0.9n, and the second preset value may be 1.1n, that is, when the diameter of the ink droplet tail is outside ±10% of the preset diameter, It can be considered that the ink droplet shape is poor and will affect the quality of inkjet printing. At this time, the image processing unit can send a first feedback signal to the control unit in order to adjust the diameter of the ink droplet tail.

In some embodiments, the first form may also include the thickness, skew, discontinuity, etc. of the ink droplet tail, and may also be the shape of the ink droplet main body.

In some embodiments, in addition to comparing the morphological characteristics with specific preset values, the morphological characteristics in this method can also be compared with the image template of the optimal ink droplet.

Optionally, the ink drop shape is an ink drop shape, and the first feedback signal is sent to the control unit according to the relationship between the ink drop shape and the preset ink drop shape, including:

When the similarity between the ink drop shape and the image template is less than the first preset similarity, the image processing unit sends a first feedback signal to the control unit, and the first feedback signal is used by the control unit to adjust the first driving signal and/or the first control signal, so that the similarity between the ink drop shape and the image template is greater than or equal to the first preset similarity.

For example, the first preset similarity may be 80%, 85%, etc., and the embodiment of the present application does not limit the specific value of the first preset similarity.

In the embodiment of the present application, whether the ink droplet meets the requirements can be determined based on the similarity between the ink droplet shape in the obtained ink droplet image and the image template. When the similarity is less than the first preset similarity, the control can be configured to The unit sends a feedback signal, so that the control unit adjusts the driving signal and/or the control signal, thereby adjusting the shape of the ink droplet to make it closer to the image template.

Optionally, the control unit adjusts the first driving signal and/or the first control signal according to the first feedback signal, including:

The control unit sends a second drive signal to the nozzle unit according to the first feedback signal. The second drive signal is used to adjust the temperature of the ink so that the diameter of the ink droplet tail is greater than or equal to the first preset value and less than or equal to the second preset value. value.

Optionally, the control unit adjusts the first control signal according to the first feedback signal, including:

The control unit sends a second control signal to the ink supply unit according to the first feedback signal. The second control signal is used to adjust the viscosity of the ink so that the diameter of the tail of the ink droplet is greater than or equal to the first preset value and less than or equal to the second preset value. Set value.

It can be understood that the diameter of the ink droplet tail is related to the viscosity of the ink. The lower the viscosity of the ink, the larger the diameter of the formed ink droplet tail until it breaks and forms a satellite point. For example, when the diameter of the ink droplet tail is within ±10% or ±5% of the preset diameter, it can be determined that the viscosity of the ink is within the normal range; otherwise, it can be determined that the viscosity of the ink is abnormal.

For example, see FIG. 2 , which is a schematic diagram of the shape of an ink droplet tail provided by an embodiment of the present application. As shown in Figure 2, the diameter of the ink droplet tail formed during inkjet printing is related to the viscosity of the ink. When the viscosity of the ink is low, the diameter of the tail of the ink droplet is smaller, such as the tail of the ink droplet 7; when the viscosity of the ink is high, the diameter of the tail of the ink droplet is larger, such as the tail of the ink droplet 8, until the tail of the ink droplet is broken, such as the tail of the ink droplet. Drop tail 9.

In some embodiments, when the diameter of the ink droplet tail is smaller than the first preset value, or larger than the second preset value, the control unit may send a second driving signal to the nozzle unit according to the first feedback signal, and the second driving signal The signal is used to adjust the temperature of the ink so that the diameter of the tail of the ink droplet is greater than or equal to the first preset value and less than or equal to the second preset value.

In a possible implementation, if the diameter of the ink droplet tail is smaller than the first preset value, it can be determined that the viscosity of the ink is high and exceeds the normal range, so that the diameter of the formed ink droplet tail is smaller. At this time, the image processing unit may send a first feedback signal to the control unit, and the first feedback signal may be used to indicate that the diameter of the tail of the ink droplet is smaller than a normal range, or the first feedback signal may indicate that the viscosity of the ink is higher. After receiving the first feedback signal, the control unit can send a second drive signal to the nozzle unit. The second drive signal can be used to instruct the nozzle unit to increase the ink temperature, thereby reducing the viscosity of the ink to a normal range. within.

In some embodiments, when the diameter of the ink droplet tail is smaller than the first preset value, or larger than the second preset value, the control unit may send a second driving signal to the nozzle unit according to the first feedback signal, and the second driving signal The signal is used to adjust the temperature of the ink so that the diameter of the tail of the ink droplet is greater than or equal to the first preset value and less than or equal to the second preset value.

In a possible implementation, if the diameter of the ink droplet tail is smaller than the first preset value, it can be determined that the viscosity of the ink is high and exceeds the normal range, so that the diameter of the formed ink droplet tail is smaller. At this time, the image processing unit may send a first feedback signal to the control unit, and the first feedback signal may be used to indicate that the diameter of the tail of the ink droplet is smaller than a normal range, or the first feedback signal may indicate that the viscosity of the ink is higher. After receiving the first feedback signal, the control unit can send a second control signal to the ink supply unit. The second control signal can be used to instruct the ink supply unit to reduce the viscosity of the ink so that it is within a normal range. It should be understood that if the difference between the diameter of the ink droplet tail and the first preset value is large, one feedback will cause insufficient adjustment, and then the above process can be performed multiple times until the ink droplet is within the normal range. within.

Alternatively, the control unit can determine the difference between the diameter of the ink droplet tail and the first preset value based on the feedback signal, and then send a second drive signal or a second control signal to the nozzle unit. The second drive or control signal can make Obtain ink with appropriate viscosity at the nozzle so that the diameter of the ink droplet tail formed after adjustment is within the normal range.

Alternatively, the control unit may store a mapping relationship between the diameter of the ink droplet tail and the ink temperature. When the difference between the diameter of the ink droplet tail and the first preset value is determined, a second value may be sent to the nozzle unit. The second driving signal can instruct the nozzle unit to adjust the ink temperature to the target value so that the tail of the ink droplet formed subsequently is The diameter may be greater than or equal to the first preset value and less than or equal to the second preset value.

Alternatively, the control unit may store a mapping relationship between the diameter of the ink droplet tail and the ink viscosity. When the difference between the diameter of the ink droplet tail and the first preset value is determined, a third value may be sent to the ink supply unit. Two control signals, the second control signal can instruct the nozzle unit to adjust the ink viscosity to the target value, so that the diameter of the ink drop tail formed subsequently can be greater than or equal to the first preset value and less than or equal to the second preset value.

It should be understood that the mapping relationship between the diameter of the ink droplet tail and the ink viscosity or temperature may be different for different inkjet printing technologies.

In another possible implementation, if the diameter of the ink droplet tail is greater than the second preset value, it can be determined that the viscosity of the ink is low and exceeds the normal range, so that the diameter of the formed ink droplet tail is larger. At this time, the image processing unit may send a first feedback signal to the control unit, and the first feedback signal may be used to indicate that the diameter of the tail of the ink droplet is larger than a normal range, or the first feedback signal may indicate that the viscosity of the ink is lower. After receiving the first feedback signal, the control unit can send a second drive signal to the nozzle unit. The second drive signal can be used to instruct the nozzle unit to reduce the temperature of the ink to increase the viscosity of the ink so that it is within a normal range. Inside.

Alternatively, the control unit can determine the difference between the diameter of the ink droplet tail and the second preset value based on the feedback signal, and then send a second drive signal to the nozzle unit. The second drive signal can enable the nozzle to accurately adjust the temperature of the ink to Reach the appropriate viscosity so that the diameter of the ink droplet tail formed after adjustment is within the normal range.

Alternatively, the control unit may store a mapping relationship between the diameter of the ink droplet tail and the ink temperature. When the difference between the diameter of the ink droplet tail and the second preset value is determined, a second value may be sent to the nozzle unit. The driving signal, the second driving signal can instruct the nozzle unit to adjust the ink temperature to the target value, and the viscosity changes with the temperature, so that the diameter of the ink droplet tail formed subsequently can be greater than or equal to the first preset value and less than or equal to the second default value.

In another possible implementation, if the diameter of the ink droplet tail is greater than the second preset value, it can be determined that the viscosity of the ink is low and exceeds the normal range, so that the diameter of the formed ink droplet tail is larger. At this time, the image processing unit may send a first feedback signal to the control unit, and the first feedback signal may be used to indicate that the diameter of the tail of the ink droplet is larger than a normal range, or the first feedback signal may indicate that the viscosity of the ink is lower. After receiving the first feedback signal, the control unit may send a second control signal to the control unit. The second control signal may be used to instruct the control unit to increase the viscosity of the ink so that it is within a normal range.

Alternatively, the control unit can determine the difference between the diameter of the ink droplet tail and the second preset value based on the feedback signal, and then send a second control signal to the nozzle unit. The second control signal can enable the nozzle to accurately adjust the viscosity of the ink, Make sure that the diameter of the ink droplet tail formed after adjustment is within the normal range.

Alternatively, the control unit may store a mapping relationship between the diameter of the ink droplet tail and the ink viscosity. When the difference between the diameter of the ink droplet tail and the second preset value is determined, a second value may be sent to the nozzle unit. The second control signal may instruct the ink supply unit to adjust the ink temperature to the target viscosity so that the diameter of the ink droplet tail formed thereafter may be greater than or equal to the first preset value and less than or equal to the second preset value.

In some embodiments, the second drive signal may be used to adjust the temperature of the ink, thereby adjusting the viscosity of the ink. For example, when the temperature of the nozzle unit increases, the temperature of the ink will increase, which can reduce the viscosity of the ink; when the temperature of the nozzle unit decreases, the temperature of the ink will decrease, which can increase the viscosity of the ink.

In other embodiments, the control unit may control the ink supply unit to increase or decrease the diluent to adjust the viscosity of the ink. For example, when increasing the diluent, the viscosity of the ink can be reduced; when decreasing the diluent, the viscosity of the ink can be increased.

In this technical solution, when it is determined that the diameter of the ink droplet tail is outside the preset range, it can be determined that the viscosity of the ink is abnormal, then the image processing unit sends a first feedback signal to the control unit, and the control unit can send a signal to the control unit based on the first feedback signal. The nozzle unit sends a second drive signal to adjust the temperature of the ink and thereby change the viscosity, so that the diameter of the ink droplet tail formed by the nozzle is within the preset range, so that a good ink droplet tail diameter can be obtained to ensure a longer High print quality.

In this technical solution, when it is determined that the diameter of the ink droplet tail is outside the preset range, it can be determined that the viscosity of the ink is abnormal, then the image processing unit sends a first feedback signal to the control unit, and the control unit can send a signal to the control unit based on the first feedback signal. The ink supply unit sends a second control signal to adjust the viscosity of the ink so that the diameter of the ink droplet tail formed by the nozzle is within the preset range, so that a good ink droplet tail diameter can be obtained to ensure a higher Print quality.

Optionally, the first form also includes the flying speed of the ink droplets, and sending a first feedback signal to the control unit according to the relationship between the ink droplet form and the preset ink droplet form includes:

When the flying speed of the ink droplets is less than the first preset speed or greater than the second preset speed, the image processing unit sends a first feedback signal to the control unit.

It should be understood that the first form may also include the flying speed of the ink droplets, and the flying speed may be determined by dividing the distance between two adjacent ink droplets by the time period for forming the ink droplets.

It should be understood that when the viscosity of the ink remains constant, the flight speed of the ink droplets can be positively correlated with the pressure of the ink.

For example, the ink droplet speed using CIJ technology is usually 20m/s-30m/s, then the first preset speed may be 20m/s, and the second preset speed may be 30m/s. The ink droplet speed using DOD technology is usually less than or equal to 5m/s, then the first preset speed may be 4m/s, and the second preset speed may be 5m/s. The first preset speed and the second preset speed can also be other values, which are not limited by the embodiments of this application.

During the inkjet printing process, when the flying speed of the ink droplets is less than the first preset speed or greater than the second preset speed, it means that the ink pressure is abnormal, and the image processing unit sends a first feedback signal to the control unit in order to adjust The flight speed of the ink droplets.

The first feedback signal may include indication information indicating abnormal ink pressure, or the first feedback signal may include indication information indicating the control unit to adjust the ink pressure.

Optionally, the method may also include:

The control unit sends a third control signal to the ink supply unit according to the first feedback signal. The third control signal is used to adjust the pressure of the ink so that the flying speed of the ink droplets is greater than or equal to the first preset speed and less than or equal to the second preset speed. Set speed.

After receiving the first feedback signal, the control unit determines that the pressure of the ink needs to be adjusted, and then adjusts the flying speed of the ink droplets. Therefore, the control unit can send a third control signal to the ink supply unit, and the third control signal is used to control the ink supply unit to adjust the pressure of the ink so that the flight speed of the ink droplets is within a preset range.

In a possible implementation, when the flying speed of the ink droplets is less than the first preset speed, the first control signal can be used to increase the pressure of the ink to achieve the effect of increasing the flying speed of the ink droplets until the ink droplet flying speed is lower than the first preset speed. The flying speed of the drop is within the preset range.

In another possible implementation, when the flying speed of the ink droplets is greater than the second preset speed, the first control signal can be used to reduce the pressure of the ink to achieve the effect of reducing the flying speed of the ink droplets until The flying speed of the ink droplet is within the preset range.

For example, see FIG. 3 , which is a schematic diagram of an ink droplet form provided by an embodiment of the present application. As shown in Figure 3 As shown in the figure, the nozzle unit ejects ink from the nozzle 1 under the action of the excitation signal 10. The ink first forms an ink line 2, and then breaks at the break position 3 to form discrete ink droplets.

The flight speed of the ink droplets can be obtained by dividing the distance 6 between two adjacent ink droplets by the period of the excitation signal 10 .

In this technical solution, when it is determined that the flight speed of the ink droplets is outside the preset range, it can be determined that the pressure of the ink is abnormal, then the image processing unit sends a first feedback signal to the control unit, and the control unit can send a first feedback signal to the control unit based on the first feedback signal. The ink supply unit sends a third control signal to adjust the pressure of the ink so that the flight speed of the ink droplets formed by the nozzle is within a preset range, thereby ensuring high printing quality.

Optionally, the first form also includes the diameter of the main body of the ink droplet, and sending a first feedback signal to the control unit according to the relationship between the ink droplet form and the preset ink droplet form includes:

When the diameter of the main body of the ink drop is smaller than the third preset value or larger than the fourth preset value, the image processing unit sends a first feedback signal to the control unit.

It should be understood that during the inkjet printing process, the diameter of the main body of the ink droplet may be affected by the waveform, frequency and amplitude of the excitation signal of the nozzle hole of the nozzle unit.

For example, when CIJ technology is used, the driving frequency is generally between 40khz and 120khz, and the maximum driving amplitude can reach 300v. When DOD technology is used, the driving frequency is generally between 20khz and 40khz, and the driving amplitude is generally less than 80v. Therefore, using different inkjet printing technologies, the diameter of the preset main body of the ink droplets is different.

For example, when the diameter of the preset ink droplet body is m, the third preset value may be 0.95m, and the fourth preset value may be 1.05m, that is, the diameter of the ink droplet body formed during inkjet printing. When the diameter is within ±5% of the diameter of the preset ink drop body, it can be determined that the diameter of the ink drop body is normal; otherwise, it can be determined that the diameter of the ink drop body is abnormal.

Referring to Figure 3, during the inkjet printing process, the diameter of the ink droplet body 4 can be obtained and compared with the third preset value and the fourth preset value to determine whether the diameter of the ink droplet body 4 is within the preset range. Inside.

In other embodiments, the third preset value can also be 0.9m, and the fourth preset value can also be 1.1m, that is, the diameter of the ink droplet body formed during the inkjet printing process is within the preset ink droplet body diameter. When the diameter is within ±10% of the diameter, it can be determined that the diameter of the ink droplet body is normal; otherwise, it can be determined that the diameter of the ink droplet body is abnormal. It should be understood that the third preset value and the fourth preset value can also be other values, and the embodiments of the present application are not limited to the specific values.

In the embodiment of the present application, when the diameter of the main body of the ink drop is smaller than the third preset value or larger than the fourth preset value, it means that the diameter of the main body of the ink drop is abnormal, which may affect the quality of inkjet printing. At this time, the image processing unit may send the first feedback signal to the control unit.

The first feedback signal may include instruction information indicating abnormalities in the excitation signal waveform, frequency, and amplitude, or the first feedback signal may include instructions for instructing the control unit to adjust the excitation waveform, excitation frequency, and excitation amplitude. information.

In some embodiments, the first morphology may also include the roundness of the body of the ink droplet. For the method of judging the roundness of the ink drop body, please refer to the above related description of the diameter of the ink drop body, which will not be described again for the sake of brevity.

Optionally, the control unit adjusts the first driving signal and/or the first control signal according to the first feedback signal, including:

The control unit sends a third driving signal to the nozzle unit according to the first feedback signal. The third driving signal is used to adjust the diameter of the main body of the ink droplet, so that the diameter of the main body of the ink droplet is greater than or equal to the third preset value and less than or equal to the third preset value. Four presets.

In a possible implementation, when the diameter of the main body of the ink droplet is smaller than the third preset value, it can be determined that the ink droplet has If the diameter of the main body of the ink drop is smaller, the third driving signal can be used to control the nozzle unit to increase the diameter of the main body of the ink drop until the diameter of the main body of the ink drop is greater than or equal to the third preset value and less than or equal to the fourth preset value. default value.

In another possible implementation, when the diameter of the main body of the ink drop is greater than the fourth preset value, it can be determined that the diameter of the main body of the ink drop is larger, and then the third driving signal can be used to control the reduction of the nozzle unit. The diameter of the main body of the small ink droplet is until the diameter of the main body of the ink droplet is greater than or equal to the third preset value and less than or equal to the fourth preset value.

In the embodiment of the present application, the control unit can send a third driving signal to the nozzle unit according to the first feedback signal. The third driving signal can include the adjusted excitation waveform, excitation frequency and excitation amplitude, so that the main body of the ink droplet can be adjusted. The diameter of the ink droplet body is greater than or equal to the third preset value and less than or equal to the fourth preset value, thereby ensuring the quality of inkjet printing.

Optionally, the ink droplets are obtained by breaking the ink line. The ink droplet shape also includes a second form. The second form includes the breaking position of the ink line. The first feedback signal is sent to the control unit according to the relationship between the ink droplet shape and the preset ink droplet shape. ,include:

When the first distance between the breaking position of the ink line and the nozzle is less than the fifth preset value or greater than the sixth preset value, the image processing unit sends a first feedback signal to the control unit.

It should be understood that during the inkjet printing process, ink is ejected from the nozzle holes of the nozzle unit, and first forms a continuous ink line without separation, and then breaks into separate ink droplets. The length of the ink line can be related to the viscosity of the ink. The higher the viscosity of the ink, the longer the length of the ink line.

For example, referring to FIG. 3 , ink is ejected from the nozzle hole 1 , and a series of ink droplets form an ink line 2 . Under the action of the excitation signal 10 , the ink line breaks at position 3 . When the viscosity of the ink is higher, the break position 3 is further away from the first distance between the nozzle holes; when the viscosity of the ink is lower, the break position 3 is closer to the first distance between the nozzle holes.

In some embodiments, the first distance between the breaking position 3 and the nozzle hole may also be related to the driving amplitude. The smaller the amplitude of the driving signal, the farther the first distance between the breaking position 3 and the nozzle hole; the greater the amplitude of the driving signal, the closer the first distance between the breaking position 3 and the nozzle hole.

It should be understood that the inkjet printing device may store a preset first distance value L, the fifth preset value may be 0.9L, 0.95L, etc., and the sixth preset value may be 1.05L, 1.1L, etc. . The embodiment of the present application does not limit the specific value L of the preset first distance.

For example, when the first distance is less than the fifth preset value, it means that the breaking position 3 is closer to the nozzle hole. This may be because the viscosity of the ink is low, or the signal amplitude of the driving signal is large and needs to be adjusted. At this time, the image processing unit may send the first feedback signal to the control unit.

For example, when the first distance is greater than the sixth preset value, it means that the breaking position 3 is far away from the nozzle hole. This may be because the viscosity of the ink is high or the signal amplitude of the driving signal is small and needs to be adjusted. At this time, the image processing unit may send the first feedback signal to the control unit.

The first feedback signal may include indication information indicating abnormal ink viscosity, or the first feedback signal may include indication information indicating the control unit to adjust the ink viscosity.

Optionally, the control unit adjusts the first driving signal and/or the first control signal according to the first feedback signal, including:

The control unit sends a fourth drive signal to the nozzle unit according to the first feedback signal. The fourth drive signal is used to adjust the viscosity (temperature) of the ink or the signal amplitude of the drive signal so that the first distance is greater than or equal to the fifth preset value and Less than or equal to the sixth preset value.

Alternatively, the control unit sends a second control signal to the ink supply unit according to the first feedback signal, and the second control signal is used to adjust the viscosity of the ink so that the first distance is greater than or equal to the fifth preset value and less than or equal to the sixth preset value. Set value.

In a possible implementation, when the first distance is less than the fifth preset value, the control unit may send a fourth drive signal to the nozzle unit according to the first feedback signal, the fourth excitation signal being used to reduce the signal of the drive signal The amplitude may be used to increase the viscosity of the ink (lower the temperature), so that the first distance is greater than or equal to the fifth preset value and less than or equal to the sixth preset value.

In another possible implementation, when the first distance is greater than the sixth preset value, the control unit may send a fourth excitation signal to the nozzle unit according to the first feedback signal, and the fourth excitation signal is used to increase the driving signal. The signal amplitude is either used to reduce the viscosity of the ink (increase the temperature), so that the first distance is greater than or equal to the fifth preset value and less than or equal to the sixth preset value.

In another possible implementation, when the first distance is greater than the sixth preset value, the control unit may send a second control signal to the nozzle unit according to the first feedback signal, and the second control signal is used to reduce the viscosity of the ink. , so that the first distance is greater than or equal to the fifth preset value and less than or equal to the sixth preset value.

In some embodiments, the control unit may store a mapping relationship between the ink viscosity and the first distance, or a mapping relationship between the signal amplitude of the driving signal and the first distance, so that the control unit can determine the amount of adjustment based on the mapping relationship.

In this embodiment of the present application, the control unit may send a fourth driving signal to the nozzle unit according to the first feedback signal. The fourth driving signal may be used to adjust the temperature (viscosity) of the ink or the signal amplitude of the excitation signal, so that the third driving signal A distance is between the preset range, thereby ensuring the quality of inkjet printing.

Alternatively, the control unit can send a second control signal to the ink supply unit according to the first feedback signal. The second control signal can be used to adjust the viscosity of the ink so that the first distance is between the preset range, thereby ensuring that the inkjet Ink printing quality.

Optionally, the second form also includes the deflection of the ink line, and sends a first feedback signal to the control unit according to the relationship between the ink drop form and the preset ink drop form, including:

When the deflection of the ink line is greater than the seventh preset value, the image processing unit sends a first feedback signal to the control unit.

It should be understood that during the inkjet printing process, when the nozzle holes are blocked or foreign objects are present, the ink lines formed will deviate from the normal position, causing the ink lines to deviate, which will affect the quality of inkjet printing.

For example, the normal position of the ink line is within an angle of plus or minus a seventh preset value from the reference line, for example, the seventh preset value is 5 degrees, 3 degrees, etc.

When the deflection of the ink line is greater than the seventh preset value, it means that the ink line deviates more from the normal position. At this time, the deflection of the ink line needs to be adjusted, and the image processing unit can send a first feedback signal to the control unit. , the first feedback signal can be used to indicate abnormal deflection of the ink line.

Optionally, the method 100 may also include:

The control unit sends a fourth control signal to the ink supply unit according to the first feedback signal, and the fourth control signal is used to control the ink supply unit to clean the nozzle.

For example, after receiving the first feedback signal, the control unit can send a fourth control signal to the ink supply unit. The fourth control signal can be used to control the ink supply unit to clean the nozzle so that the deflection of the ink line is normal. scope.

Based on the embodiments of the present application, when the deflection of the ink line deviates from the normal range, the ink supply unit can be automatically controlled to clean the nozzle, thereby improving the intelligence of the inkjet printing device and realizing automatic fault repair.

Optionally, the method 100 may also include:

The image processing unit displays images of ink droplets in real time.

In some embodiments, the image processing unit can also display the image of the ink droplet and the image of the preset ink droplet in real time. Alternatively, the image processing unit can also display the image of the ink droplet and the image template in real time.

In the embodiment of the present application, the image processing unit can display the image of the ink droplets formed during the inkjet printing process in real time, or display the image of the ink droplets formed during the inkjet printing process and the image of the preset ink droplets in real time, so that it can provide Provide users with references to improve user experience.

Figure 4 is a schematic diagram of an inkjet printing device provided by an embodiment of the present application. As shown in FIG. 4 , the inkjet printing device 200 may include a nozzle unit 210 , an imaging unit 220 , an image processing unit 230 , a control unit 240 and an ink supply unit 250 .

The ink supply unit 250 is used to provide ink to the nozzle unit 210 . In some embodiments, the ink supply unit 250 and the nozzle unit 210 may be integrated into a functional unit, which is not limited by the embodiments of this application.

The nozzle unit 210 is used to control the output of ink droplets according to the first driving signal sent by the control unit 240 .

The imaging unit 220 is used to acquire images of ink droplets and send the images to the image processing unit 230 .

The image processing unit 230 is configured to determine the droplet shape of the ink droplet based on the image of the ink droplet, and send a first feedback signal to the control unit 240 based on the relationship between the ink droplet shape and the preset ink droplet shape.

The control unit 240 is used to adjust the first driving signal and/or the first control information according to the first feedback signal.

Optionally, the ink droplet shape includes a first shape, and the first shape includes the diameter of the ink droplet tail, and the image processing unit 230 is specifically used to:

When the diameter of the ink droplet tail is smaller than the first preset value or larger than the second preset value, the image processing unit 230 sends a first feedback signal to the control unit 240 .

Optionally, the control unit 240 is specifically used for:

A second driving signal is sent to the nozzle unit 210 according to the first feedback signal. The second driving signal is used to adjust the temperature of the ink, thereby changing the viscosity of the ink, so that the diameter of the tail of the ink droplet is greater than or equal to the first preset value and less than or equal to the first preset value. equal to the second preset value.

Alternatively, a second control signal is sent to the ink supply unit 250 according to the first feedback signal. The second control signal is used to adjust the viscosity of the ink so that the diameter of the ink droplet tail is greater than or equal to the first preset value and less than or equal to the second preset value. default value.

Alternatively, a second driving signal is sent to the nozzle unit 210 and a second control signal is sent to the ink supply unit 250 according to the first feedback signal, so that the diameter of the ink droplet tail is greater than or equal to the first preset value and less than or equal to the second preset value. Set value.

Optionally, the first form also includes the flight speed of the ink droplets, and the image processing unit 230 is specifically configured to:

When the flying speed of the ink droplets is less than the first preset speed, or greater than the second preset speed, the image processing unit 230 sends a first feedback signal to the control unit 240 .

Optionally, the control unit 240 is also used for:

A first control signal is sent to the ink supply unit 250 according to the first feedback signal, and the third control signal is used to adjust the pressure of the ink so that the flying speed of the ink droplets is greater than or equal to the first preset speed and less than or equal to the second preset speed. speed.

Optionally, the first form also includes the diameter of the main body of the ink droplet, and the image processing unit 230 is specifically used to:

When the diameter of the main body of the ink drop is smaller than the third preset value or larger than the fourth preset value, a first feedback signal is sent to the control unit 240 .

Optionally, the control unit 240 is specifically used for:

A third driving signal is sent to the nozzle unit 210 according to the first feedback signal. The third driving signal is used to adjust the diameter of the main body of the ink droplet, so that the diameter of the main body of the ink droplet is greater than or equal to the third preset value and less than or equal to the fourth preset value. default value.

Optionally, the ink droplets are obtained by breaking the ink line. The ink droplet shape also includes a second form. The second form includes the breaking position of the ink line. The image processing unit 230 is specifically used to:

When the first distance between the breaking position of the ink line and the nozzle is less than the fifth preset value or greater than the sixth preset value, a first feedback signal is sent to the control unit 240 .

Optionally, the control unit 240 is specifically used for:

A fourth driving signal is sent to the nozzle unit 210 according to the first feedback signal. The fourth driving signal is used to adjust the temperature (viscosity) of the ink or the signal amplitude of the excitation signal, so that the first distance is greater than or equal to the fifth preset value and less than Or equal to the sixth preset value.

A second control signal is sent to the ink supply unit 250 according to the first feedback signal, and the second control signal is used to adjust the viscosity of the ink so that the first distance is greater than or equal to the fifth preset value and less than or equal to the sixth preset value.

Optionally, the second form also includes the deflection of the ink line, and the image processing unit 230 is specifically used to:

When the deflection of the ink line is greater than the seventh preset value, a first feedback signal is sent to the control unit 240 .

Optionally, the control unit 240 is also used for:

A fourth control signal is sent to the ink supply unit 250, and the fourth control signal is used to control the ink supply unit 250 to clean the nozzle.

In some embodiments, referring to FIG. 4 , the nozzle unit 210 is supplied with ink by the ink supply unit 250 through the pipeline 6 , and the control unit 240 controls components such as pumps or valves in the ink supply unit 250 through the ink path control bus 7 to achieve ink supply. supply, cleaning of the nozzle and provision and maintenance of positive or negative pressure, as well as ink viscosity supplied to the nozzle unit 210 . The control unit 240 provides an excitation signal to one or more nozzles in the nozzle unit 210 through the drive bus 8, and can adjust the excitation frequency, waveform, amplitude, etc., and can also control the temperature of the nozzle. The imaging unit 220 can convert the ink droplets ejected from the nozzles into image signals through the imaging optical path, and then transmit the image signals to the image processing unit 230 through the image data bus 9 . The image processing unit 230 feeds back the results or instructions to the control unit through the feedback bus 10 according to the relationship between the image of the ink droplet and the preset shape of the ink droplet, thereby completing real-time control of the shape of the ink droplet, so that the inkjet printing process can be obtained Good ink droplet shape ensures the quality of inkjet printing.

An embodiment of the present application also provides a chip. The chip includes a processor and a communication interface. The communication interface is used to receive signals and transmit the signals to the processor. The processor processes the signals. This causes the method of controlling the ink droplet shape as described in any of the previous possible implementations to be executed.

Embodiments of the present application also provide a computer-readable storage medium. Computer instructions are stored in the computer-readable storage medium. When the computer instructions are run on a computer, the method for controlling the shape of ink droplets in the above embodiment is executed. .

An embodiment of the present application also provides a computer program product. When the computer program product is run on a computer, it causes the computer to perform the above related steps, so that the method for controlling the shape of the ink droplets in the above embodiment is executed.

Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each specific application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be described again here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit.

If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program code. .

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of various equivalent methods within the technical scope disclosed in the present application. Modification or replacement, these modifications or replacements shall be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims (30)

1. A method for controlling the shape of ink droplets, characterized by including:

   The ink supply unit supplies ink to the nozzle unit according to the first control signal sent by the control unit;

   The nozzle unit controls the ink droplet output according to the first driving signal sent by the control unit;

   The imaging unit acquires an image of the ink droplet and sends the image to the image processing unit;

   The image processing unit determines the ink droplet shape of the ink droplet based on the image, and sends a first feedback signal to the control unit based on the relationship between the ink droplet shape and the preset ink droplet shape;

   The control unit adjusts the first driving signal and/or the first control signal according to the first feedback signal.
2. The method according to claim 1, wherein the ink droplet shape is an ink droplet shape, and the first feedback signal is sent to the control unit according to the relationship between the ink droplet shape and the preset ink droplet shape, include:

   When the similarity between the ink drop shape and the image template is less than a first preset similarity, the image processing unit sends the first feedback signal to the control unit, and the first feedback signal is used for the control The unit adjusts the first driving signal and/or the first control signal so that the similarity between the ink drop shape and the image template is greater than or equal to a first preset similarity.
3. The method according to claim 1, wherein the ink droplet shape includes a first shape, the first shape includes the diameter of the ink droplet tail, and the ink droplet shape according to the ink droplet shape and the preset ink droplet shape. The relationship sends a first feedback signal to the control unit, including:

   When the diameter of the ink droplet tail is less than the first preset value or greater than the second preset value, the image processing unit sends the first feedback signal to the control unit.
4. The method of claim 3, wherein the control unit adjusts the first driving signal and/or the first control signal according to the first feedback signal, including:

   The control unit sends a second driving signal to the nozzle unit according to the first feedback signal, and the second driving signal is used to adjust the temperature of the ink so that the diameter of the ink droplet tail is greater than or equal to a third A preset value and less than or equal to the second preset value, or the shape of the tail of the ink droplet.
5. The method according to claim 3 or 4, characterized in that the control unit adjusts the first driving signal and/or the first control signal according to the first feedback signal, including:

   The control unit sends a second control signal to the nozzle unit according to the first feedback signal. The second control signal is used to adjust the viscosity of the ink so that the diameter of the ink droplet tail is greater than or equal to the first A preset value is less than or equal to the second preset value or close to the image template.
6. The method according to any one of claims 3 to 5, characterized in that the first form further includes the flying speed of the ink droplet, and the said ink droplet form is based on the relationship between the ink droplet form and the preset ink droplet form. Sending a first feedback signal to the control unit includes:

   When the flight speed of the ink droplets is less than the first preset speed, or greater than the second preset speed, the image processing unit sends the first feedback signal to the control unit.
7. The method of claim 6, further comprising:

   The control unit sends a third control signal to the ink supply unit according to the first feedback signal. The third control signal is used to adjust the pressure of the ink so that the flying speed of the ink droplets is greater than or equal to the first The preset speed is less than or equal to the second preset speed.
8. The method according to any one of claims 3 to 7, wherein the first shape further includes the diameter of the main body of the ink droplet, and the method according to the shape of the ink droplet and the preset shape of the ink droplet. The relationship sends a first feedback signal to the control unit, including:

   When the diameter of the ink drop body is smaller than the third preset value or larger than the fourth preset value, the image processing unit sends the first feedback signal to the control unit.
9. The method of claim 8, wherein the control unit adjusts the first drive signal and/or the first control signal according to the first feedback signal, including:

   The control unit sends a third driving signal to the nozzle unit according to the first feedback signal, the third driving signal is used to adjust the diameter of the main body of the ink droplet, so that the diameter of the main body of the ink droplet is larger than Or equal to the third preset value and less than or equal to the fourth preset value.
10. The method according to any one of claims 1 to 9, characterized in that the ink droplets are obtained by breaking ink lines, and the ink droplet shape further includes a second form, and the second form includes the breakage of the ink lines. position, and sending a first feedback signal to the control unit based on the relationship between the ink drop shape and the preset ink drop shape, including:

    When the first distance between the breaking position of the ink line and the nozzle is less than the fifth preset value or greater than the sixth preset value, the image processing unit sends the first feedback signal to the control unit.
11. The method of claim 10, wherein the control unit adjusts the first driving signal and/or the first control signal according to the first feedback signal, including:

    The control unit sends a fourth driving signal to the nozzle unit according to the first feedback signal. The fourth driving signal is used to adjust the temperature of the ink or the signal amplitude, waveform and frequency of the driving signal so that the The first distance is greater than or equal to the fifth preset value and less than or equal to the sixth preset value.
12. The method according to claim 10 or 11, characterized in that the second form further includes the deflection of the ink line, and the control is configured according to the relationship between the ink drop form and the preset ink drop form. The unit sends the first feedback signal, including:

    When the deflection of the ink line is greater than a seventh preset value, the image processing unit sends the first feedback signal to the control unit.
13. The method of claim 12, further comprising:

    The control unit sends a fourth control signal to the ink supply unit, and the fourth control signal is used to control the ink supply unit to clean the nozzle.
14. The method according to any one of claims 1-13, characterized in that the method further includes:

    The image processing unit displays the image in real time.
15. An inkjet printing device, characterized by including:

    an ink supply unit, configured to supply ink to the nozzle unit according to the first control signal sent by the control unit;

    A nozzle unit configured to control ink droplet output according to the first drive signal sent by the control unit;

    An imaging unit, configured to acquire an image of the ink droplet and send the image to an image processing unit;

    The image processing unit is configured to determine the ink droplet shape of the ink droplet based on the image, and send a first feedback signal to the control unit based on the relationship between the ink droplet shape and the preset ink droplet shape;

    The control unit is used to adjust the first driving signal and/or the first control signal according to the first feedback signal.
16. The device according to claim 15, wherein the ink droplet shape is an ink droplet shape, and the ink droplet shape in the figure is The image processing unit is specifically used for:

    When the similarity between the ink droplet shape and the image template is less than a first preset similarity, the image processing unit sends the first feedback signal to the control unit, and the first feedback signal is used for the control The unit adjusts the first driving signal and/or the first control signal so that the similarity between the ink droplet shape and the image template is greater than or equal to a first preset similarity.
17. The device according to claim 15, wherein the ink droplet shape includes a first shape, the first shape includes the diameter of the ink droplet tail, and the image processing unit is specifically used for:

    When the diameter of the ink droplet tail is less than the first preset value or greater than the second preset value, the image processing unit sends the first feedback signal to the control unit.
18. The device according to claim 17, characterized in that the control unit is specifically used for:

    A second driving signal is sent to the nozzle unit according to the first feedback signal. The second driving signal is used to adjust the temperature of the ink so that the diameter of the ink droplet tail is greater than or equal to a first preset value. and less than or equal to the second preset value.
19. The device according to claim 17 or 18, characterized in that the control unit is specifically used for:

    A second control signal is sent to the ink supply unit according to the first feedback signal. The second control signal is used to adjust the viscosity of the ink so that the diameter of the ink droplet tail is greater than or equal to the first preset value. value and is less than or equal to the second preset value.
20. The device according to claim 18 or 19, wherein the first form further includes the flight speed of the ink droplets, and the image processing unit is specifically used for:

    When the flight speed of the ink droplets is less than the first preset speed, or greater than the second preset speed, the image processing unit sends the first feedback signal to the control unit.
21. The device according to claim 20, characterized in that the control unit is also used for:

    A third control signal is sent to the ink supply unit according to the first feedback signal, and the third control signal is used to adjust the pressure of the ink so that the flying speed of the ink droplets is greater than or equal to the first preset speed and Less than or equal to the second preset speed.
22. The device according to any one of claims 15-21, wherein the first form further includes the diameter of the main body of the ink droplet, and the image processing unit is specifically used for:

    When the diameter of the ink drop body is smaller than the third preset value or larger than the fourth preset value, the image processing unit sends the first feedback signal to the control unit.
23. The device according to claim 22, characterized in that the control unit is specifically used for:

    A third driving signal is sent to the nozzle unit according to the first feedback signal. The third driving signal is used to adjust the diameter of the main body of the ink droplet so that the diameter of the main body of the ink droplet is greater than or equal to the third driving signal. The preset value is less than or equal to the fourth preset value.
24. The device according to any one of claims 15 to 23, characterized in that the ink droplets are obtained by breaking the ink line, and the ink droplet shape further includes a second form, and the second form includes the breakage of the ink line. position, the image processing unit is specifically used to:

    When the first distance between the breaking position of the ink line and the nozzle is less than the fifth preset value or greater than the sixth preset value, the first feedback signal is sent to the control unit.
25. The device according to claim 24, characterized in that the control unit is specifically used for:

    A fourth driving signal is sent to the nozzle unit according to the first feedback signal. The fourth driving signal is used to adjust the temperature of the ink or the signal amplitude, waveform and frequency of the ink drop excitation signal, so that the third A distance is greater than or equal to the fifth preset value and less than or equal to the sixth preset value.
26. The device according to claim 24 or 25, wherein the second form further includes the deflection of the ink line, and the image processing unit is specifically configured to:

    When the deflection of the ink line is greater than a seventh preset value, the first feedback signal is sent to the control unit.
27. The device according to claim 26, characterized in that the control unit is also used for:

    A fourth control signal is sent to the ink supply unit, and the fourth control signal is used to control the ink supply unit to clean the nozzle.
28. The device according to any one of claims 15-27, characterized in that the image processing unit is also used for:

    Display the image in real time.
29. A chip, characterized in that the chip includes a processor and a communication interface, the communication interface is used to receive a signal and transmit the signal to the processor, the processor processes the signal such that as The method of controlling ink droplet morphology according to any one of claims 1 to 14 is performed.
30. A computer-readable storage medium. Computer instructions are stored in the computer-readable storage medium. When the computer instructions are run on a computer, the ink droplet shape is controlled as described in any one of claims 1-14. method is executed.