CN112140730B - Method, device and equipment for adjusting driving waveform of spray head and storage medium - Google Patents
Method, device and equipment for adjusting driving waveform of spray head and storage medium Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 54
- 239000007921 spray Substances 0.000 title abstract description 8
- 238000012360 testing method Methods 0.000 claims abstract description 103
- 238000007639 printing Methods 0.000 claims abstract description 77
- 238000007641 inkjet printing Methods 0.000 claims abstract description 21
- 238000012216 screening Methods 0.000 claims description 36
- 239000000919 ceramic Substances 0.000 claims description 25
- 238000012545 processing Methods 0.000 claims description 16
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- 238000005457 optimization Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 13
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 239000000976 ink Substances 0.000 description 64
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
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- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Ink Jet (AREA)
Abstract
The invention belongs to the technical field of industrial inkjet printing, solves the technical problem of abnormal inkjet caused by the fact that a driving waveform of a nozzle in the prior art does not meet printing requirements, and provides a method, a device, equipment and a storage medium for adjusting the driving waveform of the nozzle. Adjusting the pressurization rate and the pulse duration of the initial driving waveform of the spray head to obtain a first driving waveform group, performing test printing by using the driving waveform of the first driving waveform group to obtain an alternative driving waveform meeting the requirement, and adjusting the fitting degree of the alternative driving waveform to obtain a second driving waveform group; and performing test printing by using the driving waveforms of the second driving waveform group to obtain a target driving waveform. The invention also comprises a device, equipment and a storage medium for executing the method. The invention can automatically calibrate the driving waveform of the nozzle when different types of ink are printed, so that the ink jet effect of the nozzle is optimal, and the image printing effect is ensured.
Description
Technical Field
The invention relates to the technical field of industrial inkjet printing, in particular to a method, a device, equipment and a storage medium for adjusting a driving waveform of a spray head.
Background
Piezoelectric ink jet technology is a technique in which a plurality of minute piezoelectric ceramics are provided in the vicinity of the nozzle position of a head of a printer. The two ends of the piezoelectric ceramic can be bent and deformed under the action of changing voltage, as shown in fig. 1, 1a and 1b, the deformation amount of the piezoelectric ceramic can change along with the voltage change of the two ends of the piezoelectric ceramic, so that the volume of the chamber of the nozzle for storing ink is changed. When the driving voltage is generated, the piezoelectric ceramic deforms, the volume of the ink cavity is reduced, and the nozzle is at a non-ejection position; the voltage is reduced, the piezoelectric ceramic is restored to the original state, the volume of the ink cavity is increased, and the ink is sucked into the ink cavity; when the voltage is increased again, the piezoelectric ceramic deforms again, the nozzle sprays the ink out to complete ink jet action, and the ink is extruded out by the ink cavity through sound waves generated by contraction of the ink cavity. The ejection of ink is actually that sound waves are generated after the volume of an ink cavity is changed, and the ejection or the suction of ink is carried out under the driving of the sound waves. If the sound waves, pressure and motion generated by the piezoelectric ceramic are not synchronized, the former sound wave is not disappeared and the latter sound wave is generated again, resulting in that a new pulse signal is introduced at an erroneous time as shown by a point a in fig. 1 b. This causes ink to be reintroduced into the chamber at the instant of imminent ejection, affecting the printing effect, with higher frequencies having greater impact.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method, an apparatus, a device and a storage medium for adjusting a driving waveform of a nozzle, so as to solve the technical problem that the driving waveform of the nozzle does not satisfy the printing requirement, which results in abnormal ink ejection.
The technical scheme adopted by the invention is as follows:
the invention provides a method for adjusting a driving waveform of a spray head, which comprises the following steps:
s1: adjusting the initial pressurizing rate and the initial pulse duration of the initial driving waveform to obtain a group of pressurizing rates and a group of pulse time;
s2: obtaining a first driving waveform group by combining the adjusted pressurization rate and the pulse time;
s3: adopting the driving waveforms of the first driving waveform group to carry out test printing, and screening out alternative driving waveforms according to a test printing result;
s4: obtaining a second drive waveform group with the fitting degree different from the alternative drive waveform by adjusting the fitting degree of the alternative drive waveform;
s5: and testing and printing by adopting the driving waveforms of the second driving waveform group, and screening out target driving waveforms according to a testing and printing result.
Preferably, said S1 is preceded by;
s101: acquiring a driving voltage of a driving waveform and an electrode spacing of piezoelectric ceramics of a nozzle;
s102: according to the driving voltage and the electrode distance, obtaining the deformation quantity of the piezoelectric ceramics deformed under the driving of the driving voltage;
s103: obtaining the ink jet speed of the nozzle according to the deformation and the electrode distance;
s104: and obtaining the initial driving waveform according to the pressurizing rate corresponding to the ink jet rate and the duration corresponding to the deformation.
Preferably, the S1 includes:
s111: acquiring an initial pressurizing rate K and a pressurizing rate range [ K-A, K + A ] of the initial driving waveform, and a pulse duration T and a duration range [ T-B, T + B ] of the initial driving waveform;
s112: obtaining a rate tolerance a of the initial pressurization rate and a time tolerance b of the pulse duration;
s113: obtaining a new pressurization rate according to the pressurization rate range and the rate tolerance;
s114: and obtaining a new pulse time according to the duration range and the time tolerance.
Preferably, the S3 includes:
s31; acquiring all driving waveforms of the first driving waveform group;
s32: driving a nozzle to perform ink jet printing through the driving waveform of the first driving waveform group to obtain a first testing image group corresponding to the driving waveform;
s33: and screening all images of the first test image group, and taking the driving waveform corresponding to the image meeting the requirement as the alternative driving waveform.
Preferably, in said S33,
s331; acquiring each ink jetting time interval of the nozzle;
s332: establishing a linear model for each wave band of the driving waveform corresponding to each ink jetting time period according to the ink jetting time period;
s333: and performing linear fitting on the driving waveform corresponding to the image in the first testing image group meeting the requirement according to the linear model to obtain the alternative driving waveform.
Preferably, the S332 includes:
s3321: acquiring the ink drop ejection rate of the nozzle and the pulse time corresponding to each wave band of the driving waveform;
s3322: obtaining the pressure rate of the ink-jet chamber corresponding to each wave band according to the ink drop jet rate and the pulse time;
s3323: obtaining a driving waveform according to the pressure rate and the pulse time and a waveform fitting formula y-kx + b;
s3324: according to a plurality of said drive waveforms, according to a linear model formula: y ═ f (x)i；b)＝b1g1(x)+b2g2(x)+...+bngn(x) Establishing a linear model of each wave band of a driving waveform;
where y is the drive voltage, x is time, k is the pressurization rate, and b is a constant.
Preferably, the S2 or the S5 includes:
s251: grouping the driving waveforms of the first driving waveform group or the second driving waveform group to obtain at least one group of driving waveform groups;
s252: testing and printing the driving waveforms of the driving waveform group to obtain a testing unit image group;
s253: and screening the images of the test unit image group, and taking the driving waveform corresponding to the image meeting the requirement in the test unit image group as the alternative driving waveform or the target driving waveform.
The present invention also provides a printing apparatus comprising:
a waveform processing module: the pulse compression device is used for adjusting the initial compression rate and the initial pulse duration of the initial driving waveform to obtain a group of compression rates and a group of pulse time;
a waveform recombination module: the pulse rate and the pulse time are combined to obtain a first driving waveform group;
the test printing module: the driving waveform group is used for adopting the driving waveforms of the first driving waveform group to carry out test printing, and alternative driving waveforms are screened out according to a test printing result;
a waveform optimization module: the method comprises the steps of adjusting the fitting degree of the alternative driving waveforms to obtain a second driving waveform group different from the fitting degree of the alternative driving waveforms;
a waveform screening module; and the driving waveform group is used for testing and printing by adopting the driving waveforms of the second driving waveform group, and screening out target driving waveforms according to a test printing result.
The present invention also provides a printing apparatus, characterized by comprising: at least one processor, at least one memory, and computer program instructions stored in the memory that, when executed by the processor, implement the method of any of the above.
The invention also provides a storage medium having computer program instructions stored thereon, which when executed by a processor implement the method of any one of the above.
In conclusion, the beneficial effects of the invention are as follows:
the method comprises the steps of obtaining a first driving waveform group by adjusting the pressurization rate and the pulse duration of an initial driving waveform of a spray head, carrying out ink jet test printing by using the driving waveform of the first driving waveform group, screening out an alternative driving waveform meeting requirements from a test result, and adjusting the fitting degree of the alternative driving waveform to obtain a second driving waveform group; then, carrying out ink jet test printing by using the driving waveforms of the second driving waveform group, and screening out target driving waveforms according to a test result; the invention can automatically calibrate the driving waveform of the nozzle when different inks are printed, so that the ink-jet effect of the nozzle is optimal, and the image quality of a printed image is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, without any creative effort, other drawings may be obtained according to the drawings, and these drawings are all within the protection scope of the present invention.
FIG. 1 is a schematic diagram of a piezoelectric ink jet technology in the background of the invention;
FIG. 1a is a schematic diagram of an acoustic waveform generated by the volume change of an ink chamber in the background art of the present invention;
FIG. 1b is a schematic diagram of a driving waveform and an acoustic waveform in the background of the invention;
FIG. 1c is a schematic diagram of a driving waveform for a complete ink-jet process according to the present invention;
fig. 2 is a schematic flowchart of a method for adjusting a driving waveform of a showerhead in embodiment 1 of the present invention;
FIG. 3 is a schematic flow chart of determining an initial driving waveform in embodiment 1 of the present invention;
FIG. 4 is a schematic diagram of a process for determining a first pulse time in embodiment 1 of the present invention;
fig. 5 is a flowchart illustrating a process of determining a first optimum waveform in embodiment 1 of the present invention;
FIG. 5-1 is a diagram showing the determination of a first optimum waveform in embodiment 1 of the present invention;
FIG. 6 is a schematic flowchart of the determination of linear fitting of waveform in embodiment 1 of the present invention;
FIG. 7 is a schematic flowchart of determining a linear model of a driving waveform in embodiment 1 of the present invention;
fig. 8 is a schematic flowchart of determining a target wave driving waveform in embodiment 1 of the present invention;
FIG. 9 is a schematic structural view of a printing apparatus according to embodiment 2 of the present invention;
fig. 10 is a schematic configuration diagram of a printing apparatus in embodiment 3 of the present invention.
Parts and numbering in the drawings:
1. piezoelectric ceramics; 2. an ink chamber; 3. and (3) ink.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In case of conflict, it is intended that the embodiments of the present invention and the individual features of the embodiments may be combined with each other within the scope of the present invention.
The inkjet process of the piezo inkjet technology discussed herein is related to the drive waveform as shown in fig. 1 c:
dividing a complete ink-jet process into four stages, namely a first wave band, a second wave band, a third wave band and a fourth wave band; the pulse duration corresponding to the four wave bands is T1, T2, T3 and T4 respectively; in the first wave band, the piezoelectric ceramic 1 has initial deformation due to the initial driving voltage, and as the voltage decreases, the deformation of the piezoelectric ceramic 1 decreases, and the ink 3 is absorbed into the ink cavity 2; in the second wave band, voltage rises, piezoelectric ceramic deforms, and ink is extruded out of the nozzle; in the third wave band, the voltage is reduced, the deformation of the piezoelectric ceramics is reduced, the pressure of the chamber is reduced, the tail part of the ink is broken, and the ink jet is completed; and in the fourth wave band, the initial voltage is recovered, and the next ink jet is prepared.
Example 1:
as shown in fig. 2, a schematic flow chart of a method for adjusting a driving waveform of a nozzle provided in embodiment 1 of the present invention is shown, where the method includes:
s1: adjusting the initial pressurizing rate and the initial pulse duration of the initial driving waveform to obtain a group of pressurizing rates and a group of pulse time;
s2: obtaining a first driving waveform group by combining the adjusted pressurization rate and the pulse time;
s3: adopting the driving waveforms of the first driving waveform group to carry out test printing, and screening out alternative driving waveforms according to a test printing result;
s4: obtaining a second drive waveform group with the fitting degree different from the alternative drive waveform by adjusting the fitting degree of the alternative drive waveform;
s5: and testing and printing by adopting the driving waveforms of the second driving waveform group, and screening out target driving waveforms according to a testing and printing result.
Specifically, test printing is carried out by using an initial driving waveform of the nozzle, whether conditions of blurring, ink flying, oblique jetting and the like influencing the printing effect exist or not is judged according to a printed test image, if yes, the initial driving waveform is adjusted, and a group of new parameters of the pressurizing rate and a group of new parameters of the pulse time are obtained by changing the pressurizing rate and the pulse duration of each wave band of the initial driving waveform.
Obtaining a group of parameters of the driving waveform by freely combining or arranging and combining the pressurizing speed and the duration, and then inputting the group of parameters into a known fitting formula to obtain a first driving waveform group; and testing and printing by using the driving waveforms in the first driving waveform group to obtain a test chart corresponding to the driving waveforms in the first driving waveform group one by one, and taking the driving waveforms corresponding to the test chart meeting the requirements in the test chart as alternative driving waveforms.
Adjusting the fitting degree of the alternative driving waveforms to obtain a second driving waveform group, and performing test printing again by using the driving waveforms in the second driving waveform group to obtain a test image group corresponding to the driving waveforms in the second driving waveform group one by one; and analyzing the images in the test image group, screening out test images meeting the requirements, and taking the drive waveforms in the second drive waveform group corresponding to the test images as target drive waveforms.
It should be noted that: satisfactory images are understood to be images in which no significant defects are present in the printed test chart, such as missing ink, ink drop offset, ink drop non-uniformity, and the like.
In the method for adjusting the driving waveforms of the nozzle in embodiment 1 of the present invention, a first driving waveform group is obtained by adjusting the pressurization rate and the pulse duration of the initial driving waveform of the nozzle, then the driving waveforms of the first driving waveform group are used to perform inkjet test printing, an alternative driving waveform meeting requirements is screened out from test results, and the fitting degree of the alternative driving waveform is adjusted to obtain a second driving waveform group; then, carrying out ink jet test printing by using the driving waveforms of the second driving waveform group, and screening out target driving waveforms according to a test result; the invention can automatically calibrate the driving waveform of the nozzle when different inks are printed, so that the ink-jet effect of the nozzle is optimal, and the image quality of a printed image is ensured.
In an embodiment, as shown in fig. 3, a schematic flow chart of a method for adjusting a driving waveform of a showerhead according to an embodiment of the present invention is included before the step S1;
s101: acquiring a driving voltage of a driving waveform and an electrode spacing of piezoelectric ceramics of a nozzle;
s102: according to the driving voltage and the electrode distance, obtaining the deformation quantity of the piezoelectric ceramics deformed under the driving of the driving voltage;
s103: obtaining the ink jet speed of the nozzle according to the deformation and the electrode distance;
s104: and obtaining the initial driving waveform according to the pressurizing rate corresponding to the ink jet rate and the duration corresponding to the deformation.
Specifically, the driving voltage of the printer nozzle obtained by the sensor is according to a formula I: x ═ diE, obtaining a body for causing the ink jet chamber of the nozzleThe amount of deformation of the piezoelectric ceramic is varied, wherein x is the amount of deformation of the piezoelectric ceramic, E is the electric field intensity generated by the driving voltage (the driving voltage includes the driving voltage for controlling the ejection of ink from the head and the driving voltage for controlling the print data), and diIs the inverse piezoelectric strain constant; then according to the distance d between the electrodes at two ends of the piezoelectric ceramic0And the formula II: d0dx/dt＝didEd0And dt, the ejection speed of the nozzle is proportional to the pressure speed of the ink jet chamber, and the ejection speed of the nozzle is in positive correlation with the pulse duration of the driving voltage. Setting the pressure velocity k, a to which the ink-jet chamber is subjected<k<c; corresponding ink drop velocity v, v1 of the nozzle<v<v 2; the pulse duration t, t1 of the drive waveform<t<t 2; according to the formula three: k-dv/dt0Wherein d ist0Is the time of change of the pressure rate.
The deformation quantity and deformation time of the ink-jet chamber caused by the driving voltage and duration of each wave band of the driving waveform are obtained through a sensor, so that the initial driving waveform and the generated acoustic wave duration are obtained and can be used as the adjusting basis of the driving pulse; thereby determining a sample waveform for building a linear model.
In an embodiment, as shown in fig. 4, a schematic flow chart of a method for adjusting a driving waveform of a showerhead according to an embodiment of the present invention is shown;
the S1 includes:
s111: acquiring an initial pressurizing rate K and a pressurizing rate range [ K-A, K + A ] of the initial driving waveform, and a pulse duration T and a duration range [ T-B, T + B ] of the initial driving waveform;
s112: obtaining a rate tolerance a of the initial pressurization rate and a time tolerance b of the pulse duration;
s113: obtaining a new pressurization rate according to the pressurization rate range and the rate tolerance;
s114: and obtaining a new pulse time according to the duration range and the time tolerance.
Specifically, as shown in tables 1 and 2, the initial pressurization rate adjustable range is set to[K-A,K+A]Adjusting the initial pressurization rate to a tolerance of a, K-A being K1, K-A + a being K2, K-A +2a being K3, and K + A-2a being Kn-2And K + A-a is denoted as Kn-1And K + A is denoted as KnWherein n is an integer of 1 or more, KnIs the nth first acceleration slope; k1, K2, K3.. Kn form a corrected set of pressurization rates; T-B is T1, T-B + B is T2, T-B +2B is T3n-2And T + B-B is denoted as Tn-1And T + B is denoted as TnWherein n is an integer of 1 or more, TnThe nth first pulse time is a modified set of pulse durations T1, T2, T3.
Table 1:
| serial number | Rate of pressurization |
| K1 | K-A |
| K2 | K-A+a |
| K3 | K-A+2a |
| ...... | ...... |
| Kn-2 | K+A-2a |
| Kn-1 | K+A-a |
| Kn | K+A |
Table 2:
| serial number | Rate of pressurization |
| T1 | T-B |
| T2 | T-B+b |
| T3 | T-B+2b |
| ...... | ...... |
| Tn-2 | T+B-2b |
| Tn-1 | T+B-b |
| Tn | T+B |
And combining the pressurization rate of the pressurization rate group and the pulse duration of the pulse duration group to obtain a first driving waveform group.
By setting a limited number of pulse time and pressurizing rate, alternative driving waveforms can be obtained, so that the difficulty in waveform screening is reduced, the data processing amount is reduced, and meanwhile, the target driving waveforms obtained in the preliminary mode can be directly used for printing under a certain condition, so that the printing efficiency and the image quality are improved.
In an embodiment, as shown in fig. 5, a schematic flow chart of a method for adjusting a driving waveform of a showerhead according to an embodiment of the present invention is shown;
the S3 includes:
s31; acquiring all driving waveforms of the first driving waveform group;
s32: driving a nozzle to perform ink jet printing through the driving waveform of the first driving waveform group to obtain a first testing image group corresponding to the driving waveform;
s33: and screening all images of the first test image group, and taking the driving waveform corresponding to the image meeting the requirement as the alternative driving waveform.
Preferably, as shown in fig. 6, in said S33,
s331; acquiring each ink jetting time interval of the nozzle;
s332: establishing a linear model for each wave band of the driving waveform corresponding to each ink jetting time period according to the ink jetting time period;
s333: and performing linear fitting on the driving waveform corresponding to the image in the first testing image group meeting the requirement according to the linear model to obtain the alternative driving waveform.
Preferably, as shown in fig. 7, the S332 includes:
s3321: acquiring the ink drop ejection rate of the nozzle and the pulse time corresponding to each wave band of the driving waveform;
s3322: obtaining the pressure rate of the ink-jet chamber corresponding to each wave band according to the ink drop jet rate and the pulse time;
s3323: obtaining a driving waveform according to the pressure rate and the pulse time and a waveform fitting formula y-kx + b;
s3324: according to a plurality of said drive waveforms, according to a linear model formula: y ═ f (x)i；b)＝b1g1(x)+b2g2(x)+...+bngn(x) Establishing a linear model of each wave band of a driving waveform;
where y is the drive voltage, x is time, k is the pressurization rate, and b is a constant.
Specifically, test printing is performed according to the drive waveforms in the first drive waveform group to obtain drive waveforms corresponding to images with satisfactory effects, and it can be understood that there are no images with obvious defects, such as ink shortage, ink droplet offset, ink droplet non-uniformity and other defects, in the printed test chart; then, linear models (such as T1, T2, T3 and T4 periods in the background art) are established by corresponding the wave bands of the driving waveform to the ink jetting periods one by one; as shown in fig. 5-1, taking the time periods T1 and T2 as examples, the ink jet chamber has a pressurizing rate from K1 to K4, a driving voltage from Va to Vb, and a duration from T1 to T4, the region has countless points, each of which has a pressurizing rate K and a duration T, a linear equation of each driving waveform is obtained according to the fitting formula y-kx + b, the linear equation of each waveform is used as a model sample to obtain a linear model, and the alternative driving waveform and the target driving waveform are obtained by linear fitting of the linear waveform. Taking points a, b, c and d as examples, they correspond to slopes k1, k2, k3 and k4, respectively, and durations t1, t2, t3 and t4, respectively; and automatically screening the driving waveform of the point c by a linear model computer to serve as the optimal driving waveform in the linear model. Setting the fitting degree parameter of the driving waveform corresponding to the point c as 1, and changing the fitting degree of the driving waveform; drive waveforms corresponding to n points c1, c2,. c.n are obtained, and the target drive waveform is fitted through the linear model again.
It should be noted that: within a certain range, each coordinate point has a corresponding driving waveform pressurization rate and pulse duration, which are not limited to the pressurization rate and pulse duration corresponding to the limited driving waveforms shown in fig. 5-1, the driving waveforms and corresponding test images (data observed by the sensor) are collected to form a linear model of the printing test, a computer performs big data analysis through the linear model to obtain an ideal driving waveform, then the driving waveform sample in the model closest to the ideal driving waveform is automatically screened, and then the pressurization rate, pulse duration and/or fitting degree parameter of the driving waveform is obtained.
The method comprises the steps of obtaining at least one driving waveform sample by setting parameters of a driving waveform to construct a linear model of the driving waveform, then obtaining a processed alternative driving waveform and/or a target driving waveform by utilizing big data processing of a computer through the linear model, and automatically calibrating the driving waveform of a nozzle, so that the ink jetting effect of the nozzle is optimal, and the image quality of a printed image is ensured.
In an embodiment, as shown in fig. 8, a schematic flow chart of a method for adjusting a driving waveform of a showerhead according to an embodiment of the present invention is shown;
the S2 or the S5 comprises;
s251: grouping the driving waveforms of the first driving waveform group or the second driving waveform group to obtain at least one group of driving waveform groups;
s252: testing and printing the driving waveforms of the driving waveform group to obtain a testing unit image group;
s253: and screening the images of the test unit image group, and taking the driving waveform corresponding to the image meeting the requirement in the test unit image group as the alternative driving waveform or the target driving waveform.
Specifically, all the driving waveforms of the first driving waveform group or the second driving waveform group are grouped, and each group at least comprises at least two driving waveforms; then, test printing is carried out according to the drive waveforms of the drive waveform group, the drive waveforms corresponding to the images meeting the requirements in each group of test images are screened out to be used as samples of next waveform grouping, and then the drive waveform grouping and the test printing are repeated for multiple times; and finally obtaining a target driving waveform and/or an alternative driving waveform.
In the method for adjusting the driving waveforms of the nozzle in embodiment 1 of the present invention, a first driving waveform group is obtained by adjusting the pressurization rate and the pulse duration of the initial driving waveform of the nozzle, then the driving waveforms of the first driving waveform group are used to perform inkjet test printing, an alternative driving waveform meeting requirements is screened out from test results, and the fitting degree of the alternative driving waveform is adjusted to obtain a second driving waveform group; then, carrying out ink jet test printing by using the driving waveforms of the second driving waveform group, and screening out target driving waveforms according to a test result; the invention can automatically calibrate the driving waveform of the nozzle when different inks are printed, so that the ink-jet effect of the nozzle is optimal, and the image quality of a printed image is ensured.
Example 2
The present invention also provides a printing apparatus, as shown in fig. 9, the apparatus including:
a waveform processing module: the pulse compression device is used for adjusting the initial compression rate and the initial pulse duration of the initial driving waveform to obtain a group of compression rates and a group of pulse time;
a waveform recombination module: the pulse rate and the pulse time are combined to obtain a first driving waveform group;
the test printing module: the driving waveform group is used for adopting the driving waveforms of the first driving waveform group to carry out test printing, and alternative driving waveforms are screened out according to a test printing result;
a waveform optimization module: the method comprises the steps of adjusting the fitting degree of the alternative driving waveforms to obtain a second driving waveform group different from the fitting degree of the alternative driving waveforms;
a waveform screening module; and the driving waveform group is used for testing and printing by adopting the driving waveforms of the second driving waveform group, and screening out target driving waveforms according to a test printing result.
In the printing apparatus according to embodiment 2 of the present invention, a first driving waveform group is obtained by adjusting a pressurization rate and a pulse duration of an initial driving waveform of a nozzle, then inkjet test printing is performed using the driving waveform of the first driving waveform group, an alternative driving waveform meeting requirements is screened out from a test result, and a fitting degree of the alternative driving waveform is adjusted to obtain a second driving waveform group; then, carrying out ink jet test printing by using the driving waveforms of the second driving waveform group, and screening out target driving waveforms according to a test result; the invention can automatically calibrate the driving waveform of the nozzle when different inks are printed, so that the ink-jet effect of the nozzle is optimal, and the image quality of a printed image is ensured.
In one embodiment, the present invention provides a printing apparatus;
prior to the waveform processing module;
a parameter acquisition unit: acquiring a driving voltage corresponding to the initial driving waveform for driving the nozzle and an electrode spacing for changing the nozzle;
a deformation unit: acquiring a driving voltage of a driving waveform and an electrode spacing of piezoelectric ceramics of a nozzle;
a deformation processing unit: according to the driving voltage and the electrode distance, obtaining the deformation quantity of the piezoelectric ceramics deformed under the driving of the driving voltage;
an ink ejection rate unit: obtaining the ink jet speed of the nozzle according to the deformation and the electrode distance;
initial waveform unit: obtaining the initial driving waveform according to the pressurizing rate corresponding to the ink jet rate and the duration corresponding to the deformation
Wherein the electrode spacing is the distance between the two ends of the piezoelectric ceramic of the volume of the ink-jet chamber of the nozzle.
The deformation quantity and deformation time of the ink-jet chamber caused by the driving voltage and duration of each wave band of the driving waveform are obtained through a sensor, so that the initial driving waveform and the generated acoustic wave duration are obtained and can be used as the adjusting basis of the driving pulse; thereby determining a sample waveform for building a linear model.
In one embodiment, the present invention provides a printing apparatus, wherein the waveform processing module includes:
a waveform expansion unit: acquiring an initial pressurizing rate K and a pressurizing rate range [ K-A, K + A ] of the initial driving waveform, and a pulse duration T and a duration range [ T-B, T + B ] of the initial driving waveform;
a variable processing unit: obtaining a rate tolerance a of the initial pressurization rate and a time tolerance b of the pulse duration;
a rate unit: obtaining a new pressurization rate according to the pressurization rate range and the rate tolerance;
time unit: and obtaining a new pulse time according to the duration range and the time tolerance.
Through setting up the first pulse duration and the first pressurization rate of limited number, can obtain preliminary optimal waveform to reduce the screening degree of difficulty of waveform, reduce data processing volume, can directly print with the optimal waveform that this preliminary mode obtained simultaneously under certain conditions, improve printing efficiency and image quality.
In one embodiment, the present invention provides a printing apparatus;
the test print module includes:
a waveform acquisition unit; acquiring all driving waveforms of the first driving waveform group;
a test printing unit: driving a nozzle to perform ink jet printing through the driving waveform of the first driving waveform group to obtain a first testing image group corresponding to the driving waveform;
a waveform screening unit: and screening all images of the first test image group, and taking the driving waveform corresponding to the image meeting the requirement as the alternative driving waveform.
Preferably, in the waveform screening unit,
a band acquisition unit; acquiring each ink jetting time interval of the nozzle;
a model establishing unit: establishing a linear model for each wave band of the driving waveform corresponding to each ink jetting time period according to the ink jetting time period;
a model processing unit: and performing linear fitting on the driving waveform corresponding to the image in the first testing image group meeting the requirement according to the linear model to obtain the alternative driving waveform.
Preferably, the model building unit includes:
a time processing unit: acquiring the ink drop ejection rate of the nozzle and the pulse time corresponding to each wave band of the driving waveform;
a rate processing unit: obtaining the pressure rate of the ink-jet chamber corresponding to each wave band according to the ink drop jet rate and the pulse time;
a waveform construction unit: obtaining a driving waveform according to the pressure rate and the pulse time and a waveform fitting formula y-kx + b;
model sample unit: according to a plurality of said drive waveforms, according to a linear model formula: y ═ f (x)i；b)＝b1g1(x)+b2g2(x)+...+bngn(x) Establishing a linear model of each wave band of a driving waveform;
where y is the drive voltage, x is time, k is the pressurization rate, and b is a constant.
The method comprises the steps of obtaining at least one driving waveform sample by setting parameters of a driving waveform to construct a linear model of the driving waveform, then obtaining a processed alternative driving waveform and/or a target driving waveform by utilizing big data processing of a computer through the linear model, and automatically calibrating the driving waveform of a nozzle, so that the ink jetting effect of the nozzle is optimal, and the image quality of a printed image is ensured.
In one embodiment, the present invention provides a printing apparatus;
the waveform recombination module or the waveform screening module comprises;
a waveform grouping unit: grouping the driving waveforms of the first driving waveform group or the second driving waveform group to obtain at least one group of driving waveform groups;
grouping test unit: testing and printing the driving waveforms of the driving waveform group to obtain a testing unit image group;
a grouping and screening unit: and screening the images of the test unit image group, and taking the driving waveform corresponding to the image meeting the requirement in the test unit image group as the alternative driving waveform or the target driving waveform.
In the printing apparatus according to embodiment 2 of the present invention, a first driving waveform group is obtained by adjusting a pressurization rate and a pulse duration of an initial driving waveform of a nozzle, then inkjet test printing is performed using the driving waveform of the first driving waveform group, an alternative driving waveform meeting requirements is screened out from a test result, and a fitting degree of the alternative driving waveform is adjusted to obtain a second driving waveform group; then, carrying out ink jet test printing by using the driving waveforms of the second driving waveform group, and screening out target driving waveforms according to a test result; the invention can automatically calibrate the driving waveform of the nozzle when different inks are printed, so that the ink-jet effect of the nozzle is optimal, and the image quality of a printed image is ensured.
Example 3:
In particular, the processor may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits that may be configured to implement embodiments of the present invention.
The memory may include mass storage for data or instructions. By way of example, and not limitation, memory may include a Hard Disk Drive (HDD), floppy Disk Drive, flash memory, optical Disk, magneto-optical Disk, magnetic tape, or Universal Serial Bus (USB) Drive or a combination of two or more of these. The memory may include removable or non-removable (or fixed) media, where appropriate. The memory may be internal or external to the data processing apparatus, where appropriate. In a particular embodiment, the memory is non-volatile solid-state memory. In a particular embodiment, the memory includes Read Only Memory (ROM). Where appropriate, the ROM may be mask-programmed ROM, Programmable ROM (PROM), Erasable PROM (EPROM), Electrically Erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory or a combination of two or more of these.
The processor reads and executes the computer program instructions stored in the memory to realize the method for adjusting the driving waveform of the nozzle in any one of the embodiments 1
In one example, the printing device may also include a communication interface and a bus. The processor, the memory and the communication interface are connected through a bus and complete mutual communication.
The communication interface is mainly used for realizing communication among modules, devices, units and/or equipment in the embodiment of the invention.
The bus includes hardware, software, or both that couple the components of the printing device to one another. By way of example, and not limitation, a bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hypertransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus or a combination of two or more of these. A bus may include one or more buses, where appropriate. Although specific buses have been described and shown in the embodiments of the invention, any suitable buses or interconnects are contemplated by the invention.
Example 4
In addition, in combination with the method for adjusting the driving waveform of the nozzle in embodiment 1, an embodiment of the present invention can be implemented by providing a computer-readable storage medium. The computer readable storage medium having stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement any of the method of adjusting a showerhead drive waveform of embodiment 1 described above.
In summary, embodiments of the present invention provide a method, an apparatus, a device, and a storage medium for adjusting a driving waveform of a nozzle.
The method comprises the steps of obtaining a first driving waveform group by adjusting the pressurization rate and the pulse duration of an initial driving waveform of a spray head, carrying out ink-jet test printing by using the driving waveform of the first driving waveform group, screening out an alternative driving waveform meeting requirements from a test result, and adjusting the fitting degree of the alternative driving waveform to obtain a second driving waveform group; then, carrying out ink jet test printing by using the driving waveforms of the second driving waveform group, and screening out target driving waveforms according to a test result; the invention can automatically calibrate the driving waveform of the nozzle when different inks are printed, so that the ink-jet effect of the nozzle is optimal, and the image quality of a printed image is ensured.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of showerhead drive waveform adjustment, the method comprising:
s1: adjusting the initial pressurizing rate and the initial pulse duration of the initial driving waveform to obtain a group of pressurizing rates and a group of pulse time;
s2: obtaining a first driving waveform group by combining the adjusted pressurization rate and the pulse time;
s3: adopting the driving waveforms of the first driving waveform group to carry out test printing, and screening out alternative driving waveforms according to a test printing result;
s4: obtaining a second drive waveform group with the fitting degree different from the alternative drive waveform by adjusting the fitting degree of the alternative drive waveform;
s5: and testing and printing by adopting the driving waveforms of the second driving waveform group, and screening out target driving waveforms according to a testing and printing result.
2. The method of claim 1, wherein the S1 is preceded by;
s101: acquiring a driving voltage of a driving waveform and an electrode spacing of piezoelectric ceramics of a nozzle;
s102: according to the driving voltage and the electrode distance, obtaining the deformation quantity of the piezoelectric ceramics deformed under the driving of the driving voltage;
s103: obtaining the ink jet speed of the nozzle according to the deformation and the electrode distance;
s104: and obtaining the initial driving waveform according to the pressurizing rate corresponding to the ink jet rate and the duration corresponding to the deformation.
3. The method of adjusting a showerhead drive waveform of claim 1, wherein the S1 includes:
s111: acquiring an initial pressurizing rate K and a pressurizing rate range [ K-A, K + A ] of the initial driving waveform, and a pulse duration T and a duration range [ T-B, T + B ] of the initial driving waveform;
s112: obtaining a rate tolerance a of the initial pressurization rate and a time tolerance b of the pulse duration;
s113: obtaining a new pressurization rate according to the pressurization rate range and the rate tolerance;
s114: and obtaining a new pulse time according to the duration range and the time tolerance.
4. The method of adjusting a showerhead drive waveform of claim 2, wherein the S3 includes:
s31; acquiring all driving waveforms of the first driving waveform group;
s32: driving a nozzle to perform ink jet printing through the driving waveform of the first driving waveform group to obtain a first testing image group corresponding to the driving waveform;
s33: and screening all images of the first test image group, and taking the driving waveform corresponding to the image meeting the requirement as the alternative driving waveform.
5. The method of adjusting a driving waveform of a showerhead according to claim 4, wherein in the S33,
s331; acquiring each ink jetting time interval of the nozzle;
s332: establishing a linear model for each wave band of the driving waveform corresponding to each ink jetting time period according to the ink jetting time period;
s333: and performing linear fitting on the driving waveform corresponding to the image in the first testing image group meeting the requirement according to the linear model to obtain the alternative driving waveform.
6. The method of claim 5, wherein the S332 comprises:
s3321: acquiring the ink drop ejection rate of the nozzle and the pulse time corresponding to each wave band of the driving waveform;
s3322: obtaining the pressure rate of the ink-jet chamber corresponding to each wave band according to the ink drop jet rate and the pulse time;
s3323: obtaining a driving waveform according to the pressure rate and the pulse time and a waveform fitting formula y-kx + b;
s3324: according to a plurality of said drive waveforms, according to a linear model formula: y ═ f (x)i；b)＝b1g1(x)+b2g2(x)+...+bngn(x) Establishing a linear model of each wave band of a driving waveform;
where y is the drive voltage, x is time, k is the pressurization rate, b is a constant, "gn"represents the linear equation for point n corresponding to the drive waveform.
7. The showerhead drive waveform adjustment method of any of claims 1 to 6, wherein the S2 or the S5 includes;
s251: grouping the driving waveforms of the first driving waveform group or the second driving waveform group to obtain at least one group of driving waveform groups;
s252: testing and printing the driving waveforms of the driving waveform group to obtain a testing unit image group;
s253: and screening the images of the test unit image group, and taking the driving waveform corresponding to the image meeting the requirement in the test unit image group as the alternative driving waveform or the target driving waveform.
8. A printing apparatus, comprising:
a waveform processing module: the pulse compression device is used for adjusting the initial compression rate and the initial pulse duration of the initial driving waveform to obtain a group of compression rates and a group of pulse time;
a waveform recombination module: the pulse rate and the pulse time are combined to obtain a first driving waveform group;
the test printing module: the driving waveform group is used for adopting the driving waveforms of the first driving waveform group to carry out test printing, and alternative driving waveforms are screened out according to a test printing result;
a waveform optimization module: the method comprises the steps of adjusting the fitting degree of the alternative driving waveforms to obtain a second driving waveform group different from the fitting degree of the alternative driving waveforms;
a waveform screening module; and the driving waveform group is used for testing and printing by adopting the driving waveforms of the second driving waveform group, and screening out target driving waveforms according to a test printing result.
9. A printing apparatus, comprising: at least one processor, at least one memory, and computer program instructions stored in the memory that, when executed by the processor, implement the method of any of claims 1-7.
10. A storage medium having computer program instructions stored thereon, which when executed by a processor implement the method of any one of claims 1-7.
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| JP2001026102A (en) * | 1999-07-15 | 2001-01-30 | Nec Corp | Driving method for ink-jet recording head, and driving apparatus |
| US7150517B2 (en) * | 2003-03-28 | 2006-12-19 | Kyocera Corporation | Method for driving piezoelectric ink jet head |
| GB0321164D0 (en) * | 2003-09-10 | 2003-10-08 | Hewlett Packard Development Co | Methods,apparatus and software for printing location pattern |
| US7234788B2 (en) * | 2004-11-03 | 2007-06-26 | Dimatix, Inc. | Individual voltage trimming with waveforms |
| JP5391763B2 (en) * | 2009-03-19 | 2014-01-15 | セイコーエプソン株式会社 | Fluid ejection device |
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| CN108172524A (en) * | 2017-12-01 | 2018-06-15 | 华南理工大学 | A kind of method for regulating and controlling tft array source-drain electrode film quality by piezoelectricity waveform |
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