Liquid drop generation device for improving printing uniformity and printing equipment

Abstract

The embodiment of the utility model provides a liquid drop generating device capable of improving printing uniformity and printing equipment, and the liquid drop generating device is provided with a spray hole array; the spray hole array comprises at least one first spray hole group, and the first spray hole group comprises a row of first spray holes with a first diameter, a row of second spray holes with a second diameter and a row of third spray holes with a third diameter; in the arrangement direction of the spray holes, the first spray holes are uniformly arranged at preset intervals, and the second spray holes and the third spray holes deviate by half of the preset intervals relative to the first spray holes so as to form staggered arrangement with the first spray holes; the preset interval is determined based on the product of the first diameter and a first preset coefficient, so that the projections of adjacent pixel points formed on the printing plane by the droplet sequence array corresponding to the first spray hole in the spray hole arrangement direction are tangent or intersected. According to the scheme, the printing uniformity can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printing and dyeing, and particularly relates to a liquid droplet generating device and a printing equipment for improving printing uniformity. BACKGROUND

[0002] The positioning of pixel points of liquid droplets on a substrate often causes dispersion between pixel points, thereby causing a gap problem. The dispersed liquid droplets can cause a blank area on a printing plane that is not covered by fluid, i.e., a white-out phenomenon, which reduces the printing uniformity. SUMMARY

[0003] Embodiments of the present application aim to provide a liquid droplet generating device and a printing equipment for improving printing uniformity, so as to improve the printing uniformity. The specific technical solutions are as follows:

[0004] In a first aspect, the embodiments of the present application provide a liquid droplet generating device for improving printing uniformity, which is used for printing liquid droplets on a printing plane.

[0005] The liquid droplet generating device is provided with a nozzle array, and the nozzle array includes at least one first nozzle group. The first nozzle group includes a row of first nozzles with a first diameter, a row of second nozzles with a second diameter, and a row of third nozzles with a third diameter.

[0006] In the nozzle arrangement direction, the first nozzles are uniformly arranged at a preset interval, the second nozzles and the third nozzles are offset relative to the first nozzles by half of the preset interval to form staggered arrangement with the first nozzles. The preset interval is determined based on the product of the first diameter and a first preset coefficient, so that the projection of the liquid droplet sequence array corresponding to the first nozzles on the printing plane in the nozzle arrangement direction is tangent or intersects with adjacent pixel points. The first preset coefficient is used to represent the calculation relationship between the first diameter and the diameter of the pixel point formed by the liquid droplets flowing through the first nozzle and sprayed on the printing plane.

[0007] In some embodiments, in a direction perpendicular to the nozzle arrangement direction, the interval between the projections of the first nozzles and the second nozzles is the sum of a second distance and an integer multiple of a first distance, and the interval between the first nozzles and the third nozzles is the difference between the second distance and an integer multiple of the first distance. The first distance is √3 times the preset interval, and the second distance is √3 / 6 times the preset interval.

[0008] In some embodiments, the nozzle array includes a plurality of first nozzle groups.

[0009] In the nozzle arrangement direction, the projections of the first nozzles included in different first nozzle groups are offset by the preset interval to form staggered arrangement.

[0010] In some embodiments, the orifice array further comprises at least one second orifice group, the second orifice group comprising a row of first orifices having a first diameter, a row of second orifices having a second diameter, and a row of third orifices having a third diameter;

[0011] In the orifice arrangement direction, the first orifices comprised by the second orifice group are offset by half of the preset pitch from the projections of the first orifices comprised by the first orifice group, to form a staggered arrangement.

[0012] In some embodiments, the orifice array comprises a plurality of second orifice groups;

[0013] In the orifice arrangement direction, the first orifices comprised by different second orifice groups are offset by the preset pitch from the projections of the first orifices comprised by the first orifice group, to form a staggered arrangement.

[0014] In some embodiments, the droplet generator further comprises:

[0015] a common fluid path communicating each orifice comprised by the first orifice group and the second orifice group;

[0016] a common transducer to apply energy drive pulses at a preset printing frequency to cause each orifice comprised by the first orifice group and the second orifice group to form a droplet sequence array.

[0017] In some embodiments, the second diameter is equal to the third diameter; the droplet generator further comprises:

[0018] a first fluid path communicating the first orifices comprised by the first orifice group and the second orifice group;

[0019] a second fluid path communicating the second orifices and the third orifices comprised by the first orifice group and the second orifice group;

[0020] a first transducer to apply energy drive pulses at a preset printing frequency to cause the first orifices comprised by the first orifice group and the second orifice group to form a droplet sequence array;

[0021] a second transducer to apply energy drive pulses at a preset printing frequency to cause the second orifices and the third orifices comprised by the first orifice group and the second orifice group to form a droplet sequence array.

[0022] In some embodiments, in a direction perpendicular to the orifice arrangement direction, the pitch of the projections of the first orifices comprised by the first orifice group and the second orifice group is a sum of half of a first distance and an integer multiple of the first distance, the first distance being √3 times the preset pitch.

[0023] In some embodiments, the second diameter is equal to the third diameter.

[0024] In the arrangement direction of the ejection orifices, the midpoint of the center line of the projections of two first ejection orifices included in the adjacent first ejection orifice group, the center of one of the two first ejection orifices, and the center of a target first ejection orifice included in the adjacent first ejection orifice group adjacent to the projections of the two first ejection orifices form a second triangle; the target first ejection orifice is located inside the first triangle, and the target first ejection orifice is a second ejection orifice or a third ejection orifice.

[0025] In the arrangement direction of the ejection orifices, the midpoint of the center line of the projections of two first ejection orifices included in the adjacent first ejection orifice group, the center of one of the two first ejection orifices, and the center of a target first ejection orifice included in the adjacent first ejection orifice group adjacent to the projections of the two first ejection orifices form a second triangle; the target first ejection orifice is located inside the first triangle, and the target first ejection orifice is a second ejection orifice or a third ejection orifice.

[0026] In the arrangement direction of the ejection orifices, the midpoint of the center line of the projections of two first ejection orifices included in the adjacent first ejection orifice group, the center of one of the two first ejection orifices, and the center of a target first ejection orifice included in the adjacent first ejection orifice group adjacent to the projections of the two first ejection orifices form a second triangle; the target first ejection orifice is located inside the first triangle, and the target first ejection orifice is a second ejection orifice or a third ejection orifice.

[0027] In the arrangement direction of the ejection orifices, the midpoint of the center line of the projections of two first ejection orifices included in the adjacent first ejection orifice group, the center of one of the two first ejection orifices, and the center of a target first ejection orifice included in the adjacent first ejection orifice group adjacent to the projections of the two first ejection orifices form a second triangle; the target first ejection orifice is located inside the first triangle, and the target first ejection orifice is a second ejection orifice or a third ejection orifice.

[0028] In a second aspect, the embodiments of the present application provide a printing device for improving printing uniformity, comprising:

[0029] The first aspect provides any of the droplet generating apparatuses described above; the droplet generating apparatus is provided with a nozzle array, the nozzle array comprises at least one first nozzle group, the first nozzle group comprises a row of first nozzles with a first diameter, a row of second nozzles with a second diameter, and a row of third nozzles with a third diameter; in the nozzle arrangement direction, the first nozzles are uniformly arranged at a preset interval, the second nozzles and the third nozzles are offset by half of the preset interval relative to the first nozzles to form staggered arrangement with the first nozzles; the preset interval is determined based on the product of the first diameter and a first preset coefficient, so that the projection of the droplet sequence array corresponding to the first nozzles on the printing plane in the nozzle arrangement direction is tangent or intersects with adjacent pixel points; the first preset coefficient is used to represent the calculation relationship between the first diameter and the diameter of the pixel points formed by the droplet jet through the first nozzle on the printing plane;

[0030] The relative transmission mechanism transports the printing plane relative to the droplet generating apparatus along the speed direction to form relative motion.

[0031] Alternatively, the droplet generating apparatus is mounted on the relative transmission mechanism, and the relative transmission mechanism drives the droplet generating apparatus to move along the speed direction to form relative motion.

[0032] In some embodiments, the printing device comprises a plurality of the droplet generating apparatuses, and the projections of the first nozzles of different droplet generating apparatuses in the nozzle arrangement direction are offset by the preset interval to form staggered arrangement.

[0033] In some embodiments, the printing device further comprises other droplet generating apparatuses, and the other droplet generating apparatuses are provided with a nozzle array; the nozzle array on the other droplet generating apparatuses comprises at least one second nozzle group, the second nozzle group comprises a row of first nozzles with a first diameter, a row of second nozzles with a second diameter, and a row of third nozzles with a third diameter.

[0034] In the nozzle arrangement direction, the first nozzles included in the second nozzle group are offset by half of the preset interval relative to the projection of the first nozzles included in the first nozzle group to form staggered arrangement.

[0035] The technical scheme provided in the embodiment of the application is characterized in that the first preset coefficient is used to determine the preset interval, the first nozzles adjacent in the projection direction of the nozzle arrangement direction are arranged at the preset interval, and the adjacent pixel points formed by the droplet sequence array of the first nozzles are tangent or intersected. Since the adjacent pixel points are tangent or intersected, the white area is greatly reduced, and the printing uniformity is improved. In addition, the second nozzles and the third nozzles are arranged by offsetting by half of the preset interval in the projection direction of the nozzle arrangement direction, so that the pixel points formed by the droplet sequence array of the second nozzles and the third nozzles fill the white area possibly generated by the droplet sequence array of the first nozzles, the white area is further reduced, and the printing uniformity is improved.

[0036] Of course, implementing any product of the present application does not necessarily require all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0038] Figure 1a A schematic view of the three-dimensional structure of the droplet generating device provided in the embodiment of the present application;

[0039] Figure 1b A schematic view of the side view structure of the droplet generating device provided in the embodiment of the present application;

[0040] Figure 2a A schematic view of the front view structure of the nozzle plate provided in the embodiment of the present application;

[0041] Figure 2b A schematic view of the front view structure of the nozzle plate provided in the embodiment of the present application;

[0042] Figure 2c A schematic view of the front view structure of the nozzle plate provided in the embodiment of the present application;

[0043] Figure 2d A schematic view of the front view structure of the nozzle plate provided in the embodiment of the present application;

[0044] Figure 2e A schematic view of the pixel points formed after printing the printing plane provided in the embodiment of the present application;

[0045] Figure 2f A schematic view of the pixel points formed after printing the printing plane provided in the embodiment of the present application;

[0046] Figure 3a A fifth schematic view of a front structure of a nozzle plate according to an embodiment of the present application;

[0047] Figure 3b A sixth schematic view of a front structure of a nozzle plate according to an embodiment of the present application;

[0048] Figure 4a A seventh schematic view of a front structure of a nozzle plate according to an embodiment of the present application;

[0049] Figure 4b An eighth schematic view of a front structure of a nozzle plate according to an embodiment of the present application; Figure 4a A schematic view of pixel points formed after printing a printing plane using the nozzle plate shown in the eighth schematic view according to an embodiment of the present application;

[0050] Figure 5a A third schematic view of pixel points formed after printing a printing plane according to an embodiment of the present application;

[0051] Figure 5b A fourth schematic view of pixel points formed after printing a printing plane according to an embodiment of the present application;

[0052] Figure 5c A fifth schematic view of pixel points formed after printing a printing plane according to an embodiment of the present application;

[0053] Figure 5d A sixth schematic view of pixel points formed after printing a printing plane according to an embodiment of the present application;

[0054] Figure 6 A schematic view of a three-dimensional structure of a printing device according to an embodiment of the present application;

[0055] Figure 7 A schematic view of an angle between a liquid and a printing plane according to an embodiment of the present application;

[0056] Figure 8a A schematic view of an arrangement of a plurality of droplet-generating devices according to an embodiment of the present application;

[0057] Figure 8b A second schematic view of an arrangement of a plurality of droplet-generating devices according to an embodiment of the present application;

[0058] Figure 9 A schematic view of a front structure of two nozzle plates according to an embodiment of the present application;

[0059] Figure 10a A schematic view of a staggered arrangement of two droplet-generating devices according to an embodiment of the present application;

[0060] Figure 10b A schematic view of a staggered arrangement of a plurality of droplet-generating devices according to an embodiment of the present application;

[0061] Figure 11a Fig. 1 is a schematic diagram of pixel dots formed after printing by misaligned arrangement of two printhead plates according to an embodiment of the present application;

[0062] Figure 11b Fig. 2 is another schematic diagram of pixel dots formed after printing by misaligned arrangement of two printhead plates according to an embodiment of the present application;

[0063] Figure 11c Fig. 3 is a schematic diagram of pixel dots formed after printing by misaligned arrangement of two printhead plates according to an embodiment of the present application;

[0064] Substrate 100; fluid tank 110; liquid inlet port 111; liquid outlet port 112; liquid inlet pipe 120; first on-off valve 121; pressure sensor 122; liquid outlet pipe 130; second on-off valve 131; printhead plate 200; nozzle 210; transducer assembly 300; transducer 310; waveform generator 320; ground wire 330; support frame assembly 400; support frame 410; first fixing lug 420; second fixing lug 430; liquid supply assembly 500; base material 600; relative transmission mechanism 700; droplet generating device 800; control device 810. DETAILED DESCRIPTION

[0065] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art based on the present application belong to the scope of protection of the present application.

[0066] For the convenience of understanding, the words appearing in the embodiments of the present application will be explained below.

[0067] Printing plane: the plane in which the printed base material is located when performing a printing operation.

[0068] Pixel dot: the area formed when the droplet ejected by the droplet generating device falls on the printing plane.

[0069] White-out area: the area on the printing plane that is not printed.

[0070] Droplet sequence: multiple independent droplets formed by liquid separation along the same path.

[0071] As described in the background, in the current printing and dyeing technology, due to the existence of overlapping or gap between adjacent liquid pixels, the printing efficiency is reduced or the uniformity is poor. Due to the different ejection principles of the jet printing technology and the drop-on-demand technology, the timing of the liquid droplet ejection and the size of the liquid droplet volume cannot be adjusted and controlled separately, and it is difficult to solve the uniformity problem by only controlling the method of liquid droplet generation.

[0072] To solve the above problems, the embodiments of the present application focus on improving the layout of the nozzle array, and provide a liquid droplet generation device 800 for printing liquid droplets on a printing plane. The liquid ejected by the liquid droplet generation device 800 can be a liquid containing a coloring substance, such as a dye. The liquid can be one of a high-temperature dispersed dye liquid, a low-temperature dispersed dye liquid, a reactive liquid, and an acid liquid. Preferably, the tension of the liquid is 18 mN / m to 72 mN / m. The substrate of the printing plane can be a textile or other sheet material.

[0073] One implementation form of the liquid droplet generation device 800 has a three-dimensional structure as shown in Figure 1a , and a side view structure as shown in Figure 1b . The liquid droplet generation device 800 can include a substrate 100, a liquid inlet pipe 120, a nozzle plate 200, and a transducer assembly 300. The substrate 100 is provided with a fluid groove 110, the groove opening of the fluid groove 110 faces outward, and the groove wall of the fluid groove 110 is provided with a liquid inlet port 111. The liquid inlet pipe 120 communicates with the liquid inlet port 111, and the liquid inlet pipe 120 is used to pass the liquid into the fluid groove 110 through the liquid inlet port 111. The nozzle plate 200 is provided with a nozzle 210, the nozzle plate 200 covers the groove opening, and the nozzle 210 communicates with the fluid groove 110. The transducer assembly 300 is connected with the substrate 100, and the transducer assembly 300 is used to convert pulse electric energy into pulse mechanical energy based on a preset printing frequency, so that the substrate 100 vibrates, the liquid ejected from the nozzle 210 is disturbed to form a liquid droplet sequence for printing, that is, the transducer assembly 300 is used to apply energy driving pulse to the liquid ejected from the nozzle 210 based on the preset printing frequency, so that the liquid ejected from the nozzle 210 forms a liquid droplet sequence array.

[0074] The liquid droplet generation device 800 provided by the embodiments of the present application, the liquid enters the fluid groove 110 through the liquid inlet pipe 120. Since the nozzle plate 200 covers the groove opening of the fluid groove 110, the nozzle 210 of the nozzle plate 200 communicates with the fluid groove 110, and the liquid is ejected from the nozzle 210. Since the transducer assembly 300 is connected with the substrate 100, the transducer assembly 300 converts pulse electric energy into pulse mechanical energy, so that the liquid ejected from the nozzle 210 is disturbed to form a liquid droplet sequence, so as to print on the substrate 600. The liquid can be used for dyeing the substrate.

[0075] In some embodiments, as shown in Figure 1a andFigure 1b As shown, the transducing assembly 300 includes a transducer 310 and a waveform generator 320. The transducer 310 is disposed on the substrate 100, and the waveform generator 320 is connected to the transducer 310. The waveform generator 320 is configured to transmit pulsed electric energy to the transducer 310, and the transducer 310 is configured to convert the pulsed electric energy into pulsed waves to vibrate the substrate 100. The waveform generator 320 transmits a set voltage and current to the transducer 310, and the transducer 310 converts the pulsed electric energy into pulsed waves and transmits the pulsed waves to the substrate 100. The substrate 100 vibrates with the orifice plate 200, and the pulsed waves are transmitted to the liquid through the orifice plate 200, so that the liquid is disturbed, and the liquid column breaks to generate liquid droplets. The transducer 310 is also grounded through a ground wire 330. The transducer 310 has a working frequency of 1 KHz-70 KHz and a working voltage of 5v-40v. The waveform of the transducer 310 is a square wave, a sine wave, a cosine wave, or other forms of pulsed waves, etc.

[0076] In some embodiments, the transducing assembly 300 can include a plurality of transducers 310 symmetrically disposed about the substrate 100. By disposing the transducers 310 on both sides of the substrate 100 symmetrically, the plurality of transducers 310 simultaneously transmit pulsed waves to the substrate 100, so that the orifice plate 200 vibrates more uniformly, and the generated liquid droplets are also more uniform, thereby improving the printing uniformity of the liquid droplet generating device 800. As shown, Figure 1a As shown, the right side of the substrate 100 is provided with a transducer 310, and correspondingly, the left side of the substrate 100 is symmetrically provided with a transducer 310(not shown in the figure). Figure 1a

[0077] In some embodiments, as shown, Figure 1a As shown, the liquid inlet pipe 120 is provided with a first on-off valve 121. When printing (i.e., printing) the substrate 600, the first on-off valve 121 is opened, so that the liquid enters the liquid tank 110 through the liquid inlet pipe 120.

[0078] ​In some embodiments, the droplet generating device 800 may further include a controller (not shown), which is electrically connected to the transducer assembly 300. The liquid inlet pipe 120 is provided with a pressure sensor 122, which is electrically connected to the controller. The pressure sensor 122 is used to detect the pressure of the liquid in the liquid inlet pipe 120. The controller controls the transducer assembly 300 to open based on this pressure. When the pressure of the liquid in the liquid inlet pipe 120 is less than a predetermined pressure, it indicates that the fluid tank 110 is not full of liquid and needs to be further filled to avoid a failure in droplet generation and the transducer assembly 300 idling. As the liquid continues to flow through the liquid inlet pipe 120 into the fluid tank 110, the pressure increases until it reaches a predetermined pressure. When the pressure of the liquid in the liquid inlet pipe 120 reaches the predetermined pressure, the controller controls the transducer assembly 300 to open, thereby smoothly generating controllable, uniformly sized droplets. It should be noted that the first on-off valve 121 is electrically connected to the controller so that the controller controls the opening of the first on-off valve 121 during printing on the substrate 600.

[0079] In the embodiment of the present application, a droplet generating device corresponds to an optimal pressure Pi (i=1, 2, 3, ..., n), where n is the serial number of the droplet generating device, that is, the predetermined pressure value; the value range of Pi is 20kPa-100kPa.

[0080] In some embodiments, as Figure 1a As shown, the droplet generating device 800 may also include a liquid outlet pipe 130. The wall of the fluid tank 110 is provided with a liquid outlet port 112, and the liquid outlet pipe 130 is connected to the liquid outlet port 112. The liquid outlet pipe 130 is provided with a second on-off valve 131. The liquid outlet pipe 130 and the second on-off valve 131 are used to discharge part of the liquid from the fluid tank 110 to expel air from the fluid tank 110. When printing on the substrate 600, the first on-off valve 121 and the second on-off valve 131 are opened simultaneously, and liquid enters the fluid tank 110 through the liquid inlet pipe 120, and the air in the fluid tank 110 is discharged through the liquid outlet pipe 130. As the air in the fluid tank 110 is completely discharged, the second on-off valve 131 is closed, and the controller controls the transducer assembly 300 to open to smoothly generate droplets. The liquid outlet pipe 130 is connected to the liquid supply assembly 500. As the air in the fluid tank 110 is continuously discharged, the liquid discharged from the liquid outlet pipe 130 can return to the liquid supply assembly 500, realizing liquid recycling.

[0081] In some embodiments, the orifice plate 200 is a metal or non-metallic orifice plate. The orifice plate 200 can be made of metals such as stainless steel, aluminum, and copper to extend the service life of the orifice plate 200. Alternatively, the orifice plate 200 can be made of non-metals such as plastic, silicon oxide, and nylon to enhance its corrosion resistance and prevent liquid corrosion.

[0082] In some embodiments, as shown in Figure 1a and Figure 1b The substrate 100 is in a cuboid shape, and the fluid tank 110 is arranged at one end surface of the cuboid-shaped substrate 100. The substrate 100 can also be in a rectangular cuboid shape or a square cuboid shape.

[0083] In the embodiments of the present application, the droplet generating device 800 is provided with a nozzle array, the nozzle array includes at least one first nozzle group, the first nozzle group includes a row of first nozzles with a first diameter, a row of second nozzles with a second diameter, and a row of third nozzles with a third diameter; in the nozzle arrangement direction, the first nozzles are uniformly arranged at a preset interval, the second nozzles and the third nozzles are offset by half of the preset interval relative to the first nozzles to form staggered arrangement with the first nozzles; the preset interval is determined based on the product of the first diameter and a first preset coefficient, so that the projection of the adjacent pixel points formed by the first nozzle corresponding droplet sequence array on the printing plane in the nozzle arrangement direction is tangent or intersects; the first preset coefficient is used to represent the calculation relationship between the first diameter and the diameter of the pixel point formed by the droplet jet through the first nozzle on the printing plane.

[0084] In the embodiments of the present application, the preset interval can be less than or equal to the product of the first diameter and the first preset coefficient.

[0085] Figure 2a One of the schematic front view structure diagrams of the nozzle plate provided in the embodiments of the present application is shown in Figure 2b The second schematic front view structure diagram of the nozzle plate provided in the embodiments of the present application is shown in Figure 2c The third schematic front view structure diagram of the nozzle plate provided in the embodiments of the present application is shown in Figure 2d The fourth schematic front view structure diagram of the nozzle plate provided in the embodiments of the present application is shown in Figures 2a-2d As shown, a group of nozzles 210 (such as a first nozzle group) arranged on the nozzle plate 200 are arranged in an array to form a nozzle array, and the group of nozzles 210 included in the first nozzle group includes a row of first nozzles 211 with a first diameter, a row of second nozzles 212 with a second diameter, and a row of third nozzles 213 with a third diameter.

[0086] The diameter D of the first nozzle 211 satisfies the following formula: D≥25400 / (P×C). Wherein, D is the diameter of the nozzle, in microns; P is the nozzle resolution, which is the physical accuracy of the nozzle, and is usually expressed by nozzles per inch (NPI); C is a preset coefficient (such as the first preset coefficient), used to represent the calculation relationship between the diameter D of the nozzle and the diameter D' of the pixel point formed by the droplet ejected from the nozzle on the printing plane, and the value of C can be obtained by a limited number of tests according to different factors such as liquid supply pressure, printing frequency, and substrate diffusion, and generally C∈(1.0-2.0). Wherein, 25400 is used for unit conversion, 1 inch is equal to 25400 microns.

[0087] 25400 / P is the interval distance L between the adjacent nozzles in the nozzle arrangement direction, and D' = C×D is the diameter of the droplet generated by the nozzle (the diameter of the pixel point). When D = 25400 / (P×C), the circular pixel points generated by the droplets of the adjacent nozzles are tangent to each other in the nozzle arrangement direction, as shown in FIG. 3A. When D > 25400 / (P×C), the circular pixel points generated by the droplets of the adjacent nozzles intersect with each other in the nozzle arrangement direction, as shown in FIG. 3B. Figure 2e Figure 2f Therefore, the nozzle diameter D≥25400 / (P×C) can improve the uniformity of the droplet generation device printing on the printing plane.

[0088] In the embodiments of the present application, the diameter D of the first nozzle 211 can be 10-300 microns, and the resolution P of the first nozzle 211 can be 75-1200 dpi. Different diameters D and resolutions P of the first nozzle 211 can be combined arbitrarily to change the liquid volume that can be realized by the droplet generation device 800. By enlarging the diameter D of the nozzle 210, the flow rate of the droplet generation device 800 can be improved, and the printing range can be expanded.

[0089] Optionally, the diameter D of the first nozzle 211 can be 10-80 microns. The volume of the droplet can be 4-10000 pl. Optionally, the volume of the droplet can be 4-1000 pl. When the diameter D of the first nozzle 211 is 50 microns, the volume of the generated droplet is 450 pl.

[0090] In the embodiments of the present application, a first nozzle group can be arranged on the nozzle plate 200, as shown in FIGS. 2A and 2B. Figure 2a Figure 2b In the first nozzle group, the projections of the first nozzles 211 are offset at a preset interval L in the nozzle arrangement direction, and the second nozzles 212 and the third nozzles 213 are offset at half of the preset interval L relative to the first nozzles 211 to form staggered arrangement with the first nozzles 211.​​

[0091] In some embodiments, in a direction perpendicular to the arrangement direction of the ejection holes, the distance between the projection of the first ejection hole and the second ejection hole is the sum of the second distance and an integer multiple of the first distance, and the distance between the first ejection hole and the third ejection hole is the difference between the second distance and an integer multiple of the first distance; wherein the first distance is √3 times the preset distance L, and the second distance is √3 / 6 times the preset distance L. As shown in Figure 2b .

[0092] In the embodiments of the present application, a plurality of first ejection hole groups can also be arranged on the ejection hole plate 200, as shown in Figure 2c and Figure 2d When a plurality of first ejection hole groups are arranged on the ejection hole plate 200, the projections of the plurality of first ejection hole groups in the ejection hole arrangement direction can overlap, that is, at the same position in the ejection hole arrangement direction, a first ejection hole 211 is arranged in each of the plurality of first ejection hole groups, or at the same position in the ejection hole arrangement direction, a second ejection hole 212 and a third ejection hole 213 are arranged in each of the plurality of first ejection hole groups; the projection of the first ejection hole in each first ejection hole group is offset by the preset distance L, and correspondingly, the projection of the second ejection hole and the third ejection hole in each first ejection hole group is offset by the preset distance L, as shown in Figure 2c . This facilitates industrial manufacturing and reduces processing costs.

[0093] When a plurality of first ejection hole groups are arranged on the ejection hole plate 200, the projections of the plurality of first ejection hole groups in the ejection hole arrangement direction can be staggered, that is, the ejection hole array includes a plurality of first ejection hole groups, and in the ejection hole arrangement direction, the projections of the first ejection holes 211 included in different first ejection hole groups are offset by the preset distance L to form staggered arrangement, and correspondingly, the projections of the second ejection holes and the third ejection holes in each first ejection hole group are offset by the preset distance L, as shown in Figure 2d . By staggering the plurality of first ejection hole groups in the ejection hole arrangement direction, both a higher printing resolution in the ejection hole arrangement direction and a lower processing difficulty of the ejection hole 210 can be achieved on the ejection hole plate 200 with a low ejection hole 210 resolution.

[0094] When printing is performed using the ejection hole array, the pixel points formed by the liquid ejected by the plurality of ejection holes can be complementary, reducing the white area on the printing plane after printing.

[0095] For example, in order to realize a printing resolution of 600 dpi in the direction of the nozzle array (i.e. the Y direction), 600 nozzles need to be processed in a range of 1 inch in the direction of the nozzle array of a nozzle plate. By processing two columns of nozzles in a range of 1 inch in the direction of the nozzle array of a nozzle plate, 300 nozzles are processed in each column, and each nozzle in one column is located at the middle position of the adjacent nozzles in the other column. In this way, a printing resolution of 600 dpi in the direction of the nozzle array can be realized without processing 600 nozzles in one column. Of course, by staggered arrangement of multiple columns of nozzles, higher printing resolutions such as 2400 dpi, 3600 dpi, etc. can also be realized.

[0096] In the embodiments of the present application, a plurality of first nozzle groups are arranged on the nozzle plate 200, and when the projections of the plurality of first nozzle groups in the direction of the nozzle array overlap (as shown in Figure 2c In each row of nozzles, the interval distance between the first nozzles included in the adjacent two first nozzle groups can be 25400 / P, i.e. the preset interval L, and the interval distance between the adjacent two nozzles is less than or equal to D' = C x D. Specifically, in the speed direction of the printing plane (i.e. the X direction), the distance between the centers of the projections of the adjacent two nozzles located in the same row is less than or equal to D' = C x D. In this way, when the nozzle plate 200 is used, a smaller printing frequency can be used to perform printing, thereby reducing energy consumption.

[0097] In some embodiments, one or more other nozzle groups (e.g. a second nozzle group) can be arranged on the nozzle plate 200, i.e. the nozzle array can further include at least one second nozzle group. The second nozzle group can be arranged in the manner of the first nozzle group described above.

[0098] As shown in Figure 3a and Figure 3b As shown in Figure 3a FIG. 5 is a front view of a structure of a nozzle plate according to an embodiment of the present application; Figure 3b FIG. 6 is a front view of a structure of a nozzle plate according to an embodiment of the present application. Figure 3a In the embodiment shown in Figure 3b In the embodiment shown in

[0099] In the embodiments of the present application, the nozzle array further includes at least one second nozzle group, the second nozzle group includes a row of first nozzles with a first diameter, a row of second nozzles with a second diameter, and a row of third nozzles with a third diameter; in the direction of the nozzle array, the first nozzles included in the second nozzle group are offset by half of the preset interval relative to the projections of the first nozzles included in the first nozzle group, so as to form staggered arrangement.

[0100] By the staggered arrangement of the first nozzle group and the second nozzle group, the white area on the printing plane after printing can be effectively reduced. In addition, the first nozzle group and the second nozzle group include nozzles with the same pitch and arrangement, as shown in Figure 3a and Figure 3b The white area generated after the first nozzle group ejects droplets is supplemented by the second nozzle group ejecting droplets, thereby reducing the white area and saving printing liquid.

[0101] In addition, in other embodiments, the nozzle array includes a plurality of second nozzle groups distributed along the nozzle arrangement direction. In the nozzle arrangement direction, the projections of the first nozzles included in different second nozzle groups are offset by the preset pitch to form staggered arrangement.

[0102] In some embodiments, the droplet generating device can further include a shared fluid path connected to the first nozzle group and the second nozzle group; and a shared transducer configured to apply energy driving pulses at a preset printing frequency to cause the first nozzle group and the second nozzle group to form a droplet sequence array. The shared fluid path can save processing costs and form a more compact droplet generating structure through the shared transducer.

[0103] In other embodiments, the second diameter is equal to the third diameter. The droplet generating device can further include a first fluid path connected to the first nozzles included in the first nozzle group and the second nozzle group; and a second fluid path connected to the second nozzles and the third nozzles included in the first nozzle group and the second nozzle group.

[0104] The first transducer is configured to apply energy driving pulses at a preset printing frequency to cause the first nozzles included in the first nozzle group and the second nozzle group to form a droplet sequence array. The second transducer is configured to apply energy driving pulses at a preset printing frequency to cause the second nozzles and the third nozzles included in the first nozzle group and the second nozzle group to form a droplet sequence array. For the first nozzles, the second nozzles and the third nozzles with different sizes, each has an optimal hydraulic pressure and an optimal frequency. By respectively arranging the fluid paths and the transducers, the printing can be more accurately controlled.

[0105] In the embodiments of the present application, the droplets ejected by the first nozzles form pixel points on the printing plane, and the diameter of the pixel points is the product of the first diameter and the first preset coefficient. In order to maximize the reduction of the white area, the pitch of the projections of the first nozzles included in the first nozzle group and the second nozzle group in the direction perpendicular to the nozzle arrangement direction is the sum of half of the first distance and an integer multiple of the first distance, and the first distance is √3 times the preset pitch. The preset pitch is less than or equal to the product of the first preset coefficient and the first diameter.

[0106] Figure 7 is a schematic view of a front view structure of a nozzle plate. Figure 4a Figure 8 is a schematic view of a front view structure of a nozzle plate. Figure 4a Figure 9 is a schematic view of a front view structure of a nozzle plate.

[0107] d' = √3 / 2 x L + N x L

[0108] For example, L = C x D, d' = (√3 / 2 + N) C x D.

[0109] wherein C is a first preset coefficient, D is a first diameter, L represents a preset interval, √3L represents a first distance, and N represents an optional integer constant.

[0110] Figure 10 is a schematic view of a front view structure of a nozzle plate. Figure 4a Figure 11 is a schematic view of a front view structure of a nozzle plate. Figure 4b Figure 12 is a schematic view of a front view structure of a nozzle plate. Figure 4b Figure 13 is a schematic view of a front view structure of a nozzle plate.

[0111] In the embodiments of the present application, the second diameter is equal to the third diameter.

[0112] In the nozzle arrangement direction, the midpoint of the center line of the projection of two first nozzles included in the adjacent first nozzle group, the center of one of the two first nozzles, and the center of a first nozzle included in the second nozzle group adjacent to the projection of the two first nozzles form a first triangle.

[0113] wherein one leg of the first triangle is half of the first distance, another leg of the first triangle is half of the preset interval, and the hypotenuse of the first triangle is the preset interval.

[0114] In the nozzle arrangement direction, the midpoint of the center line of the projection of two first nozzles included in the adjacent first nozzle group, the center of one of the two first nozzles, and the center of a target nozzle included in the first nozzle group adjacent to the projection of the two first nozzles form a second triangle; the target nozzle is located inside the first triangle, and the target nozzle is a second nozzle or a third nozzle.

[0115] Among them, the length of one right-angled side of the second triangle is √3 / 6 times the preset spacing, the length of the other right-angled side of the second triangle is half of the preset spacing, and the length of the hypotenuse of the second triangle is less than or equal to half of the sum of the product of the second diameter and the second preset coefficient and the product of the first diameter and the first preset coefficient. The second preset coefficient is used to represent the calculated relationship between the diameter of the second nozzle and the diameter of the pixel point formed by the droplets flowing through the second nozzle and sprayed on the printing plane.

[0116] That is, the first triangle satisfies the following formula: (√3L / 2) 2 +(L / 2) 2 =L 2 ;

[0117] The second triangle satisfies the following formula: (√3L / 6) 2 +(L / 2) 2 ≤[(C×D+C”×D”) / 2] 2 ;

[0118] Wherein, C is the first preset coefficient, C” is the second preset coefficient, D is the first diameter, D” is the second diameter, and L is the preset distance.

[0119] In the embodiment of the present application, when the above equation holds true and L=D'=C×D, the pixels corresponding to the first nozzle group and the second nozzle group can be tangent to each other, such as Figure 5a As shown, triangle 1 corresponds to the first triangle, triangle 2 corresponds to the second triangle, the large circle represents the first nozzle, and the small circles represent the second and third nozzles. This embodiment is generally used in the following scenarios: the direction of relative transmission (i.e., speed direction) perpendicular to the nozzle arrangement direction is the printing plane, and the droplet ejection path direction is perpendicular to the printing plane.

[0120] When the less than formula of the above formula holds true, the preset spacing is L=D'=C×D, the pixel points corresponding to the first nozzle group and the second nozzle group including the first nozzle can be tangent, and the pixel points corresponding to the first nozzle group and the second nozzle group including the first nozzle and the second nozzle group including the second nozzle and the third nozzle can intersect, such as Figure 5b As shown, triangle 1 corresponds to the first triangle, triangle 2 corresponds to the second triangle, the large circle represents the first nozzle, and the small circles represent the second and third nozzles.

[0121] When the above formula is less than the formula, the preset interval is L < D' = C x D, the pixel points corresponding to the first ejection holes in the first ejection hole group and the second ejection hole group can intersect, the pixel points corresponding to the first ejection hole in the first ejection hole group and the second ejection hole group and the pixel points corresponding to the second ejection hole and the third ejection hole in the first ejection hole group and the second ejection hole group can intersect, as shown in Figure 5c FIG. 1, wherein triangle 1 corresponds to the first triangle, triangle 2 corresponds to the second triangle, the large circle represents the first ejection hole, and the small circle represents the second ejection hole and the third ejection hole.

[0122] When the above formula is equal to the formula, the preset interval is L < D' = C x D, the pixel points corresponding to the first ejection holes in the first ejection hole group and the second ejection hole group can intersect, the pixel points corresponding to the first ejection hole in the first ejection hole group and the second ejection hole group and the pixel points corresponding to the second ejection hole and the third ejection hole in the first ejection hole group and the second ejection hole group can be tangent, as shown in Figure 5d FIG. 2, wherein triangle 1 corresponds to the first triangle, triangle 2 corresponds to the second triangle, the large circle represents the first ejection hole, and the small circle represents the second ejection hole and the third ejection hole.

[0123] Based on the above droplet generating device, the embodiment of the present application provides a printing device for improving printing uniformity, as shown in Figure 6 FIG. 3, which comprises at least one above-mentioned droplet generating device 800 and a relative transmission mechanism 700.

[0124] The droplet generating device 800 is provided with an ejection hole array configured to eject liquid; the liquid is driven by an energy driving pulse based on a preset printing frequency to form a droplet sequence array.

[0125] The relative transmission mechanism 700 transports the printing plane to move along the speed direction relative to the droplet generating device 800 to form relative motion; or, the droplet generating device 800 is mounted on the relative transmission mechanism 700, and the relative transmission mechanism drives the droplet generating device 800 to move along the speed direction to form relative motion.

[0126] In the technical scheme provided by the embodiment of the present application, the droplet generating device 800 is provided with an ejection hole array. The ejection hole array ejects a liquid array, and an energy driving pulse applied on the liquid array can form a droplet sequence array, and then form a pixel point on a printing plane to complete printing.

[0127] In addition, the technical scheme provided in the embodiments of the present application comprises at least one first nozzle group, the first nozzle group comprises a row of first nozzles with a first diameter, a row of second nozzles with a second diameter and a row of third nozzles with a third diameter; in the nozzle arrangement direction, the first nozzles are uniformly arranged at a preset interval, the second nozzles and the third nozzles are offset by half of the preset interval relative to the first nozzles to form staggered arrangement with the first nozzles; the preset interval is determined based on the product of the first diameter and a first preset coefficient, so that the projection of the adjacent pixel points formed by the droplet sequence array corresponding to the first nozzles on the printing plane in the nozzle arrangement direction is tangent or intersects; the first preset coefficient is used to represent the calculation relationship between the first diameter and the diameter of the pixel point formed by the droplet jet through the first nozzle on the printing plane. Since the adjacent pixel points are tangent or intersect, the white area in the printing area of the printing plane is greatly reduced, and the printing uniformity of the printing plane is improved.

[0128] In some embodiments, in order to reduce the white area, when the printing device sets a first nozzle group, the preset interval is less than or equal to the product of the first diameter and the first preset coefficient, that is, the preset interval is less than or equal to the diameter of the pixel point corresponding to the row of first nozzles.

[0129] When the printing device sets multiple first nozzle groups, the preset interval can be less than or equal to the product of the first diameter, the first preset coefficient and the number of first nozzle groups, that is, the preset interval is less than or equal to the product of the diameter of the pixel point corresponding to the first nozzle and the number of first nozzle groups. In order to improve the yield and pressure bearing capacity of the nozzle plate, in the nozzle arrangement direction, the projections of the first nozzles included in different first nozzle groups are offset by the preset interval to form staggered arrangement, that is, the preset interval is equal to the product of the diameter of the pixel point corresponding to the first nozzle and the number of first nozzle groups.

[0130] In the embodiments of the present application, the direction of the liquid jet of the droplet generating device 800 can be perpendicular to the printing plane, that is, the direction of the liquid is perpendicular to the printing plane. Based on the actual installation, there can be an included angle between the liquid of the droplet generating device 800 and the printing plane, that is, in the plane parallel to the nozzle arrangement direction, the direction of the liquid can have an included angle with the direction of the nozzle arrangement, such as the included angle α shown in Figure 7 .

[0131] When the direction of the liquid jet of the droplet generating device 800 is perpendicular to the printing plane, the length of the pixel point corresponding to each first nozzle in the nozzle arrangement direction is the product of the first diameter and the first preset coefficient, as shown in the following formula.

[0132] D 11 = C1 x D1;

[0133] wherein, D11 D1 is the first diameter.

[0134] When the direction in which the droplet generating device 800 ejects liquid is at an angle a (i.e., the target angle) with the printing plane, the length of the pixel point corresponding to each first ejection orifice in the ejection orifice arrangement direction is the quotient of the product of the first diameter and the first preset coefficient and the sine value of the target angle, as shown in the following formula.

[0135] D 12 = C2 x D1.

[0136] D 12 is the length of the pixel point corresponding to each first ejection orifice in the ejection orifice arrangement direction, C2 is the first preset coefficient / sin a, D1 is the first diameter, and a is the target angle.

[0137] As shown in Figure 6 , the printing device can include a plurality of droplet generating devices 800, a support frame assembly 400, and a liquid supply assembly 500. The plurality of droplet generating devices 800 are sequentially arranged on the support frame assembly 400 along the speed direction, and the liquid supply assembly 500 is used to supply liquid. The droplet generating device 800 is arranged on the support frame assembly 400, the first end of the liquid inlet pipe 120 of the droplet generating device 800 is in communication with the liquid inlet port 111, and the second end of the liquid inlet pipe 120 is in communication with the liquid supply assembly 500, so that the liquid inlet pipe 120 is in communication with the liquid. The liquid supply assembly 500 supplies liquid to the droplet generating device 800, and the droplet generating device 800 generates droplets to print on the substrate 600. The substrate 600 is the printing plane to be sprayed, such as fiber or fabric, etc.

[0138] In some embodiments, as shown in Figure 6 , the support frame assembly 400 includes two support frames 410. One of the two support frames 410 is connected to the first side of the plurality of substrates 100 through the first fixing lug 420; the other of the two support frames 410 is connected to the second side of the plurality of substrates 100 through the second fixing lug 430, and the first side and the second side are symmetrical about the fluid slot 110.

[0139] As shown in Figure 8a and Figure 8b , the plurality of droplet generating devices 800 include a plurality of the first ejection orifice groups arranged along the ejection orifice arrangement direction, and the projections of the first ejection orifices of different droplet generating devices in the ejection orifice arrangement direction are offset by the preset interval to form staggered arrangement. That is, the structure of each droplet generating device 800 can refer to the above Figures 2a-2d ,Figures 3a-3b as well as Figure 4a The relevant description of some parts will not be repeated here.

[0140] In the embodiment of the present application, the arrangement direction of the nozzles of the plurality of droplet generating devices 800 may be perpendicular to the velocity direction, such as Figure 8a As shown; the arrangement direction of the nozzles of the plurality of droplet generating devices 800 may also have an angle with the velocity direction, such as Figure 8b As shown, the arrangement direction of the nozzles of the plurality of droplet generating devices 800 may also have an angle θ with the velocity direction.

[0141] In actual applications, when the resolution of the nozzles 210 of the nozzle plate 200 along the nozzle arrangement direction is too small, the gaps between the nozzles 210 along the nozzle arrangement direction are too large, and white areas will appear on the substrate 600 in the nozzle arrangement direction, resulting in uneven printing. Although increasing the resolution of the nozzles 210 of the nozzle plate 200 can improve printing uniformity, it will lead to a lower yield rate and lower pressure bearing capacity of the nozzle plate 200, shortening the life of the nozzles 210 and making them more susceptible to damage. The printing device provided in the embodiments of the present application can improve printing uniformity without reducing the service life of the nozzle plate 200.

[0142] In the embodiment of the present application, the positions of the multiple droplet generating devices 800 can be arbitrarily interchanged along the velocity direction. For example, the first droplet generating device 800 is R1, the second droplet generating device 800 is R2, and the third droplet generating device is R3. The positions of the three droplet generating devices 800 can be arranged in the order R1-R2-R3, R1-R3-R2, or R2-R1-R3, etc. The first, second, and third nozzles of the nozzle group of each droplet generating device 800 have the same diameter.

[0143] Figure 9 This is a schematic diagram of the main structure of two nozzle plates 200 provided in the embodiment of the present application, as shown in FIG. Figure 9 As shown, the nozzle hole 210 is circular, and the horizontal distance between the center of the nozzle hole 210 of the first droplet generating device 800 and the center of the nozzle hole 210 of the adjacent second droplet generating device 800 is D 1-2 , the width of the first droplet generating device 800 is W1, and the width of the second droplet generating device 800 is W2, that is, D 1-2 ≥(W1+W2) / 2. Figure 9 In FIG, D is the diameter of the first nozzle hole, and L is the preset distance.

[0144] In the embodiments of the present application, in order to facilitate the processing of the ejection orifice plate and reduce the processing difficulty of the ejection orifice plate, different liquid droplet generating devices can have ejection orifice plates with the same arrangement structure, that is, different ejection orifice plates are provided with ejection orifices at the same positions in the ejection orifice arrangement direction. The first ejection orifice, the second ejection orifice and the third ejection orifice of different ejection orifice plates have the same diameter; the widths of different ejection orifice plates can be equal or not equal. By using ejection orifice plates with the same diameter of the first ejection orifice, the second ejection orifice and the third ejection orifice, different liquid droplet generating devices can all use the ejection orifice plate shown in Figure 2a In this case, in order to ensure the uniformity of printing, the ejection orifices of multiple ejection orifice plates can be arranged in a staggered manner, that is, multiple liquid droplet generating devices can be arranged in a staggered manner, as shown in Figure 10a and Figure 10b

[0145] Multiple ejection orifice plates 200 are each provided with an ejection orifice group along the ejection orifice arrangement direction, and the ejection orifice groups of multiple ejection orifice plates 200 are arranged in a staggered manner along the ejection orifice arrangement direction, so that the liquid droplets ejected by multiple ejection orifice plates 200 are tangent or intersected along the ejection orifice arrangement direction. By arranging the ejection orifice groups of different ejection orifice plates 200 in a staggered manner along the ejection orifice arrangement direction, a higher printing resolution in the ejection orifice arrangement direction (such as the Y direction) can be achieved on the ejection orifice plate 200 with a low resolution of ejection orifices 210, the processing difficulty of the ejection orifice 210 can be reduced, the damage of the ejection orifice plate 200 can be avoided, and the processing qualification rate of the ejection orifice plate 200 can be improved.

[0146] For example, in order to achieve a printing resolution of 600 dpi in the ejection orifice arrangement direction, 600 ejection orifices need to be processed in a 1-inch range in the ejection orifice arrangement direction of an ejection orifice plate. By processing 300 ejection orifices in a column in a 1-inch range in the ejection orifice arrangement direction of two ejection orifice plates respectively, and then arranging the ejection orifices of the two ejection orifice plates in a staggered manner, that is, each ejection orifice of one ejection orifice plate is arranged at the middle position of adjacent ejection orifices of the other ejection orifice plate, the printing resolution of 600 dpi in the ejection orifice arrangement direction can be achieved without processing 600 ejection orifices on one ejection orifice plate. Of course, by arranging the ejection orifices of multiple ejection orifice plates in a staggered manner, higher printing resolutions such as 2400 dpi and 600 dpi can also be achieved.

[0147] In the embodiments of the present application, the preset distances of different liquid droplet generating devices are the same.

[0148] For example, the printing device uses two ejection orifice plates shown in Figure 10a The two ejection orifice plates each include a first ejection orifice, a second ejection orifice and a third ejection orifice, and the distance W between the two ejection orifice plates is (3√3 / 2) times the diameter D' of a pixel point. The printing device uses the two ejection orifice plates shown in Figure 10a to perform printing, and the pixel points formed on the printing plane are as shown in Figures 11a-11c Figures 11a-11c ​​In the figure, a row of pixels represented by a dotted circle corresponds to one nozzle plate, a row of pixels represented by a solid circle corresponds to another nozzle plate, a solid circle represents printed pixels, and a hollow circle represents unprinted pixels. Figures 11a-11c In the Y direction, the pixels formed by the two nozzle plates are staggered and tangent, which can be achieved by adjusting the nozzle spacing; in the X direction (i.e., the speed direction), the pixels formed by each nozzle plate are tangent respectively, which can be achieved by adjusting the relative transmission speed of the printing plane.

[0149] Figures 11a-11c The schematic diagrams of the pixel points formed after printing on the printing plane at time t1, t2, and t3 are shown in sequence. Figures 11a-11c It can be seen that the staggered setting of the nozzle holes of the nozzle plate reduces the nozzle hole resolution of a single nozzle plate and reduces the difficulty of nozzle plate processing, while improving the uniformity of printing on the printing plane in the X and Y directions.

[0150] In some embodiments, as Figure 6 As shown, the printing apparatus may further include a control device 810, which is communicatively connected to the controller of each droplet generating device 800 and the relative transport mechanism 700. It should be noted that the control device 810 and the controller of each droplet generating device 800 and the relative transport mechanism 700 may be connected by either wireless or wired communication. During printing, the control device 810 controls the speed of the relative transport mechanism 700 relative to the droplet generating device 800, or controls the relative transport mechanism 700 to drive the printing mold 800 in the speed direction; and controls the pressure and energy drive pulses applied to the droplet generating device 800 to form a sequential array of droplets.

[0151] In the embodiment of the present application, multiple droplet generating devices 800 may be provided on the printing device to precisely control the amount of liquid applied to the substrate 600. The control device 810 may simultaneously control the operation of the multiple droplet generating devices 800, or control the operation of only some of the droplet generating devices 800, without limitation.

[0152] In the embodiment of the present application, the relative transmission mechanism 700 can transport the printing plane along the speed direction, and can also control the droplet generating device 800 to move along the speed direction, which is not limited.

[0153] Taking the example of the relative transmission mechanism 700 being able to transport the printing plane in the speed direction, in the embodiment of the present application, the relative transmission mechanism 700 can be implemented using the following two structures:

[0154] Structure 1, the relative transmission mechanism 700 includes a transmission component and a drive component; the surface of the transmission component is a plane, and the substrate 600 is placed on the surface of the transmission component; the drive component is arranged at both ends of the transmission component and is configured to drive the transmission component to move along the speed direction, and the transmission component drives the substrate 600 to move along the speed direction, that is, the transmission component drives the printing plane to move along the first direction.

[0155] To ensure that the transmission assembly can move the printing surface, the surface roughness of the transmission assembly is greater than a preset roughness. The preset roughness can be set according to actual needs. In some embodiments, the surface material of the transmission assembly can be rubber, plastic, or other materials to reduce equipment costs.

[0156] The first structure may be a conveyor belt or a guide belt. In this case, the substrate 600 may be placed on the conveyor belt or the guide belt, and the conveyor belt drives the substrate 600 to move along the speed direction.

[0157] Structure 2, the relative transmission mechanism 700 includes two conveying roller mechanisms; each conveying roller mechanism includes two conveying rollers, and the substrate 600 passes between the two conveying rollers included in each conveying roller mechanism. The two conveying rollers included in each conveying roller mechanism squeeze and roll each other to drive the substrate to move along the first direction, that is, drive the printing plane to move along the speed direction.

[0158] In the embodiment of the present application, the relative transmission mechanism 700 can also be implemented in a certain way, as long as the printing plane can be moved along the speed direction.

[0159] To improve printing uniformity, the controller may control the internal pressurization pressure and energy driving pulse of the droplet generating device 800 for a period of time, and then control the relative transmission mechanism 700 to move relative to the droplet generating device 800 in the speed direction.

[0160] For example, after substrate 100 vibrates for 5 to 10 seconds, substrate 600 is moved relative to transport mechanism 700 to allow droplets to be printed on substrate 600. After substrate 100 vibrates for 5 to 10 seconds, droplet generator 800 can stably generate a sequential array of droplets. Printing on substrate 600 using this stably generated sequential array of droplets improves printing uniformity.

[0161] In some embodiments, the printing device may further include other droplet generating devices, wherein the other droplet generating devices are provided with a nozzle array; the nozzle array on the other droplet generating device includes at least one second nozzle group, the second nozzle group includes a row of first nozzles with a first diameter, a row of second nozzles with a second diameter, and a row of third nozzles with a third diameter; in the nozzle arrangement direction, the first nozzle included in the second nozzle group is offset relative to the projection of the first nozzle included in the first nozzle group by half of the preset spacing to form a staggered arrangement.

[0162] The scheme has flexibility of adjustment. The installation configuration is adjusted according to the liquid droplet generating device with the same group of nozzles, which can compensate for the problem of insufficient accuracy of nozzle processing of the liquid droplet generating device, so as to reduce the production cost. Moreover, the structure is simple, and it is easier to maintain and replace. In the embodiment of the application, the liquid droplet generating device 800 and other liquid droplet generating devices are installed in the manner shown in the figure. The projection of the second nozzle group of the other liquid droplet generating device along the nozzle arrangement direction is located in the gap between the adjacent nozzle groups of the liquid droplet generating device 800. The working pressure and the working frequency of the liquid droplet generating device 800 and the other liquid droplet generating device can be the same or different. Figure 8a Or Figure 8b The projection of the second nozzle group of the other liquid droplet generating device along the nozzle arrangement direction is located in the gap between the adjacent nozzle groups of the liquid droplet generating device 800. The working pressure and the working frequency of the liquid droplet generating device 800 and the other liquid droplet generating device can be the same or different.

[0163] In addition, in the technical scheme provided in the embodiment of the application, based on the configuration parameters and the printing frequency of the liquid droplet generating device, the relative transmission speed between the printing plane and the liquid droplet generating device is determined and controlled, so that the adjacent pixel points corresponding to each group of liquid droplet generating devices are tangent or intersected in the relative transmission direction (i.e. the speed direction). Since the adjacent pixel points are tangent or intersected, the white area in the printing area of the printing plane is greatly reduced, and the printing uniformity of the printing plane is improved.

[0164] It should be noted that in this document, relational terms such as first and second and the like can 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. Moreover, the terms "comprises", "comprising", or any other variations 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 can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0165] Each of the embodiments in the specification is described in a relevant manner, and the same and similar parts between the embodiments can be referred to each other. Each embodiment focuses on the difference from other embodiments. In particular, for the printing device embodiment, since it is basically similar to the liquid droplet generating device embodiment, the description is relatively simple, and the relevant parts can be referred to the part of the description of the liquid droplet generating device embodiment.

[0166] The above only describes the preferred embodiments of the application, and is not intended to limit the protection scope of the application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A droplet generation device for printing droplets on a printing plane, the device comprising: an array of ejection orifices, the array of ejection orifices comprising at least one first group of ejection orifices, the first group of ejection orifices comprising a row of first ejection orifices having a first diameter, a row of second ejection orifices having a second diameter, and a row of third ejection orifices having a third diameter; the first ejection orifices being uniformly arranged at a predetermined interval in a direction of arrangement of the ejection orifices, the second ejection orifices and the third ejection orifices being offset by half of the predetermined interval with respect to the first ejection orifices to form a staggered arrangement with the first ejection orifices; the predetermined interval being determined based on a product of the first diameter and a first predetermined coefficient, such that projections of a sequence array of droplets corresponding to the first ejection orifices on the printing plane in the direction of arrangement of the ejection orifices are tangent or intersecting; and the first predetermined coefficient being used to represent a calculation relationship between the first diameter and a diameter of a pixel formed on the printing plane by a droplet jetted through the first ejection orifices. 2.The device of claim 1, wherein: in a direction perpendicular to the direction of arrangement of the ejection orifices, a distance between projections of the first ejection orifices and the second ejection orifices is a sum of a second distance and an integer multiple of a first distance, and a distance between projections of the first ejection orifices and the third ejection orifices is a difference between the second distance and the integer multiple of the first distance; wherein the first distance is √3 times the predetermined interval, and the second distance is √3 / 6 times the predetermined interval; the array of ejection orifices comprises a plurality of first groups of ejection orifices; and in the direction of arrangement of the ejection orifices, projections of the first ejection orifices included in different first groups of ejection orifices are offset by the predetermined interval to form a staggered arrangement. 4.The device of claim 1, wherein: the array of ejection orifices further comprises at least one second group of ejection orifices, the second group of ejection orifices comprising a row of first ejection orifices having the first diameter, a row of second ejection orifices having the second diameter, and a row of third ejection orifices having the third diameter; in the direction of arrangement of the ejection orifices, the first ejection orifices included in the second group of ejection orifices are offset by half of the predetermined interval with respect to projections of the first ejection orifices included in the first group of ejection orifices to form a staggered arrangement; the array of ejection orifices comprises a plurality of second groups of ejection orifices; and in the direction of arrangement of the ejection orifices, projections of the first ejection orifices included in different second groups of ejection orifices are offset by the predetermined interval to form a staggered arrangement. The device further comprises: a common fluid path communicating each ejection orifice included in the first group of ejection orifices and the second group of ejection orifices; and a common transducer applying energy driving pulses at a predetermined printing frequency to cause each ejection orifice included in the first group of ejection orifices and the second group of ejection orifices to form a sequence array of droplets. The second diameter is equal to the third diameter; and the device further comprises: a first fluid path communicating the first ejection orifices included in the first group of ejection orifices and the second group of ejection orifices; and a second fluid path communicating the second ejection orifices and the third ejection orifices included in the first group of ejection orifices and the second group of ejection orifices. ​ 3. The droplet generation apparatus of claim 1, wherein, ​ ​ ​ ​ ​ 5. The droplet generation device of claim 4, wherein, ​ ​ 6. Droplet generation apparatus according to claim 4 or 5, wherein, ​ ​ ​ 7. The droplet generating device of claim 4 or 5, wherein, ​ ​ ​ a first transducer to apply energy drive pulses at a preset printing frequency to cause the first ejection orifices included in the first ejection orifice group and the second ejection orifice group to form a droplet sequence array; a second transducer to apply energy drive pulses at a preset printing frequency to cause the second ejection orifices and the third ejection orifices included in the first ejection orifice group and the second ejection orifice group to form a droplet sequence array.

8. The droplet generation device according to claim 4 or 5, wherein: in a direction perpendicular to the ejection orifice arrangement direction, a distance between projections of the first ejection orifices included in the first ejection orifice group and the second ejection orifice group is a sum of half of a first distance and an integer multiple of the first distance, the first distance being √3 times the preset distance.

9. The droplet generation device of claim 8, wherein, the second diameter is equal to the third diameter; in the ejection orifice arrangement direction, a midpoint of a line connecting centers of two first ejection orifices included in an adjacent first ejection orifice group, a center of one of the two first ejection orifices, and a center of a first ejection orifice included in the second ejection orifice group adjacent to projections of the two first ejection orifices form a first triangle; wherein a length of one leg of the first triangle is half of the first distance, a length of another leg of the first triangle is half of the preset distance, and a length of a hypotenuse of the first triangle is the preset distance; in the ejection orifice arrangement direction, a midpoint of a line connecting centers of two first ejection orifices included in an adjacent first ejection orifice group, a center of one of the two first ejection orifices, and a center of a target ejection orifice included in the first ejection orifice group adjacent to projections of the two first ejection orifices form a second triangle; the target ejection orifice is inside the first triangle, and the target ejection orifice is a second ejection orifice or a third ejection orifice; wherein a length of one leg of the second triangle is √3 / 6 times the preset distance, a length of another leg of the second triangle is half of the preset distance, and a length of a hypotenuse of the second triangle is less than or equal to half of a sum of a product of the second diameter and a second preset coefficient and a product of the first diameter and a first preset coefficient, the second preset coefficient representing a calculation relationship between a diameter of the second ejection orifice and a diameter of a pixel point formed by a droplet jetted through the second ejection orifice on a printing plane.

10. A printing apparatus that improves print uniformity, characterized by, comprising: the droplet generation device of any one of claims 1-9; the droplet generation device is provided with an ejection orifice array, the ejection orifice array includes at least one first ejection orifice group, the first ejection orifice group includes a row of first ejection orifices with a first diameter, a row of second ejection orifices with a second diameter, and a row of third ejection orifices with a third diameter; in the ejection orifice arrangement direction, the first ejection orifices are uniformly arranged at a preset distance, the second ejection orifices and the third ejection orifices are offset by half of the preset distance relative to the first ejection orifices to form an interlaced arrangement with the first ejection orifices; The preset interval is determined based on a product of the first diameter and a first preset coefficient, so that projections of adjacent pixel points formed by the array of the droplet sequence corresponding to the first ejection orifice on the printing plane in the ejection orifice arrangement direction are tangent or intersect; the first preset coefficient is used to represent a calculation relationship between the first diameter and a diameter of a pixel point formed by the droplet jetted through the first ejection orifice on the printing plane; The relative transmission mechanism is used to drive the printing plane to move relative to the droplet generating device along a speed direction to form relative movement; Or, the droplet generating device is mounted on the relative transmission mechanism, and the relative transmission mechanism drives the droplet generating device to move along the speed direction to form relative movement.

11. The printing device according to claim 10, characterized in that: The printing device comprises a plurality of the droplet generating devices, and projections of the first ejection orifices of different droplet generating devices in the ejection orifice arrangement direction are offset by the preset interval to form staggered arrangement.

12. The printing device according to claim 10, wherein, Further comprising other droplet generating devices, the other droplet generating devices are provided with an ejection orifice array; the ejection orifice array on the other droplet generating devices comprises at least one second ejection orifice group, the second ejection orifice group comprises a row of first ejection orifices with a first diameter, a row of second ejection orifices with a second diameter, and a row of third ejection orifices with a third diameter; In the ejection orifice arrangement direction, the first ejection orifices included in the second ejection orifice group are offset by half of the preset interval relative to the projections of the first ejection orifices included in the first ejection orifice group to form staggered arrangement.

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