CN112265379B - Independent controllable array type electric jet printing spray head for inhibiting electric field crosstalk - Google Patents
Independent controllable array type electric jet printing spray head for inhibiting electric field crosstalk Download PDFInfo
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- CN112265379B CN112265379B CN202011163873.6A CN202011163873A CN112265379B CN 112265379 B CN112265379 B CN 112265379B CN 202011163873 A CN202011163873 A CN 202011163873A CN 112265379 B CN112265379 B CN 112265379B
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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
- B41J2/06—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field
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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
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
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- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
The invention belongs to the field of ink-jet printing devices, and particularly discloses an independently controllable arrayed electric jet printing nozzle for inhibiting electric field crosstalk, which comprises a nozzle orifice chip, a flow channel layer, a circuit board, an ink box and a shell, wherein: the spray hole chip comprises a spray hole plate, an electrode plate and an electrode assembly, a plurality of spray holes are formed in the spray hole plate, and a plurality of electrode pins are arranged on one side of the spray hole plate; the electrode plate is arranged below the orifice plate, the electrode plate is provided with an electrode plate through hole, and the lower end of the electrode plate is provided with an electrostatic lens; the electrode assembly comprises a control electrode and a shielding electrode, the control electrode independently adjusts an electric field at each spray hole, and the shielding electrode is used for reducing electric field crosstalk among the spray holes; the flow channel layer is arranged on the circuit board; the circuit board is arranged at the bottom of the shell, the lower surface of the circuit board is provided with a plurality of bonding pads, and the bonding pads are correspondingly connected with the electrode pins; the ink cartridge is mounted inside the housing. The invention can realize independently controllable high-resolution printing, has high efficiency and reduces the crosstalk among the nozzles.
Description
Technical Field
The invention belongs to the field of ink-jet printing devices, and particularly relates to an independently controllable arrayed electro-jet printing nozzle for inhibiting electric field crosstalk.
Background
As a mask-free direct-writing technology with high material utilization rate, the ink-jet printing has good application prospects in various production and manufacturing fields, such as printing display, printing thin-film transistors, printing solar cells and the like. Traditional ink-jet printing such as thermal foaming and piezoelectricity adopts extrusion force to spray liquid out of a nozzle, the diameter of the sprayed liquid drop is generally larger than that of a spray hole, high-resolution patterns are difficult to print, the viscosity of the printable ink is generally not more than 20cp, and high-viscosity ink cannot be printed. The electronic jet printing technology adopts electric field force as driving force to pull ink out of a nozzle, so that the diameter of a printed point is far smaller than that of the nozzle, and the ratio of the diameter of a jet orifice to the diameter of a liquid drop can reach 50: 1. The viscosity range of the printable ink of the electrofluid ink-jet printing technology is wider, and the ink with the viscosity range of 1-10000cp can be printed. Therefore, the electrohydrodynamic ink-jet printing technology has wide application prospect.
The key to realizing the electrofluid ink-jet printing is the electrofluid ink-jet printing nozzle. Metal needle tubes, capillary glass needle tubes and the like can be used as the electrofluid ink-jet printing nozzles, but the nozzles are difficult to realize large-scale and high-density integration, high-efficiency and high-precision electrofluid ink-jet printing cannot be realized, and the requirements of industrial production cannot be met. The silicon-based etching technology can be used for obtaining a large-scale hollow cylinder structure with a high depth-to-width ratio, can meet the requirement of large-scale parallel printing, but cannot be independently controlled to print, and cannot meet the printing requirement of high controllability in the fields of printing display and the like. Moreover, electric field crosstalk exists among different spray holes of the electronic jet printing nozzle, which can cause phenomena of leakage spray, jet flow inclination, liquid drop non-uniformity and the like.
Patent CN201510299992.7 proposes an electrospray chip device and a manufacturing method thereof, but it cannot control the spray printing state of each spray hole; patent CN201410289239.5 proposes a method for realizing independent controllable printing of a nozzle, but the nozzle has a large size and cannot realize high-resolution printing; patent US20180009223a1 proposes an arrayed electro-jet print head that can achieve high resolution printing, but does not address the problem of cross-talk between nozzles.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides an independently controllable arrayed electric jet printing nozzle for inhibiting electric field crosstalk, which aims to control the jet printing state of each nozzle by independently adjusting the electric field at each spray hole through a control electrode, and inhibit the electric field crosstalk among the nozzles through a shielding electrode and an electrostatic lens so as to solve the problems that the conventional electric jet printing nozzle is difficult to realize high-resolution printing, cannot independently controllable print, has low efficiency, has crosstalk among the nozzles and the like.
In order to achieve the above object, the present invention provides an independently controllable arrayed electro-jet printing nozzle for suppressing electric field crosstalk, which comprises a nozzle chip, a flow channel layer, a circuit board, an ink cartridge and a housing, wherein:
the spray hole chip comprises a spray hole plate, an electrode plate and an electrode assembly, wherein a plurality of spray holes are formed in the spray hole plate, and a plurality of electrode pins are arranged on one side of the spray hole plate; the electrode plate is arranged below the orifice plate, an electrode plate through hole is formed in the electrode plate, and an electrostatic lens is arranged at the lower end of the electrode plate; the electrode assembly comprises a control electrode and a shielding electrode, the control electrode is connected with the electrode pins and used for independently adjusting the electric field at each spray hole, and the shielding electrode is used for reducing electric field crosstalk among the spray holes;
the runner layer is mounted on the circuit board; the circuit board is arranged at the bottom of the shell, the lower surface of the circuit board is provided with a plurality of bonding pads, and the bonding pads are connected with the electrode pins in a one-to-one correspondence manner; the ink box is arranged in the shell, and when the ink box works, the ink flows from the ink box through the flow passage layer and is sprayed out from the spray holes.
Preferably, the control electrodes and the shielding electrodes are alternately arranged on the lower surface of the orifice plate, the control electrodes are correspondingly arranged at the orifices, one end of each control electrode is connected with the electrode pins through leads, and the other end of each control electrode leads out a section of lead; and insulating hydrophobic layers are arranged outside the orifice plate, the control electrode and the shielding electrode.
Preferably, the voltage applied to the spray holes needing to be opened by the control electrode is 500V-3000V, and the voltage applied to the spray holes needing not to be opened is 300V-2500V; the voltage of the shielding electrode is 0-200V greater than that of the control electrode needing to open the spray hole.
Preferably, the control electrode and the shielding electrode are alternately arranged on the lower surface of the electrode plate, a uniform metal electrode is deposited on the lower surface of the orifice plate, and an insulating hydrophobic layer is arranged outside the uniform metal electrode.
Preferably, the insulating hydrophobic layer comprises an insulating layer and a hydrophobic layer, wherein the insulating layer is formed by vacuum coating of parylene material, and the thickness of the insulating layer is 2-5 μm; the hydrophobic layer is formed by printing or spin-coating hydrophobic paint on the surface of the insulating layer.
As further preferred, the electrostatic lens has three structures: the first is that only a single metal electrode layer is provided, and the metal electrode layer is grounded; the second type is an immersion electrostatic lens structure which comprises an upper metal electrode layer, an insulating layer and a lower metal electrode layer which are arranged in sequence, wherein 100V-500V voltage is applied to the upper metal electrode layer, and the lower metal electrode layer is grounded; the third is a single lens structure comprising an upper metal electrode layer, an upper insulating layer, a middle metal electrode layer, a lower insulating layer and a lower metal electrode layer which are arranged in sequence, wherein 100V-500V voltage is applied to the upper metal electrode layer and the lower metal electrode layer, and the middle metal electrode layer is grounded.
Preferably, the orifice plate is made of an insulating material or a conductive material and a layer of insulating material, the total thickness is 50-200 μm, and the diameter of the orifice is 10-100 μm; the electrode plate is made of insulating materials and has the thickness of 100-200 mu m.
Preferably, the flow channel layer includes a flow channel layer upper plate and a flow channel layer lower plate, the flow channel layer upper plate is provided with a flow channel layer ink port, the flow channel layer lower plate is provided with a micro flow channel with a tree-shaped branch, and the micro flow channel is communicated with the flow channel layer ink port and the spray hole.
Preferably, a metal reinforcing plate is adhered to the upper surface of the circuit board, and the metal reinforcing plate is grounded; and the exposed metal parts of the circuit board are sealed by epoxy resin glue.
Preferably, the ink box comprises a positioning plate, an ink inlet, an ink outlet and an ink box flow channel, wherein mounting holes are formed at two ends of the positioning plate, and a plurality of positioning surfaces are arranged around the mounting holes; the ink inlet and the ink outlet are arranged on the positioning plate, the ink inlet is connected with an external ink supply system, ink flows in from the ink inlet and flows to the flow channel layer through the flow channel of the ink box, and the ink outlet is used for discharging the ink.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. the invention is provided with small-diameter spray orifices, the spray printing state of each spray nozzle is independently controlled by a control electrode, and the electric field crosstalk among the spray nozzles is inhibited by a crosstalk inhibition electrode system consisting of a shielding electrode and an electrostatic lens; the problems that the conventional electronic jet printing nozzle is difficult to realize high-resolution printing, cannot independently and controllably print, is low in efficiency, has crosstalk among nozzles and the like are solved, and the electronic jet printing nozzle has the advantages of being capable of being manufactured in batch, realizing submicron-level high-resolution printing, being high in printing efficiency, realizing patterned printing and the like.
2. The voltage of the control electrode at each spray hole is independently adjustable, so that whether each spray hole is sprayed or not and the state of jet flow are controlled, and the ignition state and the size of liquid drops of each spray hole are independently controllable; the shielding electrodes are independently adjustable or uniformly apply the same voltage, and can inhibit electric field crosstalk among spray holes by matching with the electrostatic lens, so that the verticality and uniformity of jet flow are improved; meanwhile, the voltage of the control electrode and the voltage of the shielding electrode are specifically set, so that the effect of reducing electric field crosstalk among different spray holes is better achieved.
3. The invention is provided with various forms of electrostatic lenses, wherein the electrode layer is grounded when a single metal layer is printed, so that the electrode layer can play a role in shielding an electric field and inhibit electric field crosstalk among spray holes; besides the electric field shielding function, the immersion lens and the single lens can focus a local electric field to play a role in inhibiting atomization and generation of satellite droplets.
4. The lower plate of the flow channel layer is provided with the micro-flow channel with tree-shaped branches, and the micro-flow channel can ensure that the flow at each spray hole is uniform; the exposed metal parts of the circuit board are sealed by epoxy resin glue, so that the conduction caused by ink permeation can be prevented, and the connection strength is enhanced.
Drawings
FIG. 1 is a cross-sectional view of a flow channel layer and a nozzle chip according to an embodiment of the present invention;
FIGS. 2(a) to 2(g) are schematic views of various structures of a nozzle chip according to an embodiment of the invention;
FIGS. 3(a) and 3(b) are schematic diagrams illustrating different shapes of the control electrode and the shielding electrode according to the embodiment of the present invention;
FIGS. 4(a) and 4(b) are schematic diagrams of different shapes of an electrostatic lens according to an embodiment of the invention;
FIG. 5 is a three-dimensional model of a flow channel layer and a nozzle chip according to an embodiment of the invention;
FIG. 6 is a cross-sectional view of an independently controllable arrayed inkjet print head according to an embodiment of the present invention;
FIG. 7 is a three-dimensional model diagram of an independently controllable arrayed electrospray nozzle assembly according to an embodiment of the present invention.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein: 1-orifice chip, 11-orifice plate, 111-orifice, 112-control electrode, 113-shield electrode, 114-insulating hydrophobic layer, 115-edge groove, 116-uniform metal electrode, 117-orifice plate electrical through hole, 118-nozzle structure, 119-electrode pin, 12-electrode plate, 121-electrostatic lens, 121 a-metal electrode layer, 121 b-insulating layer, 122-electrode plate through hole, 123-electrode plate control electrode, 124-electrode plate shield electrode, 125-electrode plate electrical through hole, 2-flow channel layer, 21-flow channel layer upper plate, 211-flow channel layer ink port, 22-flow channel layer lower plate, 221-micro-flow channel, 222-orifice ink supply port, 3-circuit board, 31-metal reinforcing plate, 32-welding plate, 4-ink box, 41-mounting hole, 42-positioning plate, 43-ink inlet, 44-ink outlet, 45-slot, 46-ink box flow channel, 5-shell and 51-outlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
An independently controllable arrayed electro-jet printing nozzle for suppressing electric field crosstalk according to an embodiment of the present invention, as shown in fig. 6 and 7, includes a nozzle chip 1, a flow channel layer 2, a circuit board 3, an ink cartridge 4, and a housing 5, where:
the orifice chip 1 comprises an orifice plate 11, an electrode plate 12 and an electrode assembly, wherein the orifice plate 11 is provided with a plurality of orifices 111, one side of the orifice plate is provided with a plurality of electrode pins 119, the electrode pins 119 are provided with orifice plate electrical through holes 117, and the electrode pins and the circuit board pins can be electrically interconnected in a way of pouring conductive silver paste; preferably, the material of the orifice plate 11 is an insulating material such as ceramic and glass, or a conductive material plus a layer of insulating material with sufficient thickness, such as silicon and SU8, as shown in fig. 2(g), the overall thickness is 50-200 μm; the diameter of the jet holes 111 is 10-100 mu m, the number of the jet holes is 8-1024, and the jet hole pitch is 100-1000 mu m; annular grooves 115 can be machined around the spray holes 111, as shown in fig. 2(b), liquid is restrained from diffusing, the inner diameter of each annular groove is 20-150 micrometers, the outer diameter of each annular groove is 40-250 micrometers, the spray holes 111 and the annular grooves 115 are machined through processes such as laser ablation or ICP etching, and liquid can also be restrained by preparing SU8 protruding structures.
The electrode plate 12 is arranged below the orifice plate 11, as shown in fig. 1, an electrode plate through hole 122 is formed in the electrode plate 12, and an electrostatic lens 121 is arranged at the lower end of the electrode plate 12; preferably, the electrode plate 12 is made of an insulating material such as ceramic or glass, and has a thickness of 100 to 200 μm.
Specifically, the electrode plate through holes 122 may have two forms, one is that each orifice of the orifice plate corresponds to a concentric electrode plate through hole, as shown in fig. 2(e) and fig. 4(b), the diameter is 50 to 400 μm; one is that all the orifices of the orifice plate correspond to a square orifice plate through hole together, as shown in fig. 2(a) and 4(a), the width of the square through hole is 50-400 μm; the electrode plate through hole 122 is processed by laser ablation or ICP etching or the like. The electrostatic lens 121 is composed of a plurality of layers of metal electrodes 121a and insulating layers 121b, and may have various forms: one is only a single metal electrode layer, as shown in fig. 2(c), the metal electrode layer is grounded during printing, which can serve as an electric field shielding function to suppress electric field crosstalk between the nozzles 111; the second is to prepare an immersion electrostatic lens structure of a metal electrode layer-an insulating layer-a metal electrode layer on the surface of the electrode plate 12, as shown in fig. 2(a), the insulating layer is made of insulating materials such as PI and the like, the thickness is 10-30 μm, when in printing, 100-500V voltage is applied to the upper electrode layer of the electrostatic lens, and the lower metal electrode layer is grounded; the third is to prepare a single lens structure of metal electrode layer-insulating layer-metal electrode layer on the surface of the electrode plate 12, as shown in fig. 2(d), when printing, 100-500V is applied to the upper and lower electrode layers of the electrostatic lens, and the middle electrode layer is grounded. Besides the electric field shielding function, the immersion lens and the single lens can focus a local electric field to play a role in inhibiting atomization and generation of satellite droplets. The electrostatic lens 121 is annular, the inner diameter of the annular is enlarged by 20 to 50 μm based on the size of the electrode plate through hole 122, and the outer diameter of the annular is enlarged by 200 to 1000 μm based on the inner hole.
The electrode assembly comprises a control electrode and a shielding electrode, the control electrode is connected with the electrode pin 119, the control electrode is used for independently adjusting the electric field at each spray hole 111, and the shielding electrode is used for reducing electric field crosstalk among the spray holes 111; preferably, the control electrode 112 and the shielding electrode 113 comprise a conductive layer and an adhesion layer, the conductive layer is made of gold or platinum and has a thickness of 70-200 nm, the adhesion layer is made of chromium or titanium and has a thickness of 20-35 nm, and the control electrode and the shielding electrode are prepared by photoetching, film coating and etching processes.
Specifically, the electrode assembly is provided in two ways: the first type is arranged on the orifice plate 11, the control electrode 112 is annular, one end of the annular is connected with the electrode pin 119 through a lead, and the other end of the annular leads is led out with the length of 0.5 mm-2 mm, so that the symmetry of an electric field at the orifice 111 is ensured; the inner diameter of the annular part is 15-150 mu m, the outer diameter is 30-250 mu m, and the width of the lead is 15-100 mu m; the voltage of the control electrode 112 at each orifice is individually adjustable to control whether or not to spray at each orifice and the state of the spray. The voltage applied to the spray holes needing to be opened is higher than the opening voltage, the voltage is 500-3000V, and the voltage applied to the spray holes needing not to be opened is lower than the opening voltage, and the voltage is 300-2500V. The shielding electrode 113 is square, square with a circular notch, or the like, and has a width of 30 to 200 μm as shown in fig. 3(a) and 3 (b); the voltage of the shielding electrode 113 can be independently adjusted or the same voltage can be uniformly applied, the voltage is equal to the voltage of the control electrode for opening the spray holes, or the voltage is increased within 200V on the basis, the voltage is 500-3200V, and the voltage can play a role in reducing electric field crosstalk among different spray holes. The surface of the orifice plate 11 is plated with an insulating hydrophobic layer 114, the insulating layer is a vacuum-coated parylene material with the thickness of 2-5 microns, the hydrophobic layer is a printed or spin-coated hydrophobic coating, such as a nano silicon oxide resin composite material, and the hydrophobic layer can inhibit ink diffusion and improve printing resolution; it is also possible to prepare the protruding nozzle structure 118 outside the insulating layer, as shown in fig. 2(g), to avoid liquid level spreading. The second is to arrange on the electrode plate, process the electrode plate control electrode 123 and the electrode plate shielding electrode 124 on the lower surface of the electrode plate 12, as shown in fig. 2(f), at this time, the uniform metal electrode 116 is deposited on the remaining part of the surface of the orifice plate except the orifice 111 within the range of 10-50 μm, the metal electrode-insulating layer-metal electrode structure is prepared on the lower surface of the electrode plate, the upper metal layer includes the control electrode and the shielding electrode, and the lower metal electrode is an integral body. During printing, the unified metal electrode of the orifice plate is applied with high voltage of 500-3000V, the control electrode and the shielding electrode on the electrode plate corresponding to the opened orifice are grounded or the low voltage is 0-200V, the control electrode corresponding to the unopened orifice is connected with higher voltage of 300-800V, and the metal electrode under the electrode plate is grounded. And preparing an insulating layer and a hydrophobic layer on the surface of the electrode by adopting the same method and material as the method for spraying the orifice plate.
The flow channel layer 2 comprises a flow channel layer upper plate 21 and a flow channel layer lower plate 22, and connection is guaranteed through a bonding process; the material of the upper plate 21 of the flow channel layer is glass or silicon, the thickness of the upper plate is 300-500 mu m, and the ink port 211 of the flow channel layer is processed through laser ablation or deep silicon etching; the material of the flow channel layer lower plate 22 is silicon, the thickness is 300-500 μm, the front surface of the silicon chip is processed into a tree-shaped branched micro-channel 221 through deep silicon etching, as shown in fig. 5, the micro-channel can ensure that the flow at each spray hole is uniform, the flow channel depth is 200-300 μm, the back surface of the silicon chip is processed into a spray hole ink supply port 222 of a through hole structure through deep silicon etching, the diameter of the spray hole ink supply port is 30-200 μm, and the depth is 50-200 μm. If the orifice plate adopts a structure of matching silicon with SU8, the flow channel can be directly etched out on the silicon chip part.
The circuit board 3 is used for leading out a jet hole chip electrode, is arranged at the bottom of the shell 5 and has the thickness of 500-2000 mu m; the upper surface of the circuit board 3 is bonded with a 2-5 mm metal reinforcing plate 31 to improve the strength of the circuit board, and the metal reinforcing plate 31 is grounded to reduce electric field crosstalk among wires of the circuit board; the circuit board 3 has a plurality of pads 32 on its lower surface, and the pads 32 are connected to the electrode pins 119 in a one-to-one correspondence, and connected by a conductive adhesive. The welding flat cable on the welding disc is connected with a high-voltage control system, and the system can improve a high-voltage signal source for the spray head; the circuit board pad 32 is a via hole pad, the lower surface is sealed by using insulating glue, and the upper surface is sealed by gluing after the flat cable is welded. After the operations such as welding and the like are finished on the exposed metal part of the circuit board, the exposed metal part of the circuit board is sealed by epoxy resin glue to prevent ink from permeating to cause conduction and enhance the connection strength.
The ink box 4 is arranged inside the shell 5, the material of the ink box 4 is ceramic, organic glass and other insulating materials, the ink box is divided into an upper part and a lower part, and the upper part and the lower part are respectively bonded by epoxy resin glue after being machined and prepared. The ink box 4 comprises a positioning plate 42, an ink inlet 43, an ink outlet 44 and an ink box flow passage 46, wherein mounting holes 41 are formed at two ends of the positioning plate 42, the mounting holes 41 are connected with the spray head fixture through bolts, and a plurality of positioning surfaces are arranged around the mounting holes 41 and used for positioning when the spray head is mounted; the positioning plate 42 is also provided with a slot 45 for inserting and fixing the shell 5; an ink inlet pipe can be inserted into the ink inlet 43 and connected to the ink supply system, and an ink outlet pipe can be inserted into the ink outlet 44 for discharging ink. Ink flows from the ink inlet 43, through the cartridge flow path 46 to the flow path layer 2.
The shell 5 is made of insulating materials such as plastics and photosensitive resin and is prepared by injection molding, machining, 3D printing and the like, so that the protective and isolating effects are achieved. The shell 5 is inserted into the ink box 4, and the shell 5 is provided with a separation plate which separates the ink area from the leading-out part (namely the annular welding disc) of the circuit board and prevents the circuit from being conducted by the ink; an outlet 51 is arranged above the shell 5 and is used for leading out the ink inlet pipe, the ink outlet pipe and the flat cable.
When the nozzle is used, firstly, the nozzle is installed on a nozzle clamp of printing equipment by using the installation hole 41 on the ink box 4 through bolt connection, and the nozzle clamp is adjusted through the leveling structure, so that the bottom surface of the nozzle is parallel to the printing substrate. The hoses are inserted into the ink inlet 43 and the ink outlet 44 of the ink box, the ink inlet hose is connected with an ink supply system, the ink supply system injects ink which is filtered and bubble-removed into the spray head through air pressure, internal cavities of the ink box 4, the flow channel layer 2, the spray hole plate 11 and the like are filled, original gas in the cavities is discharged from the spray hole 111 and the ink outlet hose, and the ink outlet hose is blocked by using the plug after the original gas in the spray head is completely discharged and stable ink which is not mixed with bubbles flows out from the ink outlet. After ink filling is completed, the other end of the flat cable welded with the circuit board bonding pad 32 on the nozzle is inserted into the corresponding port of the high-voltage control module. The ink is pressed through air pressure before printing, partial ink is extruded out, the influence on the printing effect caused by the precipitation phenomenon at the position of the spray hole is prevented, and the bottom surface of the spray head is wiped through dust-free cloth, so that no ink residue is ensured. After the nozzle is adjusted to a proper printing height, the movement of the printing substrate and the triggering of electric signals on electrodes such as a control electrode, a shielding electrode, an electrostatic lens and the like are controlled by an industrial personal computer, meanwhile, ink flows to the flow channel layer 2 from the ink inlet 43 through the ink box flow channel 46, passes through the flow channel layer ink port 211, is shunted by the micro-flow channel 221, flows to the spray hole 111 through the spray hole ink supply port 222 and is sprayed out, and patterned printing is completed.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An independently controllable arrayed electro-jet printing nozzle for suppressing electric field crosstalk comprises a nozzle orifice chip (1), a flow channel layer (2), a circuit board (3), an ink box (4) and a shell (5), wherein:
the spray hole chip (1) comprises a spray hole plate (11), an electrode plate (12) and an electrode assembly, wherein the spray hole plate is provided with a plurality of spray holes (111), and one side of the spray hole plate is provided with a plurality of electrode pins (119); the electrode plate (12) is arranged below the orifice plate (11), an electrode plate through hole (122) is formed in the electrode plate (12), and an electrostatic lens (121) is arranged at the lower end of the electrode plate (12); the electrode assembly comprises a control electrode and a shielding electrode, the control electrode is connected with the electrode pin (119), the control electrode is used for independently adjusting the size of an electric field at each spray hole (111), and the shielding electrode is used for reducing electric field crosstalk among the spray holes (111); the control electrodes and the shielding electrodes are alternately arranged on the lower surface of the spray orifice plate (11), and the control electrodes are annular and correspondingly arranged at the spray orifices (111);
the flow channel layer (2) is mounted on the circuit board (3); the circuit board (3) is arranged at the bottom of the shell (5), the lower surface of the circuit board is provided with a plurality of bonding pads (32), and the bonding pads (32) are correspondingly connected with the electrode pins (119) one by one; the ink box (4) is arranged in the shell (5), and when the ink box works, ink flows from the ink box (4) through the flow passage layer (2) and is ejected from the jet hole (111).
2. The independently controllable arrayed electrospray nozzle for suppressing electric field crosstalk according to claim 1, wherein one end of the control electrode is connected to the electrode pin (119) by a lead, and the other end leads out a section of lead; and an insulating hydrophobic layer (114) is arranged outside the orifice plate (11), the control electrode and the shielding electrode.
3. The independently controllable arrayed electrojet print head of claim 2, wherein the voltage applied to the control electrode to the orifices that need to be opened is in the range of 500V to 3000V, and the voltage applied to the orifices that do not need to be opened is in the range of 300V to 2500V; the voltage of the shielding electrode is 0-200V greater than that of the control electrode needing to open the spray hole.
4. The independently controllable arrayed electrojet print head for suppressing electric field crosstalk according to claim 1, wherein the control electrodes and the shielding electrodes are alternately disposed on the lower surface of the electrode plate (12), and when the uniform metal electrode (116) is deposited on the lower surface of the orifice plate (11), the uniform metal electrode (116) is externally provided with an insulating hydrophobic layer (114).
5. The independently controllable arrayed electrospray nozzle for suppressing electric field crosstalk according to claim 2 or 4, wherein the insulating hydrophobic layer (114) comprises an insulating layer and a hydrophobic layer, wherein the insulating layer is vacuum coated with parylene material and has a thickness of 2 μm to 5 μm; the hydrophobic layer is formed by printing or spin-coating hydrophobic paint on the surface of the insulating layer.
6. The independently controllable arrayed electrospray showerhead for suppressing electric field crosstalk according to claim 1, wherein the electrostatic lens (121) has three configurations: the first is that only a single metal electrode layer is provided, and the metal electrode layer is grounded; the second type is an immersion electrostatic lens structure which comprises an upper metal electrode layer, an insulating layer and a lower metal electrode layer which are arranged in sequence, wherein 100V-500V voltage is applied to the upper metal electrode layer, and the lower metal electrode layer is grounded; the third is a single lens structure comprising an upper metal electrode layer, an upper insulating layer, a middle metal electrode layer, a lower insulating layer and a lower metal electrode layer which are arranged in sequence, wherein 100V-500V voltage is applied to the upper metal electrode layer and the lower metal electrode layer, and the middle metal electrode layer is grounded.
7. The independently controllable arrayed electrospray nozzle for suppressing electric field crosstalk according to claim 1, wherein the orifice plate (11) is made of an insulating material, or a conductive material plus a layer of insulating material, with a total thickness of 50 μm to 200 μm, and the diameter of the orifice (111) is 10 μm to 100 μm; the electrode plate (12) is made of insulating materials and has the thickness of 100-200 mu m.
8. The independently controllable arrayed electrospray nozzle for suppressing electric field crosstalk according to claim 1, wherein the flow channel layer (2) comprises a flow channel layer upper plate (21) and a flow channel layer lower plate (22), the flow channel layer upper plate (21) is provided with a flow channel layer ink port (211), the flow channel layer lower plate (22) is provided with a tree-shaped branched micro-channel (221), and the micro-channel (221) is communicated with both the flow channel layer ink port (211) and the nozzle (111).
9. The independently controllable arrayed electrospray nozzle for suppressing electric field crosstalk according to claim 1, wherein a metal reinforcing plate (31) is bonded to the upper surface of the circuit board (3), the metal reinforcing plate (31) being grounded; and the metal exposed part of the circuit board (3) is sealed by epoxy resin glue.
10. The independently controllable arrayed electrospray nozzle for suppressing electric field crosstalk according to claim 1, wherein the ink cartridge (4) comprises a positioning plate (42), an ink inlet (43), an ink outlet (44) and a cartridge flow channel (46), wherein mounting holes (41) are formed at two ends of the positioning plate (42), and a plurality of positioning surfaces are formed around the mounting holes (41); the ink inlet (43) and the ink outlet (44) are both arranged on the positioning plate (42), the ink inlet (43) is connected with an external ink supply system, ink flows in from the ink inlet (43) and flows to the flow channel layer (2) through the ink box flow channel (46), and the ink outlet (44) is used for discharging ink.
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| CN112937122B (en) * | 2021-01-28 | 2022-11-11 | 华中科技大学 | Electronic jet printing nozzle and system capable of spraying uniformly |
| CN113478973B (en) * | 2021-06-01 | 2022-04-29 | 华中科技大学 | Arrayed electrofluid jet printing control method and device for inhibiting jet inclination |
| CN113682056B (en) * | 2021-07-26 | 2022-07-26 | 华南理工大学 | Electric jet printing nozzle, electric jet printing nozzle array and non-charged ink jet method |
| CN117283991B (en) * | 2023-10-30 | 2024-08-02 | 武汉国创科光电装备有限公司 | Electrofluidic array spray head for printing display device and spray printing equipment |
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| US5923346A (en) * | 1995-10-23 | 1999-07-13 | Imaging Technology International | Shadow pulse compensation of an ink jet printer |
| US6634730B2 (en) * | 2000-03-28 | 2003-10-21 | Canon Kabushiki Kaisha | Ink-jet printhead, printing apparatus having said printhead, and method of driving said printhead |
| JP4138592B2 (en) * | 2003-06-30 | 2008-08-27 | ブラザー工業株式会社 | Inkjet head and printing apparatus |
| JP2015189214A (en) * | 2014-03-28 | 2015-11-02 | セイコーエプソン株式会社 | Liquid injection head and liquid injection device |
| GB2539052B (en) * | 2015-06-05 | 2020-01-01 | Xaar Technology Ltd | Inkjet printhead |
| EP3299171B1 (en) * | 2015-06-29 | 2021-05-26 | Kyocera Corporation | Flow channel member, liquid-discharging head, and printing apparatus |
| GB2546097B (en) * | 2016-01-08 | 2020-12-30 | Xaar Technology Ltd | Droplet deposition head |
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