Porous individually addressable fluid ejection die and inkjet printing system

Abstract

This invention discloses a multi-hole independently controlled electrofluid printhead, comprising a main body, a base electrode, an ejection chip, and a control circuit board. A liquid storage cavity is formed at the bottom of the main body. The ejection chip is mounted at the bottom of the main body and includes multiple ejection holes, all of which communicate with the liquid storage cavity. An extraction electrode is arranged at each ejection hole of the ejection chip. The base electrode is arranged within the liquid storage cavity, and both the base electrode and the multiple extraction electrodes are electrically connected to the control circuit board located on the main body. Therefore, a base electric field is established between the base electrode and the substrate, bringing the functional liquid in the ejection holes to a critical ejection state. A regulating electric field is established between the extraction electrodes and the substrate, causing the functional liquid in the critical ejection state to be ejected. This reduces the voltage of the extraction electrodes at each ejection hole location, effectively reducing electric field crosstalk between ejection holes, facilitating independent control of multiple ejection holes, and ensuring printing accuracy. This invention also discloses an inkjet printing system.

Description

Technical Field

[0001] This invention relates to the field of inkjet printing technology, and in particular to a multi-hole independently controlled electro-hydraulic printhead and an inkjet printing system. Background Technology

[0002] Inkjet printing technology, as an additive manufacturing technology, has advantages such as non-contact, large area, no need for photomasks, rapid manufacturing, low cost of finished products, and direct pattern creation on flat / curved substrates. It is the main manufacturing technology for printed electronics that will replace the long process of photolithography / vacuum (development, etching, exposure and cleaning, etc.) and is widely used in display, sensing, chip, energy, aerospace and other fields.

[0003] Electrofluid inkjet printing technology uses an electric field to pull droplets out of the nozzle, making the diameter of the printed dots much smaller than the nozzle diameter. This reduces the diameter of the ejected droplets, meeting the printing requirements for higher pixel density and greatly improving printing resolution.

[0004] In related technologies, the substrate is grounded and a high voltage is applied at the nozzle position to form an electric field between the nozzle and the substrate. The electric field force is used to pull the functional liquid out of the nozzle to achieve the spraying of the functional liquid.

[0005] However, a relatively high voltage is required to eject the functional fluid from the nozzles. However, the multiple nozzles of the printhead are arranged in an array with small spacing between them. When a high voltage is applied, electric field crosstalk can easily occur between different nozzles, which can adversely affect printing accuracy. Furthermore, due to electric field crosstalk, it is difficult to control the nozzles independently, making it difficult to manufacture multi-nozzle electrofluid printheads. Summary of the Invention

[0006] One objective of this invention is to provide a multi-orifice independently controlled electrofluid printhead that can avoid electric field crosstalk between nozzles, thereby solving the technical problem in related technologies where the nozzle spacing is too small and electric field crosstalk between nozzles has an adverse effect on printing accuracy and printing control, making it difficult to manufacture multi-orifice electrofluid printheads.

[0007] One objective of this invention is to provide an inkjet printing system that can avoid electric field crosstalk between nozzles, thereby solving the technical problem in related technologies where excessively small nozzle spacing and electric field crosstalk between nozzles have adverse effects on printing accuracy and printing control, making it difficult to manufacture multi-nozzle electro-hydraulic printheads.

[0008] To achieve the above objectives, the technical solution of the present invention is as follows: A multi-hole independently controlled electrofluid nozzle is provided, comprising a main body, a base electrode, a spraying chip, and a control circuit board; a liquid storage cavity penetrating the bottom surface of the main body is provided; the base electrode is arranged within the liquid storage cavity; the spraying chip is mounted on the bottom surface of the main body, the spraying chip comprising multiple spray holes and multiple extraction electrodes, all of the multiple spray holes being connected to the liquid storage cavity, and each spray hole having an extraction electrode; the control circuit board is connected to the main body, and the control circuit board is electrically connected to the base electrode and the multiple extraction electrodes; wherein, a basic electric field is established between the base electrode and the substrate, the basic electric field causing the functional liquid in the spray holes to be in a critical spraying state; and a regulating electric field is established between the extraction electrodes and the substrate, the regulating electric field causing the functional liquid in the spray holes to be sprayed out from the critical spraying state.

[0009] In some embodiments, the base electrode includes an electrode wire arranged within the liquid reservoir, and the orthographic projection of the electrode wire onto the upper surface of the jet chip is located at the center of the region where all the jet holes are located.

[0010] In some embodiments, the plurality of jet holes are arranged in multiple rows, and the length direction of the electrode wire is consistent with the length direction of each row of jet holes.

[0011] In some embodiments, the top wall of the liquid storage cavity is provided with a positioning groove, the length direction of which is consistent with the arrangement direction of each row of injection holes, and the electrode wire is embedded in the positioning groove.

[0012] In some embodiments, the base electrode further includes leads, both ends of the electrode wire are connected to the leads, and both leads extend above the main body and are electrically connected to the control circuit board.

[0013] In some embodiments, the multi-hole independently controlled electro-hydraulic nozzle further includes a flow channel plate, on which a flow channel is formed penetrating its top and bottom surfaces. The top surface of the flow channel plate is attached to the bottom surface of the main body, and the flow channel plate covers the bottom opening of the liquid storage cavity. The flow channel is connected to the liquid storage cavity. The spray chip is fixed to the bottom surface of the flow channel plate, and the plurality of spray holes are all connected to the flow channel.

[0014] In some embodiments, the bottom surface of the main body is further provided with multiple annular grooves, which are filled with adhesive to bond the main body and the flow channel plate together.

[0015] In some embodiments, the bottom surface of the main body is further provided with a first sinking groove, the flow channel plate is embedded in the first sinking groove, and the bottom surface of the flow channel plate is flush with the bottom surface of the main body.

[0016] In some embodiments, the bottom surface of the flow channel plate is provided with a second recessed groove, the spray chip is embedded in the second recessed groove, and the bottom surface of the spray chip is flush with the bottom surface of the flow channel plate.

[0017] In some embodiments, the bottom end of the control circuit board is bent to form an electrical connection portion, which is attached to the bottom surface of the jetting chip for electrical connection with the jetting chip.

[0018] In some embodiments, the multi-hole independently controlled electro-hydraulic nozzle further includes a mounting portion fixed to the top of the main body, the mounting portion being used to fix the control circuit board.

[0019] In some embodiments, wiring grooves are provided on both opposite sides of the mounting portion, and the leads electrically connected to the base electrode are embedded in the wiring grooves, which guide the leads to connect to the control circuit board.

[0020] In some embodiments, the multi-hole independently controlled electro-hydraulic nozzle further includes an inlet pipe and an outlet pipe, both of which extend from the top of the main body into the liquid storage cavity, and are arranged near opposite ends of the liquid storage cavity.

[0021] Compared with related technologies, the multi-orifice independently controlled electrohydrodynamic nozzle of this invention establishes a basic electric field by setting a basic electrode in the liquid storage chamber, so that the functional liquid in all spray holes is uniformly in a critical spray state. Then, an extraction electrode independently arranged at each spray hole establishes a regulating electric field to precisely trigger the droplet ejection of specific spray holes. This dual-layer electric field architecture, which combines "basic electric field pre-activation and independent triggering by extraction electrodes", decomposes the single high voltage applied to the spray hole in the traditional solution into two functionally defined electric field components. This greatly reduces the voltage required to be applied at each spray hole, thus reducing electric field crosstalk between multiple spray holes. It facilitates precise independent control of multiple spray holes, and the spray timing, droplet volume, and flight trajectory of each spray hole can be precisely controlled, improving printing accuracy and laying a technical foundation for the large-scale array manufacturing of multi-orifice electrohydrodynamic nozzles.

[0022] Furthermore, by pre-establishing a basic electric field using the base electrode, the functional liquid is already in a critical spraying state, and the extraction electrode only needs to provide a small control voltage to achieve precise spraying. This design significantly reduces the operating voltage requirement of a single extraction electrode, which not only reduces the design difficulty and insulation requirements of the high-voltage circuit, but also significantly improves the electrical safety and long-term operational reliability of the system, while reducing the design difficulty, power consumption, and cost of the control circuit.

[0023] In another aspect, the present invention provides an inkjet printing system comprising a multi-hole independently controlled electro-hydraulic printhead as described above.

[0024] The inkjet printing system in this application includes a multi-hole independently controlled electro-hydraulic nozzle as described above. Therefore, the beneficial effects of the inkjet printing system are the same as those of the multi-hole independently controlled electro-hydraulic nozzle, and will not be repeated here. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the multi-hole independently controlled electro-hydraulic nozzle of the present invention; Figure 2 yes Figure 1 A schematic diagram showing the structure after the protective shell has been removed; Figure 3 yes Figure 1 Exploded view; Figure 4 yes Figure 2 Exploded view; Figure 5 yes Figure 4 Internal schematic diagram of the main body; Figure 6 yes Figure 4 A partially enlarged schematic diagram of the jetting chip.

[0027] [Symbol Explanation] 1. Main body; 1a. Liquid storage chamber; 1b. Positioning groove; 1c. Annular groove; 1d. First sinking groove; 2. Spraying chip; 2a. Spraying hole; 21. Extraction electrode; 3. Base electrode; 31. Electrode wire; 32. Lead wire; 4. Mounting part; 4a. Wiring groove; 5. Control circuit board; 6. Flow channel plate; 6a. Flow channel; 6b. Second sinking groove; 71. Liquid inlet pipe; 72. Liquid outlet pipe; 8. Protective shell Detailed Implementation Embodiments of the present invention will now be described with reference to the accompanying drawings, in which similar element reference numerals represent similar elements. It should be noted that the directional descriptions involved in the present invention, such as up, down, left, right, front, and rear, indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings and are only for the convenience of describing the technical solutions of this application or / and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "first," "second," etc., described are only used to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0028] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0029] First combine Figures 1-4 As shown, the multi-orifice independently controlled fluid printhead and inkjet printing system provided in this application effectively reduces the electric field crosstalk problem between nozzles by arranging base electrodes to reduce the voltage of the extraction electrodes at each nozzle position. This facilitates independent control of multiple nozzles and ensures printing accuracy. This application solves the technical problems of excessively small nozzle spacing and electric field crosstalk between nozzles in related technologies, thereby addressing the technical problem that electric field crosstalk has an adverse effect on printing accuracy and printing control, making it difficult to manufacture multi-orifice fluid printheads.

[0030] Let's combine the following... Figures 3-4 As shown, in one embodiment of this application, the provided multi-hole independently controlled electro-hydraulic nozzle includes a main body 1, an injection chip 2, a base electrode 3, and a control circuit board 5. The injection chip 2, the base electrode 3, and the control circuit board 5 are all mounted on the main body 1.

[0031] The following is combined with Figures 4-6As shown, in one embodiment of this application, a liquid storage cavity 1a is provided at the bottom of the main body 1, with the bottom opening of the liquid storage cavity 1a extending through the bottom surface of the main body 1. A spraying chip 2 is mounted on the bottom surface of the main body 1 and covers the bottom opening of the liquid storage cavity 1a. The spraying chip 2 includes multiple spray holes 2a and multiple extraction electrodes 21. Each spray hole 2a is connected to the liquid storage cavity 1a, and an extraction electrode 21 is arranged at each liquid storage cavity 1a. A base electrode 3 is arranged inside the liquid storage cavity 1a. The base electrode 3 and the multiple extraction electrodes 21 are all connected to the control circuit board 5. Thus, a basic electric field is established between the base electrode 3 and the substrate, causing the functional liquid in the spray holes 2a of the chip to be in a critical spraying state. A regulating electric field is then established between the extraction electrodes 21 and the substrate, causing the functional liquid in the critical spraying state to be ejected.

[0032] In this application, a basic electric field is established by setting a basic electrode 3 in the liquid storage chamber 1a, so that the functional liquid in all the spray holes 2a is uniformly in a critical spray state. Then, an extraction electrode 21 independently arranged at each spray hole 2a is used to establish a control electric field, thereby precisely triggering the droplet spray of a specific spray hole 2a. This dual-layer electric field architecture, which combines "basic electric field pre-activation + independent triggering by extraction electrode 21", decomposes the single high voltage applied to the spray hole 2a in the traditional solution into two functionally defined electric field components, which greatly reduces the voltage required to be applied at each spray hole 2a. Therefore, it reduces the electric field crosstalk between multiple spray holes 2a, which facilitates the precise independent control of multiple spray holes. The spray timing, droplet volume and flight trajectory of each spray hole can be precisely controlled, improving printing accuracy and laying the technical foundation for the large-scale array manufacturing of multi-orifice electrohydrodynamic printheads.

[0033] Furthermore, by using the base electrode 3 to pre-establish a basic electric field, the functional liquid is already in a critical spraying state. Therefore, the extraction electrode 21 only needs to provide a small regulating voltage to achieve precise spraying. This design significantly reduces the operating voltage requirement of a single extraction electrode 21, not only reducing the design difficulty and insulation requirements of the high-voltage circuit, but also significantly improving the electrical safety and long-term operational reliability of the system. Simultaneously, it reduces the design difficulty, power consumption, and cost of the control circuit.

[0034] The following is combined with Figure 4 , Figure 5 and Figure 6 As shown, in one embodiment of this application, multiple spray holes 2a are arranged in multiple rows on the spray chip 2 to form an array arrangement. More preferably, the spray holes 2a in different rows are arranged in an interpolated manner, that is, adjacent rows of spray holes 2a are staggered, wherein one row of spray holes 2a corresponds to the gap position of the adjacent row of spray holes 2a, such as... Figure 6As shown, this increases the printing density. Furthermore, it increases the spacing between the injection holes 2a, thereby increasing the spacing between the extraction electrodes 21 and further reducing electric field crosstalk.

[0035] Continue to combine Figure 4 , Figure 6 As shown, in one specific embodiment, the injection holes 2a are arranged in two rows, with the two rows of injection holes 2a staggered. However, this is not a limitation; in other embodiments, the injection holes 2a may be arranged in multiple rows, and the specific number of rows is not limited in this application.

[0036] The following is combined with Figures 5-6 As shown, in one embodiment of this application, the base electrode 3 includes an electrode wire 31, which is arranged within the liquid storage chamber 1a. More preferably, the orthographic projection of the electrode wire 31 onto the upper surface of the ejection chip 2 is located in the center of the area where all the ejection holes 2a are located. This arrangement of the electrode wire 31 ensures that the distance between all the ejection holes 2a and the electrode wire 31 is consistent, thereby guaranteeing that the functional liquid in all the ejection holes 2a experiences a consistent electric field force from the base electric field generated by the electrode wire 31. This ensures that the functional liquid in all the ejection holes 2a is in a critical ejection state, guaranteeing the printing consistency and control consistency of all the ejection holes 2a.

[0037] Continue to combine Figures 5-6 As shown, in a more preferred embodiment of this application, since the multiple injection holes 2a are arranged in multiple rows to form an array, the length direction of the electrode wire 31 is set to be consistent with the length direction of each row of injection holes 2a, and the orthographic projection of the electrode wire 31 on the upper surface of the injection chip 2 is located in the middle of the area where all the injection holes 2a are located, so that the electric field force from the basic electric field on the functional liquid in all the injection holes 2a is consistent.

[0038] For example, in Figure 5 and Figure 6 In one specific embodiment shown, two rows of injection holes 2a are arranged. Therefore, the orthographic projection of the electrode wire 31 on the upper surface of the injection chip 2 is located in the middle of the two rows of injection holes 2a, so that the electric field force from the basic electric field on the functional liquid in the two rows of injection holes 2a is consistent.

[0039] It should be noted that when there are two or more rows of jet holes 2a, the electric force experienced by the jet holes 2a located at the edges in the basic electric field generated by the electrode wire 31 may be slightly less than that in the jet holes 2a located in the center. However, since the spacing between the rows of jet holes 2a is very small, this difference in electric force is negligible. Furthermore, the basic electric field only needs to bring the functional liquid in the jet holes 2a to a critical jetting state, and does not need to be exactly the same. Therefore, the aforementioned difference in electric force can be ignored. Moreover, the slight difference in electric force between the rows of jet holes 2a caused by positional differences can also be adjusted by controlling the electric field to compensate for the aforementioned slight difference in electric force, thereby ensuring the printing consistency and control consistency of all jet holes 2a.

[0040] It is understandable that when there are two or more rows of spray holes 2a, the position and number of electrode wires 31 can be adjusted accordingly to ensure that the distance between all spray holes 2a and electrode wires 31 is consistent.

[0041] Continue reading Figure 5 As shown, in one embodiment of this application, a positioning groove 1b is provided on the top wall of the liquid storage chamber 1a. The length direction of the positioning groove 1b is consistent with the length direction of the arrangement of each row of injection holes 2a, and the electrode wire 31 is embedded in the positioning groove 1b. This arrangement, by arranging the positioning groove 1b, facilitates the positioning of the electrode wire 31, thereby ensuring the proper installation position of the electrode wire 31. This not only improves the assembly efficiency of the electrode wire 31 but also enhances its installation accuracy.

[0042] Continue reading Figure 5 As shown, in this embodiment, the base electrode 3 further includes lead wires 32, and both ends of the electrode wire 31 are connected to lead wires 32. Additionally, a wire hole extending through to the top of the main body 1 is provided on the top wall of the liquid storage chamber 1a. That is, the wire hole extends along the height direction of the main body 1 and penetrates the top surface of the main body 1 and the top wall of the liquid storage chamber 1a, thereby connecting the liquid storage chamber 1a. This allows the lead wire 32 to easily pass through the wire hole to the top of the main body 1 for lead-out. More preferably, the wire hole is sealed by injecting a sealing material such as sealant to prevent leakage. The wire hole and lead wire 32 allow for convenient electrical connection between the electrode wire 31 inside the liquid storage chamber 1a and the control circuit board 5, thereby enabling control of the electrode wire 31. Of course, the electrode wire 31 can also be electrically connected to the control circuit board 5 in other ways.

[0043] The following is combined with Figure 1-4 As shown, in one embodiment of this application, the multi-hole independently controlled electro-hydraulic nozzle further includes a mounting part 4, which is fixed to the top of the main body 1 and is used to fix the control circuit board 5.

[0044] Furthermore, wiring grooves 4a are provided on both opposite sides of the mounting part 4, see Figure 3 As shown, the lead wire 32 is embedded in the wiring groove 4a to guide the lead wire 32 to connect to the control circuit board 5. This arrangement, by arranging the wiring groove 4a, facilitates the installation and positioning of the lead wire 32, and facilitates the assembly of the lead wire 32.

[0045] Let's combine them again below. Figure 3-4 As shown, in one embodiment of this application, the multi-hole independently controlled electro-hydraulic nozzle further includes a flow channel plate 6. The flow channel plate 6 has a flow channel 6a extending through its top and bottom surfaces. The top surface of the flow channel plate 6 is attached to the bottom surface of the main body 1, and the flow channel plate 6 blocks the bottom opening of the liquid storage chamber 1a. The flow channel 6a is connected to the liquid storage chamber 1a. The spray chip 2 is fixed to the bottom surface of the flow channel plate 6, and multiple spray holes 2a are all connected to the flow channel 6a.

[0046] In this embodiment, by arranging the flow channel plate 6, the functional liquid in the liquid storage chamber 1a flows into the flow channel 6a, and then the functional liquid (e.g., ink supply) is supplied to the ejection holes 2a of the ejection chip 2. After the functional liquid enters the flow channel 6a from the liquid storage chamber 1a, it ensures that the flow channel 6a is in a full state, and it is easy to ensure that the functional liquid height at each ejection hole 2a is consistent, thereby ensuring that the functional liquid at each ejection hole 2a is in the same state, so as to ensure printing consistency. Furthermore, by filling the flow channel 6a, air bubbles are prevented from entering the ejection holes 2a and adversely affecting printing.

[0047] Furthermore, by arranging the flow channel plate 6, which can be detached from the main body 1, the same main body 1 can be used with different flow channel plates 6. When the required shape and size of the flow channel 6a are different, the flow channel plate 6 can be replaced. Therefore, the flexibility of the nozzle is improved, making it easier to manufacture nozzles that meet different needs.

[0048] Let's combine them again below. Figure 3-4 As shown, in one embodiment of this application, a first recessed groove 1d is further formed on the bottom surface of the main body 1, and the flow channel plate 6 is embedded in the first recessed groove 1d, with the bottom surface of the flow channel plate 6 flush with the bottom surface of the main body 1. This arrangement facilitates the positioning of the flow channel plate 6 by arranging the first recessed groove 1d, and also improves the overall integrity of the main body 1 and the flow channel plate 6.

[0049] Combination Figure 4 , Figure 5As shown, in one embodiment, the bottom surface of the main body 1 is further provided with multiple annular grooves 1c, which are suitable for being filled with adhesive materials such as adhesive. This arrangement ensures that the flow channel plate 6 is firmly adhered and fixed to the bottom surface of the main body 1 by filling the annular grooves 1c with adhesive materials such as adhesive, and guarantees that there are no gaps between the main body 1 and the flow channel plate 6, thus preventing leakage between the main body 1 and the flow channel plate 6 and ensuring the sealing of the liquid storage chamber 1a.

[0050] Continue to combine Figure 3-4 As shown, in another embodiment of this application, a second recessed groove 6b is formed on the bottom surface of the flow channel plate 6, and the spray chip 2 is embedded in the second recessed groove 6b, with the bottom surface of the spray chip 2 flush with the bottom surface of the flow channel plate 6. Specifically, the spray chip 2 is bonded and fixed to the flow channel plate 6 to increase the integrity of the spray chip 2, the flow channel plate 6, and the main body 1.

[0051] In a more preferred embodiment of this application, a first sinking groove 1d and a second sinking groove 6b are provided simultaneously, so that the bottom surface of the spray chip 2 is flush with the bottom surface of the main body 1. This shortens the distance from the liquid storage chamber 1a to the spray hole 2a and reduces the overall height of the multi-hole independently controlled electro-hydraulic nozzle.

[0052] Combined again Figure 3-4 As shown, in one embodiment of this application, the bottom end of the control circuit board 5 is bent to form an electrical connection portion, and the electrical connection portion is attached to the bottom surface of the spray chip 2 to be electrically connected to the spray chip 2, thereby making the electrical connection between the two more stable and easier to control the spray chip 2.

[0053] In a more preferred embodiment, the arrangement of the first sinking groove 1d and the second sinking groove 6b makes the bottom surface of the spray chip 2 flush with the bottom surface of the main body 1, thereby bringing the spray chip 2 closer to the main body 1. This reduces the downward extension length of the control circuit board 5, making it easier to install the control circuit board 5 and facilitates the electrical connection between the control circuit board 5 and the spray chip 2.

[0054] Combined again Figure 1-2 As shown, in one specific embodiment of this application, since the spray holes 2a are arranged in two rows, two control circuit boards 5 are correspondingly provided. The two control circuit boards 5 are respectively installed on opposite sides of the main body 1, and the electrical connection part of each control circuit board 5 is bent and attached to the bottom surface of the spray chip 2. Each control circuit board 5 controls one row of spray holes 2a. This arrangement reduces the control pressure of a single control circuit board 5 and makes it easier to arrange more spray holes 2a.

[0055] See again Figure 3As shown, in one embodiment of this application, the multi-hole independently controlled electro-hydraulic printhead may further include an inlet pipe 71 and an outlet pipe 72. Both the inlet pipe 71 and the outlet pipe 72 extend from the top of the main body 1 into the liquid storage chamber 1a, and are respectively arranged near opposite sides of the liquid storage chamber 1a. This arrangement allows the inlet pipe 71 to supply functional liquid to the liquid storage chamber 1a, and the functional liquid in the liquid storage chamber 1a can flow out through the outlet pipe 72. This achieves circulation of the functional liquid in the liquid storage chamber 1a, preventing sedimentation or even blockage of the flow channel 6a due to stagnation, and reducing air bubbles in the functional liquid. This ensures normal ink supply and guarantees print quality.

[0056] The following is combined with Figure 1 , Figure 3 As shown, in one embodiment of this application, the multi-hole independently controlled electro-hydraulic nozzle also includes a protective shell 8, which covers the main body 1 and the mounting part 4. The bottom opening of the protective shell 8 is arranged so that the flow channel plate 6, the spray chip 2 and the electrical connection part of the control circuit board 5 are exposed in the protective shell 8, thereby protecting the main body 1 and the mounting part 4 without interfering with the operation of the multi-hole independently controlled electro-hydraulic nozzle.

[0057] Combined again Figures 1-6 As shown, in one embodiment of this application, an inkjet printing system is also provided, including the multi-hole independently controlled electro-hydraulic printhead described above. The structures of the other parts of the inkjet printing system are conventional structures in the art, and therefore will not be described in detail.

[0058] In summary, the multi-orifice independently controlled electrohydrodynamic nozzle provided in this application establishes a basic electric field by setting a basic electrode 3 in the liquid storage chamber 1a, thereby uniformly bringing the functional liquid in all spray holes 2a to a critical spray state. Then, an extraction electrode 21 independently arranged at each spray hole 2a establishes a regulating electric field, thereby precisely triggering the droplet spraying of a specific spray hole 2a. This dual-layer electric field architecture, combining "basic electric field pre-activation + independent triggering by extraction electrode 21," decomposes the single high voltage applied to the spray hole 2a in the traditional scheme into two functionally defined electric field components, greatly reducing the voltage required to be applied at each spray hole 2a. Therefore, it reduces electric field crosstalk between multiple spray holes 2a, facilitating precise independent control of multiple spray holes. The spraying timing, droplet volume, and flight trajectory of each spray hole can be precisely controlled, improving printing accuracy and laying a technical foundation for the large-scale array manufacturing of multi-orifice electrohydrodynamic nozzles.

[0059] Furthermore, since a basic electric field is pre-established using the base electrode 3, the functional liquid is already in a critical spraying state. Therefore, the extraction electrode 21 only needs to provide a small control voltage to achieve precise spraying. This design significantly reduces the operating voltage requirement of a single extraction electrode 21, which not only reduces the design difficulty and insulation requirements of the high-voltage circuit, but also significantly improves the electrical safety and long-term operational reliability of the system, while reducing the design difficulty, power consumption, and cost of the control circuit.

[0060] The inkjet printing system provided in this application includes a multi-hole independently controlled current fluid printhead as described above. Therefore, the beneficial effects of the inkjet printing system are the same as those of the multi-hole independently controlled current fluid printhead, and will not be repeated here.

[0061] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0062] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0063] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A multi-hole independently controlled electrofluid nozzle, characterized in that, include: The main body has a liquid storage cavity at its bottom; A base electrode is arranged within the liquid storage chamber; A jetting chip is mounted on the bottom surface of the main body. The jetting chip includes multiple jetting holes and multiple extraction electrodes. Each of the multiple jetting holes is connected to the liquid storage chamber, and an extraction electrode is arranged at each of the jetting holes. A control circuit board is connected to the main body and is electrically connected to the base electrode and the plurality of extraction electrodes. Specifically, a basic electric field is established between the basic electrode and the substrate, which causes the functional liquid in the injection hole to be in a critical injection state. A regulating electric field is established between the extraction electrode and the substrate, which causes the functional liquid in the injection hole to be ejected from the critical injection state.

2. The multi-hole independently controlled electro-hydraulic nozzle as described in claim 1, characterized in that, The base electrode includes an electrode wire arranged in the liquid storage cavity. The plurality of spray holes are arranged in multiple rows, and the length direction of the electrode wire is consistent with the length direction of all the spray holes. The orthographic projection of the electrode wire on the upper surface of the spray chip is located in the middle of the area where all the spray holes are located.

3. The multi-hole independently controlled electro-hydraulic nozzle as described in claim 2, characterized in that, The top wall of the liquid storage chamber is provided with a positioning groove, the length direction of which is consistent with the arrangement direction of each row of injection holes, and the electrode wire is embedded in the positioning groove.

4. The multi-hole independently controlled electro-hydraulic nozzle as described in claim 1, characterized in that, It also includes a flow channel plate, on which a flow channel is formed through its top and bottom surfaces. The top surface of the flow channel plate is attached to the bottom surface of the main body, and the flow channel plate covers the bottom opening of the liquid storage cavity. The flow channel is connected to the liquid storage cavity. The spray chip is fixed to the bottom surface of the flow channel plate, and the plurality of spray holes are all connected to the flow channel.

5. The multi-hole independently controlled electro-hydraulic nozzle as described in claim 4, characterized in that, The bottom surface of the main body is also provided with multiple annular grooves, which are filled with adhesive to bond the main body and the flow channel plate together.

6. The multi-hole independently controlled electro-hydraulic nozzle as described in claim 4, characterized in that, The bottom surface of the main body is further provided with a first recessed groove, and the flow channel plate is embedded in the first recessed groove, with the bottom surface of the flow channel plate flush with the bottom surface of the main body; or / and, The bottom surface of the flow channel plate is provided with a second sinking groove, the spray chip is embedded in the second sinking groove, and the bottom surface of the spray chip is flush with the bottom surface of the flow channel plate.

7. The multi-hole independently controlled electro-hydraulic nozzle as described in claim 1 or 6, characterized in that, The bottom end of the control circuit board is bent to form an electrical connection portion, which is attached to the bottom surface of the spray chip for electrical connection with the spray chip.

8. The multi-hole independently controlled electro-hydraulic nozzle as described in claim 2, characterized in that, The base electrode also includes leads, both ends of which are connected to the leads, and both leads extend above the main body and are electrically connected to the control circuit board.

9. The multi-hole independently controlled electro-hydraulic nozzle as described in claim 8, characterized in that, It also includes a mounting part, which is fixed to the top of the main body and is used to fix the control circuit board. The mounting part has wiring grooves on both opposite sides, and the lead wires that are electrically connected to the base electrode are embedded in the wiring grooves. The wiring grooves guide the lead wires to connect to the control circuit board.

10. An inkjet printing system, characterized in that, Includes the multi-hole independently controlled electro-hydraulic nozzle as described in any one of claims 1 to 9.

Images