CN117162669A - An electrofluid jet printing head and an electrofluid jet printing device - Google Patents
An electrofluid jet printing head and an electrofluid jet printing device Download PDFInfo
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- CN117162669A CN117162669A CN202311211625.8A CN202311211625A CN117162669A CN 117162669 A CN117162669 A CN 117162669A CN 202311211625 A CN202311211625 A CN 202311211625A CN 117162669 A CN117162669 A CN 117162669A
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Abstract
本发明公开了一种电流体喷印头和电流体喷印装置。该电流体喷印头包括：绝缘基底、多个第一电极和多个第二电极，第一电极和第二电极设置于绝缘基底相对设置的两侧表面；绝缘基底包括贯穿绝缘基底的多个基底过孔；第一电极包括与基底过孔对应的第一通孔，第二电极包括与基底过孔对应的第二通孔；第一电极和第二电极用于在基底过孔两端形成电场使得电流体喷印头中的打印介质从基底过孔喷射。本发明的技术方案，通过在绝缘基底中设置多个基底过孔，在基底过孔两端形成电场使得电流体喷印头中的打印介质从基底过孔中形成泰勒锥喷射，防止基底过孔之间存在电场串扰的问题，保证电流体喷印头在强电场下运行的可靠性。
The invention discloses an electrofluid jet printing head and an electrofluid jet printing device. The electrofluid print head includes: an insulating base, a plurality of first electrodes and a plurality of second electrodes. The first electrodes and the second electrodes are arranged on opposite side surfaces of the insulating base; the insulating base includes a plurality of electrodes penetrating the insulating base. The base via hole; the first electrode includes a first through hole corresponding to the base through hole, and the second electrode includes a second through hole corresponding to the base through hole; the first electrode and the second electrode are used to form at both ends of the base through hole The electric field causes the print media in the electrofluidic printhead to eject from the substrate via holes. The technical solution of the present invention is to provide a plurality of substrate via holes in the insulating substrate, and form an electric field at both ends of the substrate via hole so that the printing medium in the electrofluidic print head forms a Taylor cone ejection from the substrate via hole, thereby preventing the substrate via hole. There is the problem of electric field crosstalk between them to ensure the reliability of the operation of the electrofluid printhead under strong electric fields.
Description
Technical Field
The invention relates to the technical field of ink-jet printing, in particular to an electrofluidic spray printing head and an electrofluidic spray printing device.
Background
Currently commercially available array inkjet printing heads are mainly piezoelectric and thermal bubble type. The two types of spray heads respectively use extrusion force generated by bubble expansion generated by piezoelectric ceramic vibration or local heating as driving force to extrude ink from a spray nozzle. The liquid drops ejected by the two types of spray heads are generally equivalent to the diameter of the spray nozzle under the limitation of the action principle of the extrusion force. With the reduction of the caliber of the nozzle, the viscosity and the surface tension of the ink to be overcome are increased, so that the printing resolution is low, the application range of the viscosity of the ink is narrow, and the like.
The electrofluid jet printing technology is another technology with very good application prospect, and the principle is that the meniscus at the nozzle is deformed into a taylor cone under the action of a strong electric field by applying high voltage between the nozzle and a substrate, and drops with the size far smaller than that of the nozzle are ejected from the cone tip. Like conventional spray heads, electrofluidic spray printing must be arrayed to accommodate large-scale industrial applications. However, the array type electrofluidic spray head in the prior art has the problems of complex structure, difficult manufacture and difficult overcoming of the crosstalk between the nozzles.
Disclosure of Invention
The invention provides an electrofluidic spray printing head and an electrofluidic spray printing device, which are used for solving the problems that the electrofluidic spray printing head in the prior art is complex in structure and easy to cause crosstalk in nozzles.
According to an aspect of the present invention, there is provided an electrofluidic inkjet printhead comprising:
the device comprises an insulating substrate, a plurality of first electrodes and a plurality of second electrodes, wherein the first electrodes and the second electrodes are arranged on two side surfaces of the insulating substrate which are oppositely arranged;
the insulating substrate comprises a plurality of substrate vias penetrating through the insulating substrate;
the first electrode comprises a first through hole corresponding to the substrate through hole, and the second electrode comprises a second through hole corresponding to the substrate through hole;
the first electrode and the second electrode are used for forming an electric field at two ends of the substrate via hole so that the printing medium in the electrofluidic jet printing head is ejected from the substrate via hole.
Alternatively, the insulating substrate includes a polyimide substrate.
Optionally, the electrofluidic inkjet head further comprises a conical nozzle;
the tapered nozzle is disposed in the base via.
Optionally, the first electrode comprises a surrounding subsection and a connecting subsection;
the surrounding part is connected with the connecting part, the surrounding part comprises a first through hole, and the connecting part is used for being electrically connected with a driving power supply.
Optionally, a plurality of connection branches are used for electrically connecting with the same driving power source.
Optionally, the plurality of second electrodes are connected to each other and electrically connected to a driving power source.
Optionally, the electrofluidic inkjet printhead further comprises a plurality of switching devices;
the switching device is arranged in series in a loop between the first electrode and the second electrode.
Optionally, each switch unit is electrically connected to one first electrode and one second electrode;
alternatively, each switching unit is electrically connected to at least two first electrodes and at least two second electrodes.
According to another aspect of the present invention, there is provided an electrofluidic inkjet printing apparatus comprising an electrofluidic inkjet printhead;
further comprises: an ink chamber;
the ink cavity is arranged on one side of the second electrode far away from the insulating substrate, a printing medium is stored in the ink cavity, an ink cavity opening is formed in the surface of the ink cavity, and the ink cavity opening is communicated with the substrate through hole.
Optionally, the electrofluidic inkjet printing apparatus further comprises: a porous membrane layer;
the porous membrane layer is disposed between the ink chamber and the second electrode.
According to the technical scheme, the plurality of substrate through holes are arranged in the insulating substrate, the plurality of substrate through holes are arrayed in the insulating substrate, the substrate through holes are isolated through the insulating substrate, the first electrode and the second electrode are respectively arranged at the two ends of each substrate through hole, and the electric field is formed at the two ends of each substrate through hole, so that the printing medium in the electrofluid jet printing head forms Taylor cone jet from the substrate through holes, the electrofluid jet printing head is integrated in the insulating substrate while jet printing is guaranteed, the problem of electric field crosstalk between the substrate through holes is prevented, and the reliability of operation of the electrofluid jet printing head under a strong electric field is guaranteed.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a first electrofluidic printhead according to an embodiment of the present invention;
FIG. 2 is a schematic top view of an electrofluidic printhead according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a second electrode according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of FIG. 2 taken along section line A-A';
FIG. 5 is an enlarged schematic view of FIG. 4 at B;
FIG. 6 is a schematic diagram of a second electrofluidic printhead according to an embodiment of the present invention;
fig. 7 is a schematic operation diagram of an electrofluidic printhead according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein.
Fig. 1 is a schematic structural view of a first electrofluidic printhead according to an embodiment of the present invention, fig. 2 is a schematic structural view of an electrofluidic printhead according to an embodiment of the present invention, fig. 3 is a schematic structural view of a second electrode according to an embodiment of the present invention, fig. 4 is a schematic structural view of a section line A-A' in fig. 2, and the electrofluidic printhead according to the embodiment is applicable to an inkjet printing scene, as shown in fig. 1, 2, 3 and 4, and includes:
the device comprises an insulating substrate 1, a plurality of first electrodes 2 and a plurality of second electrodes 3, wherein the first electrodes 2 and the second electrodes 3 are arranged on two side surfaces of the insulating substrate 1 which are oppositely arranged;
the insulating substrate 1 includes a plurality of substrate vias 11 penetrating the insulating substrate 1;
the first electrode 2 includes a first via 21 corresponding to the base via 11, and the second electrode 3 includes a second via 31 corresponding to the base via 11;
the first electrode 2 and the second electrode 3 are used to form an electric field across the substrate via 11 so that the print medium in the electrofluidic inkjet printhead is ejected from the substrate via 11.
The insulating substrate 1 may be a thin film substrate made of a material with good insulation property, a plurality of substrate vias 11 are provided in the insulating substrate 1, the plurality of substrate vias 11 may be arranged in the insulating substrate 1 in an array, the substrate vias 11 are isolated by the insulating substrate 1, and due to the good insulation property of the insulating substrate 1, the influence of electrical crosstalk between the substrate vias 11 can be reduced when the plurality of substrate vias 11 generate an electric field.
The substrate via 11 forms a first hole and a second hole on the surface of the insulating substrate 1, the printing medium spraying direction is set to be the y direction, the printing medium spraying direction is set to be the second hole pointing to the first hole direction, the first electrode 2 can be an extraction electrode of the electrofluid spraying printing head, the extraction electrode comprises first through holes 21 corresponding to the first holes, the extraction electrode is arranged on the surface of one side corresponding to the first holes of the insulating substrate 1, the first through holes 21 of each extraction electrode are arranged around the corresponding first holes, each first electrode 2 can comprise one first through hole 21, and the number of the first through holes 21 corresponds to the number of the first holes one by one; the second electrode 3 may be a conductive layer of the electrofluidic printhead, where the conductive layer includes second through holes 31 corresponding to the second holes, the conductive layer is disposed on a surface of the insulating substrate 1 corresponding to the second holes, the conductive layer may be disposed in a whole layer, and the conductive layer includes second through holes 31 corresponding to the second holes in number, where the second through holes 31 correspond to the second holes one to one. It is understood that the first electrode 2 and the second electrode 3 are both metal electrodes, for example, the material of the first electrode 2 may be a copper film. The first electrode 2 and the second electrode 3 are used for forming an electric field at two ends of the substrate via 11 when the first electrode 2 and the second electrode 3 are connected to form a loop, so that the printing medium in the substrate via 11 forms a taylor cone under the action of a strong electric field, and further ejection of the printing medium is realized.
In some embodiments, the central axis of the base via 11, the central axis of the first via 21, and the central axis of the second via 31 are collinear. Since the base via hole 11 corresponds to the ejection channel of the printing medium, the central axis of the base via hole 11, the central axis of the first through hole 21 and the central axis of the second through hole 31 are collinear, so that the symmetry of the taylor cone and the ejection flow can be improved, the integration level of the base via hole 11 is also improved, and the printing medium is suitable for large-scale integration.
Specifically, the spray printing mode of the electrofluidic spray printing head is as follows: the first electrode 2 and the second electrode 3 are respectively connected with the positive electrode and the negative electrode of the power supply to form a loop. When the power supply is not turned on, the loop is not turned on, the first electrode 2 is in a suspension state, no electric field exists between the first electrode 2 and the second electrode 3, and Taylor cone injection cannot be formed in the substrate via hole 11; when the power is turned on, the loop is turned on, a strong electric field exists between the first electrode 2 and the second electrode 3, and the printing medium forms a Taylor cone in the substrate via hole 11 and is sprayed, so that the jet printing of the electrofluid jet printing head is realized.
It can be understood that, in order to achieve better integration between the electrofluidic inkjet printheads of the array in the prior art, the distance between the electrofluidic inkjet printheads is reduced, and because the working scene of the electrofluidic inkjet printheads is a strong electric field environment, when the electrofluidic inkjet printheads work together or work alone, the printing medium has corresponding electrical properties, and the reduced space between the electrofluidic inkjet printheads can enable the printing medium between different electrofluidic inkjet printheads to generate electric field repulsive force, thereby affecting the collimation of the printing medium ejection. The dielectric constant of the insulating substrate 1 itself is low, and the insulating substrate 1 is filled between the substrate vias 11 to prevent crosstalk during operation between the electrofluidic inkjet printheads.
According to the technical scheme, the plurality of substrate through holes are arranged in the insulating substrate, the plurality of substrate through holes are arrayed in the insulating substrate, the substrate through holes are isolated through the insulating substrate, the first electrode and the second electrode are respectively arranged at the two ends of each substrate through hole, and the electric field is formed at the two ends of each substrate through hole, so that the printing medium in the electrofluid jet printing head forms Taylor cone jet from the substrate through holes, the electrofluid jet printing head is integrated in the insulating substrate while jet printing is guaranteed, the problem of electric field crosstalk between the substrate through holes is prevented, and the reliability of operation of the electrofluid jet printing head under a strong electric field is guaranteed.
Optionally, the insulating substrate includes a polyimide substrate (not shown).
The polyimide substrate has the advantages of good electrical insulation, strong high-temperature stability and easy processing.
Specifically, in the processing process of the electrofluidic jet printing head, the high-temperature liquid polyimide material can be injected into an injection molding grinding tool for compression molding, and a plurality of substrate via microstructures can be formed on the polyimide substrate in the forms of laser engraving, drilling and the like. Meanwhile, the polyimide substrate has high corrosion resistance, so the quality requirement on printing media is low; because the polyimide substrate has good high-temperature stability, the electrofluidic jet printing head can maintain good dimensional stability at high temperature, and is not easy to expand and shrink.
According to the technical scheme provided by the embodiment of the invention, the polyimide substrate is adopted, the problems of complex manufacture and low reliability of the electrofluidic inkjet printing head are solved by utilizing the properties of good electrical insulation property, strong high-temperature stability and easiness in processing of the polyimide material, the function of preventing crosstalk of the polyimide substrate is ensured, and the reliability of the electrofluidic inkjet printing head in working under a high-pressure environment is improved.
Optionally, fig. 5 is an enlarged schematic view of fig. 4 at B, and as shown in fig. 1, 2, 3, 4 and 5, the electrofluid jet printhead further includes a tapered nozzle 12 therein;
a cone nozzle 12 is provided in the base via 11.
Wherein the tapered nozzle 12 may be used to eject print media, the tapered nozzle 12 may include a second via extending through the tapered nozzle 12, the central axis of the second via being collinear with the central axis of the base via 11, the cross-sectional area of the tapered nozzle 12 perpendicular to the axis of the tapered nozzle 12 decreasing in the y-direction.
In some embodiments employing polyimide as the substrate, the high aspect ratio tapered nozzle 12 structure may be fabricated to a relatively high height above the capillary dimension. In the working process, even if a small amount of ink flows out of the conical nozzle 12, liquid drops can be formed under the action of the surface tension of the conical nozzle 12, the liquid drops are separated from the conical nozzle 12 to be wetted, the shape of the meniscus of the subsequent conical nozzle 12 and the formation of a Taylor cone are not influenced, and the printing precision of the electrofluid jet printing head is ensured.
According to the technical scheme provided by the embodiment of the invention, the conical nozzle structure is arranged in the substrate via hole, so that when a printing medium overflows under the action of gravity, liquid drops are formed to be separated from the nozzle under the action of capillary force at the tip of the conical nozzle, the shape and the injection of a meniscus are not influenced, the printing precision of the electrofluidic jet printing head is higher, the printing resolution is higher, and the application range is wider; the central axis of the second via hole is collinear with the central axis of the substrate via hole, so that the symmetry of the Taylor cone and the jet flow is improved, the integration level of the conical nozzle is improved, and the method is suitable for large-scale integration.
Optionally, with continued reference to fig. 1, 2, 3 and 4, the first electrode 2 comprises a surrounding subsection 22 and a connecting subsection 23;
the surrounding part 22 is connected to the connecting part 23, the surrounding part 22 comprising a first through hole 21, the connecting part 23 being adapted for electrical connection to a driving power source.
Wherein the surrounding subsections 22 are used to surround the first holes, one first hole for each surrounding subsection 22, or a plurality of first holes. The surrounding sub-section 22 is connected to the connection sub-section 23, the connection sub-section 23 is electrically connected to a driving power source, and the connection sub-section 23 is configured to supply power to the surrounding sub-section 22 by the driving power source, so that the surrounding sub-section 22 and the second electrode 3 cooperate to form an electric field between the substrate vias 11.
In some embodiments, the surrounding subsection 22 may be annular and the central axis around subsection 22 may be collinear with the central axis of the base via 11, improving the symmetry of the taylor cone and jet. Other shapes for the surrounding section 22 are possible, and the embodiment of the present invention is not limited thereto; the connection portion 23 may be an extension structure surrounding the portion 22, and the extension structure may be independently connected to a driving power source, or may be connected to the driving power source together to electrically connect the first electrode 2.
The first electrode 2 can be prepared by image transfer technologies such as direct-writing printing, screen printing and the like, is simple to process and low in cost, is convenient for mass production, and is convenient for being accurately matched with the substrate via 11.
In some embodiments, as shown in fig. 4, the electrofluid jet printing head further includes a second insulating substrate 10, where the second insulating substrate 10 is disposed on a side of the first electrode 2 away from the insulating substrate 1, and the second insulating substrate 10 further includes second substrate vias corresponding to the substrate vias 11 one by one, and a jet path of a printing medium is formed among the substrate vias 11, the first through holes 21 and the second substrate vias, so that the jet path of the printing medium is ensured, and meanwhile, the protection effect on the first electrode 2 is achieved, so that the electrofluid jet printing head is prevented from being scratched during the working process, and the normal working of the electrofluid jet printing head is affected.
According to the technical scheme provided by the embodiment of the invention, the first electrode is divided into the surrounding part and the connecting part, so that the surrounding part surrounds the substrate via hole, the connecting part is connected with the driving power supply, and the one-to-one correspondence between the substrate via hole and the surrounding part and the accurate matching between the substrate via hole and the first electrode are ensured.
Alternatively, as shown with continued reference to fig. 1, 2, 3 and 4, a plurality of connection branches 23 are provided for electrical connection to the same drive power source.
The first electrodes 2 may be non-entirely disposed on one side of the insulating substrate 1, a plurality of connection branches 23 may have a junction, the plurality of connection branches 23 are intersected at one place, the driving power source is directly electrically connected with the junction, when the driving power source is started, the driving power source can simultaneously supply power to the plurality of surrounding branches 22, so as to realize common control of the driving power source to the plurality of first electrodes 2, and realize on-off of voltage.
Alternatively, as shown with continued reference to fig. 1, 2, 3 and 4, the plurality of second electrodes 3 are connected to each other and electrically connected to a driving power source.
The second electrodes 3 can be arranged on one side of the insulating substrate 1 in a whole layer, and the arrangement can enable the second electrodes 3 to be connected with each other, so that the simultaneous control of a driving power supply is realized; the second through hole 31 on the second electrode 3, the first through hole 21 on the first electrode 2 and the substrate through hole 11 form a jet path of the printing medium, and the arrangement can avoid setting a corresponding driving power supply for the single second electrode 3, so that the structure of the electrofluid jet printing head is simplified, and the cost of the electrofluid jet printing device is saved.
In some embodiments, the second electrode 3 may be prepared by direct write printing, screen printing, or other image transfer techniques, which is simple to process and low in cost, facilitates mass production, and facilitates accurate matching with the substrate via 11.
Illustratively, when the driving power is started, the positive electrode and the negative electrode of the driving power are respectively connected with the first electrode 2 and the second electrode 3, and the first electrodes 2 are communicated with each other through the connection part 23, and the second electrodes 3 are also connected with each other, so that when the driving power is started, a strong electric field is generated at both sides of all substrate through holes 11, and the printing medium overcomes the surface tension of the meniscus to form a taylor cone for jet printing.
It should be understood that, in the embodiment of the present invention, the plurality of second electrodes 3 may also include a part of the second electrodes 3 instead of all the second electrodes 3, which may be determined according to the application scenario of the electronic fluid jet printing head, and the embodiment of the present invention is not limited thereto.
In some embodiments, fig. 6 is a schematic structural diagram of a second type of electrofluid jet printing head according to an embodiment of the present invention, as shown in fig. 6, the electrofluid jet printing head further includes an accelerating electrode 4, where the accelerating electrode 4 is also a metal electrode structure, and the accelerating electrode 4 is disposed on a side of the first electrode 2 away from the insulating substrate 1. After the printing medium passes through the first electrode 2, the printing medium is likely to be absorbed by the first electrode 2 due to the fact that charges between the printing medium and the first electrode 2 are opposite, and the accelerating electrode 4 with the same electrical property as the printing medium is arranged, so that repulsive force can be applied to the printing medium according to the principle that the same electrical property repels each other, the effect of accelerating the printing medium injection is achieved, meanwhile, the directivity of the printing medium injection is optimized, and the efficiency of the electrofluidic injection device is improved. It will be appreciated that the accelerator electrode 4 also has a power supply means electrically connected thereto to supply power to the accelerator electrode 4.
Optionally, fig. 7 is a schematic working diagram of an electrofluidic printhead according to an embodiment of the present invention, and as shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 7, the electrofluidic printhead further includes a plurality of switching devices 5;
the switching device 5 is arranged in series in the loop between the first electrode 2 and the second electrode 3.
The switching device 5 may be a relay or a field effect transistor commonly used in circuit connection, and is used for controlling the on-off of a loop between the first electrode 2 and the second electrode 3.
Specifically, the positive electrodes of the driving power supply 6 are connected with all the second electrodes 3, the driving power supply 6 simultaneously controls the on-off of the second electrodes 3, the negative electrodes of the driving power supply 6 are respectively connected with the corresponding first electrodes 2 through the switch equipment 5, the number of the first electrodes 2 and the number of the switch equipment 5 are in one-to-one correspondence, independent control of each first electrode 2 is achieved, namely, a loop corresponding to the substrate via holes 11 is formed among the driving power supply 6, the switch equipment 5, the first electrodes 2 and the second electrodes 3, and an electric field can be formed among the corresponding substrate via holes 11 only when the driving power supply 6 is started and the switch equipment 5 is closed, so that independent control of each substrate via hole 11 is achieved.
It can be understood that the driving power supply 6 is independently controlled for any one of the first electrode 2 and the second electrode 3, so that the independent control of the substrate via 11, that is, the independent control of the ejection of the electrofluid jet printing head, can be realized, and the application scene of the electrofluid jet printing head is enlarged. In some embodiments, each switching unit is electrically connected to one first electrode 2 and one second electrode 3; alternatively, each switching unit is electrically connected to at least two first electrodes 2 and at least two second electrodes 3. I.e. the switching unit can be arranged on the loop of each first electrode 2 and each second electrode 3, so as to realize independent control of each substrate via 11; the switching unit may be disposed on the loops of the plurality of first electrodes 2 and the plurality of second electrodes 3, so as to realize independent control of the plurality of substrate vias 11, which is not limited in the embodiment of the present invention.
According to the technical scheme, the switching equipment which corresponds to the substrate through holes one by one is arranged in the loop of the first electrode and the loop of the second electrode on the basis of not additionally arranging the driving power supply, and the independent control of the substrate through holes is realized by controlling the switching-on and switching-off of the switching equipment, so that a plurality of independent driving power supplies are not required to be arranged, and the complexity and the cost of a system are reduced.
Based on the same inventive concept, the embodiment of the invention further provides an electrofluidic inkjet printing device, which is shown in fig. 1, 2, 3, 4 and 7, and comprises an electrofluidic inkjet printing head;
further comprises: an ink chamber 7;
the ink chamber 7 is provided on the side of the second electrode 3 remote from the insulating substrate 1, a printing medium is stored in the ink chamber 7, and an ink chamber 7 opening is provided on the surface of the ink chamber 7, the ink chamber 7 opening communicating with the substrate via 11.
The ink chamber 7 may be used to store a printing medium, which may be ink or other printing solutions, which is not limited in this embodiment of the present invention. The ink chamber 7 opening in the ink chamber 7 communicates with the substrate via 11 for supplying print medium into the substrate via 11.
In some embodiments, the pressure in the ink chamber 7 is defined to be slightly below ambient air pressure so that the liquid within the meniscus of the substrate vias 11 remains in a slightly negative pressure state, preventing the print medium from spilling out of the substrate vias 11 when no electric field is applied between the substrate vias 11; when a voltage is applied between the substrate vias 11, the meniscus deforms to form a taylor cone, the electric field force is greater than the surface tension, and the print medium achieves spontaneous flow under the effect of the electric field force without an additional ink supply pump.
According to the technical scheme provided by the embodiment of the invention, the ink cavity is arranged in the electrofluidic jet printing device, no additional ink supply equipment is needed, the flow and the supply of the printing medium are realized by using the strong electric field between the substrate through holes, the cost of the electrofluidic jet printing device is simplified, and the precision of the electrofluidic jet printing device is ensured.
Optionally, with continued reference to fig. 1, 2, 3, 4 and 7, the electrofluidic inkjet printing apparatus further includes: a porous membrane layer 8;
a porous membrane layer 8 is provided between the ink chamber 7 and the second electrode 3.
Wherein, porous membrane layer 8 sets up between ink chamber 7 and second electrode 3, when printing medium sprays to porous membrane layer 8 at base via hole 11, porous membrane layer 8 can play the effect that increases the flow resistance, improves the homogeneity of printing medium distribution between base via hole 11 for the shape of every meniscus is more unanimous, prevents when the operation of independent base via hole 11, and adjacent base via hole 11 forms the flow crosstalk to operation base via hole 11, improves the accuracy of electric fluid jet printing device jet printing.
In addition, the porous membrane layer 8 also has a filtering effect, so that tiny particles in the printing medium are prevented from affecting the accuracy of jet printing.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. An electrofluidic printhead, comprising:
the device comprises an insulating substrate, a plurality of first electrodes and a plurality of second electrodes, wherein the first electrodes and the second electrodes are arranged on two side surfaces of the insulating substrate which are oppositely arranged;
the insulating substrate comprises a plurality of substrate vias penetrating through the insulating substrate;
the first electrode comprises a first through hole corresponding to the substrate through hole, and the second electrode comprises a second through hole corresponding to the substrate through hole;
the first electrode and the second electrode are used for forming an electric field at two ends of the substrate via hole so that the printing medium in the electrofluidic jet printing head is ejected from the substrate via hole.
2. The electrofluidic printhead of claim 1, wherein the insulating substrate comprises a polyimide substrate.
3. The electrofluidic printhead of claim 1, further comprising a tapered nozzle therein;
the tapered nozzle is disposed in the base via.
4. The electrofluidic printhead of claim 1, wherein the first electrode comprises a surrounding section and a connecting section;
the surrounding part is connected with the connecting part, the surrounding part comprises the first through hole, and the connecting part is used for being electrically connected with a driving power supply.
5. The electrofluidic printhead of claim 4, wherein a plurality of the connection segments are configured to electrically connect to the same drive power source.
6. The electrofluidic printhead of claim 1, wherein a plurality of the second electrodes are connected to each other and to a drive power supply.
7. The electrofluidic printhead of claim 1, further comprising a plurality of switching devices;
the switching device is arranged in series in a loop between the first electrode and the second electrode.
8. The electrofluidic printhead of claim 7, wherein each of said switching cells is electrically connected to one of said first electrodes and one of said second electrodes;
alternatively, each of the switching units is electrically connected to at least two of the first electrodes and at least two of the second electrodes.
9. An electrofluidic inkjet printing apparatus comprising an electrofluidic inkjet printhead according to any one of claims 1 to 8;
further comprises: an ink chamber;
the ink cavity is arranged on one side, far away from the insulating substrate, of the second electrode, printing media are stored in the ink cavity, an ink cavity opening is formed in the surface of the ink cavity, and the ink cavity opening is communicated with the substrate through hole.
10. The electrofluidic inkjet printing apparatus of claim 9, further comprising: a porous membrane layer;
the porous membrane layer is disposed between the ink chamber and the second electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311211625.8A CN117162669B (en) | 2023-09-19 | A current-current inkjet printhead and a current-current inkjet printing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311211625.8A CN117162669B (en) | 2023-09-19 | A current-current inkjet printhead and a current-current inkjet printing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117162669A true CN117162669A (en) | 2023-12-05 |
| CN117162669B CN117162669B (en) | 2025-12-26 |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0836943A2 (en) * | 1996-10-17 | 1998-04-22 | Nec Corporation | Electrostatic ink jet printer and head |
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| CN114126877A (en) * | 2019-07-17 | 2022-03-01 | 斯克罗纳股份公司 | Ventilated printing head |
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| EP0836943A2 (en) * | 1996-10-17 | 1998-04-22 | Nec Corporation | Electrostatic ink jet printer and head |
| EP0933214A2 (en) * | 1998-01-30 | 1999-08-04 | H. Bollmann Manufacturers Ltd. | A method of and apparatus for directing ink towards substrate |
| CN102275386A (en) * | 2011-06-17 | 2011-12-14 | 华中科技大学 | Coaxial jet head for electro-hydrodynamic jet printing and application thereof |
| US20180009223A1 (en) * | 2015-01-29 | 2018-01-11 | Eth Zurich | Multi-Nozzle Print Head |
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