KR100915377B1 - Matrix type conductive liquid ejecting system using electrostatic force - Google Patents

Abstract

A matrix type conductive liquid discharge system using the electrostatic force is provided to successively print the circuit pattern by supplying the conductive ink to a nozzle. A matrix type conductive liquid discharge system using the electrostatic force comprises a nozzle layer, a common grounding electrode layer, an insulating layer, a first ink supply layer, a second ink supply layer, and a plurality of electrodes(60). The nozzle layer is tapered from the upper side to the lower side in order to supply the liquid ink to the discharge nozzle outlet of the lower part. The first ink supply layer consecutively supplies the liquid ink to the nozzle layer through vertical apertures of a first group. An ink supply channel(55) of a second group of the second ink supply layer is formed to the second direction meeting the first direction at a right angle. The second ink supply layer consecutively supplies the liquid ink to the nozzle layer through the vertical apertures of the second group and a third group.

Description

Matrix type conductive liquid ejecting system using electrostatic force

The present invention relates to a matrix type conductive liquid discharge system using electrostatic force, and more particularly, to a plurality of nozzles in a matrix form to improve wiring width on a substrate when ink jet discharge of conductive liquid or ink by electrostatic force. The present invention relates to a matrix-type conductive liquid discharge system using an electrostatic force which reduces the nozzle spacing by combining a voltage applied electrode to produce a system.

Recently, as various electronic and information communication devices have become smaller, lighter, and more direct, the development of various component parts with improved functions and the development of clean production technology without toxic substances such as RoHS regulations in Europe have been continuously raised. come. To meet these demands, technologies are being developed, one of which is inkjet printing technology.

Conventionally, an exposure / etching / plating process is generally used as a method of forming a pattern in manufacturing a printed circuit board (PCB).

However, exposure / etching / plating takes a lot of time to manufacture and the process equipment is expensive and expensive to maintain. In addition, waste liquid is generated during the etching process, which also acts as a significant burden on wastewater treatment.

In contrast, the inkjet printing method is a method of directly forming wirings without using an existing exposure / etching / plating process, and discharges a solution or suspension into droplets of several to several tens of pl (pico liter) through a fine nozzle to several tens of μm. Patterning technology to form fine lines of width.

One example of this is that a DOD (Drop on Demand) type inkjet can discharge a desired amount of ink at a desired position to obtain a clear image, and can also print directly through CAD in a non-contact manner.

Therefore, the application range of the electrode formation in the field of flat panel displays, such as PDP, the packing field of PCB, etc., and wiring formation of RFID became extensive.

However, since there is a limit in the viscosity range that can be ejected from the inkjet head, the content of the metal nanoparticles is low and the viscosity is low, and due to the spreading of the ink on the substrate, the thickness of the wiring is increased even if superimposed on the substrate. While reducing the width of the wiring, there is a limit in that fine wiring can be obtained.

As a way of solving this problem, by using the electrostatic force generated by applying a voltage between the inkjet head and the copper-clad laminate facing it, it is possible to obtain a fine pattern of reduced circuit wiring width on various substrates.

However, since one inkjet head has one kind of conductive ink, it must be used as an array to be applied to several printed circuit patterns at the same time.

However, there is a problem in that the distance between the nozzles and the connection terminal for applying a voltage or a common grounding device are not easy in the assembly of multi-type inkjet heads simply arranged in an array.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and the arrangement of an inkjet head nozzle for discharging conductive ink using an electrostatic force in a matrix form and the electrodes, the ink supply chamber and a plurality of electrodes to which power is applied It is to provide a matrix-type conductive liquid discharge system using electrostatic force that can be integrated into one system to reduce the distance between the nozzles to obtain a printed circuit pattern with a finely reduced circuit wiring width.

In addition, the present invention is a matrix type conductive liquid discharge system using an electrostatic force for facilitating continuous circuit pattern printing while continuously supplying the conductive ink printed to the nozzle by forming the ink storage layer and the nozzle portion as a tapered shape in one member It is to provide.

In addition, the present invention is to provide a matrix-type conductive liquid discharge system using the electrostatic force to obtain a printed circuit pattern with a finely reduced circuit wiring width by generating by concentrating the electrostatic force generated between the substrate and the inkjet head.

The matrix-type conductive liquid discharge system using the electrostatic force according to the present invention for achieving the above object, the conductive liquid discharge using the electrostatic force to discharge the liquid ink containing the conductive metal particles by the electrostatic force to print the printed pattern of the substrate In the system, the lower portion is provided with a plurality of discharge nozzle holes in the form of a matrix, and the upper portion is formed in a cylindrical shape for storing the conductive ink, and in the tapered shape from the upper portion to the lower portion to continuously supply the liquid ink to the lower discharge nozzle holes. And a common ground electrode layer positioned below the nozzle layer and corresponding to the discharge nozzle hole to provide a common ground to the system, and to provide electrical insulation between the nozzle layer and the common ground electrode layer. Insulation layer, said The first group of ink supply channels for supplying ink to the nozzle layer is formed in the first direction, and the first group of vertical is formed along the path of the ink supply channels of the first group to communicate with the nozzle layer. A first ink supply layer configured to continuously supply liquid ink to the nozzle layer through the through holes, and located below the first ink supply layer, wherein a second group of ink supply channels are provided to supply ink to the nozzle layer; A second group of vertical through holes formed in a second direction perpendicular to the first direction and formed along the path of the second ink supply channel to communicate with the nozzle layer; A second ink supply layer configured to continuously supply the liquid ink to the nozzle layer through the third group of vertical holes formed to communicate with the first groups of vertical holes again; And a plurality of electrodes connected through the first ink supply layer, the second ink supply layer, and the nozzle layer to extend to respective discharge nozzle holes of the nozzle layer, and having an anode connected to each other to form an electrostatic force with respect to the common ground electrode layer. It is characterized by including them.

In addition, in the matrix-type conductive liquid discharge system using the electrostatic force according to the present invention, the plurality of electrode end is characterized in that the point formed toward the discharge nozzle port.

In addition, in the matrix type conductive liquid discharge system using the electrostatic force according to the present invention, the vertical through holes of the ink supply channels are located in the flow path of the ink supply channels, and a plurality of electrodes are connected to the first ink supply layer and the second. It is characterized in that formed one around each of the through-holes penetrating the ink supply layer.

In addition, in the matrix type conductive liquid discharge system using the electrostatic force according to the present invention, the material of the nozzle layer is characterized in that it comprises PDMS.

In addition, in the matrix type conductive liquid discharge system using the electrostatic force according to the present invention, a stepped wave voltage is applied to a plurality of electrodes inserted into the electrode layer.

 In addition, in the matrix type conductive liquid discharge system using the electrostatic force according to the present invention, the liquid ink supplied to the ink supply channel is characterized in that each of the different ink flows.

In the matrix type conductive liquid discharge system using the electrostatic force according to the present invention, the first ink supply layer and the second ink supply layer are made of an insulating material.

On the other hand, the matrix-type conductive liquid discharge system using the electrostatic force according to another embodiment of the present invention, a lower nozzle layer having a plurality of discharge nozzle holes in the form of a matrix and a tapered cylinder shape for storing the conductive ink on the top A through hole is formed under the nozzle layer corresponding to the discharge nozzle hole and provides a common ground; a first group of ink supply channels formed in a first direction for supplying ink to the nozzle layer and the path thereof; A first ink supply layer having a first group of vertical through holes formed along the second ink supply channel, a second group of ink supply channels formed in a second direction for supplying ink to the nozzle layer and a second group formed along the path thereof A second ink supply having a through hole and a third group of vertical through holes formed to be in communication with the first through holes in the first group; And a plurality of electrodes extending through the first ink supply layer, the second ink supply layer, and the nozzle layer to an ejection nozzle hole of the nozzle layer, and having an anode connected to form an electrostatic force with respect to the common ground electrode layer. And a controller for controlling the ink amount of the ink supply pump and the voltage source connected to the plurality of electrodes.

In addition, in the matrix-type conductive liquid discharge system using the electrostatic force according to the present invention, the controller is characterized in that it is monitored in conjunction with a monitoring system including a video monitoring system.

According to the present invention, the arrangement of the head nozzles in a matrix form is reduced, and the circuit wiring width is minutely reduced by reducing the distance between the nozzles by integrally combining the electrodes, the ink supply chamber, and the plurality of electrodes to which the power is applied. Not only can the circuit pattern be obtained, but the printing cost and printing time can be shortened.

In addition, the present invention can obtain a printed circuit pattern having a finely reduced circuit wiring width by generating by concentrating the electrostatic force generated between the substrate and the inkjet head.

In addition, the liquid that can be applied to the present invention is not limited to the ink can be used in a variety of fluids, the matrix nozzle can be widely used in electronic circuit printing, image printing, bio applications and the like.

1A to 1E are a perspective view, a plan view, and a schematic cross-sectional view of a matrix type conductive liquid discharge system using electrostatic force according to an embodiment of the present invention.

2 is a perspective view of a common ground electrode layer located at the bottom of the matrix type conductive liquid discharge system according to the present invention.

 3 is a detailed view of an insulating layer of the matrix type conductive liquid discharge system according to the present invention.

4A to 4D are detailed views of the nozzle layer of the matrix type conductive liquid discharge system according to one embodiment of the present invention.

5A to 5D are detailed views of the first ink supply layer of the matrix type conductive liquid discharge system according to one embodiment of the present invention.

6A through 6E are detailed views of the second ink supply layer in the matrix type conductive liquid discharge system according to one embodiment of the present invention.

7 is a detailed view of an electrode in a matrix type conductive liquid discharge system according to an embodiment of the present invention.

`` Explanation of symbols for main parts of drawings ''

10: common ground electrode layer 12, 22, 42, 52: through hole

20: insulating layer 30: nozzle layer

32: nozzle port 35: chamber

40: second ink supply layer 43, 44, 53: vertical through

45, 55: ink supply channel 50: the first ink supply layer

60 electrode

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1A to 1E are a perspective view, a plan view, and a schematic sectional view of a matrix type conductive liquid discharge system using electrostatic force according to an embodiment of the present invention.

1A and 1B are a perspective view from above and a stereoscopic perspective view from below of a matrix-type conductive liquid discharge system according to the present invention.

1C is a plan view from above of the matrix conductive liquid discharge system according to the present invention.

FIG. 1D is a cross-sectional view taken along the line A-A in FIG. 1C, and FIG. 1E is a cross-sectional view taken along the line B-B in FIG. 1C.

1A to 1E, the matrix type conductive liquid discharge system using the electrostatic force according to the exemplary embodiment of the present invention has a common ground electrode layer 10, an insulating layer 20, and a plurality of discharge nozzle holes from below. Is formed by integrally combining the nozzle layer 30, the first ink supply layer 40, the second ink supply layer 50, and the plurality of electrodes 60 having a matrix form.

The liquid discharge system according to the present invention has an appearance as shown in FIG. 1A or 1B, and is a conductive liquid discharge system that discharges liquid ink including conductive metal particles by electrostatic force and prints the printed pattern on a substrate.

As shown in FIGS. 1A, 1B, and 1C, the conductive liquid discharge system has a hole in which a conductive liquid is discharged in a matrix shape at a lower portion thereof, and correspondingly, electrodes 60 are formed in a matrix shape at a top thereof. Is applied to the discharge system.

1D and 1E, in the discharge system, a plurality of discharge nozzle holes 32 arranged in a matrix form in the nozzle layer 30 are separated by the insulating layer 20 and coupled to the common ground electrode layer 10. It is.

The common ground electrode layer 10 is positioned below the nozzle layer 30 to form a through hole 12 at a position corresponding to the discharge nozzle hole 32 to provide a common ground to the discharge system.

In addition, when the first ink supply layer 50 and the second ink supply layer 40 positioned on the nozzle layer 30 supply liquid ink to the plurality of ejection nozzle holes 32 of the nozzle layer 30, Ink is ejected to the ejection nozzle port 32 while temporarily storing the liquid ink in the tapered cylinder portion of the nozzle layer 30.

In addition, the nozzle layer 30 has a plurality of tapered cylindrical spaces formed of an insulator in order to minimize interference with an electric field.

As shown in Figures 1a, 1b, 1c, the arrangement of the nozzle is a form in which the density of the nozzle is increased by adding one each time between diagonally in a total of nine multi-nozzle head of a total of 3x3.

By placing the center nozzles one by one in the form of three horizontally and vertically, it is possible to print a more dense pattern.

1A and 1B, the first ink supply layer 50 and the second ink supply layer 40 are provided with at least one ink supply channel, and supply ink to the ink supply layer 40. External ink is supplied under the control of the pump.

As shown in Figs. 1A, 1B and 1C, a first ink supply layer 50 for supplying ink onto the nozzle layer 30 is provided with four nozzles added between each in a diagonal direction in Fig. 1C. In contrast, a first group of ink supply channels are formed in the first direction.

In addition, the liquid ink is continuously supplied to the nozzle layer 30 through the first group of vertical through holes formed along the path of the ink supply channel of the first group so as to communicate with the nozzle layer.

Meanwhile, a second group of ink supply channels are formed in the second direction with respect to the nine nozzles in a second direction perpendicular to the first direction, and communicate with the nozzle layer 30 along the path of the second group of ink supply channels. The third group of vertical holes formed therein and the third group of vertical holes formed to communicate with the vertical holes of the first group of the first ink supply layer 50 are formed.

5D, 6D, and 6E to be described later, the second group of ink supply channels 45 are formed perpendicular to the first group of ink supply channels 55, and the second ink supply layer 40 is formed. The second group of vertical through holes 44 and the first group of the first ink supply layer 50 are formed to communicate with the nozzle layer 30 along the path of the ink supply channel 45 of the second group. The vertical through holes of 53 include a third group of vertical through holes 43 are formed continuously as it is.

In this case, the plurality of electrodes 60 extends through the ink supply layers 40 and 50 to each discharge nozzle hole 32 of the nozzle layer 30.

The electrodes 60 are inserted into the insertion holes of the ink supply layers 40 and 50 and extend downward, and a positive electrode power is connected to form an electrostatic force with respect to the common ground electrode layer 10.

When a step voltage is applied by the anode power, an electrostatic force is formed between the electrode 60 and the common ground electrode layer 10, and at the same time, a liquid containing conductive nanoparticles is formed in the nozzle hole 32. It is discharged downward while forming droplets.

The stepped wave voltage has an offset value for forming an electric force in the conductive liquid and droplets are formed from the conductive liquid when the peak value is reached.

In the nozzle system of the 3x3 matrix type, such as the discharge system shown in FIG. 1, the length and width of the head are about 300 µm, and the height of the system is about 410 µm including the electrode.

The length and width of the nozzle head may vary with the matrix arrangement and become larger as the number of nozzles increases.

2 is a perspective view of a common ground electrode layer located at the bottom of the matrix type conductive liquid discharge system according to the present invention.

Referring to FIG. 2, the through holes 12 formed in the common ground electrode layer 10 may be aligned with the through holes 22 of the insulating layer 20.

In the embodiment of the present invention shown in FIG. 2, the common ground electrode layer 10 has a thickness of about 30 μm, and the diameter of the through hole 12 is about 35 μm greater than the diameter of the nozzle hole 32. have.

The common ground electrode layer serves as a negative electrode or a ground force as a lowermost layer.

The potential is designed to be applied to all of the heads together at the same time as the value opposite to the electrode 60 to provide a ground connection integrated into the matrix type conductive liquid discharge system according to the present invention.

The electrostatic force is formed together with the electrode 60 needle of the uppermost layer to become the driving force of fine droplet ejection.

By incorporating ground into the nozzle holes 32 it is possible to form a relatively strong electric field even at low voltage values and eliminate the need for a ground connection on the target substrate on which the circuit pattern will be printed.

The common ground electrode layer 10 is made of a conductive material as a common ground layer for generating an electrostatic force for the plurality of electrodes 60.

 3 is a detailed view of an insulating layer of the matrix type conductive liquid discharge system according to the present invention.

The insulating layer 20 is a layer located directly above the common ground electrode layer 10, which is the lowest layer, and serves to space the ink discharge holes of the common ground electrode layer 10 and the nozzle layer 20 from each other.

The through hole 22 of the insulating layer 20 is aligned with the nozzle hole 32 of the nozzle layer to provide a passage through which the conductive liquid is ejected by the electrostatic force.

In addition, by controlling the thickness of the insulating layer 20, the influence of the electrostatic force on the conductive ink and the discharge characteristics can be adjusted.

4A to 4D are detailed views of the nozzle layer of the matrix type conductive liquid discharge system according to one embodiment of the present invention.

4A is a perspective view of a nozzle layer of a matrix type conductive liquid discharge system according to an embodiment of the present invention, FIG. 4B is a plan view, FIG. 4C is a sectional view taken along line AA of FIG. 4B, and FIG. 4D is a sectional view taken along line BB of FIG. 4B. to be.

The nozzle layer 30 has a plurality of discharge nozzle holes 32 in a matrix form at the bottom and a tapered cylinder shape at the top for storing conductive ink, and serves as an ink chamber for ink storage and at the same time as an ink discharge port. To do this.

The nozzle layer 30 is an ink chamber layer which is stored before the conductive ink is discharged outward and is made of an insulator.

Each chamber of the nozzle layer 30 is independently separated from each other, is connected to each ink ejection nozzle port 32, it can be designed to the appropriate size so that the volume can be changed according to the desired amount of ink.

The electrode 60 is inserted into the chamber 35 having a tapered cylinder shape, and the height thereof is optimized according to the strength of the electrostatic force.

Each of the chambers is tapered to narrow down from top to bottom in a cone upside down.

The discharge nozzle opening 32 formed at the lower part of the nozzle layer 30 consists of an insulator as an ink discharge opening, and has a fine diameter for discharge.

Rendering is performed on the substrate to which the conductive ink is targeted by the force of electrostatic force formed between the common ground electrode layer 10 coupled to the nozzle layer 30 and the uppermost electrode 60 between the small diameter holes. Will be attached.

At this time, the diameter of each discharge port can be optimized according to the desired printed line width.

4A and 4B, the nozzle layer 30 has 14 discharge nozzle holes 32 formed thereon, the nozzle holes 32 having a diameter of about 30 μm, and an upper portion of the nozzle layer 30. Has a diameter of about 71.5 μm and the total height of the nozzle layer is about 200 μm.

Here, the diameter of the nozzle hole 32 may vary depending on the application.

Each nozzle port 32 may simultaneously form one droplet containing conductive particles.

4C and 4 show cross-sectional views of two and three chambers 35 respectively.

The chambers 35 have a tapered cylinder shape that becomes narrower from the top to the bottom in the form of a cone upside down. The chambers have ink nozzles and nozzle nozzles 32 at the bottom to serve as ink discharge holes. .

The nozzle layer 30 is made of an insulator, and the insulator is made of polydimethylsiloxane (PDMS) or other insulating material.

5A to 5D are detailed views of the first ink supply layer of the matrix type conductive liquid discharge system according to one embodiment of the present invention.

 FIG. 5A is a perspective view from above of a first ink supply layer in a matrix type conductive liquid discharge system according to an embodiment of the present invention, and FIG. 5B is a perspective view from below. FIG. 5C is a side view of the first ink supply layer viewed from the side, and FIG. 5D is a cross-sectional view taken along line B-B in FIG. 5C.

The first ink supply layer 50 shown in Figs. 5A and 5B is formed of an insulator, and functions to fix the electrode 60 in the uppermost layer and is arranged in a diagonal four nozzle array. Has an ink supply channel 55.

A through hole 52 is drilled at each position to fix the electrode 60, and the channels 55 for ink supply penetrate from the side to the longitudinal direction in a straight line.

5A and 5B show the overall view from above and below, respectively.

5B is a view of the first ink supply layer viewed from below, and round holes are through holes 52 through which the electrode, which is the uppermost layer, penetrates.

A pair of holes are shown next to the array of four nozzles in the diagonal direction, and each ink supply channel 55 allows ink coming from the lateral ink supply channel 55 to descend into the chamber of the nozzle layer 30. It shows a vertical through hole 53 which is drilled in the middle in the downward direction.

The vertical through hole 53 serving as the ink supply hole is separated from the through hole 52 for fixing the electrode 60, and the vertical through hole 53 as the ink supply hole near the through hole 52 through which the electrode 60 penetrates. ) Is located, and referring to Figure 5b is a vertical through hole 53 is provided in pairs of two each from side to side with respect to the four through holes 52 in the center.

FIG. 5C is a side view of the first ink supply layer, showing the inlet of the ink supply channel 55 and supplying ink in the middle of the ink supply channel 55 for supplying ink below the ink supply channel 55. FIG. As shown in FIG. 5B, the vertical vertical hole 53 is drilled toward the second ink supply layer 40 and supplies ink to the nozzle layer 30 through the second ink supply layer 40.

FIG. 5D is a sectional view taken along the line B-B in FIG. 5C, and is viewed from above by cutting the position where the vertical through hole 53, which is the ink supply port, is located.

Referring to FIG. 5D, each of the four ink supply channels 55 passes in a straight line between the four through holes 52 provided in a diagonal direction.

In addition, a pair of left and right vertical through holes 53, which are ink supply holes, is formed on the four ink supply channels 55 passing through the four through holes 52 from side to side to the second ink supply layer 40. It can be seen that the communication.

6A through 6E are detailed views of the second ink supply layer in the matrix type conductive liquid discharge system according to one embodiment of the present invention.

6A is a perspective view from above of a second ink supply layer in a matrix type conductive liquid discharge system according to an embodiment of the present invention, and FIG. 6B is a perspective view from below. FIG. 6C is a side view of the second ink supply layer viewed from the side, FIG. 6D is a cross-sectional view taken along the line A-A of FIG. 6C, and FIG. 6E is a cross-sectional view taken along the line B-B of FIG. 6C.

The second ink supply layer 40 shown in FIGS. 6A and 6B is formed of an insulator, and has a function for fixing the electrode 60 in the uppermost layer and an ink supply channel for nine nozzle arrays. Have 45).

A through hole 42 is drilled at each position to fix the electrode 60, and the ink supply channels 45 for supplying ink penetrate horizontally from side to side in a straight line.

6A and 6B show the overall view of the second ink supply layer 40 as viewed from above and below, respectively.

It can be seen that the vertical through hole 53, which is the ink supply port for the four nozzle arrays in the center provided in the diagonal direction seen from the upper layer, is directly lowered and connected to the vertical through hole 43 of the second ink supply layer.

6B is a view of the second ink supply layer 40 viewed from below, and the plurality of through holes 42 penetrating through the second ink supply layer 40 are inserted into the electrode 60 as the uppermost layer.

In addition, through each of the nine nozzle arrays, through-holes, which are paired with ink supply holes, are seen, which allow ink coming from the lateral ink supply channel 45 to descend into the chamber of the nozzle layer 30, respectively. Each shows a vertical through hole 44 that is drilled downward in the middle.

Therefore, in the second ink supply layer 40, a series of ink supply channels 45 is provided in the first ink supply layer 50 to supply ink to the nozzle layer 30. Formed in a direction perpendicular to the ink supply and formed along the path of the ink supply channel 45 of the second ink supply layer 40 so as to communicate with the nozzle layer 30 in pairs of nine nozzle arrays, respectively. The vertical through holes 44 and the vertical through holes 43 formed to communicate with the vertical through holes 53 of the first ink supply layer 50 are formed together.

Therefore, in the second ink supply layer 40, the ink supplied through the first ink supply layer 50 and the ink supplied from the ink supply channel 45 of the second ink supply layer 50 are simultaneously exposed to the nozzles. It is made to continuously supply to the layer (30).

The reason for having two cross channels as shown above is to sufficiently supply ink during high speed ink ejection of the ink jetting head.

The size of the head also affects the length and cross-sectional area of the channel, which allows sufficient ink to be supplied during low-speed jetting. However, in the multi-head high-speed ink jetting, which consumes a large amount of ink, the ink supply may not be smooth due to the limited size of the ink supply channel, so the ink supply channel is designed to be separated smoothly.

Here, the vertical through holes 43 and 44 serving as the ink supply holes are separated from the through holes 42 for fixing the electrodes 60 and supply ink near the through holes 42 through which the electrodes 60 pass. Sine vertical through holes 43 and 44 are located, and referring to FIG. 6B, two vertical holes 44 are provided to each other, not only four through holes 42 in the middle, but also two out of nine holes 42. .

FIG. 6C is a side view of the second ink supply layer 40 in a side view showing the inlet of the ink supply channel 45 and in the middle of the ink supply channel 45 for supplying ink below the ink supply channel 45. FIG. A vertical through hole 44, which is an ink supply hole, is drilled toward the lower nozzle layer 30, as shown in FIG. 6B, and FIG. 5C is a side view of the first ink supply layer as viewed from the side thereof. As shown in FIG. 5B, a vertical through hole 53, which is an ink supply port, is provided in the middle of the ink supply channel 55 to supply ink below the ink supply channel 55. The ink is supplied to the nozzle layer 30 together with the vertical through hole 43 which is drilled toward and descends from the first ink supply layer 50 as it is.

FIG. 6D is a cross-sectional view taken along the line A-A of FIG. 6C, and is viewed from above by cutting the ink supply channel 45 in which the vertical through hole 44, which is the ink supply port, is located.

Referring to FIG. 6D, each of the ink supply channels 45 passes in a straight line as six channels between nine through holes 42. As shown in FIG.

In addition, it can be seen that the vertical through holes 44, which are ink supply holes, are formed in the nozzle layer 30 by pairing up and down the through holes 42 on the six ink supply channels 45 passing through the through holes 42.

In addition, the four through holes 42 in the diagonal direction of the center portion descending from the first ink supply layer 50 descend from the vertical through holes 53 of the first ink supply layer 50, respectively, around the through holes 42. Vertical through holes 43, which are paired left and right, are also formed in the second ink supply layer 40 to draw ink from the ink supply channel 55 of the first ink supply layer 50 to the nozzle layer 30. It can be seen that the supply.

FIG. 6E is a cross-sectional view taken along the line B-B of FIG. 6C, and is viewed from above by cutting the upper portion of the ink supply channel 45 where the vertical through hole 44, which is the ink supply hole, is located.

In FIG. 6E, as shown in FIG. 6A, the vertical through hole 53, which is an ink supply port for the four nozzle arrays in the center, provided in the diagonal direction seen from the first ink supply layer 50, which is directly above, is lowered and the second ink is left as it is. It can be seen that it is formed between the ink supply channel 45 to be connected to the vertical through 43 of the supply layer 40.

6D and 6E, the vertical through holes 43 and 44, which are supply holes, are separated from the through holes 42, which are holes for fixing the electrode 60, and the upper and lower vertical through holes 44 and 4 for the nine nozzle arrays. The left and right vertical through holes 43 for the four nozzle arrays are also separated by ink supply channels 45 and 55 that are perpendicular to each other.

7 is a detailed view of an electrode in a matrix type conductive liquid discharge system according to an embodiment of the present invention.

As shown in FIG. 7, the ends of the plurality of electrodes 60 are in the form of nails with sharp ends.

This is to sharpen the end portion of the electrode 60 toward the discharge nozzle opening 32 so that the electric field due to the applied voltage becomes stronger with respect to the conductive liquid.

The material mainly used as the electrode 60 is tungsten needle, the width of which is the thinnest part is 1 mu m.

Functionally, the electrostatic force generated by forming an electric field in the nozzle portion 32, which is the droplet ejection portion of the head, by applying a voltage to the electrode 60 is applied to the conductive ink to eject the smallest possible size.

The electrodes 60 are inserted into the through holes 52 of the first ink supply layer 50 and the through holes 42 of the second ink supply layer 40 to form nozzle holes below the cylindrical space of the nozzle layer 30. It extends up to 32, and a positive power source is connected to form an electrostatic force with respect to the common ground electrode layer 10.

The positive power source connected to the electrodes 60 is connected through a control device, and a step voltage is applied by the positive power source.

When the stepped wave voltage is applied, an electrostatic force is formed between the electrode 60 and the common ground electrode layer 10, and at the same time, in the nozzle hole 32, liquid containing conductive nanoparticles discharges downward while forming droplets. do.

The stepped wave voltage has an offset value for forming an electric force in the conductive liquid and droplets are formed from the conductive liquid when the peak value is reached.

The electrostatic force generated by the electric field generates Maxwell stress in the conductive liquid having an interface with air, and when the force exceeds the internal attractive force and surface tension of the conductive liquid, the conductive liquid is deformed.

This phenomenon can be obtained through the offset value from the stepped wave voltage applied electric field.

When the stepped wave voltage peak value is applied to the electrode, the conductive liquid is deformed to form droplets.

Here, the volume of the droplet depends on the peak value of the stepped wave voltage applied, and the larger the voltage peak value, the finer the droplet size.

Droplet formation also depends on the frequency of the voltage peaks applied to the conductive liquid through the electrodes.

The electrodes 60 may be manufactured by anodizing or etching.

The conductive liquid discharge system using the matrix type electrostatic force according to the present invention can be easily produced by the MEMS method, all the layers can be formed through the etching process.

Meanwhile, the conductive liquid discharge system using the matrix type electrostatic force according to the present invention may include a voltage source connected to the plurality of electrodes 60 and a controller for controlling the ink amount of the ink supply pump.

The controller can be operated by controller software that controls each nozzle to implement a discharge mechanism.

In particular, the droplet formation parameter in the discharge mechanism may be adjusted according to the performance of the controller, where the controller may be monitored in conjunction with a monitoring system including a video monitoring system.

Although the present invention has been described in detail only with respect to the specific embodiments described, it will be apparent to those skilled in the art that various changes and modifications are possible within the technical scope of the present invention, and such modifications and modifications belong to the appended claims. .

Claims (9)

In the conductive liquid discharge system using the electrostatic force for discharging the liquid ink containing the conductive metal particles by the electrostatic force to print a printed pattern of the substrate, A nozzle layer having a plurality of discharge nozzle holes in a matrix shape at a lower part thereof, and having a cylindrical shape at a top thereof storing a conductive ink, and having a taper shape while going from top to bottom to continuously supply liquid ink to the lower discharge nozzle holes; A common ground electrode layer positioned below the nozzle layer to form a through hole at a position corresponding to the discharge nozzle hole and provide a common ground to the system; An insulating layer providing electrical insulation between the nozzle layer and the common ground electrode layer;  A first group of ink supply channels for supplying ink to the nozzle layer is formed in a first direction, and is formed along a path of the ink supply channels of the first group to communicate with the nozzle layer. A first ink supply layer configured to continuously supply liquid ink to the nozzle layer through the vertical through holes; Located below the first ink supply layer, a second group of ink supply channels are formed in a second direction perpendicular to the first direction to supply ink to the nozzle layer, and the ink supply of the second group A second group of vertical through holes formed along the path of the channel to communicate with the nozzle layer, and through a third group of vertical through holes formed to communicate with the vertical through holes of the first group of the first ink supply layer. A second ink supply layer configured to continuously supply liquid ink to the nozzle layer; And A plurality of electrodes extending through the first ink supply layer, the second ink supply layer, and the nozzle layer to each of the discharge nozzle holes of the nozzle layer, and having an anode connected to each other to form an electrostatic force with respect to the common ground electrode layer; Matrix-type conductive liquid discharge system using an electrostatic force, characterized in that it comprises a. The method of claim 1, And a plurality of electrode end portions are sharply formed toward the discharge nozzle port. The method of claim 1, The vertical through holes of the ink supply channels are located in the flow path of the ink supply channels, and a plurality of electrodes are formed around each of the through holes penetrating the first ink supply layer and the second ink supply layer. Matrix conductive liquid discharge system using electrostatic force. The method of claim 1, The material of the nozzle layer is a matrix type conductive liquid discharge system using an electrostatic force, characterized in that the PDMS. The method of claim 1, And a stepped wave voltage is applied to the plurality of electrodes inserted into the electrode layer. The method of claim 1, And the liquid ink supplied to the ink supply channel flows different inks, respectively. The method of claim 1, And the first ink supply layer and the second ink supply layer are made of an insulating material. A nozzle layer having a plurality of discharge nozzle holes in a matrix shape at a lower part thereof and having a tapered cylinder shape at the top for storing conductive ink; A common ground electrode layer formed through the nozzle layer corresponding to the discharge nozzle hole and providing a common ground;  A first ink supply layer having a first group of ink supply channels formed in a first direction for supplying ink to the nozzle layer and a first group of vertical through holes formed along the path thereof; A second group of ink supply channels formed in a second direction for supplying ink to the nozzle layer and a second through hole of the second group formed along the path, and a third to communicate with the first through holes of the first group again A second ink supply layer having a group of vertical through holes; And A plurality of electrodes having an anode connected to the first ink supply layer, the second ink supply layer, and the nozzle layer to extend to a discharge nozzle hole of the nozzle layer and to form an electrostatic force with respect to the common ground electrode layer; And And a controller for controlling the ink amount of the ink supply pump and the voltage source connected to the plurality of electrodes. The method of claim 8, And the controller is monitored in association with a monitoring system including a video monitoring system.