KR100937007B1 - Apparatus for jetting droplet and method therefor - Google Patents

Abstract

PURPOSE: A droplet spray device and a method thereof are provided to control the spraying of a droplet through a nozzle by overlapping and applying the pulse signal to an electrode module. CONSTITUTION: A droplet spray device comprises a nozzle body(100), electrode modules(210,220), a signal generating section(300), and a controller(400). The nozzle body comprises a nozzle(104) for spraying the droplet on the one side of the prints. The electrode modules are attached to the outside of the nozzle body or are installed to be spaced from the outside. The signal generating section applies the alternating current signal to the electrode module. The controller controls the size and frequency of the output signal of the signal generating section.

Description

Drop ejection apparatus and method {APPARATUS FOR JETTING DROPLET AND METHOD THEREFOR}

The present invention relates to a droplet ejection apparatus and method, and more particularly, by applying an electrostatic field to the oil surface of a fluid injected through a nozzle to finely and efficiently spray, print, and pattern the fluid in the form of droplets. The present invention relates to a droplet ejection apparatus and a method for enabling the same.

In general, droplet ejection, which ejects fluid in the form of droplets, has been applied to a variety of inkjet printers, and has recently been applied to high value-added fields such as display processing equipment, printed circuit board processing equipment, and DNA chip manufacturing processes. Application is being developed to apply.

In the above ink jet printer, the ink ejection value for ejecting ink in the form of droplets is largely divided into a thermal drive method and an electrostatic force method.

First, as shown in FIGS. 1 and 2, the ink ejection device of the thermal drive method is formed by the manifold 22 provided in the substrate 10 and the partition wall 14 formed on the substrate 10. The ink channel 24 and the ink chamber 26, which are constrained constrained, the heater 12 provided in the ink chamber 26, and the nozzle plate 18 are sprayed on the ink droplet 29 '. Includes a nozzle 16, and the ink ejection device of the thermal drive method ejects the droplet 29 'by the following operation.

When a voltage is supplied to the heater 12, heat is generated, and the ink 29 filled in the ink chamber 26 is heated by this heat to generate bubbles 28.

Next, the generated bubble 28 continues to expand, so that pressure is applied to the ink 29 filled in the ink chamber 26, and the ink droplet 29 ′ is discharged through the nozzle 16. 16) It is sprayed to the outside.

Thereafter, the ink chamber 26 is refilled with the ink 29 while the ink 29 is sucked into the ink chamber 26 from the manifold 22 through the ink channel 22.

However, the above-described conventional thermally driven ink jetting device may cause a chemical change of the ink 29 due to the heat of the heater 12 for forming a bubble, so that the quality of the ink 29 There is a disadvantage that problems such as degradation can occur.

In addition, the droplet 29 'of the ink ejected through the nozzle 16 may cause a rapid volume change due to the heat of the heater 12 while moving toward an object such as paper. There is also a problem that the print quality is degraded.

In addition, there is a problem in that the thermal injection type ink jetting device has a limitation in fine control of the droplet 29 'injected through the nozzle 16, for example, the size and shape of the droplet.

In addition, due to the above problems, there is also a problem that it is difficult to implement a high-density droplet ejection apparatus.

3 and 4 illustrate another method of the droplet ejection apparatus, that is, an electrostatic force droplet ejection device using an electric field.

In more detail, as shown in FIGS. 3 and 4, the electrostatic force type droplet spraying device is provided with an opposite electrode 33 positioned to face the base electrode 32. Ink 31 is injected between the two electrodes 32 and 33, and a DC power supply 34 is connected to the two electrodes 32 and 33.

When a voltage is applied to the electrodes 32 and 33 by the DC power supply 34, an electrostatic field is formed between the two electrodes 32 and 33.

Accordingly, Coulomb's Force acting in the direction of the counter electrode 33 acts on the ink 31.

On the other hand, since the repulsive force with respect to the coulomb force also acts on the ink 31 due to its inherent surface tension and viscosity, the ink 31 is not easily ejected toward the counter electrode 33.

Therefore, in order to separate the droplet from the surface of the ink 31 and to eject it, a high voltage of 1 kV or more must be applied between the electrodes 32 and 33.

However, when a high voltage is applied between the electrodes 32 and 33, the ejection of the droplets occurs very irregularly, thereby locally heating a predetermined portion of the ink 31.

That is, the temperature T1 of the ink 31 'located in the region of S1 rises higher than the temperature T0 of the ink 31 located in the other region, so that the ink 31' of the region S1 is raised. Expands, and the electrostatic field is concentrated in this region, whereby a large number of charges are collected.

Accordingly, the repulsive force acting between the charges and the coulomb force due to the electrostatic field act on the ink 31 'of the S1 region, and as shown in FIG. 4, from the ink 31' of the S1 region. As the droplets are separated, they move toward the counter electrode 33.

5 shows an ink ejection method of the electrostatic force method. There is a nozzle 4 provided with an electrode 6 and an opposing electrode 7 is present in the lower part of the substrate 8 so as to eject the droplets and spray the substrate 8 on the principle described above. The method of applying a voltage is to apply a DC power supply in the form of a pulse between the electrode 6 and the counter electrode 7 present in the nozzle 4.

Research results and related prior patents showing successful jetting and patterning in this manner have been reported continuously.

However, the above-mentioned electrostatic force type droplet ejection has the following problems or disadvantages to be overcome. A very high voltage of 1 kV or higher must be applied to the electrode 6, and an electrode 6 must be provided inside the nozzle 4 and an external counter electrode 7 beneath the substrate 8. . Providing the electrode 6 inside the nozzle 4 requires a very complicated process. In addition, there may be instability in which a single droplet is atomized into small droplets and sprayed in the process of discharging the droplets toward the counter electrode 7, and the nozzle 4 approaches the substrate 8 to improve the straightness of the droplets. If there is a limit, there is an electrical breakdown due to electrical breakdown. Since the discharged droplets are basically charged, there is a force acting between the liquid level present on the nozzle 4 and the substrate 8, and thus, the traveling direction is distorted near the substrate 8. exist. Finally, an electro-chemical reaction may be caused by the current flowing inside the ink.

An object of the present invention for solving the problems according to the prior art, by applying an alternating signal only to the electrode module provided on the outside of the nozzle body, it is possible to spray the droplets through the nozzle of the nozzle body, the AC module The present invention provides a droplet ejection apparatus and method capable of controlling injection of droplets through a nozzle of a nozzle body by superimposing a pulse signal to the electrode module while applying a bias as a sex signal.

In the droplet ejection apparatus of the present invention for solving the above technical problem, a droplet ejection apparatus for injecting droplets on one surface of a printed matter, a chamber for accommodating a predetermined amount of fluid supplied from the outside, the chamber is in communication with the chamber A nozzle body including a nozzle for injecting droplets of the received fluid onto one surface of the printed matter; An electrode module attached to or spaced from an outer surface of the nozzle body; A signal generator for applying an alternating signal to the electrode module; And a control unit for setting and controlling the magnitude of the output signal of the signal generator as a bias.

Preferably, the electrode module is characterized in that it is installed in a structure of surrounding the nozzle of the nozzle body.

Preferably, the electrode module includes a first electrode unit which is attached or spaced apart from the outer surface of the nozzle body; And a second electrode part attached to or spaced apart from the outer surface of the nozzle body so as to be spaced apart from the first electrode part.

Preferably, the first electrode portion and the second electrode portion is characterized in that the installation is symmetrical with respect to the nozzle of the nozzle body.

Preferably, the first electrode portion is spaced apart from one side of the nozzle body of the nozzle body, the second electrode portion is characterized in that the spaced apart from the other side of the nozzle body.

Preferably, the first electrode portion is provided in pairs spaced apart from each other on both sides of the outer surface of the nozzle body, the second electrode portion is characterized in that attached to the other surface of the print or spaced apart.

Preferably, the first electrode unit is integrally spaced apart from both sides of the nozzle body and the nozzle, respectively, and is integrally installed, and a through hole is formed through which droplets are injected from the nozzle to one surface of the printed matter. The second electrode portion is characterized in that installed on the other surface of the print or spaced apart.

Preferably, the nozzle body is characterized in that the nozzle side is formed in a flat plate shape of the cross section is reduced or the cylindrical shape of the cross section of the nozzle side is reduced.

Preferably, the first electrode part and the second electrode part are laminated with each other via an insulating spacer, and the laminated first electrode part and the second electrode part are attached to the outer circumference of the nozzle. It is done.

Preferably, the first electrode part and the second electrode part are laminated with each other via an insulating spacer, and the mutually laminated first electrode part and the second electrode part are disposed to be spaced apart from the outer circumference of the nozzle. Characterized in that the through-holes through which the droplets are injected from the nozzle to one surface of the printed material is formed.

Preferably, the first electrode is spaced apart from one side of the nozzle body, and the second electrode is formed with a through hole through which droplets are injected from the nozzle to one surface of the printed material so that one surface of the printed material is formed. Spaced apart from or installed on the other surface of the print is characterized in that spaced apart.

Preferably, the pulse signal unit for supplying a pulse signal at the peak point of the AC signal supplied to the first electrode portion and the second electrode portion; characterized in that it further comprises.

Preferably, a plurality of nozzle bodies including the first and second electrode parts are provided adjacent to each other through an insulating spacer, and the AC signal is applied to each of the first and second electrode parts of the plurality of nozzle bodies installed next to each other. It is characterized by.

Preferably, the apparatus further includes a plurality of pulse signal parts for supplying a pulse signal at peak points of the alternating signals supplied to the first electrode part and the second electrode part of each nozzle body.

Preferably, the nozzle of the nozzle body is characterized in that composed of a conductive material.

Preferably, the nozzle of the nozzle body is characterized in that the conductive wire is composed of a non-conductive material interpolated.

According to another aspect of the present invention, there is provided a droplet ejection method, comprising: a) a chamber for accommodating a predetermined amount of fluid supplied from the outside, and communicated with the chamber; Providing a nozzle body comprising a nozzle for injecting droplets of fluid contained in the chamber onto one surface of the printed matter; b) installing an electrode module to be attached or spaced apart from one side of the outer surface of the nozzle body; And c) applying an alternating signal to the electrode module.

According to another aspect of the present invention, there is provided a droplet ejection method comprising: a) a chamber for accommodating a predetermined amount of fluid supplied from the outside, the chamber being in communication with the chamber; Providing a nozzle body comprising a nozzle for injecting droplets of fluid contained in the chamber onto one surface of the printed matter; b) installing an electrode module to be attached or spaced apart from one side of the outer surface of the nozzle body; c) applying a bias to the electrode module as an alternating signal; And d) applying a pulse signal to the electrode module at the peak point of the ac signal.

According to the present invention as described above, by applying an alternating signal only to the electrode module provided on the outside of the nozzle body, it is possible to eject the droplet through the nozzle of the nozzle body.

In addition, in the state where a bias is applied to the electrode module as an alternating signal, a pulse signal may be additionally applied to the electrode module to control injection of droplets through the nozzle of the nozzle body.

In addition, in arranging a plurality of droplet ejection devices having a configuration according to an embodiment of the present invention at predetermined intervals, there is an advantage that a highly integrated arrangement is possible without being affected by various thermal problems as in the prior art. .

A feature of the present invention is to apply an alternating signal only to the electrode module without applying a signal to the nozzle, thereby overcoming the problems of the conventional electrostatic force type droplet ejection apparatus. Conventional droplet injection device has to be provided with an electrode inside the nozzle, the process is very complicated, but the process can be omitted in the present invention.

In addition, in the process of droplet ejection toward the counter electrode, a single droplet is atomized into small droplets to stabilize the frequent instability of the ejection, and it is possible to stabilize the nozzle even when the nozzle needs to approach the substrate to improve the straightness of the droplet. There is no electrical short.

In addition, since the alternating signal is used, it is possible to overcome the problem that the traveling direction is distorted near the substrate by minimizing the force acting between the discharged droplet, the liquid surface and the substrate.

Finally, it is possible to minimize the electro-chemical reaction that may be caused by the current flowing inside the ink.

The invention will become more apparent through the preferred embodiments described below with reference to the accompanying drawings. Hereinafter will be described in detail to enable those skilled in the art to easily understand and reproduce through embodiments of the present invention.

As shown in FIG. 6, the droplet ejection device according to the present exemplary embodiment includes an electrode module and a signal generator, which are composed of a nozzle body 100, a first electrode part 210, and a second electrode part 220. 300, the pulse signal unit 500 and the control unit 400 are configured.

It will be described with respect to the nozzle body (100).

As shown in FIGS. 6 to 13, the nozzle body 100 includes a chamber 102 and a nozzle 104, and the chamber 102 may be sprayed through the nozzle 104. That is, as a part that provides a space in which the fluid can be accommodated, a certain amount of fluid supplied from the outside is received.

Meanwhile, the nozzle 104 is formed at one end of the chamber 102, and is formed at one end of the chamber 102 so as to communicate with the chamber 102, and the fluid contained in the chamber 102 is the nozzle 104. As it is discharged through), the fluid is formed into droplets and then sprayed onto one surface of the printed material A to be seated.

The nozzle 104 of the nozzle body 100 may be made of a conductive material or a non-conductive material in which a conductive wire is interpolated. As such, the nozzle 104 may be entirely made of a conductive material or part of the conductive wire. If is configured to interpolate, there is an advantage that the efficiency of jetting is increased. This is because currents induced by an external electric field in the conductive material can be generated and as a result can act on the ink more strongly in the electric field.

As described above, the nozzle body 100 including the chamber 102 and the nozzle 104 may be formed in various shapes. As shown in FIG. 6, the nozzle 104 has a flat plate having a smaller cross section. It may be formed in a shape to be formed in a structure that is advantageous for integration, and as shown in Figure 7, it may be formed in a cylindrical shape that the cross section of the nozzle 104 side becomes smaller, it can be formed in various ways in addition to this shape.

By the nozzle body 100 configured as described above, a certain amount of fluid may be supplied to the chamber 102 and received therein, and then injected into the printout A through the nozzle 104.

An electrode module including the first electrode part 210 and the second electrode part 220 will be described.

The electrode module is installed in a structure that surrounds the nozzle 104 of the nozzle body 100. For example, as shown in Figure 6, the electrode module is attached to the outer surface of the nozzle body 100 or It comprises a first electrode 210 is spaced apart and the second electrode 210 is attached to or spaced apart from the outer surface of the nozzle body 100 so as to be spaced apart from the first electrode (210). Can be.

In this case, the first electrode 210 and the second electrode 220 are installed to be symmetrical with respect to the nozzle body 100.

The first electrode 210 and the second electrode 220 receive an alternating signal from the signal generator 300 and receive a pulse signal from the pulse signal unit 500 to form an electrostatic field. As a part for the specific first configuration, as shown in FIGS. 6 and 7, the first electrode part 210 is installed or attached to one side of the outer surface of the nozzle body 100, The second electrode unit 220 may be attached or spaced apart from the other side of the outer surface of the nozzle body 100.

In a second specific configuration of the first electrode 210 and the second electrode 220, as shown in FIG. 8, the first electrode 210 is a nozzle 104 of the nozzle body 100. The second electrode unit 220 may be spaced apart from one side of the nozzle body 100 and spaced apart from the other side of the nozzle 104 of the nozzle body 100.

In a third specific configuration of the first electrode part 210 and the second electrode part 220, as shown in FIG. 9, the first electrode part 210 has both sides of the outer surface of the nozzle body 100. In spaced apart from each other are installed in a pair, the second electrode 220 may be attached or spaced on the other surface of the printed material (A).

In the fourth configuration of the first electrode unit 210 and the second electrode unit 220, as shown in FIG. 10, the first electrode unit 210 has both sides of the outer surface of the nozzle body 100. And a through hole (th) through which droplets injected from the nozzle 104 to one surface of the printed matter (A) pass through the nozzle 104, and are integrally installed. 220 may be attached or spaced apart from the other surface of the printed matter (A).

As shown in FIG. 11, the fifth structure of the first electrode part 210 and the second electrode part 220 may be formed between the first electrode part 210 and the second electrode part 220. The first electrode part 210 and the second electrode part 220 may be attached to the outer circumference of the nozzle 104 by being laminated to each other through the insulating spacer IS.

A sixth specific configuration of the first electrode portion 210 and the second electrode portion 220 is, as shown in FIG. 12, between the first electrode portion 210 and the second electrode portion 220. The first electrode part 210 and the second electrode part 220 are stacked on the outer circumference of the nozzle 104 so as to be laminated with each other through an insulating spacer IS. At 104, a through hole th penetrating a droplet sprayed onto one surface of the printed matter A may be formed.

In a seventh specific configuration of the first electrode unit 210 and the second electrode unit 220, as shown in FIG. 13, the first electrode unit 210 is disposed on one side of the nozzle body 100. The second electrode portion 220 is spaced apart from each other, and a through hole (th) through which droplets injected from the nozzle 104 to one surface of the printed matter (A) penetrates is formed so that one side of the printed matter (A) is formed. It may be installed spaced apart from the surface or may be installed spaced apart from the other surface of the printed matter (A).

The first electrode unit 210 and the second electrode unit 220 configured as described above are attached to or separated from the outer surface of the nozzle body 100 to be disposed with each other to generate an AC signal from the signal generator 300. It receives the pulse signal from the pulse signal, thereby forming an electrostatic field to induce charge in the droplets contained in the chamber 102 of the nozzle body (100).

The signal generator 300, the pulse signal unit 500, and the controller 400 will be described.

The signal generator 300 is a component for applying an alternating signal to the first electrode 210 and the second electrode 220 described above, and the first electrode 210 and the second electrode 220 ( When an alternating signal is applied to the 220, electric charge is induced to the liquid level of the fluid contained in the chamber 102 of the nozzle body 100.

At this time, an electrostatic force is formed on the liquid surface by electric charges induced on the liquid surface, and when the electrostatic force overcomes the surface tension of the liquid surface, ejection of the droplet is performed.

That is, in the application of the AC signal, if the magnitude of the AC signal is controlled to be lower than the surface tension of the liquid surface, the ejection of the droplet does not occur, and the magnitude of the AC signal is higher than the surface tension of the liquid surface. Control of the liquid will cause the ejection of the droplets.

As described above, when a general DC signal is used instead of the AC signal, there is a problem that discharge of continuous droplets does not occur.

The charge induced on the liquid surface by the direct current signal concentrates only the same (positive or negative) charge, and discharges a considerable amount of charge by discharging the initial droplets, thereby preventing further droplet ejection. For example, in the pulse signal, the same (positive or negative) charge is concentrated because the amount of voltage change is extremely high at the positive edge or the negative edge of the pulse signal. Of course, the charge concentration time is extremely short and even its efficiency is low. In addition, in the signal other than the etch portion, the voltage change amount is '0', so that no charge is induced to the liquid level. Therefore, the droplet discharge by the DC signal does not occur.

In the present invention, as described above, the droplets may be discharged by controlling the magnitude of the AC signal. In addition, in order to control a plurality of nozzles individually, a switching system for controlling a signal is required. In this case, since switching of a high voltage is not suitable, the first electrode part 210 and the second electrode part 220 are not directly controlled. The liquid crystal is discharged by additionally applying a pulse signal from the pulse signal unit 500 to the first electrode portion 210 and the second electrode portion 220 while the AC signal is applied as a bias. You can do that. Here, the pulse signal unit 500 provides a pulse wave embodied wave signal, and the pulse supply timing is determined by the controller 400.

Here, the pulse supply timing is to apply a pulse signal of a predetermined size at the peak point of the alternating signal provided from the signal generator 300. That is, a pulse signal for droplet injection is applied while a bias is applied by the alternating signal. The AC signal is supplied to the first electrode portion 210 and the second electrode portion 220 to induce a bias state to each electrode to fill the amount of charge in the droplets. In this case, the droplets are not discharged in a state where the charge amount is filled, and for this purpose, the magnitude of the AC signal is determined. The magnitude of the alternating signal depends on the volume of the droplet and the volume of the chamber 102 and can be determined on an experimental basis.

As described above, after the bias is applied to the first electrode portion 210 and the second electrode portion 220, a pulse signal is applied at the peak point of the closest AC signal among the time points at which droplet injection is required. When the pulse signal is supplied while the droplet charge is filled by the bias, the voltage change amount (dV / dt) is the highest at the positive edge or negative edge portion of the pulse signal, and this voltage change induces an electric field. This electric field induces the polarity of the droplets to be the same polarity, and repulsive forces between droplet molecules occur. Therefore, the droplets are ejected at the timing of supplying the pulse signal (positive or negative edge point).

That is, in the state in which the signal generator 300 biases the first and second electrode parts 210 and 220 with an alternating signal in which droplets are not discharged, as in V1 of FIG. 18, the pulse signal part. In operation 500, a pulse signal such as V2 of FIG. 18 is applied to the first and second electrode parts 210 and 220, and the first and second electrode parts 210 and 220 are connected to the AC signal as shown in V3 of FIG. 18. A signal obtained by synthesizing a pulse signal is applied, and as a result, ejection of the droplet occurs only when a pulse signal is applied.

Here, in the state in which the signal generating unit 300 applies an alternating signal in which the droplet is not discharged to the first and second electrode portions 210 and 220 as shown in V1 of FIG. 19, the pulse signal unit In operation 500, a pulse signal such as V2 of FIG. 19 may be applied to the first and second electrode parts 210 and 220 to use a synthesized signal as shown in V3 of FIG. 19.

The controller 400 controls the magnitude of the AC signal applied from the signal generator 300 to the first and second electrode portions 210 and 220, and at the same time, the first and second signals from the pulse signal unit 500. The pulse signal applied to the two electrode portions 210 and 220 is controlled to control droplet ejection having a specific time interval.

The fluid received in the chamber 102 of the nozzle body 100 by the signal generator 300, the pulse signal unit 500, and the controller 400 configured as described above is connected to the nozzle 104 of the nozzle body 100. In the discharge through, it is possible to discharge the droplets having a specific time interval desired by the user.

On the other hand, it will be described with respect to the structure in which a plurality of nozzle body 100 having the configuration as described above is installed.

In a structure in which a plurality of nozzle bodies 100 are installed in an integrated manner, as illustrated in FIG. 14, the insulating spacers IS may be installed to be adjacent to each other through the nozzle bodies 100.

Referring to FIG. 14, the first nozzle body 100a, the second nozzle body 100b, the third nozzle body 100c, and the fourth nozzle body 100d are arranged adjacent to each other, and the first nozzle body 100a, the second nozzle body 100b, and the fourth nozzle body 100d are arranged next to each other. First and second electrode parts 210a and 220a are provided at both sides of the first nozzle body 100a, and first and second electrode parts 210b and 220b are provided at both sides of the second nozzle body 100b. First and second electrode parts 210c and 220c are provided at both sides of the third nozzle body 100c, and first and second electrode parts 210d and 220d are provided at both sides of the fourth nozzle body 100d. do.

Meanwhile, between the second electrode portion 220a and the first electrode portion 210b, between the second electrode portion 220b and the first electrode portion 210c, and between the second electrode portion 220c and the first electrode portion. An insulating spacer IS is interposed between the portions 210d.

The first electrode part 210a, 210b, 210c, 210d and the second electrode part 220a, 220b, 220c, 220d are connected to the signal generator 300 to receive an alternating current signal. The alternating signal is an alternating signal in which droplets are not discharged as in V1 of FIG. 18, and is used as a bias.

In addition, the first pulse signal part 500a is connected between the first electrode part 210a and the second electrode part 220a, and between the first electrode part 210b and the second electrode part 220b. The second pulse signal part 500b is connected, and the third pulse signal part 500c is connected between the first electrode part 210c and the second electrode part 220c, and the first electrode part 210d is connected to the second pulse signal part 500b. The fourth pulse signal part 500d is connected between the second electrode part 220d.

Accordingly, as shown in FIG. 15, when a pulse signal is applied to the first electrode portion 210a and the second electrode portion 220a through the first pulse signal portion 500a, the first nozzle body 100a is removed from the first nozzle body 100a. The droplets are ejected and ejected, and as shown in FIG. 16, a pulse signal is applied to the first electrode portion 210b and the second electrode portion 220b through the second pulse signal portion 500b and at the same time, a third pulse is generated. When a pulse signal is applied to the first electrode portion 210c and the second electrode portion 220c through the signal portion 500c, droplets are ejected from the second nozzle body 100b and the third nozzle body 100c and sprayed. As shown in FIG. 17, when a pulse signal is applied to the first electrode portion 210d and the second electrode portion 220d through the fourth pulse signal portion 500d, the fourth nozzle body 100d is removed from the fourth nozzle body 100d. Droplets are ejected and ejected. That is, it is possible to control the droplets discharged from each nozzle body (100a, 100b, 100c, 100d).

On the other hand, a droplet injection method for injecting droplets will be described.

Droplet injection method according to this embodiment,

a) a chamber 102 for accommodating a predetermined amount of fluid supplied from the outside, a nozzle for injecting droplets of fluid communicated from the chamber 102 and contained in the chamber 102 to one surface of the printed matter A; Providing a nozzle body 100 comprising 104;

b) installing an electrode module to be attached or spaced apart from one side of the outer surface of the nozzle body 100; And

c) applying an alternating signal to the electrode module;

It is made, including.

That is, the electrode module (a pair) is attached to or spaced apart from the outer surface of the nozzle body 100 is provided with a chamber 102 for receiving the fluid to eject the droplet and a nozzle 104 for ejecting the fluid to form a droplet The first and second electrode portions 210 and 220 of the nozzle to induce charge to the liquid level of the fluid contained in the chamber 102 of the nozzle body 100 by applying an alternating current signal to the liquid level of the fluid. The induced charge causes the electrostatic force to be formed on the liquid surface. When the electrostatic force overcomes the surface tension of the liquid surface, the droplet is discharged.

In this case, in the application of the AC signal, if the magnitude of the AC signal is controlled to be lower than the surface tension of the liquid surface, the ejection of the droplet does not occur, and the magnitude of the AC signal is higher than the surface tension of the liquid surface. Control of the liquid will cause ejection of the droplets.

Another droplet injection method according to the present embodiment,

a) a chamber 102 for accommodating a predetermined amount of fluid supplied from the outside, a nozzle for injecting droplets of fluid communicated from the chamber 102 and contained in the chamber 102 to one surface of the printed matter A; Providing a nozzle body 100 comprising 104;

b) installing an electrode module to be attached or spaced apart from one side of the outer surface of the nozzle body 100;

c) applying a bias to the electrode module as an alternating signal; And

d) applying a pulse signal to the electrode module;

It is made, including.

That is, the electrode module (a pair) is attached to or spaced apart from the outer surface of the nozzle body 100 is provided with a chamber 102 for receiving the fluid to eject the droplet and a nozzle 104 for ejecting the fluid to form a droplet A pulse signal is applied to the electrode module (a pair of first and second electrode portions 210 and 220) while a bias is applied as an alternating signal by installing the first and second electrode portions 210 and 220 of the first and second electrode portions 210 and 220. To spray the droplets.

Specifically, a pulse signal is applied to the electrode module (a pair of first and second electrode parts 210 in a state in which a bias is applied as an alternating signal to an electrode module (a pair of first and second electrode parts 210 and 220). 220) to additionally apply droplets, and the AC module (a pair of first and second electrode portions 210, which transmits an alternating signal that is not discharged as shown in V1 of FIG. 18). 220), when a pulse signal such as V2 of FIG. 18 is applied to the electrode module (a pair of first and second electrode portions 210 and 220), the electrode module (a pair of first) The combined signal of the acetic signal and the pulse signal is applied to the two electrode parts 210 and 220 as shown in V3 of FIG.

Although the present invention has been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that many different and obvious modifications are possible without departing from the scope of the invention from this description. Therefore, the scope of the invention should be construed by the claims described to include many such variations.

1 and 2 is an exemplary view showing a droplet injection of the conventional thermal drive method.

3 and 4 is an exemplary view showing a drop ejection value of the conventional electrostatic force method.

5 is a view for explaining a conventional electrostatic force ink injection method.

6 is a schematic perspective view schematically showing a droplet injection device according to the first embodiment of the present invention.

7 is a schematic perspective view schematically showing a droplet ejection device according to a second embodiment of the present invention.

8 is a schematic perspective view schematically showing a droplet injection device according to a third embodiment of the present invention.

9 is a schematic perspective view schematically showing a droplet injection device according to a fourth embodiment of the present invention.

10 is a schematic perspective view schematically showing a droplet ejection device according to a fifth embodiment of the present invention.

11 is a schematic perspective view schematically showing a droplet injection device according to a sixth embodiment of the present invention.

12 is a schematic perspective view schematically showing a droplet ejection device according to a seventh embodiment of the present invention.

13 is a schematic perspective view schematically showing a droplet ejection device according to an eighth embodiment of the present invention;

14 is a conceptual diagram illustrating a state in which a plurality of droplet ejection apparatuses are installed adjacent to each other according to an embodiment of the present invention.

15 to 17 are operation diagrams showing a state in which the droplet injection apparatus according to the embodiment of the present invention operates in a state where a plurality of neighboring neighbors are installed.

18 and 19 are graphs for explaining the AC signal applied from the signal generator of the droplet ejection apparatus according to the embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: nozzle body 102: chamber

104: nozzle 210: first electrode portion

220: second electrode portion 300: signal generator

400: control unit 500: pulse signal unit

A: Printed material IS: Insulation spacer

th: through hole

Claims (18)

In the droplet ejection apparatus for injecting droplets on one surface of the printed matter, A nozzle body including a chamber for accommodating a predetermined amount of fluid supplied from the outside, and a nozzle for injecting droplets of fluid communicated from the chamber and contained in the chamber to one surface of the printed matter; An electrode module attached to or spaced from an outer surface of the nozzle body; A signal generator for inducing charge on the liquid surface of the fluid to form an electrostatic force, and applying an alternating signal to the electrode module such that the electrostatic force is discharged by overcoming the surface tension of the liquid surface of the fluid; And And a controller for controlling the magnitude and frequency of the output signal of the signal generator. The method of claim 1, The electrode module is a droplet ejection apparatus, characterized in that installed in the structure surrounding the nozzle of the nozzle body. The method of claim 1, The electrode module may include a first electrode part attached to or spaced from an outer surface of the nozzle body; And a second electrode part attached to or spaced apart from the outer surface of the nozzle body so as to be spaced apart from the first electrode part. The method of claim 3, And the first electrode portion and the second electrode portion are installed to be symmetrical with respect to the nozzle body of the nozzle body. The method of claim 3, And the first electrode part is spaced apart from one side of the nozzle of the nozzle body, and the second electrode part is spaced apart from another nozzle of the nozzle body. The method of claim 3, And a pair of first electrode portions spaced apart from each other on both sides of the outer surface of the nozzle body, and the second electrode portions are attached to or spaced from the other surface of the printed matter. The method of claim 3, The first electrode unit is integrally spaced apart from both sides of the nozzle body and the nozzle, respectively, and is integrally installed. The through-holes through which the droplets are injected from the nozzle to one surface of the print are formed, and the second electrode unit is formed. Droplet spray apparatus, characterized in that installed on the other surface of the printed matter or spaced apart. The method of claim 1, The nozzle body is a droplet ejection apparatus, characterized in that the nozzle side is formed in a flat plate shape with a small cross section or a cylindrical shape with a small cross section at the nozzle side. The method of claim 3, The first electrode portion and the second electrode portion are laminated with each other via an insulating spacer, wherein the first electrode portion and the second electrode portion laminated to each other is provided attached to the outer periphery of the nozzle Injector. The method of claim 3, The first electrode part and the second electrode part are laminated to each other through an insulating spacer, and the mutually laminated first electrode part and the second electrode part are installed to be spaced apart from the outer circumference of the nozzle, wherein the nozzle Droplet injection device, characterized in that the through-hole is formed through the droplets are sprayed to one surface of the printed matter. The method of claim 3, The first electrode portion is spaced apart from one side of the nozzle body, the second electrode portion is formed in the through hole through which the droplets are injected from the nozzle to one surface of the printed material is spaced from one surface of the printed material Droplet injector, characterized in that installed or spaced apart from the other surface of the printed matter. The method according to any one of claims 3 to 7, and 9 to 10, And a pulse signal unit for supplying a pulse signal at peak points of the alternating signals supplied to the first electrode portion and the second electrode portion. The method of claim 3, A plurality of nozzle bodies including the first and second electrode parts are provided adjacent to each other via an insulating spacer, and the alternating signal is applied to each of the first and second electrode parts of the plurality of nozzle bodies installed next to each other. Droplet ejection apparatus. The method of claim 13, And a plurality of pulse signal units for supplying a pulse signal at peak points of the alternating signals supplied to the first electrode portion and the second electrode portion of each nozzle body. The method of claim 1, And the nozzle of the nozzle body is made of a conductive material. The method of claim 1, And the nozzle of the nozzle body is made of a non-conductive material in which a conductive wire is interpolated. In the droplet injection method for spraying a droplet on one surface of the printed matter, a) providing a nozzle body including a chamber for receiving a predetermined amount of fluid supplied from the outside, and a nozzle for injecting droplets of fluid communicated with and contained in the chamber to one surface of the print; b) installing an electrode module to be attached or spaced apart from one side of the outer surface of the nozzle body; And c) inducing charge to the liquid surface of the fluid to form an electrostatic force, and applying an alternating signal to the electrode module such that the electrostatic force is discharged by overcoming the surface tension of the liquid surface of the fluid; Droplet injection method. In the droplet injection method for spraying a droplet on one surface of the printed matter, a) providing a nozzle body including a chamber for receiving a predetermined amount of fluid supplied from the outside, and a nozzle for injecting droplets of fluid communicated with and contained in the chamber to one surface of the print; b) installing an electrode module to be attached or spaced apart from one side of the outer surface of the nozzle body; c) inducing charge to the liquid level of the fluid to form an electrostatic force, and applying a bias to the electrode module as an alternating signal so that the electrostatic force does not discharge by overcoming the surface tension of the liquid surface of the fluid; And d) applying a pulse signal to the electrode module at the peak point of the alternating signal;

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