KR101080921B1 - Conjugate type ink jet print head - Google Patents

Abstract

The present invention relates to a head of an ink jet print, and in particular, a plurality of bonding plates are in close contact with each other, but an ink input passage into which ink is input by engraving or embossing one contact surface thereof, and the ink input passage communicates with the ink input passage. The present invention relates to a bonded ink jet print head capable of easily adjusting the size of the nozzle by forming a nozzle for injecting ink toward the printing object side.

Bonded Printheads, ESD, Piezo Actuators

Description

Bonding type ink jet print head {Conjugate type ink jet print head}

The present invention relates to a head of an ink jet print, and in particular, a plurality of bonding plates are in close contact with each other, but an ink input passage into which ink is input by engraving or embossing one contact surface thereof, and the ink input passage communicates with the ink input passage. The present invention relates to a bonded ink jet print head capable of easily adjusting the size of the nozzle by forming a nozzle for injecting ink toward the printing object side.

The ink jet printing method is a method of spraying ink onto an ink object to perform a print job, as is widely known.

The ink jet printing method is largely divided into a heating method and a piezoelectric element method.

The heating method uses heat to inject ink. When an electrical signal is applied to the resistance of the ink cartridge head, the heating is rapidly heated to generate bubbles, and the ink is pushed out of the head and printed on the printed object. When the bubble shrinks, new ink is supplied to the head to fill the ink.

The advantage of this product is its very simple head structure. The heater portion capable of transferring heat is positioned in the middle of the ink chamber and the portion where the head is, that is, above the head. Ink is ejected by using the force of bubbles generated by heating the heater above the head.

This method is similar to the bubble jet method, and even if air bubbles enter the ink chamber, they are easily released together with the ink, and the ink is less clogged. In addition, the simple structure has the advantage that it is easy to increase the number of nozzles. On the other hand, since only a certain size of ink is ejected for each nozzle, the printing speed decreases as the ink is ejected to the same place repeatedly for several times.

Piezo actuator type (Piezo Actuator) is divided into a method of spraying using a piezo piezoelectric (Piezo Electric) or ceramic piezoelectric (Ceramic Electric).

The piezoelectric piezoelectric is a method of spraying ink at a mechanical pressure by using a piezo actuator.

When the printer sends an electric signal to the piezoelectric element, the piezoelectric element vibrates and ink is pushed out of the nozzle hole by the pressure of the vibration. The escaped part is filled by the phenomenon of Moses and the law of inertia.

In addition, the ceramic piezo is operated by reciprocating the stretched state and the reduced state of each crystal by applying or removing an electric field in the same direction after the polarization of the ceramic.

The ink jet print head 10 by the piezoelectric actuator method will be described with reference to FIGS. 1 and 2.

1 is a perspective view of the ink jet print head 10 and FIG. 2 is a conceptual view illustrating a cross section of the head 10.

As shown, an ink inlet 11 is formed at one side of the ink jet print head 10.

After the ink flows from the ink reservoir (not shown) to the ink inlet 11, ink is introduced into the ink jet print head 10 through the ink inlet 11.

The introduced ink is introduced into the chamber 13 through the channel 12.

The ink introduced into the chamber 13 is injected through the nozzle 15, and at this time, the piezoelectric actuator 14 as described above is deformed to eject the ink.

The piezoelectric actuator method is advantageous in that the ejection of ink can be precisely controlled by the current control.

By adjusting the time for controlling the current of the piezoelectric element when the ink bubble swells, it is possible to control the size of the ink ink to be pushed out.

As a result, the nozzle is large and ink droplets can be made small, and the multi-size dot function of making ink droplets of various sizes with one nozzle can be realized. This multi-size dot function can be used to adjust the size of the dot according to the printed body, which helps in speed improvement.

The disadvantage is that the size of the nozzle is large, it is difficult to increase the number of nozzles and the nozzles are often clogged. In order to solve this problem, air is discharged by cleaning before printing, but it is not a fundamental problem solving method.

In addition, the ink used in the piezoelectric element method has a viscosity of about 12 to 15 cps, so if the ink is not continuously heated, the ink easily coagulates, which causes nozzle clogging.

In addition, as mentioned above, the ink used in the piezoelectric actuator method has a predetermined viscosity so that the ink must be discharged in the form of droplets when printing, but in reality, ink tails are formed that the ink droplets elongate under the influence of viscosity. The same phenomenon as the sagging phenomenon) The size of the printed dot is not fixed, which causes a problem in that print quality is reduced.

In order to solve this problem, an electrostatic deposition (ESD) method is proposed.

The method was developed to control the electrostatic field to deposit proteins or charged nanoparticles on a specific area of the conductive substrate. The deposition amount can be controlled by the size of the droplet, the concentration of the sample, the injection time, and various patterns. It can be deposited at the same time, so that it is possible to spray a large area at high speed.

The principle of electrostatic induction deposition is briefly explained through the conceptual diagram of FIG. 3.

As shown in the figure, a nozzle 21 having a small diameter for discharging ink is located above, and a ground 22 is located directly below. At this time,

When the positive or negative voltage is applied to the nozzle 21 and the negative or negative voltage is applied to the ground 22, the conductive ink passing through the nozzle 21 is applied. It is charged to the same pole as the nozzle 21, so that the conductive ink is printed on the printed object (not shown) on the ground 22 by the attraction force (magnetic force) with the ground 22 of the opposite electrode.

Such electrostatic induction deposition has the advantage of eliminating the nozzle clogging phenomenon in the previous piezoelectric element method.

However, in the case of using the above-described piezoelectric actuator or the ESD method, there is a problem in that the diameter of the nozzle cannot be freely adjusted so that it is not possible to actively cope with changes in the printing environment.

In addition, in the case of the ESD method as described above, the electrode must be installed, but there is a problem in that the thickness of the electrode is difficult to install.

The present invention is to solve the above-mentioned problems, a plurality of bonding plates are in close contact with each other, but the ink input passage in which ink is introduced by engraving or embossing one of the contact surfaces, and the ink is connected in communication with the ink input passage is printed It is an object of the present invention to provide a bonded ink jet print head which can freely change the size of the nozzle and to facilitate electrode installation by forming a nozzle to be sprayed to the object side.

In order to achieve the above object, the present invention provides an ink jet print head in which ink is sprayed onto a printing object to perform a printing operation, wherein a plurality of bonding plates are in close contact with each other, and ink is injected by engraving or embossing one of the contact surfaces. The inkjet printhead is characterized in that it further comprises an ink inlet passage and a nozzle in communication with the ink inlet passage so that the injected ink is ejected toward the printing object side.

In addition, the print head includes two pairs of bonding plates having a plate-like shape as being in close contact with each other, the ink input passage formed by engraving a region of one side or both sides of the opposing surfaces of any one pair of bonding plates, The through hole penetrating one junction plate region of the pair of bonding plates, and formed in the junction plate formed with the through hole, the thickness of the region from one end of the opposite surface to the through hole thinner than the surroundings And a nozzle in communication with the through hole by close contact with an adjacent bonding plate, wherein the ink flowing through the ink injection path is sprayed through the through hole and the nozzle. have.

At this time, it is also possible to further include a supply means for pressurizing and transferring the ink to the ink input path side.

In addition, it is also possible to further include an electrode provided in the bonding plate in close contact with each other, and a ground provided in one region of the bonding plate.

In addition, it is also possible to further include a piezoelectric actuator mounted on one side of the bonding plate.

In addition, it is also possible to further include an electrode mounting groove penetrating from the outer side in the thickness direction of the bonding plate on which the nozzle is formed to the area where the nozzle is formed.

The ink jet print head of the present invention as described above can freely adjust the diameter of the nozzle and facilitate the installation of the electrode.

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

4 is a conceptual diagram showing the concept of the bonded ink jet print head of the present invention.

5 to 7 is a cross-sectional view and an exploded perspective view and a rear view of an embodiment of the present invention, Figure 5 is a cross-sectional view of the two pairs of bonding plates in close contact, Figure 6 is a pair of the separation of the bonding plate One is an exploded perspective view and FIG. 7 is a rear view of one bonding plate.

First, the principle of the present invention will be described with reference to FIG.

As described above, the ink jet print head 100 of the present invention forms an ink feeding path R1 through which the plurality of bonding plates 110 and 120 are brought into close contact with each other, and an area of the contact surface is engraved or embossed with ink. .

In addition, as described above, one area of the contact surface is engraved or embossed to form a nozzle R2 which communicates with the ink input passage R1 and allows the injected ink to be sprayed toward a printing object (not shown). .

In other words, a passage formed by engraving or embossing an area of the contact surface of the plurality of bonding plates 110 and 120 is used.

Hereinafter, the present invention will be described in detail through examples.

Example

The ink jet print head 100 to be described in this embodiment performs printing by spraying ink onto a printing object as described above.

In this case, the print print head 100 includes two pairs of bonding plates 110, 120, 130, and 140 which are in close contact with each other and have a plate shape.

In this embodiment, as shown in FIG. 5, the first bonding plate 110, the second bonding plate 120, the third bonding plate 130, and the fourth bonding plate 140 are referred to from the left side, respectively.

Therefore, the first bonding plate 110 and the second bonding plate 120 is a pair of bonding plates, the remaining third and fourth bonding plates (130, 140) is another pair of bonding plates.

At this time, one area of one side or both sides of the opposite surface of the pair of bonding plates of the two pairs of bonding plates are engraved to form an ink injection path (R).

In the present exemplary embodiment, as shown in FIGS. 5 and 6, recesses 111 and 112 are engraved on the first junction plate 110 and the second junction plate 120, respectively, and then the first and second junction plates ( It is illustrated that the ink input path R is formed by allowing the 110 and 120 to be in close contact with each other.

In addition, it is illustrated that the third junction plate and the fourth junction plates 130 and 140 are also formed in the same manner as the first and second junction plates 110 and 120.

However, the ink input path (R) is intended to allow the ink to be injected from the ink reservoir (not shown), so that the ink input path (R) has a different shape as long as this object is achieved. In any case, it belongs to the scope of the present invention.

For example, even if the contact surface of one of the contact surfaces of the first and second bonding plates (110,120) is engraved or formed by embossing any one or all the contact surfaces of the contact surface are all of the present invention It belongs to a category.

In addition, in the present embodiment, it is illustrated that the ink input passages R of the first and second bonding plates 110 and 120 and the third and fourth bonding plates 130 and 140 have the same shape, but the present invention is not limited thereto. And all of them belong to the scope of the present invention even if they do not have the same shape as long as the ink can flow.

In this regard, FIG. 6 shows only the first and second bonding plates 110 and 120 separately.

In addition, it is shown that the ink input path (R) is formed to extend to one end of the first and second bonding plates (110, 120).

This is to allow the end of the ink input path R to open when the first and second bonding plates 110 and 120 are in close contact with each other so that ink may flow from an ink reservoir (not shown).

In addition, in the present embodiment, the first to fourth bonding plates 110, 120, 130, and 140 are provided with main bodies 111, 121, 131, and 141 having plate shapes.

However, the main body 111, 121, 131, 141 is to form the ink input path (R) and the nozzle (N) to be described later by engraving or embossing one of the contact surfaces as described above, as long as the main purpose (111, 121, 131, 141) is achieved. Naturally, even if it has a different shape, it belongs to the scope of the present invention.

On the other hand, the ink jet print head 100 of the present invention is one of a pair of bonding plates (first and second bonding plates 110 and 120 in this embodiment) (second bonding plate 120 in this embodiment) ) Includes a through hole 123 penetrating one region.

The through hole 123 allows the ink introduced through the ink input path R to flow to the nozzle N side, which will be described later.

Meanwhile, the ink jet print head 100 of the present invention includes a nozzle N for ejecting ink.

The nozzle N is formed on the bonding plate (second bonding plate 120 in this embodiment) in which the through hole 123 is formed, and the opposing surfaces (ie, the first and second bonding plates 110 and 120) are formed. Bonding plate (in this embodiment, adjacent step) 124 formed in the thickness of the area from one end of the opposite side of the contact surface (lower end in the drawing) to the through hole 123 is thinner than the surroundings. The third bonding plate 130 is formed in close contact with each other.

That is, after forming the lower end of the second bonding plate 120 and the lower end of the third bonding plate 130 so as to have a smaller thickness than the surrounding step (124, 134, see Fig. 5), respectively, the second and third bonding plate The nozzles N are formed by bringing the 120 and 130 into close contact with each other.

In the present exemplary embodiment, the stepped portions 124 and 134 are formed on the second and third bonding plates 120 and 130, respectively.

However, this aims to provide a movement path so that ink introduced from the through hole 123 to be described later can be ejected to the outside, so that the step 124 and 134 have different shapes as long as the object achieves this purpose. In other words, even if the nozzle N has a different shape, it belongs to the scope of the present invention.

As described above, the through hole 123 penetrates through a region of one bonding plate (the second bonding plate 120 in this embodiment) of the pair of bonding plates.

At this time, the through hole 123 is formed to communicate with the ink inlet (R).

In other words, when the first and second bonding plates 110 and 120 are in close contact with each other, the ink introduced through the ink input path R may flow to the nozzle N after passing through the through hole 123. Is formed.

To this end, the through hole 123 is preferably formed to be in contact with the ink inlet (R).

On the other hand, it is also possible to further include an ink distribution passage 113 in the ink input passage (R).

The ink dispensing passage 113 is formed at one side of the ink input passage R, but is formed to be branched from one side of the ink input passage R to communicate with the through hole 123.

The ink passing through the ink distribution passage 113 flows to the nozzle N through the through hole 123.

In this embodiment, the ink distribution passage 113 is formed in the downward direction on the drawing of the ink input passage (R), but is engraved.

However, the ink distribution passage 113 of the present invention is intended to allow ink to flow to the through hole 123 side, so that the ink distribution passage 113 has a different shape as long as this object is achieved. In any case, it belongs to the scope of the present invention.

In addition, in the present embodiment, three ink distribution passages 113 are illustrated.

It is clear that the three through holes 123 and three nozzles N are formed so that only three are formed so as to correspond thereto, and the present invention is not limited by the number thereof.

The process of injecting and ejecting ink by the bonded ink jet print head 100 of the present invention as described above will be described again with reference to FIGS. 5 and 6.

However, FIG. 5 illustrates a case in which both pairs of bonding plates have the same shape but have symmetrical shapes, and the present invention is not limited thereto.

First, ink flows from an ink reservoir (not shown), which flows through the ink input path (R).

The introduced ink flows to each of the through holes 123 and 133 through the ink distribution passage 113.

The ink passing through the through holes 123 and 133 is ejected to the outside through the nozzle N formed by closely contacting the stepped portions 124 and 134.

The size of the nozzle N can be freely adjusted by the bonded ink jet print head 100 of the present invention as described above.

That is, as described above, the nozzle N of the present invention is formed by the stepped portions 124 and 134 being in close contact with each other.

Accordingly, by adjusting the thickness of the stepped portions 124 and 134, the size (diameter) of the nozzle N may be easily adjusted.

On the other hand, it is also possible to further include a supply means for pressurizing and conveying the ink to the ink inlet (R) side in order to allow the ink to be introduced, injected.

A pump can be used as said supply means.

It is also possible to take the ESD print scheme as described above to improve the print quality by the ink jet print head 100 of the present invention.

To this end, it may include an electrode (E) installed in the bonding plate in close contact with each other, and a ground (G) installed in one region of the bonding plate.

In this case, the electrode mounting groove 125 may be further included to mount the electrode E, which will be described with reference to FIGS. 5 and 7.

The electrode mounting groove 125 has the nozzle N from the outer side in the thickness direction of the junction plate (in this embodiment, the second junction plate 120 and the third junction plate 130) in which the nozzle N is formed. It is illustrated to penetrate to the region to be formed.

Of course, in FIG. 7, the electrode mounting groove 125 is formed in the second bonding plate 120, but as shown in FIG. 5, the electrode mounting groove 125 is formed on the third bonding plate 130. It is also possible to be mounted between the second and third bonding plates (120, 130).

In other words, the first and second bonding plates 110 and 120 and the third and fourth bonding plates 130 and 140 have the same shape, but the third and fourth bonding plates 130 and 140 are the first and the second bonding plates. It is arranged to be symmetrical with the plate (110,120).

On the other hand, the ground (G) is shown in the lower direction on the drawing of the bonding plates 110, 120, 130, 140 in FIG.

This is conceptually described as the ground (G) required to perform the ESD printing method, it is clear that the present invention is not limited by the position or shape of the ground (G).

On the other hand, as shown in FIG. 7, the electrode E may include an electrode assembly EA including an electrode body E1 and a plurality of branch electrodes E2 branched from the electrode body E1.

This is a problem that it is difficult to mount the electrode is mounted on the junction plate is very thin.

In order to solve this problem, the present invention can be easily mounted by inserting the branch electrode E2 into the electrode mounting groove 125 after the worker grips the plate-shaped electrode body E1 as described above. .

On the other hand, in addition to the above-described ESD printing technique, it is also possible to include a piezoelectric actuator so that the injection of the ink efficiently.

That is, as shown in FIG. 5, a piezoelectric actuator P may be installed at one side of the bonding plates 110, 120, 130, and 140 to help deform the bonding plates 110, 120, 130, and 140 to finely eject the ink.

In the present embodiment, it is illustrated that the left side in the drawing of the first bonding plate 110 and the right side in the drawing of the fourth bonding plate 140, respectively.

Of course, it is obvious that a control unit (not shown) for controlling the supply of power to the piezoelectric actuator P is obvious, but since it is a well-known technology, detailed illustration and description are omitted.

Although the piezoelectric actuator P is conceptually illustrated in the present embodiment, a piezoelectric piezoelectric or ceramic piezoelectric may be used as described above.

On the other hand, the material of the bonded ink jet print head 100 of the present invention is not particularly limited, but glass may be used as the material.

This is because the use of the glass is advantageous for improving the adhesion.

1 is a perspective view of an ink jet print head 10,

2 is a conceptual diagram showing a cross section of the head 10;

3 is a conceptual diagram showing the principle of electrostatic induction deposition;

4 is a conceptual diagram showing the concept of the bonded ink jet print head of the present invention.

5 is a cross-sectional view of a state in which two pairs of bonding plates are in close contact;

6 is an exploded perspective view of a pair of bonding plates separated;

7 is a rear view of one bonding plate.

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

100: print head 110 of the present invention: first bonding plate

120: second bonding plate 130: third bonding plate

140: fourth bonding plate R: ink input passage

N: nozzle E: electrode

G: Ground P: Piezoelectric Element

Claims (9)

delete An ink jet print head which sprays ink onto a printing object to perform a print job, The print head includes two pairs of bonding plates having a plate shape as being in close contact with each other, An ink input passage formed by engraving an area of one side or both sides of opposing surfaces of any one pair of bonding plates, A through hole penetrating through a region of one of the pair of bonding plates and communicating with the ink input passage; The nozzle is formed in the junction plate formed with the through hole, the thickness of the area from one end of the opposite side of the opposite surface to the through hole is made thinner than the surroundings, and the nozzle communicates with the through hole by close contact with the adjacent joining plate. And ink, which is introduced through the ink input passage, is injected through the through hole and the nozzle. 3. The method of claim 2, And a supply means for pressurizing and conveying ink toward the ink input passage side. 3. The method of claim 2, And an electrode disposed on the mutually intimate bonding plate, and a ground disposed in one area of the bonding plate. 3. The method of claim 2, Bonding type ink jet print head, characterized in that it further comprises a piezoelectric actuator mounted on one side of the bonding plate. 3. The method of claim 2, And an electrode mounting groove penetrating from the outer side in the thickness direction of the bonding plate in which the nozzle is formed to the region in which the nozzle is formed. The method of claim 6, As installed in the electrode mounting groove And an electrode assembly having a plate-shaped electrode main body and a branched electrode formed to be branched from the main body and inserted into the electrode mounting groove, respectively. 3. The method of claim 2, The inkjet printhead of claim 1, further comprising an ink distribution passage formed on one side of the ink input passage and branched from one side of the ink input passage to communicate with the through hole. 3. The method of claim 2, The bonding plate is a bonded ink jet print head, characterized in that glass is used.

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