KR970009108B1 - Ink-jet print head - Google Patents

Abstract

The ink-jet printer head is designed to obtain a high-resolution image with a means for facilitating the release of ink and the control of the ink release. The ink-jet printer includes a nozzle(8) for discharging the ink to form an image on a recording medium, a venturimeter(5) for generating a pressure difference due to air flow, an ink tank(7) connected to the one end of a large-diameter portion(5a) and a small-diameter portion(5b) of the ventrimeter(5) with a connection part, and magnetic field forming means for controlling the release of the ink.

Description

Inkjet printer head

1 is a schematic configuration diagram of a main device part of a conventional piezoelectric inkjet inkjet inkjet printer head.

2 is a schematic configuration diagram of a main device part of a conventional inkjet inkjet print head of a bubble jet method.

3 is a schematic diagram of a main device part as a first embodiment of an ink jet printer head according to the present invention.

4 is a cross-sectional detail view taken along line III-III in FIG. 3;

5 is a schematic process diagram of image formation in a first embodiment of an ink jet printer head according to the present invention.

6 is a schematic diagram of a main device part as a second embodiment of the ink jet printer head according to the present invention;

7 is a detailed cross-sectional view taken along the line VI-VI in FIG. 6;

* Explanation of symbols for main parts of the drawings

p: piezoelectric element T: ink container

I: Ink PR: Pressure Chamber

N: Nozzle B: Bubble

H: Heater 1a, 1b: Magnetic field forming device

2,2a, 2b: electrode 3: ink

4: outlet 5: venturi meter (venturi meter)

6: recording medium 7: ink bottle

8: nozzle

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet printer head, and more particularly, to an ink jet printer capable of obtaining a high resolution image by providing a means for smoothly discharging and controlling discharge of ink.

Copies, facsimile machines and printers are the so-called hard copyers which detect letters, symbols or images according to corresponding electrical signals and finally form them on paper. Of course, although there are differences in device configuration and operation mechanisms, many devices are quite similar in that an image forming medium called viscous ink (or powder toner) is used to obtain desired final information on the ground. Can be.

FIG. 1 of the accompanying drawings schematically shows the configuration of the main device section in the conventional piezoelectric element type inkjet inkjet printer head which is one of such devices. Referring to this, the viscous ink 1 is filled in the ink container T having a predetermined shape, and a discharge port is formed in a predetermined portion of the upper part of the container T to form a passage with the nozzle N. As shown in FIG. Then, a predetermined pressure chamber PR is connected to the passage between the discharge port of the cylinder T and the nozzle N, and the piezoelectric element P is placed on a body outside the passage facing the pressure chamber PR. It is installed. This method is a method in which ink is ejected by pressurizing ink with a deformation force of a piezoelectric element, and it is difficult to pluralize nozzles, difficult to colorize a head, and has a low response frequency and thus a poor response performance.

FIG. 2 is a schematic configuration diagram based on the operation mechanism of the main apparatus part in the bubble jet type ink jet ink jet printer head which is another conventional form. Referring to the drawings, the ink container, the ink passage filled with the ink I, and the nozzle N are integrated, and a heater H is provided at a predetermined portion of the passage. The ink jet printer head of this type is a method in which ink is instantaneously heated to eject ink into a bubble (B), which comes with a restriction that requires the use of a special ink. There is a disadvantage of being blocked. In addition, due to structural limitations, it is difficult to colorize the head, and also has a disadvantage that the head and the heater are damaged due to the impact of bubble generation and extinction, resulting in shortening of the life of the head.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide an ink jet printer head capable of colorizing a head and having improved ink ejection and control systems.

In order to achieve the above object, an ink jet printer head according to the present invention includes a nozzle for ejecting ink to form an image on a recording medium, a venturi system for generating a pressure difference due to air flow, and a cod of the venturi system. It is characterized by consisting of an ink container connected to one end of the neck portion and the small diameter portion by the communication portion, and a magnetic field forming means for controlling the ejection of ink.

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

3 is a schematic diagram of a main device part as a first embodiment of the ink jet printer head according to the present invention. Referring to this, in the ink container 7 filled with the magnetic ink 3, upper and lower communication portions 7a and 7b are respectively provided at predetermined positions of the upper and lower portions. And the upper communication part 7a is connected to the fixed part of the large diameter part body of the venturi system 5, and the lower communication part 7b is connected to the constant part of the small diameter part of the venturi system 5, and is connected. have. Here, the venturi system 5 uses Bernoulli's theorem which defines the relationship between the pressure and the velocity in the fluid flow, and the air is introduced into the large diameter pipe part, and ink is discharged by the air pressure. The part is a small caliber tube and the bottleneck shape as a whole. In the lower portion of the point where the lower communication portion 7b and the small diameter portion of the venturi system 5 are connected, the electronics 1a and 1b are symmetrical on both sides of the communication portion 7b with the lower communication portion 7b as the axis. It is installed in a structure.

4 is a cross-sectional detail view taken along line III-III in FIG. 3. Referring to the drawings, the electromagnets 1a and 1b provided in a symmetrical structure with the lower communication portion 7b located at the center thereof are connected to the driving circuit d, respectively. The driving circuit D includes a command circuit for flowing current to the electromagnets 1a and 1b according to an electric signal corresponding to an image, and a current for causing reverse force to be generated in the magnetic ink. It has a built-in control circuit.

5 is a schematic image forming process diagram in the first embodiment of the ink jet printer head according to the present invention. Referring to the drawings, FIG. 5 (a) is a state diagram in which a pressure drop is generated at the jet port 4 by a known flow of a constant pressure flowing through the venturi system 5 in a state where no magnetic field is formed. At this time, even when there is no air flow, the magnetic ink 3 in the ink container 7 rises to the uppermost part of the lower communication part 7b by the capillary phenomenon and has already maintained the water level. (b) is a state diagram in which the magnetic ink 3 is ejected by a force toward the U direction by this pressure drop, and (c) is a state diagram in which the ejected magnetic ink 3 is directed toward the nozzle 8 by the flow of air. to be. (d) is a state diagram in which a magnetic field is formed by applying a current to the coils of the electromagnets 1a and 1b to form an image, and the magnetic field and the magnetic particles dispersed in the magnetic ink 3 react to the image signal. Only this ink is discharged through the nozzle 8 to form an image on the recording medium 6, and further ejection is suppressed. (e) is a state diagram which cuts off the current which flowed to the coils of the electromagnets 1a and 1b for suppressing the magnetic ink 3, and is returning to the first stage.

6 is a schematic diagram of a main device part as a second embodiment of the ink jet printer head according to the present invention. As shown, this second embodiment has a plurality of ink bottles 7a, 7b, 7c, 7d and ejection openings 4a, 4b, 4c, which have a single ink container 7 and a jet port 4 in the first embodiment. 4d) changed form. Accordingly, each is provided by one adapted to the axis, each outlet has a lower electromagnet (1a-1h) the lower connecting part _{(7b 1, 7b 2, 7b} 3, 7b 4,). The four ink bottles 7a-7d are filled with Y (Yellow), M (Magenta), and B _k (Black) magnetic ink (3a, 3b, 3c, 3d) separately, and based on these four colors, A color image is thus formed. The process of forming an image is performed in the same manner as the image forming process in the first embodiment.

FIG. 7 is a cross-sectional detail view taken along line VI-VI in FIG. 6. Referring to the drawings, each pair of electromagnets 1a-1h provided at each side of each of the ejection openings 4a-4d at the lower communication portion is connected to the driving circuit D 'individually to form an independent circuit. . The driving circuit D 'also has a command circuit for flowing a current corresponding to an image signal to the electromagnets 1a-1h in the same manner as the driving circuit d in the first embodiment, and reverse to the magnetic ink. The control circuit for flowing a current to the electromagnets 1a-1h to generate a force of?

As described above, the ink jet printer head according to the present invention, unlike the conventional ink jet printer head, is easy to colorize the head, facilitates ejection and ejection control of ink, and thus obtains a high resolution image. It will have a superior advantage in the market competitiveness of the product to which the present invention is applied.

Claims (4)

A nozzle 8 for ejecting ink to form an image on the recording medium, a venturi system 5 for generating a pressure difference due to air flow, and a large diameter portion 5a and a small diameter portion of the venturi system 5 ( An ink jet printer head comprising: an ink container (7) connected to one end and a communicating portion of 5b), and magnetic field forming means (1a, 1b) for controlling the ejection of ink. The ink jet printer head according to claim 1, wherein the venturi system (5) has a large diameter portion (5a) in which air is introduced and a small diameter portion (5b) in which ink is discharged. The magnetic field forming means (1a, 1b) according to claim 1, characterized in that at least two electromagnets are provided outside the communication portion (7b) communicating with the small-diameter portion (5b) of the venturi system (5). Inkjet printer head. The method of claim 1, wherein the outside of the ink passage 7 and the connecting part (7a, 7b) and is provided with a plurality, globule diameter portion 5 and the communication connection part (7b ₁ -7b ₄₎ is a venturi rigye 5 Inkjet printer head, characterized in that each of the electromagnet is provided at least two places.