Method of inkjet printing and inkjet printhead for its implementation


B41J2/015 - for serial printing

 

(57) Abstract:

The invention relates to methods and apparatus for inkjet printing and can be used to apply information to the media. The essence of the invention is that ink jet printing is carried out by focusing a light beam of a quantum generator in liquid nozzle supplies the printing material from its open end, in front of which is placed a storage medium, the excitation pulse pressure, ensuring the ejection of droplets of liquid on the medium. When this light beam is directed to the material in the nozzle at an angle to its surface between the nozzle and the carrier, or through transparent to the wavelength of the beam carrier. Inkjet printhead has a series of nozzles with one muffled face formed in the body of the drive pulley. The head is provided with a means for supplying liquid consumable print material in the nozzle through their open ends and means for creating a pressure impulse in the nozzles containing quantum generator of a light beam with a device to focus on the liquid material from the open ends of the nozzles, which is placed before the media, and the deflection device SV is particular to printing devices. More specifically the invention relates to a method of inkjet printing and print heads for such printing, designed for contactless application information on a variety of paper type paper, film, plastic, etc.

There is a method of inkjet printing, which consists in placing media opposite the jet nozzle, filled with liquid consumable print material, and excitation in these nozzles pressure pulses for batch feeding of the printing material on the recording media [1] In the known method the pulse pressure in the nozzles create due to pulsed heating the liquid printing material, leading to evaporation in the heating zone, the rapid expansion of the liquid and the ejection of the drops from the nozzle.

The disadvantage of this method is that the source of thermal effects on the liquid printing material is placed directly into each nozzle and control it from the outside, which complicates the implementation of this method when a large number of nozzles. In addition, this method does not allow to obtain a high frequency of ejection of the droplets, i.e., before initiation of the next pulse of pressure is necessary to lower the temperature in the nozzle for flowing into it next portion of W contains as many resistors for heating the liquid material, as nozzles. Each resistor has a current lead that connects it to the source voltage. To eject drops from a nozzle at the bottom of the food chain of the corresponding resistor. During the flow through it of the current pulse can be heated, heats are in the area of its location liquid material to a vapor state, resulting in a fluid, expands and creates a shock impulse, throwing her drop through the nozzle. Then, after cooling liquid, the described process can be repeated.

The drawback of such heads is constructive complexity, since it must have the number of resistors in the number of nozzles, mounted with a small step between a and equipped with a system of electrical power supply; a low resolution, because these nozzles with resistors cannot be placed with a small step; low reliability, because the repeated pulse heating resistors to a sufficiently high temperature determines their limited service life; low productivity, because the subsequent ejection of drops from the nozzle is only possible after the reduction in temperature and flowing into him the next portion of the liquid consumable print material.

In oslobodenje directly in the cylinder, a source of shock pulses to eject ink drops of fluid from its nozzles, has simplified its design, improved reliability and durability, increased resolution and speed.

The problem is solved in that in the method of ink jet printing, consisting in placing media opposite the jet nozzle, filled with liquid consumable print material, and excitation in these nozzles pressure pulses for batch feeding of the printing material on the recording media in accordance with the invention, use of a nozzle with butt plugged on the side opposite to the placement of media and focus the light beam quantum generator liquid consumable print material from the open end of the nozzle, in front of which is placed media for the excitation pulse pressure, ensuring the ejection of droplets of the material to the media.

In this way, the source impact on liquid consumable print material is outside of the nozzle, which makes it possible for a large number of nozzles.

It is advisable that the quantum beam generator is directed at an angle to the surface in the nozzle of the liquid printing material between the butt-end of the nozzle and the media.

It is advisable that you use is transparent to a predetermined wavelength emitted from the quantum generator, carrier and sent through him a light quantum beam generator located in the nozzle of the liquid printing material.

In this way provide the best possible convergence between media and nozzles with liquid printing material and facilitate its implementation.

The problem is solved also by the fact that in ink-jet printhead containing a number of nozzles, liquid filled consumable print material, means for feeding the printing material in the nozzle, means for creating a pressure impulse in nozzles for batch submission of this material on the storage medium in accordance with the invention, the nozzle with one muffled face formed in the body of the rotation of the drum, their open ends are located on its surface lines, the axis of each nozzle in the exit point on the surface of the drum is to it tangentially, means for supplying liquid consumable print material in the nozzle is made with cosmogony the light beam generator with a device for its focus on liquid consumable print material from the open ends of the nozzles, in front of which is placed the carrier, and a device for deflection of the light beam on the ends.

When you inkjet printhead simplifies its construction, since the nozzles of the head missing items impact on liquid material, increases the reliability of its work by simplifying the design and the exclusion from it of the parts operating in the mode of extreme temperatures; increases its resolution, because the diameter of the nozzles can be reduced to the diameter of the light beam of the quantum generator and the pitch between the nozzles can be reduced almost to a value slightly greater than the diameter of the nozzle, i.e. the resolution of the head approaches theoretically possible; increased performance; because due to the rotation of the drum with nozzles under the influence of a light beam of a quantum generator are sequentially fed to a series of nozzles, already filled with liquid consumable print material.

It is advisable that muted the Foundation of the nozzles are in the form of a sphere.

This embodiment of the head will encourage more efficient ejection of droplets of the material to the media after getting into the nozzle length Lucio material in the nozzle contains a bath with this material, the drive roller, transferring the material from the bath to the surface of the drum when it is rotating to fill nozzles, and a knife, removing from the surface of the drum over the paint.

This embodiment of the head allows for quick and easy fill nozzle, eliminating the dependence of entering them liquid material from the temperature at the nozzles after ejection of a drop.

It is advisable that a light ray quantum generator was directed at an angle to the surface in the nozzle of the liquid printing material between the butt-end of the nozzle and the media.

This embodiment of the head allows you to provide a droplet ejection of material from the nozzle axis, regardless of the angle of incidence of the light beam quantum generator on the surface of the liquid material in the nozzle and to simplify its construction.

It is advisable that the media was performed transparent to a predetermined wavelength emitted from the quantum generator and placed on the path of the light beam to the surface in the nozzle liquid consumable print material.

This embodiment of the head allows you to bring together media and nozzle to create its compact design

In dallascatalina and accompanying drawings, in which: Fig. 1 illustrates the proposed method of inkjet printing when directed at an angle to the surface of the liquid material in the nozzle length is better quantum generator; Fig. 2 the proposed method inkjet printing with the beam of light quantum generator to the surface of the liquid material in the nozzle, through the medium transparent to wavelength; Fig.3 - General view of the proposed ink-jet printhead. The dashed line shows one of the possible options for passing a light beam of a quantum generator to the nozzles with the liquid material; Fig.4 section p P Fig. 3.

The proposed method of inkjet printing is as follows.

The information carrier C (Fig.1) is placed opposite the nozzle B, filled with liquid consumable print material. Then focus on liquid printing material light beam quantum generator that is In accordance with the opening Svetogidravlichesky effect", described in the Journal of experimental and theoretical physics", 1963 T. 44, vol. 6, page 218, when the absorption inside the liquid light beam quantum generator occurs shock pulse. Using this effect, shock pulse create directly in the nozzle B, filled with liquid PE the ASS="ptx2">

Likewise hits the media, the liquid drop when the beam of light to the surface of the liquid material after In through transparent to the wavelength of the carrier (Fig.2).

From the above description of the proposed method it is obvious that the source of the impact on the liquid material is outside of the nozzle, which improves print quality by reducing the diameter of the drops and increase the density of their location on the storage media.

For carrying out the method of inkjet printing it is necessary to provide a filling nozzle liquid consumable print material and scanning the light beam quantum generator on the open ends of the nozzles. This is done using an inkjet printing head shown in Fig. 3.

We offer inkjet printhead includes a number of nozzles 1 with one muffled face formed in the body of the drum 2, provided with a rotation drive (Fig. not shown). The open ends of the nozzles 1 are arranged on the surface of the drum 2 is near. The axis of each nozzle in the exit point on the surface of the drum 2 is to it tangentially. Plugged the Foundation of the nozzle 1 is made in the form of a sphere. 3 Krytie ends and contains a bath with 4 material the drive roller 5, bathing in the tub 4 and preimages to the surface of the drum 2 and the knife 6. The means 7 for generating a pressure pulse in nozzles 1 contains quantum generator 8, the light beam 9 from the device for its focus on 10 liquid consumable print material from the open ends of the nozzles 1, which is placed before the carrier 11 and the device 12 for deflection of the light beam 9 to these ends.

We offer inkjet printhead works as follows.

During the rotation of the drum 2 and the roller 5 liquid consumable print material fills the nozzle 1 through their open ends. The series is filled with liquid material nozzles 1 are received in the location area of the carrier 11. in accordance with a given program beam 9 quantum generator 8 focus using the device 10 for the liquid material from the open ends of the respective nozzles of this series. When the absorption inside the liquid respective nozzles 1 of the light beam 9 occurs svetogidravlichesky effect, resulting in a shock pulse is amplified by the field muted ends of these nozzles, and the liquid droplets of these nozzles are carried on the carrier 11. Then the rotating drum 2 sums under scan lla 11 and the rotation of the drum 2 on the media do not receive a set of points, the components of the text or image.

The principle of the proposed head does not depend on whether the beam 9 quantum generator 8 to the liquid in the nozzle 1 at an angle between the carrier 11 and the surface of the liquid in the nozzle, or through transparent to the wavelength of the beam carrier 11.

Inkjet printhead is designed for visual display with high resolution and speed of text or graphic information on media of any type.

1. Method of inkjet printing, which consists in placing media opposite the inkjet nozzles, filled with liquid consumable print material, and the excitation in these nozzles pressure pulses for batch feeding of the printing material on the recording media, characterized in that use nozzles with butt plugged on the side opposite to the placement of media and focus the light beam quantum generator liquid consumable print material from the open end of the nozzle, in front of which is placed media for the excitation pulse pressure, ensuring the ejection of droplets of the material to the media.

2. The method according to p. 1, characterized in that the beam quantum generla and media.

3. The method according to p. 1, characterized in that use is transparent to a predetermined wavelength emitted from the quantum generator, media and sent through him a light quantum beam generator located in the nozzle of the liquid printing material.

4. Inkjet printhead containing a number of nozzles, liquid filled consumable print material, means for feeding the printing material in the nozzle, means for creating a pressure impulse in nozzles for batch submission of this material on a data carrier, characterized in that the nozzle with one plugged end is formed in the body driven in rotation of the drum, their open ends are located on its surface lines, the axis of each nozzle in the exit point on the surface of the drum is to it tangentially, means for supplying liquid consumable print material in the nozzle is configured to fill them through the open ends, and means for creating a pressure impulse in the nozzle contains a quantum generator of the light beam with the device for its focus on liquid consumable print material from the open ends of the nozzles, which is placed before the media, and a device to reject svetovoy in the form of a sphere.

6. Head on p. 4, characterized in that the means for feeding the liquid consumable print material in the nozzle contains a bath with this material, drive roller, transferring the material from the bath to the surface of the drum when it is rotating to fill nozzles, and a knife, removing from the drum surface excess material.

7. Head on p. 4, characterized in that the light quantum beam generator is directed at an angle to the surface in the nozzle of the liquid printing material between the end of the nozzle and the media.

8. Head on p. 4, characterized in that the information carrier is made transparent to a predetermined wavelength emitted from the quantum generator and placed on the path of the light beam to the surface in the nozzle liquid consumable print material.

 

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