JPH06247037A - Recording method and device by static spring-out of ink - Google Patents

Abstract

PURPOSE:To provide a method which is an ink recording method, necessitates low energy, has no jetting deviation, using ordinary paper and even long-sized paper easily by possessing simple constitution, having swift responsive speed and no trail. CONSTITUTION:A slit or a nozzle 23 opening upwardly is formed between electrodes 21, 22 facing on each other, ink 24 having a high dielectric constant is put within the slit or the nozzle, electrostatic force based on a difference in dielectric forces between the ink and an air layer is operated to the surface of the ink by applying voltage to a space between the electrodes 21, 22 are sprung through the tip of the slit or the nozzle 23 by moving the ink and a printed body 13 such as ordinary paper close to the slit or the nozzle is printed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink recording system used in various printers, and in particular, an electrostatic force is applied to a high dielectric constant ink or a high dielectric substance so that the high dielectric constant ink is directly discharged into a nozzle. The present invention relates to a method of printing on an object to be printed such as paper by letting it out from the tip of a slit or slit, or letting adjacent ink come out from the tip of a nozzle or slit by deformation of a high dielectric material.

[0002]

2. Description of the Related Art An ink jet method is one of ink recording methods. There are an electrostatic suction method in which an ink droplet is ejected from a nozzle by using electrostatic force, a bubble jet method in which an ink droplet is ejected by forming a bubble by heating, and the like. In general, the ink jet system has excellent features such as less noise and high-speed printing as compared with the impact type printer.

However, the disadvantages common to all ink jet systems are: (1) Plain paper cannot be used. (2) Since the ink is ejected, a large amount of energy is required. (3) Since the ink is ejected, there is a difference in the landing position between the nozzles, which deteriorates the image. (4) Since the head structure is complicated, it is expensive, and a long head with the full width of the paper cannot be formed, which limits the speeding up. There are drawbacks such as.

In addition to the ink jet method, a thermal rheography method is known. this is,
It has a structure as shown in FIG. That is, the solid ink 2 is filled in the ink chamber 1, the thermal head 3 is arranged below the ink chamber 1, and the recording paper 4 is pressed under the platen roller 5 under the thermal head 3. Thermal head 3
A nozzle 6 that communicates with the ink chamber 1 is formed in the nozzle.

The printing operation of this apparatus will be described with reference to FIG. When the thermal head 3 is energized, the hatched portion around the nozzle 6 is heated by Joule heat (FIG. 10 (a)). Then, the portion 2'of the solid ink in contact with the nozzle is melted (FIG. 10 (b)). The melted ink 2'falls downward in the figure, passes through the nozzle 6, and is transferred and recorded on the recording paper (Fig. 10 (c)).

This method has a simple structure and is easy to maintain. Moreover, the contrast of the recording pattern is high and the image quality is high. It has various characteristics such as.

However, it takes time because the solid ink is heated and melted to print, and the head is moved after cooling and curing.
Same as the thermal transfer method, for example, 1 line is 1-10msec
It takes. In contrast, in electrophotography, the process speed is
At 100 to 1000 mm / sec, one line is 0.1 to 1 msec, and the speed is too slow. If the head moves before the melted ink solidifies, the ink on the paper is dragged by the head and becomes a trail, which stains the background.

[0008]

SUMMARY OF THE INVENTION The present invention is basically to eliminate the drawbacks of the ink jet system and the thermal rheography system. That is, it is an object of the present invention to provide an ink recording method that requires less energy, does not cause deviation in flight, can use plain paper, has a simple configuration and can be easily elongated, has a high response speed, and does not cause tailing or the like. I am trying.

[0009]

In order to achieve the above-mentioned object, the present invention forms slits or nozzles that open upward between opposing electrodes, and inserts slits or nozzles to the extent that water ink is not filled. , A voltage is applied between the opposing electrodes to cause an electrostatic force based on the difference in the dielectric constant between the ink and the air layer to act on the surface of the ink, and the ink is moved to spring out from the opening end of the slit or nozzle. It is characterized in that the printing is performed on the printing object close to the slits and nozzles.

Alternatively, slits or nozzles that open upward are formed between opposed electrodes, a high dielectric material and a water-based ink are put in the slits or nozzles, and a voltage is applied between the opposed electrodes so that the high voltage is applied. By applying an electrostatic force based on the difference in the dielectric constant between the dielectric material and the water-based ink, the high-dielectric material is moved in the nozzle opening direction to cause the ink to spring out from the slits or the nozzle opening ends, and the object that is close to the slits or nozzles It is characterized by printing on a printing body.

Alternatively, the high dielectric material may be formed of an aggregate of fine powders of an organic or orientation material having a high dielectric constant and have a specific gravity larger than that of an aqueous ink, or the high dielectric material may be an organic or inorganic material having a high dielectric constant. It may be formed by gathering filaments of material, or may have a structure in which six surfaces are free and are formed of a solid of an organic or inorganic material having a high dielectric constant and have a higher specific gravity than water-based ink, or a high dielectric is used as a lower surface. May be formed of one organic or inorganic elastic body having a high dielectric constant fixed to the bottom surface of the nozzle, or the high dielectric may be formed of a liquid having a high dielectric constant whose specific gravity is larger than that of the ink. The ink having a high dielectric constant may have a configuration in which an organic or inorganic material having a high dielectric constant is dispersed in the ink.

[0012]

The present invention consists of two physical phenomena.
One of them is a capillary phenomenon. The pen has long been the favorite recording method used by humankind, but this is a very simple method: ink is applied to the tip of the pen and it is run on the paper in the desired shape. At this time, the ink penetrates into the paper by the capillary phenomenon. This fact can be immediately confirmed by pointing the pen up and writing something on the paper held on it. The line width is narrower than when facing down, but you can certainly write. This result shows that when recording with ink on paper, it is sufficient to carry the ink until it comes into contact with the paper. After that, the ink automatically penetrates into the paper due to the capillary phenomenon. If the capillary is thin, this force is strong enough to overcome the gravity acting on the ink and lift the ink upward. At that time, it spreads in the lateral direction, which causes bleeding, which is not preferable, but fortunately, all papers existing in the world are processed so that the ink does not easily permeate and spread except for Japanese paper. This paper is usually called plain paper. That is, the ink recording method of the present invention can be used for plain paper.

Another principle is electrostatic force. In the present invention, when two objects having different permittivities are arranged and an electric field is applied to them at right angles, the electrostatic force acting on the surface of the object having the higher permittivity in proportion to the difference between the two permittivities is used. .

According to the present invention, a strong force applied to a high dielectric substance moves it toward the opening end of the nozzle or slit, thereby pushing up only the ink and not ejecting the ink droplet.
Moreover, with the tip of the nozzle fixed, recording is performed on the paper by the capillary phenomenon.

The present invention is roughly divided into three different systems. The first method is a method in which the water-based ink itself is made to have a high dielectric constant and the ink is raised to the nozzle opening by an electrostatic force based on the difference in dielectric constant from air. This force is insufficient to cause the ink to fly, but is sufficient to rise in the nozzle and cause the ink to spring out from the nozzle.

The second method is a method in which a high dielectric is placed in the lower part of the nozzle, ink is put in the upper part, and the high dielectric is moved (deformed) by electrostatic force to push up the ink.
Movable high dielectric materials include liquids, powders, filaments, and 6
There are surface-free solids, rubber, etc.

The third method is a method in which a high dielectric fine powder is dispersed in the ink and moved by an electrostatic force acting on the fine powder to simultaneously lift the ink. In this case, in principle, the same force should act above and below the high-dielectric-constant fine powder, and it should not move, but it is possible to obtain an upward force by means such as using nonuniform dielectric fine powder. it can.

When fine powder is used in the second method,
The state after it is soothed is almost the same as the third.
In these cases, the fine powder may adhere to the paper together with the ink.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of a main part of a printer using the electrostatic contact ink recording method of the present invention. Plain paper is conveyed as a printing medium 13 between the ink spilling multi-head 11 and the opposing backup roller (driving roller) 12. The arrow mark in the figure indicates the traveling direction of the printing medium 13. The fixing and drying device, the XY driving device for the paper, the XY driving device for the recording head, etc. are not provided, and the structure is very simple. Therefore, low cost and quietness are achieved.

FIG. 2 is a diagram for explaining the structure and operation of one of the multi-head ink springs shown in FIG. 1 taken out. In the figure (a), 21, 22
Are electrodes facing each other attached to the structure, covered with a thin insulating layer (not shown), and forming nozzles or slits (hereinafter simply referred to as “nozzles”) 23 opening upward. Aqueous ink 2 is used as a liquid with a high dielectric constant in the nozzle.
It is filled to the extent that 4 is not filled. In the multi-head 11 of FIG. 1, such nozzles 23 are arranged so as to fill the width of the paper, for example, 2048 nozzles are arranged at right angles to the traveling direction of the plain paper as the printing medium 13.

One of the electrodes 21 and 22 facing each other is a common electrode, and the common electrodes of all the nozzles are electrically connected and always grounded. The other electrode 21 is a signal electrode, which is independent for each nozzle, and the switch is closed and voltage is applied only when printing. However, not all nozzles may be driven simultaneously, but may be driven separately. The tip of the nozzle 23 and the paper 13 may be in contact with each other, but if they are slightly separated, the tailing phenomenon is less likely to occur. To slightly separate the nozzles, for example, air can be blown from both sides of the nozzle 23 to float with the air pressure. These signal application methods and paper floating methods are known in various fields.

When one of the nozzles 23 becomes one pixel and a print (ON) image signal comes to the signal electrode 21 (that is, when the switch of the signal electrode 21 is turned on), a predetermined voltage is applied between the electrodes 21 and 22. Is applied (Fig. 2 (b)).
As a result, an electric field is formed between the signal electrode 21 and the common electrode 22, and the surface of the water-based ink 24 is expressed by the following equation (1) fn = (1/2) (ε1-ε2) E ² (1) The force fn exerted acts on the ink 24 in the nozzle 23. Since this force continues to work while the tip of the ink is between the electrodes, the ink rises while being accelerated and spouts from the opening end of the nozzle.

However, as the ink rises, the weight of the raised portion increases and acts in the opposite direction, so that the ink stops at a certain height. As will be described in detail later, the distance between the free surface of ink and the paper must be less than or equal to this height.

Ink 24 spouted from the tip of the nozzle 23
a is in contact with the object to be printed 13, and the object to be printed 1 has a capillary phenomenon.
It penetrates into 3 (Fig. 2 (b)). When the voltage is cut off and the electric field disappears, the electrostatic force that acts on the ink disappears, and the ink 24 that has not penetrated into the paper as the printing medium 13 drops in the nozzle under its own weight (FIG. 2 (c)). The movement of the printing object 3 causes the nozzle 23 to print the next pixel (FIG. 2 (d)).

In this system, the relative permittivity of the ink 24 cannot be 80 or higher than that of pure water, so that the electrostatic force is limited by this relative permittivity. So the second method is
A material having a high relative permittivity is arranged at the bottom of the nozzle, and a large electrostatic force is applied to the material to move or deform the high dielectric material to push up the ink and similarly cause the ink to spring out.

FIG. 3 shows an example of such a configuration. This is the same as the embodiment of FIG. 1 except that the powdery high dielectric 25 is deposited on the bottom of the nozzle 23 as shown in FIG. As the high dielectric 25, for example, powder of polyaniline, polypyrrole, polyoctylthiophene, etc. having a diameter of several microns is suitable.

When a voltage is applied between the signal electrode 21 and the common electrode 22, (1) is applied to the surface of the powder layer of the high dielectric material 25.
The strong electrostatic force based on the formula acts, and the powder of the high dielectric material 25 rises while pushing up the ink. However, this force is only at the beginning, and when it soars in the ink, the same electrostatic force acts on the top and bottom, so it does not rise any further and falls due to the gravity due to the difference in specific gravity with the ink.

However, since this force always acts on the new surface of the powder layer of the high-dielectric 25, the powder has the structure shown in FIG.
As shown in (b), the ink 24 soars one after another, causing the ink 24 to spring out from the nozzle 23. When the voltage becomes 0, all the high dielectric powder 25 returns to the bottom surface, and as a result, the ink also drops in the nozzle by its own weight (FIG. 3 (c)). Printed material 1
The printing of the pixel is completed by the movement of 3 (FIG. 3 (d)). At this time, even if some of the powder is transferred to the paper together with the ink 24, since the particles are very small and the color is close to black, there is no problem.

In this method, it is possible to obtain a strong electrostatic force by using a material having a high dielectric constant, but there is a drawback in that it is only initial and does not work continuously. Therefore, an improved embodiment is shown in FIG.

In the embodiment of FIG. 4, the powder of the high dielectric material 25 is fused and integrated. This high-dielectric 25 is made by filling the nozzle with the high-dielectric-constant powder, lightly sintering it, and melting parts of the surfaces of each other. Alternatively, the high dielectric powder may be dissolved in a solvent, filled in the nozzle, and then dried by heating. The high dielectric 25 produced in this way is in a state in which none of the six surfaces is fixed in the nozzle 23, that is, 6
It is inserted into the nozzle with all surfaces free. However, in this embodiment, the length of the electrode is not the entire nozzle as shown in the drawing, but is a part of the middle of the nozzle (FIG. 4).
(a)).

Although not shown, all electrodes 22 are grounded as in FIG. 3, and the electrodes of the electrodes 21 are closed by applying a voltage only when printing.

When a voltage is applied to the signal electrode 21, an upward electrostatic force acts on the surface of the high dielectric material 2
5 rises while lifting the ink 24, and causes the ink 24a to spring out from the tip of the nozzle. During this time, as long as the upper surface of the high-dielectric 25 is between the electrodes 21 and 22, the electrostatic force directed upward continuously continues to act (FIG. 4 (b)).

The upper surface of the high dielectric 25 is the electrodes 21, 22.
When it comes off above the gap and the lower surface enters between the electrodes, the electrostatic force stops acting on the upper surface, and conversely, the downward electrostatic force acts on the lower surface. As a result, the dielectric stops rising and begins falling. At that time, if the voltage is turned off, the unit will fall by its own weight (Fig. 4 (c)). Then, if the printing medium 13 and the nozzle 23 move relatively, the printing is completed (FIG. 4 (d)).
By arranging two pairs of electrodes facing each other and applying a voltage to the upper side when rising and to the lower side when lowering, it is possible to drop the electrodes faster than they naturally fall.

If a rubber having a fixed bottom surface and a high dielectric constant is used instead of such a rigid body having six surfaces, the return can be accelerated by the elastic force of the rubber.

If a filament is used instead of the cubic rubber, a large movement can be performed with a small force. Further, in this case, unlike the powder described above, there is an advantage that the downward electrostatic force does not always act even when the yarn is lifted. If a liquid having a high dielectric constant is used instead of the solid, smoother movement can be expected.

According to the second method described above, the first
It has been improved so that a larger electrostatic force can be used than the method of. However, this method is a two-component system of ink and high dielectric material, whereas the first system is a one-component system of ink only, and is somewhat disadvantageous in terms of durability and maintenance.

Therefore, a third method combining the advantages of both will be described with reference to FIG. The device, the image forming process, and the like are exactly the same as those in the first method. However, the powder is stably dispersed in the ink as a high dielectric substance in the ink (Fig. 5 (a)
).

When a voltage is applied, an electrostatic force acts on the high-dielectric-constant powder at the same time vertically (although actually, an electrostatic force in the left-right direction also occurs). If the high-dielectric material is spherical and has a uniform dielectric constant, the electrostatic forces above and below cancel each other out, and if it is indeterminate and there is a distribution of dielectric constant, it moves to either side. If the amount of powder moving upward statistically is greater than the amount of powder moving downward, the powder group as a whole rises with the ink, and the ink 24a springs out from the nozzle tip (FIG. 5 (b )
).

When the voltage is turned off, the ink in which the high-dielectric powder is dispersed falls in the nozzle by its own weight (FIG. 5 (c)), and the object to be printed 1
3 moves to complete printing (Fig. 5 (d)).

Next, the above qualitative explanation will be quantitatively supplemented. First, the case of the first method will be described with reference to FIG. The inner diameter of the nozzle is d × d, for example, 50 μm × 50 μm.
Let h be the height at which the ink is lifted from the free surface. The density of the ink is ρ1, and is assumed to be 1.0 × 10 ³ Kg / m ³ . The permittivity of air is ε0, the permittivity of ink is ε1, and the relative permittivity is 1.0 and 80.0, respectively.

When the applied voltage is 50 V, the voltage E between the electrodes is
Is calculated by equation (2). E = V / d = 50 / (50 × 10 ⁻⁶ ) = 10 ⁶ [V / m] …… (2) Substituting ε0, ε1, E into Eq. (1), ink is formed at the boundary between ink and air. An electrostatic force Fe acting upward is required.

Fe = (1/2) (ε1-ε2) E ² = (1/2) × 8.85 × 10 ^-12 (80-1) × (10 ⁶ ) ² = 3.5 × 10 ² [N / m ² ] Since this value is per unit area (1 m ² ), this nozzle (5
(0 μm × 50 μm), the value is Fe '. Fe' = Fe × S = 3.5 × 10 ² × (50 × 10 ^-6 ) ² = 8.75 × 10 ^-7 [N] ...... (1 ')

The height raised from the free surface of the ink is h
Assuming [m], the gravity Fg applied to the ink is (3)
It is calculated by the formula. Fg = ρ1 × g × h × d × d (3) = 1.0 × 10 ³ × 9.8 × h × 50 × 10 ^-6 × 50 × 10 ^-6 ≈ 2.5 × 10 ^-5 × h [N]

The rising height h of the ink when Fe '= Fe is the maximum value h.max. From (1 ') and (3), h.max can be calculated as follows. h.max = (8.75 × 10 ^-7 ) / (2.5 × 10 ^-5 ) = 3.5 × 10 ^-2 [m]

That is, it can be seen that the maximum height can be increased by 35 mm under this temporary condition. Not only the gravity, but also the frictional force between the ink and the wall surface of the nozzle, the surface tension of the ink, etc. must be taken into consideration, but if the distance between the free surface of the ink and the paper as the printing medium 3 is set to 10 to 20 mm, It is clear that the tip of the ink gushes from the nozzle according to the law of inertia.

Next, a quantitative consideration of the second method will be given with reference to FIG. As described above, there are opposing electrodes 21 and 22 in the middle of the nozzle 23, and in the nozzle there is the ink 24 and the single high-dielectric 25 sunk therein. The length of the ink 24 on the electrodes 21 and 22 and the dielectric 25 is h1 (= 1 mm), and the densities of the ink 24 and the dielectric 25 are ρ1 (= 1.0 × 10 ³ Kg / m ³ ), ρ2 (= 1.5 × 10 ³ Kg / m ³ ) Dielectric constants of ink 24 and dielectric 25 are ε1 (= 80 × 8.85 × 10 ⁻¹² F / m) and ε2 (= 1000 × 8.85 × 10), respectively.
^-12 F / m) The width and depth of the nozzle 23 is d (= 0.050 mm), and the applied voltage is E
(= 50V)

At the interface between the ink and the dielectric, the electrostatic force Fe based on the equation (1) acts upward. This force causes dielectric 2
That is, the 5 itself and the ink 24 on it start to move upward.

However, since gravity acts downward on both of them, that amount must be subtracted. If the gravity acting on the ink and the dielectric is Fg1 and Fg2, the total force Ft can be expressed by the following equation (4) (ignoring the frictional force with the wall surface of the nozzle). Ft = Fe- (Fg1 + Fg2) ...... (4)

Fe is obtained by the following calculation from the equation (1) as in the previous case (calculated as a force acting on the nozzle area S = d × d). Fe = (1/2) (ε1-ε2) E ² S = (1/2) x 8.85 x 10 ^-12 x (1000 -80) x (10 ⁶ ) ² x (50 x 10 ^-6 ) ² = 1.02 x 10 ^-5 [N] (Note, unit area the 1 m ² per becomes ^{4.08 × 10 3 [N / m} 2].)

Fg1 and Fg2 are obtained by the following equation (3). Fg1 = ρ1 × g × h1 × d × d = 1.0 × 10 ³ × 9.8 × 1.0 × 10 ^-3 × 50 × 10 ^-6 × 50 × 10 ^-6 = 2.45 × 10 ^-8 [N] Fg2 = ρ2 × g × h2 × d × d = 1.5 × 10 ³ × 9.8 × 1.0 × 10 ⁻³ × 50 × 10 ⁻⁶ × 50 × 10 ⁻⁶ = 3.67 × 10 ⁻⁸ [N]

Compared to Fe, Fg1 and Fg2 are very small, and are 6/1000 even when combined. Therefore, for simplicity, the electrostatic force Fe is set to 1.0 × 10 ^-5 [N] and gravity is ignored. Mass of ink and dielectric m1, m2 that this electrostatic force acts on
Are respectively calculated as follows. m1 = ρ1 × h1 × d × d = 1.0 × 10 ³ × 1.0 × 10 ^-3 × 50 × 10 ^-6 × 50 × 10 ^-6 = 2.5 × 10 ^-9 [Kg] m2 = ρ2 × h2 × d × d = 1.5 × 10 ³ × 1.0 × 10 ^-3 × 50 × 10 ^-6 × 50 × 10 ^-6 ＝ 3.75 × 10 ^-9 [Kg] The total mass mt of the ink 24 and the dielectric 25 is mt = m1 + m2 = 6.25 It was determined to be × 10 ^-9 [Kg].

Since the acting force and the mass that receives the force are obtained, the acceleration α is calculated by the equation of motion shown by the equation (5). α = Fe / mt = (1.0 × 10 ^-5 ) / (6.25 × 10 ^-9 ) = 1.6 × 10 ³ [m / s ² ]

The time required for the tip of the dielectric to pass through the electrode of length h1 (1.0 mm) at this acceleration is calculated by the following equation (6). t = √ (2h1 / α) (6) = 1.12 × 10 ^-3 [sec] If the length from the end of the electrode to the tip of the nozzle is the same (1.0mm), the ink will spring out after the voltage is applied. The time to do is 1.12 msec. This value is by no means a fast recording method, but it is easy to make it shorter because the strokes assumed are long. Everything here
Assume 1 mm.

Since the elapsed time and the acceleration are known, the initial velocity V0 when the ink flows out from the nozzle tip is
It is calculated by equation (7). V0 = αt (7) = (1.6 × 10 ³ ) × 1.12 × 10 ^-3 = 1.79 [m / sec] This value is about 1 when compared to the initial velocity of the inkjet.
Although it is / 5, it is large enough to cause the ink to spring out from the nozzle and contact and permeate the printing medium 13.

Next, the time required for returning is roughly calculated.
Mass moving at initial velocity V0 = 1.70 m / sec mt = 6.25
× 10 ^-9 Kg of dielectric + electrostatic force in the opposite direction to ink -Fe =-
Suppose that 1.02 × 10 ⁻⁵ N is added. This time, instead of pushing up the ink above the dielectric, the ink below the dielectric is pushed down, but for the sake of simplicity, the symmetrical ink masses are the same. Since the absolute value of the force and the mass are the same, the return acceleration has the same absolute value as the previous one, but the direction is opposite. Therefore, the time t1 until the velocity v becomes 0
Is calculated by the following equation (8) (Note, the ink on the dielectric is
In this arrangement, there is no need to consider because it is all pushed out of the nozzle). v = -αt1 + v0 = 0 ∵t1 = v0 / α = 1.79 / (1.69 × 10 ^-3 ) ... (8) = 1.12 [m / s ² ]

That is, it is the same as the time required for the dielectric to pass through the electrode while being accelerated. Acceleration is performed downward from here, and as a result, the time required for the lower end of the dielectric to pass through the electrode is the same. After that, it falls naturally due to its own weight. Since the specific gravity of the dielectric is 1.5,
The buoyancy applied in water is 0.5 × Fg2. This size does not occur from the beginning, so for simplicity we will assume that half of it is always added. That is, mass
An object of m2 (= 3.75 × 10 ^-9 Kg) is 0 at an initial velocity of 1.70 m / sec.
It is replaced with the problem of finding the time t3 for moving the distance h2 = 1.0 × 10 ⁻³ m while receiving the force of 75 × Fg2. This is basically the same problem as before, so only the results are shown. t3 = 5.87 × 10 ^-4 [sec]

That is, it is 0.6 msec. Summing up all the above time, it will be less than 4 msec. Although it takes a lot of time, as mentioned earlier, if a stroke of 1 mm is not taken, one pixel (dot, one line of multi-nozzle) can be completed in a shorter time.

Next, the third method is shown in FIG. As shown in this figure, the electrostatic force acting on the upper and lower sides of the high-dielectric powder dispersed in the ink is different, and if the upward force is larger than the downward force, the difference causes the powder to rise and the ink also rises accordingly. It is a translation. However, theoretically, regardless of the shape of the high-dielectric substance in water, as long as the projected areas on the horizontal plane are the same, the electrostatic forces acting vertically are the same and cancel each other out. Therefore, not only the shape but also the distribution (non-uniformity) of the dielectric constant and density in the high-dielectric powder and the non-uniformity (bending, concentration) of the electric field are formed and springed out.

[0059]

As described above, according to the present invention,
The following special effects are achieved. (1) Since it is not necessary to eject ink droplets, it requires less energy than the inkjet method. (2) Since the image is recorded directly on the printing medium such as paper, the positional deviation due to the flight does not occur and the image is clear. (3) Since plain paper can be used as the printing object, the running cost is low. (4) Since the head has a simple structure and can be easily elongated, the manufacturing cost can be reduced. (5) The response speed is faster than the heating / cooling method. (6) Since the ink is retracted into the nozzle during non-printing, tailing does not occur.

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire ink seepage type multi-head according to the present invention.

2 (a) to 2 (d) are views showing the configuration and operation of the first embodiment of the present invention.

3 (a) to 3 (d) are diagrams showing the configuration and operation of the second embodiment of the present invention.

4 (a) to 4 (d) are diagrams showing the configuration and operation of an embodiment in which a high dielectric material is integrated in the second embodiment of the present invention.

5 (a) to 5 (d) are diagrams showing the configuration and operation of the third embodiment of the present invention.

FIG. 6 is a diagram for quantitatively explaining the first embodiment.

7 (a) to (d) are diagrams for quantitatively explaining the embodiment of FIG.

FIG. 8 is a diagram for quantitatively explaining the third embodiment.

FIG. 9 is a diagram showing a configuration of a conventional thermal rheography head.

10 (a) to 10 (c) are views for explaining the printing operation of the thermal rheography of FIG.

[Explanation of symbols]

 13 Printed Material (Paper) 21, 22 Electrode 23 Nozzle 24 Ink 25 High Dielectric Material

Claims (9)

[Claims] 1. A surface of the ink is formed by forming slits or nozzles that open upward between opposing electrodes, inserting the slits or nozzles to the extent not filled with aqueous ink, and applying a voltage between the opposing electrodes. An electrostatic force based on the difference in the dielectric constant between the ink and the air layer is applied to the ink to move the ink and cause it to spring out from the opening ends of the slits and nozzles, and to print on a printing medium close to the slits and nozzles. The recording method by using electrostatic ink discharge. 2. A slit or nozzle having an upward opening is formed between opposed electrodes, a high dielectric material and a water-based ink are placed in the slit or nozzle, and a voltage is applied between the opposed electrodes to increase the height. By applying an electrostatic force based on the difference in the dielectric constant between the dielectric material and the water-based ink, the high-dielectric material is moved in the nozzle opening direction to cause the ink to spring out from the slits or the nozzle opening ends, and the object that is close to the slits or nozzles A recording method using electrostatic ink discharge, which is characterized by printing on a printing body. 3. The recording method according to claim 2, wherein the high dielectric material is formed of an aggregate of fine powders of organic or orientation material having a high dielectric constant and has a larger specific gravity than the water-based ink. . 4. The recording method according to claim 2, wherein the high-dielectric body is formed by a group of filaments made of an organic or inorganic material having a high dielectric constant. 5. The electrostatic capacitor according to claim 2, wherein the high dielectric material is formed of a solid of one organic or inorganic material having a high dielectric constant and having six surfaces free, and has a higher specific gravity than the water-based ink. Recording method by ink outflow. 6. The electrostatic capacitor according to claim 2, wherein the high dielectric substance is formed of one high dielectric constant organic or inorganic elastic substance whose bottom surface is fixed to the bottom surface of the nozzle. Recording method by ink outflow. 7. The recording method according to claim 2, wherein the high dielectric material is formed of a liquid having a high dielectric constant larger than that of ink. 8. The recording method according to claim 1, wherein the ink having a high dielectric constant is an ink in which an organic or inorganic material having a high dielectric constant is dispersed. 9. An electrode facing each other, a nozzle formed between them and opening upward, an aqueous ink contained in the nozzle, a specific gravity and a relative dielectric constant greater than that of the aqueous ink contained in the nozzle. A recording device using electrostatic ink discharge, which is characterized by comprising a high-dielectric material having a high rate.