JPH06155736A - Method and device for static deformation ink recoring - Google Patents

Abstract

PURPOSE:To provide the direct ink recording method and a device thereof without generating tailings. CONSTITUTION:A laminate consisting of a signal electrode 13, a high inductivity elastic body 14 and a common electrode 15 is installed in an ink chamber 11, and an ink passage 16 running through all the above components is formed. Voltage is applied between both electrodes 13 and 15, and the high inductivity elastic body 14 is shrinked by static attraction force generated by the voltage and separated off a paper as shown in the drawing 4(a). When the voltage is set as zero (0), the high inductivity elastic body is stretched and the end of the ink outlow passage 16 is brought into contact with or close to the paper to feed ink 17 to the paper and print on the same (drawing 4(b)). When printing is completed, voltage is applied between both electrodes and the paper is separated off the ink outflow passage 16, and ink 18a is absorbed into the paper. Then the movement for the following pinting is started and no tailings are generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for directly printing on paper like a pen, and printing by bringing the tip of an ink outflow path (electrostatic multi-pen) formed in a high dielectric constant elastic body close to or in contact with the paper. The present invention relates to an ink recording device that compresses a high dielectric constant elastic material to separate the paper from the ink outflow path and stop printing.

[0002]

2. Description of the Related Art Many reports have been made in various documents and patent publications regarding an ink jet system for printing by ejecting ink from a nozzle. As a typical example,
There is a piezo system, which prints by causing ink droplets to fly by the vibration of a bimorph type piezo element.

The bubble jet method is also well known. This causes bubbles to be generated in the ink liquid by the heater, and ink droplets are ejected by the growth of the bubbles.

Further, in JP-A-60-97860, an ink jet recording apparatus for ejecting ink by applying a voltage to electrodes sandwiching liquid ink in a pressure chamber and reducing the volume of the pressure chamber by an electrostatic force acting between the electrodes. Is proposed.

In such an ink jet system,
In order to express the gradation (that is, to change the size of the dot), in the type using the above-mentioned piezo element or the type disclosed in Japanese Patent Laid-Open No. 60-97860, the pressure is changed depending on the applied voltage and the ink is changed. The amount of ink is changed to change the size of the ink droplet, that is, the size of the dot, to express gradation.

However, if the ink droplets are made smaller, the ejection pressure also becomes smaller, and minute ink droplets cannot fly. In the bubble jet method, since the size of the bubble is determined by the nozzle structure regardless of the applied voltage, the dot size cannot be changed (one dot multi-value cannot be obtained), and
Only 1 record is possible.

A common problem of the ink jet system is that a large amount of energy is required to fly the ink.

Therefore, an attempt was made to print by directly contacting the paper with the nozzle without causing the ink droplets to fly. However, if you feed the head or paper before the ink dries, the ink on the paper is dragged by the head and becomes a trail,
The image deteriorates.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve this problem, and an object thereof is to provide a direct ink recording method that does not cause tailing and an apparatus therefor.

[0010]

In order to achieve the above object, the method of the present invention comprises a high dielectric constant elastic body sandwiched between a signal electrode and a common electrode, and an ink outflow path penetrating between both electrodes. When the ink is formed and communicated with the ink chamber, and the tip of the ink outflow path is brought into contact with or brought close to the paper, ink is supplied to the paper for printing, and electrostatic attraction generated by applying a voltage between the electrodes causes A feature is that the high dielectric constant elastic body is deformed, and the deformation causes the ink outflow path to be separated from the paper to move for the next printing.

In addition, the voltage applied between the electrodes is changed to change the distance from the paper to change the outflow amount of the ink, or the high dielectric constant elastic body closes the ink outflow path. Can also be elastically deformable, and the opening ratio of the ink outflow passage can be freely changed from the closed state to the fully opened state.

In the apparatus of the present invention, an ink chamber having a space for accommodating the ink therein and a signal electrode and a common electrode are sandwiched in a laminated state, and one of the electrodes holds the ink chamber on the wall of the ink chamber. It is characterized by a dielectric constant elastic body and an ink outflow passage formed by penetrating from the wall of the ink chamber to the electrode outside the high dielectric constant elastic body.

Further, it is desirable that the high dielectric constant elastic body is elastically deformable in the direction of closing the ink outflow passage, or that a plurality of ink outflow passages are formed in one ink chamber.

[0014]

Function: A voltage is usually applied between the signal electrodes sandwiching the high dielectric constant elastic body and the high dielectric constant elastic body, and the high dielectric constant elastic body causes the ink to be generated by electrostatic attraction between the electrodes. Since it is contracted in the chamber direction and the ink outflow path is away from the paper surface, no printing is performed.

When printing, when the voltage between both electrodes is set to 0 v, the compressed high dielectric constant elastic body returns to its natural state (length), and the ink outflow path comes into contact with or approaches the paper surface. Ink is supplied from the ink chamber to the paper surface and penetrates into the paper by the capillary phenomenon to print.

When printing is completed, a voltage is applied again between both electrodes, and the high dielectric constant elastic body contracts. If the ink head or the paper is moved in this state, the trailing does not occur.

By increasing or decreasing the voltage applied between both electrodes, the distance between the ink outflow path and the paper surface can be changed, and the ink supply amount can be changed, so that gradation can be expressed.

Further, when the high dielectric constant elastic body is contracted, it is also elastically deformed in the direction of closing the ink outflow passage, so that the ink outlet can be closed when the ink supply is stopped. As a result, tailing can be reliably prevented, and ink evaporation can also be prevented.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a bird's eye view of a direct ink recording apparatus of the present invention. Ink is directly supplied from a multi-stylus (pen) 1 as an ink recording device to the plain paper 2 according to an image signal, and the ink is sucked into the paper by a capillary phenomenon to form an image. A backup roller 3 supports the paper 2.

FIG. 2 is a sectional view of one head used in the above-mentioned multi-stylus 1 as a direct ink recording apparatus in the first embodiment of the present invention. Also, FIG.
(a) to (c) are perspective views illustrating the forming process with the head facing upward. Although specific numbers are included in these figures, they are for the purpose of deepening understanding and are not limited thereto.

First, the structure of the ink recording apparatus of the present invention will be described together with its manufacturing method. 2 and 3, reference numeral 11 denotes an ink chamber, which is made of plastic such as polyethylene. As shown in Fig. 3 (a), the bottom surface is 127 μm
Orifices 12 having a diameter of 50 μm are formed in a zigzag pattern at intervals of, and a signal electrode 13 made of aluminum foil is formed by means of photoetching or the like so as to surround the holes of each orifice 12. The signal electrode 13 is formed even on the side surface of the ink chamber 11.

The orifice 12 may be formed by a mechanical method or a high energy laser beam after the signal electrode 13 is formed. Also, in this example,
Although a plurality of orifices 12 are formed in one ink chamber 11, ink chambers may be independently formed for each orifice.

Next, this portion is put into an acidic solution of aniline and electropolymerized, and as shown in FIG. 3B, a thickness of polyaniline 15 having the same shape as the upper surface of the signal electrode 13 is formed.
A thick film of 0 μm, that is, the high dielectric constant elastic body 14 is formed.

Finally, as shown in FIG. 3C, the common electrode 15 is coated with a conductive rubber in a direction orthogonal to the signal electrode 13 to complete the process. At this time, in the high dielectric constant elastic body 14, only one of the six surrounding surfaces is fixed to the ink chamber 11, and the other five surfaces are free to move. Further, the orifice 12 is combined with a hole penetrating from the wall 11a of the ink chamber 11 to the signal electrode 13, the high dielectric constant elastic body 14 and the common electrode 15 to form an ink outflow passage 16.

Silicone rubber is suitable for the conductive rubber forming the common electrode 15 because it is required to have water repellency. The thickness may be thin, but 10 to 20 μm is suitable so that the elastic body can be expanded and contracted according to the contraction and recovery thereof and no problem occurs even if it is scraped by contact with paper.

FIGS. 4 (a) to 4 (d) are model views showing the operation of the ink recording apparatus shown in FIGS. The signal electrode 1 is formed on the bottom surface of the ink chamber 11 so as to surround the ink outflow passage 16.
3, the high dielectric constant elastic body 14 and the common electrode 15 are laminated as shown in the figure.

Normally, a voltage is applied to the signal electrode 13, and as shown in FIG. 4 (a), the high dielectric constant elastic body 14 is electrostatically attracted between the electrodes 13 and 15 to form a rigid ink chamber 11. Since it contracts in the direction of and the tip of the ink outflow passage 16 is not in contact with the paper 2, printing is not performed.

Next, when the voltage of the signal electrode 13 corresponding to the pixel to be printed is set to 0 v, the compressed high 2 electric constant elastic body returns to its natural length, and as a result, as shown in FIG. 4 (b). As described above, the common electrode 15 comes into contact with the paper, the ink 17 drops by its own weight, and the ink penetrates into the paper 2 due to the capillary phenomenon to perform printing.

When a voltage is applied to the signal electrode 13 again, the high dielectric constant elastic body 14 contracts and the contact between the ink 16 and the paper is cut as shown in FIG. 4 (c). In this state, the line moves to the next line as shown in FIG. 4 (d) (actually, the paper 2 moves), but the ink 17a printed on the paper 2 has a border with the ink in the ink outflow passage 16. Therefore, printing is completed without trailing. Of course, when the next pixel is also printed continuously, there is no problem even if it moves while it is in contact. That is, this method is an automated method of recording with a pen, which has been performed by humans since ancient times.

FIGS. 5 (a) to 5 (d) show the principle of one-dot multivalue, that is, gradation recording. By a simple principle, the distance between the tip of the ink outflow passage 16 and the paper is changed according to the image density. This interval is determined by the contraction amount of the high dielectric constant elastic body 14, and the contraction amount changes depending on the applied voltage, so that it can be easily and accurately controlled.

FIG. 5 (a) shows the same state as FIG. 4 (a) in which no voltage is applied and a voltage of 26v is applied. Figure 5
In the state (b), a voltage of 21.5v is applied between the electrodes 13 and 15, and a small amount of the ink 17 spreads over the paper to form small dots. FIG. 5 (c) shows the case where 15v is applied,
Form medium dots. In FIG. 5D, the maximum amount of ink is printed and the dot becomes the largest when 0v is reached. ID of FIG. 5 shows image density (Image Density).

Although not shown, rigid bodies, such as Teflon (registered trademark), are provided on both sides of the high dielectric constant elastic body 14 and the common electrode 15 for keeping the distance between the paper and the bottom surface of the ink chamber 11 constant. A spacer / slider made of resin is provided.

As the high dielectric constant elastic body 14, not only the above-mentioned polyaniline but also polyacetylene, polypyrrole or the like can be used. In addition, the relative permittivity is as high as 300,000, but in the present invention, it is 30,0
00 is enough. The Young's modulus is preferably small (soft), and the rubber hardness is preferably about 20 °.

Then, an elastic body having a thickness of 150 μm is 30%, 45%
The voltage required for contracting μm is about several tens of v, which will be shown later by calculation. Therefore, it is possible to print by applying a general IC circuit without requiring a special electric circuit (printing board), which is very advantageous in terms of cost.

Next, a quantitative explanation is supplemented to the above qualitative explanation. However, since the exact calculation becomes very complicated, it is an approximate calculation based on some assumptions.

An electrostatic attractive force P acting on the high dielectric constant elastic body 14 when a voltage of + 72v is applied to the signal electrode 13 is obtained.
P is P =-[sigma] * E (1), where-[sigma] is the charge density of electrons charged in the common electrode 13 (conductive rubber) and E is the electric field at that point.

This electric field is formed by the holes (charge density is σ) charged in the signal electrode 13. According to Gauss's theorem, this electric field is E = σ / 2εoε1 (2) (where, εo is the dielectric constant of vacuum ε1 is the relative dielectric constant of the elastic body). Therefore,
Substituting (2) into (1) gives P = -σ ² / 2εoε 1 (3).

Therefore, if the electron charge density −σ is obtained, the electrostatic attractive force P can be calculated from the equation (3). The signal electrode 13, the high dielectric constant elastic body 14 and the common electrode 15 form a parallel plate capacitor. Therefore, the charged charge amount Q is obtained by the following equation. Q = C × V (4) where C is the electric capacity and V is the applied voltage.

The charge density is obtained by dividing the charge amount Q by the area S. σ = Q / S (5) The electric capacitance C of the equation (4) is calculated by the following equation (6), where d1 and ε1 are the film thickness and the relative permittivity of the high dielectric constant elastic body 14, respectively. C = εoε1S / d1 (6)

D1 and ε1 are 150 μm, 1500,
If the area S is 1 m ² , C = 8.85 × 10 ^-12 × 30000 × 1 / (150 × 10 ^-6 ) = 17.7 × 10 ^-4 (F) (7) (4), (5), (7) From the formula, the charge density σ is calculated as σ = 17.7 × 10 ⁻⁴ × 72 = 1274.4 × 10 ⁻⁴ (C / m ² ) (8).

By substituting this value into the equation (3), the electrostatic attractive force P acting on the high dielectric constant elastic body 14 can be obtained. ^{P = σ 2/2 εo ε1} (9) = (1274.4 × 10 -4) 2 /2×8.85×10 -12 × 30000 = 3.06 × 10 4 (N / m 2)

Next, compression (deformation) of the high dielectric constant elastic body 14 is performed.
Calculate the quantity v. Generally, in the case of an elastic body, when the force acts on the length Lo before the force acts and the length contracts to L,
Force and contraction are directly proportional. At this time, a force equal to the force pulling the elastic body from the outside is generated inside the elastic body. This is called stress σ. A value obtained by dividing the extended length ΔL = L−Lo by the original length Lo is called strain ε, and a proportional constant of stress and strain is called elastic coefficient (elastic modulus, Young's modulus) E. σ = E × ε (10)

That is, the original length Lo and the applied pressure P
If (= σ) and the elastic modulus E are known, the contracted length ΔL can be calculated from the following equation. ΔL = Lo × σ / E (11)

Assuming that the elastic modulus E of polyaniline is equal to that of the softest rubber, E = 1.0 × 10 ⁵ N / m
² (= 0.1 MPa = 1 Kgf / cm ² ), in the case of the present invention, the original length Lo is 150 × 10 ⁻⁶ m and the electrostatic attractive force (= stress σ) as described above.
Is 3.06 × 10 ⁴ N / m ² . Put this value into Eq. (11) and obtain ΔL = (150 × 10 ^-6 × 3.06 × 10 ⁴ ) /1.0×10 ⁵ = 45.9 × 10 ^-6 (m) (12) Was calculated. That is, in FIG. 4 (a), (c), (d),
When 72 v is applied, the high dielectric constant elastic body 14 contracts by 45 μm so that the orifice 12 does not contact the paper.

Similarly, when printing an intermediate density, 42
The compression distance is calculated for v and 59v. First, for 42v,

From the equations (4), (5) and (7), the charge density σ is calculated as σ = 17.7 × 10 ⁻⁴ × 42 = 743.4 × 10 ⁻⁴ (C / m ² ) (8).

By substituting this value into the equation (3), the common electrode 1
The electrostatic attraction P acting on 5 (conductive rubber) is required. ^{P = σ 2 / 2εoε1 (9} ) = (743.4 × 10 -4) 2/2 × 8.85 × 10 -12 × 30000 = 1.04 × 10 4 (N / m 2)

This value is also put into the equation (11), and ΔL = (150 × 10 ^-6 × 1.04 × 10 ⁴ ) /1.0×10 ⁵ = 15.6 × 10 ^-6 (m) (12) High dielectric constant elastic body when + 42v is applied to the electrode 1
The compression distance of 4 was determined to be 15.6 μm.

Next, in the case of 59v, the charge density σ from equations (4), (5) and (7) is σ = 17.7 × 10 ⁻⁴ × 59 = 1044.3 × 10 ^{− It} is calculated as ⁴ (C / m ² ) (8).

By substituting this value into the equation (3), the common electrode 1
The electrostatic attraction P acting on 5 (conductive rubber) is required. ^{P = σ 2 / 2εoε1 (9} ) = (1044.3 × 10 -4) 2/2 × 8.85 × 10 -12 × 30000 = 2.05 × 10 4 (N / m 2)

This value is also put into the equation (11), and ΔL = (150 × 10 ^-6 × 2.05 × 10 ⁴ ) /1.0×10 ⁵ = 30.7 × 10 ^-6 (m) (12) The compression distance of the high dielectric constant elastic body when +59 V was applied to the electrode was determined to be 31 μm.

6 to 9 are views showing another embodiment of the present invention. The basic structure of this embodiment is shown in FIGS.
The second embodiment is similar to the first embodiment described above, but the high dielectric constant elastic body can be elastically deformed not only in the vertical direction of the drawing but also in the direction of closing the ink outflow passage. Is a feature.

FIG. 6 corresponds to FIG. 2 of the first embodiment, in which the lead wire 13a of the signal electrode 13 is connected to the ink chamber 11.
The difference is that the common electrode 15 is arranged inside the wall 11a and the size of the common electrode 15 is slightly smaller. Further, the high dielectric constant elastic body 18 is the high dielectric constant elastic body 1 of FIG.
Different from No. 4, it elastically deforms not only in the vertical direction but also in the horizontal direction in the figure.

FIGS. 7A to 7D are views showing the steps of forming the head with the head of FIG. 6 facing upward. A method of manufacturing the head of this embodiment will be described with reference to FIGS. The ink chamber 11 is made of plastic such as polyethylene as in the first embodiment. In the ink chamber 11, as shown in FIG. 7 (a), the signal electrode 1
3 is formed in the same manner as in the first embodiment. However,
Only the upper surface of the ink chamber, not the side surface. The signal electrode 13 is connected to the lead wire 13a, and the lead wire 13a is connected to a signal voltage application circuit (not shown). This structure and manufacturing method are the same as in the case of a general print substrate.

Next, when the bottom of the ink chamber 11 provided with the signal electrode 13 is immersed in an electrolytic solution in which a pyrrole monomer is dissolved in dichloromethane to carry out electrolytic polymerization, FIG.
A thick film of polypyrrole having a thickness of 150 μm is formed in the same shape as the electrode. The thick film of polypyrrole thus formed is the high dielectric constant elastic body 18.

Next, the ink chamber 11 to which the high dielectric constant elastic body 18 is added is put into a vat in which the solution of the conductive rubber is thinly drawn horizontally with the high dielectric constant elastic body 18 facing downward, and the solvent is almost removed. When gently peeled off in a dry state, a conductive rubber film is formed on the high dielectric constant elastic body 18 as shown in FIG. 7 (c). This conductive rubber becomes the common electrode 15.

Next, as shown in FIG. 7 (d), an ink outflow passage 16 having a pitch of 127 μm and a diameter of 50 μm is formed so as to penetrate from the common electrode 15 to the ink chamber 11. The ink outflow passage 16 is preferably wide above and below the high dielectric constant elastic body 18 and narrow in the middle, rather than having the same diameter from top to bottom. Therefore, the manufacturing method becomes simple, and either mechanical means or thermal method using a powerful laser may be used.

Similar to the first embodiment, the high dielectric constant elastic body 1
In addition to polypyrrole described above, polyacetylene, polyaniline, or the like can be used as 8. In addition, the conductive rubber to be the common electrode 15 is also preferably silicone rubber from the viewpoint of water repellency, and the thickness is also preferably 10 to 20 μm.

8 (a) to 8 (d) are the same as FIG. 4 of the first embodiment.
It corresponds to (a) to (d).
The operation of the embodiment will be described. Normally, a voltage is applied to the signal electrode 13, and as shown in FIG. 8A, the high dielectric constant elastic body 18 is moved toward the rigid ink chamber 11 by the electrostatic attraction between the electrodes 13 and 15. Since it contracts and expands in the direction perpendicular to it to close the ink outflow passage 16, no printing is performed.

Next, when the voltage of the signal electrode 13 corresponding to the pixel to be printed is set to 0v, the compressed high dielectric constant elastic body returns to its natural length, and as a result, as shown in FIG. 8 (b). The ink outflow passage 16 is opened to the ink flow, and the common electrode 15
Comes into contact with the paper 2 and the ink 17 falls by its own weight and permeates into the paper 2 due to a capillary phenomenon to perform printing.

When a voltage is applied to the signal electrode 13 again, as shown in FIG. 8C, the high dielectric constant elastic body 14 contracts and the ink outflow passage 16 is closed, and at the same time, the ink 17a left below the ink outflow passage 16 is closed. Is attracted to the ink in the paper due to the strong surface tension and transferred to the paper. In this state, by moving to the next line as shown in Fig. 8 (d) (actually, the paper 2 moves),
Printing is completed without the trailing. In this case, unlike the normal pen, since the ink outflow passage 16 is closed in the pixels that are not printed, the evaporation of ink can be almost completely prevented.

FIGS. 9A to 9D correspond to FIG. 5 of the first embodiment and show the principle of gradation recording. In the first embodiment, the distance between the head of the head and the paper, in other words, the distance between the head of the head, that is, the tip of the ink outflow passage 16 and the paper is changed to change the ink supply amount to express the gradation. On the other hand, in the second embodiment, not only the distance between the tip of the ink outflow passage and the paper but also the width of the ink outflow passage 16 is changed. The intervals and widths are determined by the amount of contraction of the high dielectric constant elastic body 14, and the amount of contraction changes depending on the applied voltage.

FIG. 9 (a) shows the same state as FIG. 8 (a) in which no voltage is applied and a voltage of 83v is applied. Figure 9
In (b), when a voltage of 68v is applied between the electrodes 13 and 15, the small-diameter ink outflow passage 16 is opened and a small amount of ink 17 spreads on the paper to form a small dot. Figure 9 (c)
When 48v is applied, the medium diameter ink outflow passage 16 is opened, the tip thereof is closer to the paper, and a medium dot is formed. In FIG. 9D, the maximum amount of ink is printed and the dot becomes the largest when 0v is reached. The ID shown in the figure is the same as that in FIG.

Also in this embodiment, a spacer / slider (not shown) is provided to keep the distance between the paper and the bottom surface of the ink chamber 11 constant, which is the same as the first embodiment.

The qualitative explanation is completed as above, and then a quantitative explanation will be given by using the equations (1) to (12) performed in the first embodiment.

In equation (8), assuming that the voltage applied to the signal electrode 13 is 83v, the charge density σ is calculated as σ = 17.7 × 10 ⁻⁴ × 83 = 1469.1 × 10 ⁻⁴ (C / m ² ). To be

By substituting this value into the equation (3), the electrostatic attractive force P acting on the high dielectric constant elastic body 18 can be obtained. ^{P = σ 2/2 εo ε1} (9) = (1469.1 × 10 -4) 2 /2×8.85×10 -12 × 30000 = 4.06 × 10 4 (N / m 2)

Next, compression (deformation) of the high dielectric constant elastic body 18 is performed.
Calculate the quantity v. The softest elastic modulus E of polypyrrole
Assuming that it is equal to the elastic modulus of rubber, E = 1.0 x 10^FiveN
/ m²(= 0.1MPa = 1Kgf / cm²In the case of the present invention,
The original length Lo is 150 x 10 ^-6m, electrostatic attraction (= stress
σ) is 4.06 × 10^FourN / m² Is. Put this value in equation (11)
ΔL = (150 × 10^-6× 4.06 × 10^Four) /1.0 x 10^Five = 60.9 x 10^-6 (m) and the compression distance of the high dielectric constant elastic body 18 were obtained. Tsuma
8 (a), (c), and (d), the signal electrode 13 is
When 83v is applied, the high dielectric constant elastic body 18 shrinks by 60 μm.
The reason is that the orifice 12 does not touch the paper.
It

In the second embodiment, as shown in FIGS. 8 and 9, the high dielectric constant elastic body 18 contracts in the vertical direction and at the same time expands in the horizontal direction. Therefore, this phenomenon is utilized to separate the paper from the ink outflow passage 16 and to close the ink outflow passage 16.

FIG. 10 is a perspective view of the high dielectric constant elastic body 18, in which the high dielectric constant elastic body 18 has a hollow, thick-walled cylindrical shape. From this figure, the amount of expansion in the horizontal direction is calculated. When the applied voltage is 0v, the high dielectric constant elastic body 18
10, has a cylindrical shape with an inner diameter of 50 μm (2 × r1), an outer diameter of 125 μm (2 × R1), and a height of 150 μm (h1).

When 83v is applied to the signal electrode 13, as shown in FIG.
As shown in 1, the shape of the upper and lower surfaces remains the same and the height is 15
As a result of contraction from 0 μm to 90 μm, the center expands inward and outward, and the ink outflow passage 16 is closed. It is possible to calculate as it is, but here it is a little simpler and
It is assumed that the upper and lower surfaces are also changed as shown by, to form a cylinder having an inner diameter of 2 × r2 and an outer diameter of 2 × R2. With rubber and plastic, the volume hardly changes even when deformed.

The volume before deformation is V1, and that after deformation is V2
Then, it can be calculated by the following equations (13) and (14), respectively. V1 = (πR1 ² −πr1 ² ) × h1 (13) V2 = (πR2 ² −πr2 ² ) × h2 (14)

Assuming that the distances of inward and outward expansion of the cylinder during deformation are equal to x, R2 = R1 + x (15) r2 = r1-x (16) (15), (16) can be converted into the equation (14). Substituting, V2 = {π (R1 + x) ² −π (r1-x) ² } × h2 (17)

Since there is no volume change before and after deformation, V2 = V
It is 1. ^{Therefore, {(R1 + x) 2} - (r1-x) 2} × h2 = (R1 2 -r1 2) × h1 (18) (R1 2 + 2R1x-r1 2 + 2r1x) × h2 = (R1 2 -r1 2) × h1

2 × h2 × (R1 + r1) x = (h1−h2) (R1 ² −r1 ² ) ∴x = (h1−h2) (R1 ² −r1 ² ) / {2h2 (R1 + r1)} (19) ( In equation (19), R1 = 62.5 μm, r1 = 25 μm, h1 = 150
Substituting μm and h2 = 90 μm, x = 60 × 3282.25 / 2 × 90 × 87.5 = 12.5, and the expansion distance in and out during deformation was calculated to be 12.5 μm. This is a distance that just fills half of the inner diameter of the ink outflow passage 16, and it is considered that the ink outflow passage 16 is just blocked in the actual modification shown in FIG.

When printing an intermediate density, the applied voltage may be changed and the same calculation as described above may be performed.

[0077]

As described above, according to the present invention,
Printing can be performed on plain paper with a printing mechanism having a simple structure, and since ink droplets are not ejected, low energy recording is possible.
Further, by increasing / decreasing the applied voltage, it is possible to record with one dot multi-value, and the problem of tailing does not occur. In addition, since it has a simple structure, it is easy to make multiple. Furthermore, by configuring the high dielectric constant elastic body so that it can also be deformed in the direction orthogonal to the ink outflow path, the nozzles can be closed when printing is not performed, and problems such as nozzle clogging due to ink evaporation can be prevented. can do.

[Brief description of drawings]

FIG. 1 is a bird's-eye view illustrating a printing state by a multi-stylus.

FIG. 2 is a view of the first embodiment of the present invention and is a vertical cross-sectional view showing the configuration of an electrostatically deformable ink recording apparatus.

3A to 3C are views showing steps of manufacturing the head of the electrostatically deformable ink recording apparatus of FIG.

4 (a) to 4 (d) are views for explaining the printing operation of the embodiment of FIG.

5 (a) to 5 (d) are diagrams for explaining a state in which one-dot multi-value is printed in the embodiment of FIG.

FIG. 6 is a vertical cross-sectional view showing the configuration of the electrostatically deformable ink recording apparatus according to the second embodiment of the invention.

7A to 7D are views showing steps of manufacturing the head of the electrostatic deformation ink recording apparatus of FIG.

8A to 8D are views for explaining the printing operation of the second embodiment of FIG.

9 (a) to 9 (d) are diagrams illustrating a state in which one-dot multi-value is printed in the second embodiment of FIG.

FIG. 10 is a perspective view of the high dielectric constant elastic body used in the second embodiment of the present invention in which no voltage is applied, and FIG.
Is a sectional view.

11A and 11B are views showing a state where an electrostatic attraction is applied to the high dielectric constant elastic body of FIG. 10 to close the ink outflow path, FIG. 11A is a perspective view, and FIG. 11B is a sectional view.

12 is a diagram in which the state of FIG. 11 is converted into an equivalent cylindrical state, in which (a) is a perspective view and (b) is a sectional view.

[Explanation of reference numerals] 11 ink chamber 13 signal electrodes 14 and 18 high dielectric constant elastic body 15 common electrode 16 ink outflow path 17 ink

Claims (6)

[Claims] 1. A high dielectric constant elastic body is sandwiched between a signal electrode and a common electrode to form an ink outflow path penetrating between both electrodes to communicate with an ink chamber, and the tip of the ink outflow path contacts the paper. The ink is supplied to the paper for printing by bringing them closer to each other, and the high dielectric constant elastic body is deformed by the electrostatic attractive force generated by applying a voltage between the both electrodes, and the deformation causes the ink outflow path from the paper. An electrostatically-deformable ink recording method, characterized in that the recording medium is moved in a separated state for the next printing. 2. The electrostatically deformable ink recording method according to claim 1, wherein the voltage applied between the both electrodes is changed to change the distance from the paper to change the outflow amount of the ink. 3. The high dielectric constant elastic body is elastically deformable in the direction of closing the ink outflow passage, and the opening ratio of the ink outflow passage is freely changed from the closed state to the fully open state. 3. The electrostatic deformation ink recording method according to 1 or 2. 4. A high dielectric constant elastic body which is sandwiched between an ink chamber having a space for accommodating ink therein and a signal electrode and a common electrode, and which is carried on a wall of the ink chamber by one electrode. And an ink outflow passage formed by penetrating from the wall of the ink chamber to the electrode outside the high dielectric constant elastic body. 5. The electrostatically deformable ink recording apparatus according to claim 4, wherein the high dielectric constant elastic body is elastically deformable in a direction of closing the ink outflow passage. 6. The electrostatically deformable ink recording apparatus according to claim 4, wherein a plurality of ink outflow passages are formed in one ink chamber.