JP2000233498A - Ink jet recording method and ink jet recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the change of ink viscosity and thereby prevent image quality deterioration from occurring by splitting plural ultrasonic wave generation means into plural sets of ultrasonic wave generation means groups and switching a combination of burst waves to be applied to the means groups to at least a pattern for flying ink droplets or a pattern for not flying the ink droplets. SOLUTION: In the ink jet recording device consisting of piezoelectric elements, each being composed of a common electrode 19 and plural individual electrodes 20 opposed to each other and a piezoelectric material 11 sandwiched between the former two, which are arranged at a specified interval in a array shape in an ink retaining chamber 13 to which ink droplets 14 are supplied from an ink tank, a few pieces of piezoelectric element formed of the individual electrodes 20 are grouped as one set and a burst wave with a varying phase is applied to each of the piezoelectric elements of one set to form a one-dot image. In this case, a combination of burst waves is switched to a pattern for fly ink droplets or a pattern for not fly the ink droplets. Thus the ink is stirred by giving rise to the vibration of the ink to prevent the ink viscosity from being changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic wave generating means for radiating ultrasonic waves into an ink liquid, focusing the ultrasonic waves in the vicinity of the ink liquid surface, and causing ink droplets to fly by the pressure of the ultrasonic waves. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording method and an ink jet recording apparatus for recording an image by depositing ink droplets on a recording medium, and in particular, ejecting ink droplets by the pressure of an ultrasonic beam radiated by a piezoelectric element toward a recording medium. The present invention relates to a flying ink jet recording method and an ink jet recording apparatus.

[0002]

2. Description of the Related Art Conventionally, there has been known an ink jet recording apparatus (printer) that forms recording dots by flying an ink liquid onto a recording medium. This ink jet recording apparatus has the advantages that it has less noise than other recording methods and does not require processing such as development and fixing, and is attracting attention as a plain paper recording technique.

To date, a number of ink-jet recording apparatuses have been devised. In particular, as a method of causing ink droplets to fly by the pressure of steam generated by the heat of a heating element, for example, Japanese Patent Publication No. 56-9429. Gazette and Tokugyo Sho 6
The technique disclosed in Japanese Patent Application Laid-Open No. 1-59911 and the technique disclosed in Japanese Patent Publication No. 53-12138, for example, is a typical example of a method in which an ink droplet is caused to fly by a pressure pulse due to displacement of a piezoelectric body. It is.

However, these methods have a problem that local concentration of ink tends to occur due to evaporation or volatilization of a solvent, and individual nozzles corresponding to respective resolutions are likely to be finely clogged. In particular, in the method using the pressure of the vapor, adhesion of insoluble matter due to thermal or scientific reaction with the ink liquid, etc., and in the method using the pressure due to the displacement of the piezoelectric material, complicated The structure makes it easier to induce clogging.

In a serial scan type recording head using tens to hundreds of tens of nozzles, the frequency of clogging can be reduced, but a line scanning type recording head which requires thousands of nozzles is used. In the head, clogging occurs at a high probability with a high probability, which is a major problem in terms of reliability. Furthermore, these systems have the disadvantage that they are not suitable for increasing the resolution.

In order to overcome these drawbacks, a method using an ultrasonic wave (I) in which ink droplets fly from an ink liquid surface using the pressure of an ultrasonic beam generated from a thin film piezoelectric material (I).
BMTDB, vol. 16, No. 4, pp. 1168
(1973-10), USP-4308547 (198
1), JP-A-63-166548, JP-A-63-166548
JP-A-313157, JP-A-2-184443,
Japanese Patent Application Laid-Open No. 63-162253) has been proposed. Since this method is a nozzleless method that does not require a nozzle for each individual dot or a partition wall for the ink flow path, it is effective for preventing and recovering from clogging, which was a major obstacle in making a line head. Has a structure. Further, since an ink droplet having a very small diameter can be stably ejected, it is suitable for high resolution.

[0007]

However, in the above-described conventional ink jet recording system, ink droplets are ejected from wide slits and fly, so that the area where the ink liquid comes into contact with air through the slits is large. A volatile solvent such as alcohol contained in the ink liquid may evaporate, and the viscosity of the ink near the ink liquid surface may change. When the ink viscosity changes, the attenuation rate of the sound wave changes, and even if the same energy is applied, the ink droplets do not fly, or the flying direction is shifted, resulting in a problem that the image quality is deteriorated.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an ink jet recording method and an ink jet recording apparatus capable of preventing a change in ink viscosity and performing high quality and highly reliable recording without deteriorating the image quality. I do.

[0009]

According to an ink jet recording method of the present invention, a plurality of ultrasonic wave generating means are set as one set for a plurality of ultrasonic wave generating means, and at least two ultrasonic wave generating means are provided in this set of ultrasonic wave generating means. By selectively applying a burst wave composed of a combination of burst waves according to the recorded image,
Radiating ultrasonic waves into the ink liquid from the ultrasonic wave generating means,
An inkjet recording method for recording an image by focusing an ultrasonic wave in the vicinity of an ink liquid surface, causing an ink droplet to fly by the pressure of the ultrasonic wave, and attaching the ink droplet to a recording medium. The combination of the burst waves applied to the sound wave generator is switched, as necessary, to at least a pattern in which ink droplets fly and a pattern in which ink drops do not fly.

In the ink jet recording method according to the present invention, at the time of recording an image, the burst wave is switched to a combination of at least two types of burst waves having different phases from each other. Is switched to a burst wave obtained by combining at least two burst waves.

Further, in the ink jet recording method of the present invention, a plurality of ultrasonic wave generating means are set as one set with respect to a plurality of ultrasonic wave generating means, and the set of ultrasonic wave generating means is provided with at least two types having different phases. By selectively applying a burst wave obtained by combining the burst waves according to the recorded image, the ultrasonic wave is emitted from the ultrasonic wave generating means into the ink liquid, and the ultrasonic wave is focused near the ink liquid surface. An ink jet recording method for recording an image by causing ink droplets to fly by the pressure of ultrasonic waves and attaching the ink droplets to a recording medium, wherein the plurality of ultrasonic generating means A burst wave obtained by combining at least two burst waves having the same phase with each other.

Further, the ink jet recording apparatus of the present invention emits an ultrasonic wave into the ink liquid, focuses the ultrasonic wave near the ink liquid surface, causes the ink droplet to fly by the pressure of the ultrasonic wave, and What is claimed is: 1. An ink jet recording apparatus for recording an image by attaching it on a recording medium, comprising: a plurality of ultrasonic generators for emitting the ultrasonic waves; and a plurality of ultrasonic generators for the plurality of ultrasonic generators. 1
A driving means for selectively applying a burst wave obtained by combining at least two burst waves to the set of ultrasonic wave generating means in accordance with a recorded image; and a burst for applying the burst wave to the plurality of ultrasonic wave generating means. Switching means for switching the combination of waves to a pattern for causing at least ink droplets to fly and a pattern for not causing ink droplets to fly are provided as necessary.

In the ink jet recording apparatus of the present invention, the switching means switches to a burst wave obtained by combining at least two types of burst waves having different phases at the time of recording an image, and at the time of a pause where no image is recorded. Switching to a burst wave obtained by combining at least two burst waves having the same phase with each other.

The ink jet recording apparatus of the present invention emits ultrasonic waves into the ink liquid, focuses the ultrasonic waves near the ink liquid surface, causes the ink droplets to fly by the pressure of the ultrasonic waves, and causes the ink droplets to fly. What is claimed is: 1. An ink jet recording apparatus for recording an image by attaching it on a recording medium, comprising: a plurality of ultrasonic generators for emitting the ultrasonic waves; and a plurality of ultrasonic generators for the plurality of ultrasonic generators. 1
Driving means for selectively applying a burst wave obtained by combining at least two types of burst waves having different phases to this set of ultrasonic wave generating means in accordance with a recorded image, and a pause time during which no image is recorded Time measuring means for measuring the time, when the time measuring means measures a predetermined time set in advance, a burst wave obtained by combining at least two burst waves in phase with each other to the plurality of ultrasonic wave generating means A non-flying burst wave applying means for applying a predetermined time for a predetermined time.

Further, the ink jet recording apparatus of the present invention emits an ultrasonic wave into the ink liquid, focuses the ultrasonic wave near the ink liquid surface, causes the ink droplet to fly by the pressure of the ultrasonic wave, and An ink jet recording apparatus that records an image by being attached to a recording medium, comprising a plate-shaped piezoelectric body, a plurality of individual electrodes arranged at regular intervals on one surface of the piezoelectric body, and a plurality of individual electrodes. A single common electrode disposed on the other surface of the piezoelectric body facing the electrode, a piezoelectric element for generating the ultrasonic wave, and a plurality of individual electrodes of the piezoelectric element, A drive unit for selectively applying a burst wave obtained by combining at least two types of burst waves having different phases to one set of the individual electrodes according to a recorded image;
A non-flying burst wave applying means for applying a burst wave, which is a combination of at least two burst waves having the same phase to each of the plurality of individual electrodes, during a pause in which no image is recorded.

According to the present invention, without changing the conditions of the burst wave applied to the piezoelectric body as the ultrasonic wave generating means,
By simply changing the combination pattern of the burst waves, it is possible to realize the vibration of the ink liquid surface and the flying of the ink droplets. The vibration of the ink liquid surface can be used as a means for agitating the ink liquid, thereby preventing a change in ink viscosity on the ink liquid surface. Therefore, highly reliable recording can be performed without deteriorating the image quality.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram schematically showing the configuration of an ink jet recording apparatus according to the present invention. The inkjet recording apparatus of the present invention is connected to, for example, a personal computer, and transmits information for printing and graphic recording, and starts recording. When a recording start signal is received, a start signal is transmitted from the control unit 1, the paper feed roller 2 is operated, and the paper 3 as a recording medium is transmitted to the transport drum 4. During recording, the transport drum 4 rotates in the direction of the arrow A in the drawing, receives the paper 3 sent by the paper feed roller 2, and transports the paper 3 toward the recording head 5. When the sheet 3 reaches above the recording head 5, the control unit 1 sends a recording start signal to a drive IC of the recording head 5 or the like, and the image recording operation starts.

When the trailing edge of the paper 3 approaches above the recording head 5, a recording end signal is sent from the control unit 1, and the recording operation ends. After the recording is completed, the transport drum 4 rotates in the direction of arrow B in the drawing, and transports the paper 3 to the discharge roller 6. Next, the paper 3 on which the image is recorded is discharged to the paper discharge tray 8 with the aid of the discharge auxiliary member 7. When the sheet 3 is discharged, a series of recording operations is completed, and a standby state for the next recording operation is set.

In the standby state, the counter 9 as the time measuring means starts counting the pause time during which recording is not performed. The counter 9 is connected to a backup battery (not shown), and can count down time even when the power of the apparatus is turned off. The counter 9 is connected to the control unit 1, and the control unit 1
Based on the count value of the counter 9, driving of a piezoelectric element described later is controlled.

FIGS. 2 and 3 schematically show the structure of the recording head 5. FIG. That is, a plate-shaped piezoelectric body 11 as an ultrasonic vibrator sandwiched between opposed electrodes 19 and 20 which will be described later is provided on a support member 10, and a lens 12 as a means for focusing sound waves thereon is provided thereon. A pool-like ink holding chamber 13 is formed around the piezoelectric body 11 and the lens 12, and the inside thereof is filled with an ink liquid 14.

On the upper part of the ink holding chamber 13, a piezoelectric body 11 is provided.
Further, a slit member 16 provided with a long slit 15 in the longitudinal direction of the lens 12 is formed. Here, the height of the wall surface of the pool-like ink holding chamber 13 is
As a result, the height of the slit 15 of the slit member 16 formed thereon becomes the focus position of the sound wave, and the ink liquid surface can be held at the focus position. ing.

The ink liquid 14 is supplied from an ink tank (not shown) to a plurality of supply ports (not shown) provided in the ink holding chamber 13 via a pump and an ink supply tube. Piezoelectric body 11 and electrodes 19, 2 opposed to each other
The piezoelectric elements composed of zeros are arranged at regular intervals in an array, and by driving a plurality of the piezoelectric elements at the same time, the ultrasonic waves are focused near the ink liquid surface to form ink droplets. Is to fly.

Further, in this embodiment, the piezoelectric body 11 is not divided into an array, but the lower electrodes 20 of the piezoelectric body 11 are divided and arranged in an array to form individual electrodes. And
An array of extraction electrodes 21 at the same interval as shown in FIG.
Each of the individual electrodes 20 is press-bonded with an adhesive. The extraction electrode 21 is connected to a terminal of a driving IC (integrated circuit) 22 for driving the piezoelectric body 11 and a bonding wire 2.
3 are connected.

The upper electrode 19 of the piezoelectric body 11 is connected to a common terminal (not shown) of the drive IC 22 as a common electrode. The drive IC 22 is connected to the control unit 1 that controls the drive via a printed wiring board (not shown) and a connector.

The lens 12 has irregularities based on the Fresnel zone theory formed parallel to the longitudinal direction of the piezoelectric body 11 (hereinafter referred to as the main scanning direction). The thickness of the concave and convex portions of the lens 12 is (2n +
1) It is set to be close to ４ times (n is an integer of 0 or more), and the lens material has a value close to the square root of the product of the acoustic impedance of the piezoelectric body 11 and that of the ink liquid, for example, alumina powder Is used, the bottom surface on which the lens is provided has a structure also having a function as an acoustic matching layer.

A description will be given of a droplet flying operation using the recording head 9 configured as described above, focusing on the vicinity of the slit member 16 which is a droplet flying point. In addition, a driving method of the recording head 9 will be described.

FIG. 5 shows a burst-like signal having a desired width input from the driving IC 22 to the piezoelectric body 11. The frequency of the burst wave is set to a frequency near the resonance frequency determined by the thickness of the piezoelectric body 11 and the like. In the present embodiment, the fundamental frequency of the burst wave is a sine wave of 50 MHz. In the present embodiment, the sound wave is focused by the Fresnel lens 12 in the width direction (sub-scanning direction) of the recording head 9, but the phase is 180 degrees in the longitudinal direction (main scanning direction) of the recording head 9. Staggered burst wave 2
Sound waves are focused by combining the types (hereinafter referred to as 0 phase / π phase).

The piezoelectric body 11 vibrates due to the burst wave, and the sound wave is excited toward the lens 12 and the ink liquid 14. Since one cycle of the sound wave is excited in one cycle of the burst wave, the burst width is the wave number of the excited sound wave. In the present embodiment, the burst width is set to 10 μs so that the wave number of the sound wave becomes “2000”.

With a set of several piezoelectric elements formed by the individual electrodes 20, burst waves having different phases are applied to each set of piezoelectric elements to form an image of one dot. In the present embodiment, for example, as shown in FIG. 6, eight piezoelectric elements are set as one set, and burst waves of 0 phase and π phase are set to “0”.
π0000π0 ”in order, and the sound wave in the main scanning direction is
One dot is formed by focusing around the center of each piezoelectric element.

Therefore, in order to print one line in the main scanning direction (the width direction of A4 size paper), the drive element is scanned eight times in the main scanning direction to form. For this reason, the dots that fly at the same time are dots that are eight dots adjacent in the main scanning direction. The focus of the sound wave in the sub-scanning direction is focused at the center of the slit 15 of the slit member 16 using the Fresnel lens 12.

FIG. 7 is a sectional view of the vicinity of the slit member 16 in the sub-scanning direction, and is an explanatory diagram for explaining a temporal change of the ink liquid level. In a non-recording state where no burst wave is applied to the piezoelectric body 11 and no sound wave is excited in the ink liquid 14, as shown in FIG.
Has a concave liquid surface on the surface of the slit 15.

Next, the burst wave shown in FIG.
When applied to 1, sound waves are excited in the ink liquid 14,
Propagating toward the ink surface, reflected from the ink surface,
The light propagates toward the lens 12 and the piezoelectric body 11. As shown in FIG. 3B, when the sound wave is reflected on the ink liquid surface, the ink liquid surface is raised by the pressure of the sound wave (hereinafter, this is referred to as an ink meniscus P1). When the sound wave reflected on the ink liquid surface reaches the piezoelectric body 11, the sound wave is reflected by the piezoelectric body 11 and propagates again in the ink liquid surface direction.

As this series of operations is repeated, the ink meniscus P1 continues to grow gradually by the pressure of the sound wave on the ink surface, as shown in FIG. Thus, the droplet P2 is caused to fly. Here, when the next signal is not applied, the sound wave is attenuated due to the viscosity of the ink 14 and the like, and gradually disappears. Finally, the liquid level returns to a concave shape as shown in FIG.

By the way, the ink jet recording apparatus according to the present invention does not require a fine orifice and uses a wide slit as the slit 15, so that it has a strong structure against clogging and dust. However, because of the wide slits, the area where the ink liquid comes into contact with air is large, and volatile solvents such as alcohol contained in the ink liquid evaporate, which may change the ink viscosity near the ink liquid surface. .

FIG. 8 shows the change of the ink viscosity over time. FIG. 8 shows filling a beaker with an ink liquid,
This is the result of measuring the viscosity while leaving it in an atmosphere.
It can be seen that the viscosity increases with time. The recording head 5 of the present inkjet recording apparatus has a width of 300 μm.
Since only 15 slits are left in the air,
Although the viscosity of the entire ink liquid does not change rapidly as in FIG. 8, it is considered that the viscosity change similar to that in FIG. 8 occurs on the ink liquid surface in contact with air.

When the viscosity of the ink changes, the attenuation rate of the sound wave changes, and even if the same energy is applied, the ink droplet does not fly, or the flying direction of the ink droplet shifts.
Image quality may be degraded.

To solve this problem, there is a method of changing the width and peak value of the burst wave applied to the piezoelectric element according to the viscosity of the ink liquid surface to change the power of the sound wave. However, it is not practical because it has a problem that it becomes complicated and expensive.

In order to prevent a change in the viscosity of the ink liquid surface, the ink liquid may be agitated, and the ink liquid surface may be vibrated.

As described above, the ink jet recording apparatus according to the present invention focuses a sound wave at a desired position by combining the phases of the burst waves input to the lens and the piezoelectric element, and performs the liquid focusing by the pressure of the focused sound wave. An image is formed by flying droplets.

The combination pattern of the 0-phase and the π-phase must be changed according to the focal length. In other patterns, the sound wave does not converge, so that the ink droplet does not fly. Conversely, if the combination pattern is changed to another pattern, it is possible to stop only the vibration of the ink liquid level without causing the ink droplet to fly.

That is, the vibration of the ink liquid surface and the flying of the ink droplet can be realized only by changing the combination pattern without changing the condition of the burst wave applied to the piezoelectric element. The vibration of the ink liquid surface can be used as a means for agitating the ink liquid, thereby preventing a change in ink viscosity on the ink liquid surface.

FIG. 9 shows the pressure distribution of sound waves on the ink liquid surface (converging position) when driven by the combination pattern of burst waves used in the embodiment according to the present invention. FIG. 7 shows a case where the ink is applied to eight elements required to fly one dot ink droplet. The broken line is a pattern that causes the ink droplet to fly, and as described above, “0π0”
When “000π0” is applied, the solid line is a pattern that vibrates the ink liquid level, and in this example, “00000000”.
This is the case of applying a pattern “0”, that is, burst waves having the same phase. The burst width and the peak value are both the same.

When a burst wave having the same phase is applied,
The sound waves do not converge and the pressure at the center is slightly higher, but the pressure is such that the ink droplets do not fly. The pattern in which ink droplets are shown by broken lines in FIG. 9 has a very high pressure at the center and a high pressure compared to the case of the same phase.
Ink droplets can be made to fly.

In the embodiment according to the present invention, at the time of a pause in which no image is recorded, burst waves having the same phase are all applied to vibrate the ink liquid surface. However, it is sufficient that the sound wave does not converge on the ink liquid surface, and the pattern of the burst wave is not limited to this.

As described above, by applying a burst wave having a pattern that does not converge a sound wave to the piezoelectric element, the sound wave can be radiated into the ink liquid without causing the ink droplet to fly. And a change in ink viscosity can be prevented.

Even if the vibration of the ink liquid level is always generated during the pause when the image is not recorded, the change in the ink viscosity can be prevented, but the signal is always applied to the piezoelectric element. , Power consumption increases. Therefore,
By providing the above-described counter 9, a pause time during which no image is recorded is measured, and when a desired time is measured, vibration of the ink liquid surface is caused to occur for a predetermined time. Less than,
This will be described in detail with reference to the flowchart shown in FIG.

The counter 9 starts counting when the apparatus enters a recording standby or power-off state, and stops counting when the apparatus enters a recording state. When the count value of the counter 9 reaches a predetermined value set in advance, the control unit 1 switches the drive data of the piezoelectric element to a non-flying burst wave pattern (all burst waves having the same phase) in which ink droplets do not fly,
A non-flying burst wave is applied to the piezoelectric element for a predetermined period of time.

When the set time has elapsed, the control unit 1 stops applying the non-flying burst wave and enters a standby state. At this time, the control unit 1 clears the value of the counter 9. After being cleared, the counter 9 starts the counting operation again and repeats the above operation.

FIG. 11 shows the results of measurement of missing dots when an image is recorded on A4 size recording paper with and without the above-described control. In FIG. 11, the horizontal axis represents the pause time (elapsed time), the white circles indicate that the control was not performed, the white triangles indicate the case where the set value of the counter 9 was set to 60 minutes, and the white squares indicate the set values of the counter 9. This is the case where the value is set to 30 minutes. The application time of the burst wave pattern in which the ink droplet does not fly was set to 30 seconds.

As shown in FIG. 11, when the above control is not performed, the dot drop increases with time because the viscosity at the ink liquid level changes. After 210 minutes,
Almost no ink drops were flying. When the set value of the counter 9 was set to 60 minutes, almost no missing dots were observed, but after 30 minutes, some missing dots were observed. When the set value of the counter 9 was 30 minutes, no missing dots were observed.

[0052]

As described above in detail, according to the present invention, it is possible to prevent a change in ink viscosity and to prevent image quality from deteriorating.
It is possible to provide an ink jet recording method and an ink jet recording apparatus capable of performing high-quality and highly reliable recording.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram schematically showing a configuration of an ink jet recording apparatus according to the present invention.

FIG. 2 is a perspective view schematically showing a recording head in a partially disassembled configuration.

FIG. 3 is a vertical sectional side view schematically showing a configuration of a recording head.

FIG. 4 is a diagram illustrating individual electrodes of a piezoelectric element.

FIG. 5 is a diagram illustrating a burst wave applied to a piezoelectric element.

FIG. 6 is a diagram illustrating signals applied to a piezoelectric element.

FIG. 7 is a sectional view in the sub-scanning direction illustrating a temporal change of an ink liquid near a slit member in the recording head.

FIG. 8 is a graph showing a change over time in ink viscosity.

FIG. 9 is a graph showing a pressure distribution of a sound wave.

FIG. 10 is a flowchart for explaining the operation of the main part.

FIG. 11 is a graph showing a result when recording is performed by the ink jet recording apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Control part 2 ... Paper feed roller 3 ... Paper (recording medium) 4 ... Convey drum 5 ... Recording head 6 ... Discharge roller 7 ... Discharge auxiliary member 8 ... Discharge tray 9 ... Counter DESCRIPTION OF SYMBOLS 10 ... Base material 11 ... Piezoelectric body (ultrasonic vibrator) 12 ... Fresnel lens 13 ... Ink chamber 14 ... Ink liquid 15 ... Slit 16 ... Slit member 19 ... Common electrode 20 ... Individual electrode 21: Leader electrode 22: Drive IC (drive means) 23: Bonding wire P1: Ink meniscus P2: Droplet (ink drop)

Claims (7)

[Claims] 1. A plurality of ultrasonic wave generating means are paired with a plurality of ultrasonic wave generating means, and a burst wave obtained by combining at least two burst waves with the set of ultrasonic wave generating means is recorded. By selectively applying according to the above, the ultrasonic wave is emitted from the ultrasonic wave generating means into the ink liquid, the ultrasonic wave is focused near the ink liquid surface, and the ink droplet is caused to fly by the pressure of the ultrasonic wave, An ink jet recording method for recording an image by depositing the ink droplets on a recording medium, wherein a combination of the burst waves applied to the plurality of ultrasonic wave generating means is used to fly at least the ink droplets as necessary. An ink jet recording method characterized by switching between a pattern to be made and a pattern not to make ink droplets fly. 2. A recording method for recording an image, comprising: switching to a burst wave obtained by combining at least two types of burst waves having different phases from each other;
2. The method according to claim 1, wherein the switching is performed to a burst wave obtained by combining at least two burst waves having the same phase.
3. The inkjet recording method according to item 1. 3. A plurality of ultrasonic wave generating means are paired with a plurality of ultrasonic wave generating means and at least two types of burst waves having different phases are combined with each other. By selectively applying a burst wave according to a recording image, the ultrasonic wave is emitted from the ultrasonic wave generating means into the ink liquid, the ultrasonic wave is focused near the ink liquid surface, and the ink is pressed by the pressure of the ultrasonic wave. An ink jet recording method for recording an image by flying droplets and depositing the ink droplets on a recording medium, wherein the plurality of ultrasonic generating means have at least the same phase with respect to the plurality of ultrasonic wave generating means at the time of rest without recording an image. An ink jet recording method comprising applying a burst wave obtained by combining two burst waves. 4. An ultrasonic wave is radiated into the ink liquid, the ultrasonic wave is focused near the ink liquid surface, the ink droplet is caused to fly by the pressure of the ultrasonic wave, and the ink droplet is attached to a recording medium. An inkjet recording apparatus for recording an image, comprising: a plurality of ultrasonic wave generating means for emitting the ultrasonic wave; and a plurality of ultrasonic wave generating means for the plurality of ultrasonic wave generating means. A driving means for selectively applying a burst wave obtained by combining at least two burst waves to the ultrasonic wave generating means according to a recorded image; and a combination of the burst waves to be applied to the plurality of ultrasonic wave generating means. An ink jet recording apparatus comprising, as necessary, at least switching means for switching between a pattern for causing ink droplets to fly and a pattern for causing ink droplets not to fly. 5. The recording apparatus according to claim 1, wherein said switching means switches to a burst wave obtained by combining at least two types of burst waves having different phases during recording for recording an image, and at least two burst waves having the same phase when not recording an image. The ink jet recording apparatus according to claim 4, wherein the burst wave is switched to a burst wave obtained by combining two burst waves. 6. An ultrasonic wave is radiated into the ink liquid, the ultrasonic wave is focused near the ink liquid surface, the ink droplet is caused to fly by the pressure of the ultrasonic wave, and the ink droplet is attached to a recording medium. An inkjet recording apparatus for recording an image, comprising: a plurality of ultrasonic wave generating means for emitting the ultrasonic wave; and a plurality of ultrasonic wave generating means for the plurality of ultrasonic wave generating means. Driving means for selectively applying a burst wave, which is a combination of at least two types of burst waves having different phases to each other to the ultrasonic wave generating means, according to a recorded image, and time measuring means for measuring a pause time during which no image is recorded When the time measuring means measures a predetermined time set in advance, a bar formed by combining at least two burst waves having the same phase with respect to the plurality of ultrasonic wave generating means. An ink jet recording apparatus for the non-flying burst wave applying means for a predetermined time applied previously are set strike wave, characterized by comprising a. 7. An ultrasonic wave is radiated into the ink liquid, the ultrasonic wave is focused near the ink liquid surface, the ink droplet is caused to fly by the pressure of the ultrasonic wave, and the ink droplet is attached to a recording medium. An ink jet recording apparatus for recording an image, comprising: a plate-shaped piezoelectric body; a plurality of individual electrodes arranged at regular intervals on one surface of the piezoelectric body; and a piezoelectric body facing the plurality of individual electrodes. A single common electrode disposed on the other surface, the piezoelectric element generating the ultrasonic wave, and a plurality of individual electrodes corresponding to the plurality of individual electrodes of the piezoelectric element. Driving means for selectively applying a burst wave obtained by combining at least two types of burst waves having different phases to one set of individual electrodes according to a recorded image; Against each other A non-flying burst wave applying means for applying a burst wave obtained by combining at least two burst waves having the same phase with each other.