JPH02252565A - Supersonic wave generator for ink jet printing head - Google Patents

Abstract

PURPOSE:To prevent irregularity of a driving voltage at each production lot and to obtain stable vibration characteristic for a long period by securing a piezoelectric vibrator to a vibration plate member, and attaching the member to one end of a printing head body. CONSTITUTION:A supersonic exciter 12 and a supersonic wave absorber 13 are provided at both ends of a head body 7. A supersonic wave is generated by the exciter 12, a traveling wave of the wave is propagated into an ink passage 8 to apply a supersonic vibration to ink jets to be injected from nozzles 11, 11,... to generate ink droplets D. The wave propagated in the passage 8 is absorbed by the absorber 13 to eliminate a reflecting wave. The exciter 12 has PZT ceramics 16 as a piezoelectric vibrator, electrodes 17, 17 are formed at both end faces of the ceramics 16. A voltage is applied between the electrodes 17 and 17 to vibrate it in a thicknesswise direction, thereby generating the wave.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ultrasonic generator used in a print head of an inkjet printer.

[Prior Art] Conventionally, as the above-mentioned inkjet printer, there are the following types. That is, as shown in Figure 20,
Ink is introduced into a flow path 101 within the inkjet print head 100, and is ejected in a jet form from a large number of nozzles 102, 102, . At this time, ultrasonic vibration is applied to the inkjet print head 100 by the ultrasonic vibrator 103, and the jet-shaped ink is separated into droplets and caused to fly. The ultrasonic transducer 103 is located on the back side of the flow path 101 of the inkjet print head 100.
It is fixed along the longitudinal direction of the head 100. Further, the ultrasonic transducer 103 may be provided on the back side of the head 100 in some cases.

The ink droplets that are separated into droplets and flying as described above are
After being charged according to the image signal by the m-electrode 104,
An image is printed by being deflected by an electric field created by the deflection electrode 105 and flying onto recording paper (not shown).

However, in this case, an ultrasonic standing wave is formed by the ultrasonic vibrator 103 provided along the longitudinal direction of the print head 100, and this ultrasonic standing wave causes the nozzles 102, 102, .・It separates the jet-shaped ink ejected from the ink into ink droplets. Therefore,
It is difficult to uniformly excite ultrasonic waves in each nozzle 102, 102, etc. due to dimensional errors or non-uniformity of the material of the ultrasonic transducer 103, dimensional errors of mechanical parts, acoustic interference, etc. As shown in FIG. 22, variations occur in the positions where the ink drops are separated.

By the way, the above-mentioned ink drip occurs in band 1! between Wi# which is separated from the jet! Since a predetermined charge is charged by the electrode 104, if there is variation in the position where the ink droplets are separated, the state in which the ink droplets are generated will vary, and the timing at which the ink droplets are charged will be shifted. Furthermore, if the separation state of the drops is different, different amounts of charge will be applied even at the same voltage. Therefore, there is a problem in that the ink droplets are not charged to a predetermined amount of charge, and when deflected by the deflection electrode 105, the ink droplets are not deflected in a predetermined direction, making it impossible to print an appropriate image. Further, there is a problem in that the resonance point of the ultrasonic vibrator 103 and the resonance point of the standing wave in the flow path change depending on the temperature, making it impossible to generate stable ink droplets.

In order to solve the above problems, the following methods have already been proposed.

(1) JP-A-58-197056, JP-A-58-19
No. 7057, JP-A-59-48163, JP-A-59-
As shown in 95153, 61-173947, etc., multiple resonance points of the ultrasonic transducer 103 are set, and the ultrasonic transducer 103 is operated stably in the middle of the resonance points. A resonance point is provided to prevent the effects of harmonics.

(2) Nko Photography Society Journal Vol. 26 No. 1 1987
PPII-17F continuous flow type multi-orifice inkjet drop generator research” and JP-A-62
As shown in the -1o5e3@ publication, the vibration state of the ultrasonic vibrator is analyzed to determine the shape and other conditions that allow good vibration, and the volume of the ink flow path is reduced to reduce the vibration of the ultrasonic vibrator. By transmitting the sound directly to the ink and generating ink droplets, the sound output is concentrated into a small ink flow path.
The separation position of ink droplets is made uniform.

However, the above conventional technology has the following problems. In other words, in the case of (1), the technology is basically related to a single nozzle and cannot be applied directly to multiple nozzles, and it is necessary to cope with fluctuations in the resonance point due to temperature changes to some extent. Even if this is possible, there is still a problem in that it is not possible to prevent variations in vibration due to dimensional errors or non-uniformity of the material of the ultrasonic transducer itself, which is provided along the longitudinal direction of the head.

In the case of (2), knowledge is provided regarding the point of vibrating the ultrasonic vibrator in a piston-like manner, and the vibration of the ultrasonic vibrator is transmitted to a small ink chamber via a solid-state acoustic chamber. However, it is still difficult to vibrate the ultrasonic vibrator uniformly in the longitudinal direction of a long head, and there is a problem that the separation length of the ink droplets cannot be made constant.

As a solution to the above problems, US Patent Box 4.
As shown in Japanese Patent No. 282,532, a method using a piezoelectric film that generates a predetermined vibration by itself without relying on mechanical resonance between the head and the ultrasonic transducer has been proposed, but the size There is a problem in that it is difficult to obtain a uniform vibration state over the longitudinal direction due to errors and non-uniformity of the material.

Therefore, the present inventor, together with other Ministry of Invention and Innovation, has filed the patent application No. 62-131789 to solve the above-mentioned problems.
I proposed something like the one shown in the issue.

As shown in Fig. 23, through holes 110 having a circular cross section are formed in a rectangular material such as stainless steel along the longitudinal direction to form a cylindrical body 111, and one surface of the through hole 110 is formed at regular intervals. A large number of small holes 112, 112... are bored. Then, a nozzle plate 114 having a large number of minute nozzles 113, 113, etc. at the same pitch as the small holes 112, 112, etc. is installed on the surface of this cylinder 111 where the small holes 112, 112, etc. are made. Fixed by adhesive or other means. Also,
An ultrasonic exciter 115 is placed at one end of the through hole 1.10 bored in the cylinder 111, and an ultrasonic absorber 116 is placed at the other end. Then, an ultrasonic exciter 115 applies an ultrasonic traveling wave to the ink inside the n-hole 110, and the inkjet ejected from each nozzle 113, 113, etc. is separated into ink droplets. The ultrasonic waves propagated to the other end of the sixth through hole 110 are all absorbed by the ultrasonic absorber 116.

The ultrasonic exciter 115, as shown in FIG.
19 and 120. This ultrasonic exciter 115 includes a piezoelectric vibrator 118 and a piston 12.
0 through the shim 121 interposed between the cylindrical body 111 and
The piston 1 is mounted in a fluid-tight manner at the end of the
20 is positioned within the n-through hole 110.

Then, by applying a high frequency voltage to the piezoelectric vibrators 117 and 118 through the electrodes 122 interposed between the self-oscillators, ultrasonic vibrations are generated, and the ultrasonic vibrations are transmitted to the through hole 110 via the piston 120. It is designed to propagate to the ink inside.

This Infusiera 1-print head is configured to generate ink droplets by applying a traveling wave of ultrasonic waves to the ink in the N through hole 110 provided inside the cylinder 111 as described above. By making the acoustic shape of the through hole 110 uniform, the traveling wave of the ultrasonic wave can be accurately aligned in period, so that ink droplets can be generated stably and uniformly. .

[Problems to be Solved by the Invention] However, the above-mentioned prior art has the following problems. That is, the ultrasonic exciter 115 includes a piezoelectric vibrator 117, 118, and a pair of screws 119, 118, and 118, respectively.
Since the piezoelectric vibrator 120 is configured with one clamping member, the structure is complicated due to the large number of parts, and the vibration characteristics vary depending on the pressure contact state between the piezoelectric vibrator 117, 118 and the piston 119, 120. Therefore, as shown in FIG. 25, the ultrasonic exciter 115 has a problem in that the drive voltage varies from production lot to production lot, making it impossible to obtain stable vibration characteristics. Furthermore, the vibration characteristics of the ultrasonic exciter 115 change when the pressure contact state between the piezoelectric vibrator 117, 118 and the piston 119, 120 changes during use, so it is possible to obtain stable vibration characteristics over a long period of time. The problem was that it could not be done.

[Means for Solving the Problems 1] Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and its purpose is to generate ink droplets using traveling waves of ultrasonic waves. Provided is an ultrasonic generator for an inkjet printhead that can prevent variations in drive voltage from manufacturing loft to manufacturing loft and that can obtain stable vibration characteristics over a long period of time. It's about doing.

That is, the ultrasonic generator for an inkjet printhead according to the present invention is attached to one end of an inkjet printhead body that has an ink flow path along the longitudinal direction inside, and applies ultrasonic vibration to the ink in the ink flow path. In the ultrasonic generator for an inkjet print head for separating ink ejected from the print head body into ink droplets, the piezoelectric vibrator is fixed to a diaphragm member, and this diaphragm member is attached to the print head body. It is configured to be attached to one end of the

For example, PZT ceramic is used as the piezoelectric vibrator, but the piezoelectric vibrator is not limited thereto, and other piezoelectric vibrators may be used.

Further, the piezoelectric vibrator is formed, for example, in a circular shape, but is not limited to this, and may be formed in a polygonal shape.

Furthermore, although a single piezoelectric sensor is used, for example, a plurality of piezoelectric sensors may be stacked and used. In such a case, a larger amplitude can be obtained than when a single piezoelectric vibrator is used.

This piezoelectric vibrator is fixed to the diaphragm member using, for example, an epoxy adhesive, but it is not limited to this, and it goes without saying that other adhesives may be used.
Further, the method is not necessarily limited to means such as adhesion.

Further, as the diaphragm member, for example, a stainless steel plate is used, but it is not limited to this, and other materials may be used.

Furthermore, the piezoelectric vibrator and the diaphragm member are attached by bonding, for example, with epoxy adhesive, but the method is not limited to this, and bonding with cream solder or welding may also be used, and furthermore, anaerobic An adhesive or the like may also be used.

[Function] In the ultrasonic wave generating device for an inkjet print head according to the present invention, the piezoelectric vibrator is fixed to a diaphragm member, and the diaphragm member is attached to one end of the print head body, so that the ink in the ink flow path is Because the ultrasonic vibration is propagated to the diaphragm, the structure is simple with fewer parts, and the piezoelectric vibrator is fixed to the diaphragm, making it easy to fix the diaphragm and the piezoelectric vibrator. It is possible to make the vibration characteristics uniform, prevent variations between manufacturing lofts, and obtain stable vibration characteristics over a long period of time.

[Example] The present invention will be explained below based on illustrated embodiments.

FIG. 19 shows an inkjet printer to which the ultrasonic generator for an inkjet printhead according to the present invention can be applied. In the figure, reference numeral 1 indicates an inkjet printhead, and this inkjet printhead 1 introduces ink from a pump (not shown) through an introduction hole 2, and has a plurality of nozzles 3, 3, . . . provided in its longitudinal direction.・Separate the ink into droplets and spray them. The ink droplets are charged by the charging electrode 4 according to the image signal, and then deflected by the electric field created by the deflection electrode 5, flying onto the recording paper (not shown) and printing an image on the recording paper. It is something to do. In the figure, 6 indicates a discharge hole for discharging ink as necessary.

Further, the inkjet print head 1 is configured as shown below. As shown in FIG. 2, the inkjet print head 1 includes a head body 7 made of a square piece of metal such as stainless steel, and the head body 7 has a circular cross-section as shown in FIG. An ink flow path 8 is formed in a penetrating manner. This ink flow path 8
The diameter of is set to 3 mm, for example. The head main body 7 also has small holes 9.9 at regular intervals on its negative side.
A large number of small holes 9,9... are drilled, and these small holes 9,9... penetrate to the surface. Further, a nozzle plate 10 is fixed to the surface of the head body 7, and the nozzle plate 10 has nozzles 10 arranged at intervals corresponding to the small holes 9, 9, .
1.11... is drilled.

At both ends of the head body 7, an ultrasonic exciter 12 and an ultrasonic absorber 13 are provided, as shown in FIG. Then, the ultrasonic exciter 12 generates an ultrasonic wave, propagates the traveling wave of the ultrasonic wave in the ink flow path 8, and applies ultrasonic vibration to the inkjet ejected from the nozzles 11, 11... , which produces ink drips.

The ultrasonic wave propagated within the ink flow path 8 is transmitted to an ultrasonic absorber 13.
is absorbed by the waves, so that no reflected waves are generated. In the figure, 14 and 15 indicate ink introduction holes and ink discharge holes provided in the head body 7, respectively.

FIG. 4 shows the ultrasonic exciter as an embodiment of the ultrasonic generator according to the present invention.

This ultrasonic exciter is configured such that a piezoelectric vibrator is fixed to a diaphragm member, and the diaphragm member is attached to one end of a printhead body.

That is, the ultrasonic exciter 12 has P as a piezoelectric vibrator.
It is equipped with a ZT ceramic 16, and this PZT ceramic 16 has a diameter of 2.3 mm and a thickness of 005 to 5 mm, for example.
A disk-shaped one of mm is used.

As shown in FIG. 5, electrodes 17 are formed on both ends of the PZT ceramic 16 by depositing a metal such as silver.
17 is formed, and this electrode 17.17 is made of PZT.
It has the same shape as the end face shape of the ceramic 16. This PZT ceramic 16 vibrates in the thickness direction by applying a voltage to the electrodes 17 and 17, thereby generating ultrasonic waves.

As shown in FIG. 6, the PZT ceramic 16 is adhesively fixed to a shim 18 as a diaphragm member using an epoxy adhesive. A stainless steel plate having ink resistance is used as the shim 18, and the shim 18 is preferably a thin one, and has a thickness of, for example, 50 μm.

However, the thickness of the shim 18 is not limited to this, and is set to about 20 to 500 μm depending on the material, shape, etc.

On the end face of the PZT ceramic 16, there is an electrode 1 as described above.
7 is formed, and this PZT electrode 17 is formed.
The end face of the ceramic 16 is fixed to the τ shim 18 via an adhesive as an insulating material.
An electrical connection between the electrode 17 formed on the end face of the shim 18 and the shim 18 can be reliably obtained.

Further, the planar shape of the shim 18 is formed into a disk shape having a smaller diameter than the end surface shape of the head body 7, as shown in FIG. The shim 18 is liquid-tightly fixed to the end surface of the head body 7 with an epoxy adhesive so that the centers of the PZT ceramic 16 and the ink flow path 8 coincide.

In the ultrasonic exciter 12, as shown in FIG.
is connected to the power source 120 via a lead wire 21.

The drive frequency F of the drive power supply 20 can have a large amplitude with a relatively low voltage, and if set at the peak of vibration, the vibration will become unstable, so the drive frequency F should be set close to the peak. is preferable.

Further, as shown in FIG. 8, the other end of the head body 7 has a
An ultrasonic absorber 13 is provided to absorb ultrasonic waves.

This ultrasonic absorber 13 is equipped with a silicone rubber 22 having a knife-shaped tip 22a, and this silicone rubber 22 makes the reflected wave zero with respect to the incident wave, and also attenuates the incident ultrasonic wave. It looks like this.

The silicone rubber 22 is fitted into the holding container 37,
This holding member 23 is fixed to the head body 7 by a groove 24.24. A groove 25 is bored in the inner end of the holding member 23, and an O-ring 26 is disposed in the groove 25 to prevent ink from leaking.

In the above configuration, the ultrasonic generator according to this embodiment generates ultrasonic waves as follows. That is, a high frequency voltage is applied to the electrodes 17.17 of the ultrasonic exciter 12 by the power source 20, and the PZT ceramic 16 generates ultrasonic vibrations. At this time, the PZT ceramic 16 vibrates in the thickness direction like a simple piston, as shown in FIG. 9, and this vibration propagates to the shim 18.
8, as shown in FIG. 10, makes a simple first-order vibration using the fixed portion located around the ink flow path 8 as a node. In the figure, the broken line indicates the deformed state during vibration.

At this time, the shim 18 deforms into a spherical shape and vibrates, so
The generated ultrasound waves are spherical waves. This spherical wave ultrasonic vibration becomes a plane wave while propagating within the ink flow path 8 for one to two wavelengths. Therefore, it is desirable that the nozzles 11, 11, .

In this way, the ultrasonic exciter 12
6 is fixed to the shim 18 with adhesive, the structure is simple with a small number of parts, and the bonding state between the PZT ceramic 16 and the shim 18 can be ensured and uniform, so production lots can be reduced. The variation in drive voltage between the two is reduced. In addition, since the PZT ceramic 16 is fixed to the shim 18 with adhesive, the PZT ceramic 16 is
The Z1" ceramic 16 and the shim 18 can be firmly fixed to each other, and stable vibration characteristics can be obtained over a long period of time. The present applicants have developed an ultrasonic exciter 12 according to this embodiment. An experiment was conducted to investigate the vibration characteristics of.

First, the vibration state of the shim 18 is analyzed as follows. That is, the shim 18 vibrates as a circular plate defined by the ink flow path 8, that is, a disk whose circumference is fixed. The fundamental resonant frequency f in this case. 1 is given by the following equation as is known.

Here, t is the thickness of the shim 18, that is, 50 μm, 1a is the radius of the vibration region of the shim 18, that is, 1.5 mm, [- is Young's modulus, f is density, and a is Poisson's ratio. Young's modulus E
1 density a and Poisson's ratio a, the values of 5US304 were used. Find the value of 1, fH-53,5KH
z, f02-3.91XfO1-209KHz.

When a voltage was actually applied to the ultrasonic exciter 12 and the vibration characteristics were investigated, the results were as shown in FIG. 11. Since the PZT ceramic 16 is actually bonded to the shim 18, it does not show the ideal resonance peak as calculated, but results were obtained that were approximately in accordance with the conditions. Note that since the ink droplet generation frequency is 200 KHz, the ultrasonic exciter 12 is used near the secondary resonance point.

Furthermore, when a plurality of ultrasonic exciters 12 were actually manufactured as prototypes 1) and the appropriate driving voltage of each ultrasonic exciter 12 was measured, the results were as shown in FIG. 12. This result also shows that variations in drive voltage can be suppressed to a small level.

Furthermore, when ink droplets were actually generated using the ultrasonic exciter 12, it was found that the variation in the separation length of ink droplets was reduced as shown in FIG. 13.

FIG. 14 shows another embodiment of the present invention, in which the same parts as in the previous embodiment are given the same reference numerals. In this embodiment, the ink flow provided in the head body 7 is The end portion 8- of the channel 8 is configured to widen in a tapered shape toward the ultrasonic exciter 12 side. By doing this, the area where the shim 18 comes into contact with the ink can be increased, and the amplitude of the shim 18 can be increased, so the excitation efficiency can be improved and the driving voltage can be lowered. becomes. Furthermore, since the area in which the shim contacts the ink can be increased, a large amplitude can be obtained by using the PZT ceramic 16 with a large diameter.

Other configurations and functions are the same as in the previous embodiment, so
The explanation will be omitted.

FIG. 15 shows still another embodiment of the present invention, and the same parts as in the previous embodiment are given the same reference numerals. In this embodiment, a shim 1 as a diaphragm member is shown.
8 is not directly attached to the end surface of the head body 7, but the shim 18 is elastically held and attached to the end surface of the head body 7. That is, an O-ring 30 as an elastic member is attached to the end surface of the head body 7.
The fitting arrangement is such that a portion of the liquid is discharged from the end face of the liquid.

Therefore, a concave groove 31 for fitting the O-ring 30 is formed in the end surface of the head body 7 so as to be concentric with the ink flow path 8 .

Further, on the outside of the shim 18 disposed at the end of the head body 7, a presser block 32 for holding the shim 18 is provided.
is installed. This presser block 32 is formed into an annular shape having an opening 33 having approximately the same diameter as the ink flow path 8 . An O-ring 34 serving as an elastic member is fitted into the end of the presser block 32 on the head main body 7 side so that a portion of the O-ring 34 is ejected from the end of the presser block 32 . Therefore, a concave groove 35 for fitting the O-ring 34 is formed in the end face of the presser block 32 so as to be concentric with the ink flow path 8 . This O-ring 34 is the same as the O-ring 30 described above.

Then, the shim 18 to which the PZT ceramic 16 is fixed,
By fixing the presser block 32 to the end face of the head body 7 with screws 36 and 36 so as to sandwich it between the O-ring 30 on the head body 7 side and the O-ring 34 on the presser block 32 side, the ultrasonic exciter 12 can be attached to the head body. It is elastically attached to the end face of 7.

By doing this, the vibration of the ultrasonic exciter 12 is not directly transmitted to the head body 7 via the shim 18, so the vibration of the ultrasonic exciter 12 is involuntarily transmitted to the head body 7, and the vibration of the head body 7 is It is possible to prevent the ink jets ejected from the nozzles 11, 11, . . . from being adversely affected.

Since the other configurations and operations are the same as those in the embodiment described in FIJ, their explanations will be omitted.

FIG. 16 shows still another embodiment of the present invention, and the same parts as in the previous embodiment are given the same reference numerals. In this embodiment, a shim 18 as a diaphragm member is shown. Rather than directly elastically holding the shim 18 on the end surface of the head body 7, the shim 18 is configured such that its periphery is held by a rigid body, and the rigid body holding the shim 18 is elastically attached to the end surface of the head body 7. has been done.

That is, the shim 18 of the ultrasonic exciter 12 is fixed to a holding member 37 whose periphery is annular by adhesive or other means, and this holding member 37 has an opening 39 having the same shape as the ink flow path 8. are doing.

This holding member 37 is attached to the O-rings 30 and 3 on the head main body 7 side and the presser block 32 side as in the above embodiment.
It is held elastically by 4.

In such a case, the shim 18 holding the PZT ceramic 16 has its periphery fixed to the holding member 37, so that the shim 18 can reliably perform predetermined vibrations. Furthermore, since the holding member 37 to which the shim 18 is fixed is held elastically, vibrations can be prevented from being transmitted to the head main body 7 side inadvertently.

Other configurations and functions are the same as in the previous embodiment, so
The explanation will be omitted.

FIGS. 17 and 18 show still other embodiments of the present invention, and the same parts as in the above embodiments are denoted by the same reference numerals. In this embodiment,
The end portion 8' of the ink flow path 8 provided in the head body 7 is
It is configured to expand in a tapered shape toward the ultrasonic exciter 12 side.

By doing this, the area where the shim 18 comes into contact with the ink can be increased, and the amplitude of the shim 18 can be increased, so that the excitation efficiency can be improved and the driving voltage can be lowered. It becomes possible. Furthermore, since the area in which the shim contacts the ink can be increased, a large amplitude can be obtained by using the PZT ceramic 16 with a large diameter.

Other configurations and functions are the same as in the previous embodiment, so
The explanation will be omitted.

[Effects of the Invention] As described above, the piezoelectric vibrator is fixed to the diaphragm member, and the diaphragm member is attached to one end of the print head body. In an inkjet print head that uses traveling waves to generate ink droplets, it is possible to prevent variations in drive voltage from production lot to production lot, and to obtain stable vibration characteristics over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an inkjet print head to which an embodiment of the ultrasonic generator according to the present invention is applied, FIG. 2 is a front view showing the same print head, and FIG. Figure 4 is a cross-sectional view showing how the ultrasonic exciter is installed, Figure 5 is a perspective view showing the PZT ceramic, Figure 6 is a cross-sectional view of the ultrasonic exciter, and Figure 7 is the same. A side view of the ultrasonic exciter, FIG. 8 is a sectional view showing the ultrasonic absorber,
FIG. 9 is an explanatory diagram showing the vibration state of PZT ceramic, FIG. 10 is an explanatory diagram showing the vibration state of the shim, FIG. 11 is a graph showing the relationship between the driving frequency and vibration characteristics of the ultrasonic exciter, and FIG. The figure is a graph showing variation in drive voltage, No. 13.
The figure is a graph showing variations in the separation length of ink droplets, No. 14.
15 is a sectional view showing still another embodiment of the invention, FIG. 16 is a sectional view showing still another embodiment of the invention, and FIG. 17 and 18 are cross-sectional views showing still other embodiments of the present invention, FIG. 19 is a schematic diagram showing an inkjet printer to which the inkjet print head according to the invention can be applied, and FIG. 20 is a conventional inkjet printer. 21 is a plan view showing how the head is used; FIG. 22 is a graph showing the separation length of ink droplets; FIG. 23 is a sectional view showing a conventional proposal; FIG. 24 is a cross-sectional view showing the ultrasonic generation equipment of the proposed example, and FIG. 25 is a graph showing variations in drive voltage. [Explanation of symbols] 1... Inkjet print head 7... Head body 8... Ink channel 12... Ultrasonic exciter 16... PZT ceramic 18... Shim patent applicant Fuji Xerox Co., Ltd. Agent Patent Attorney Tomohiro Nakamura (1 other person) Figure 4 Figure 11 Figure 12 Manufacturing lot Figure 10 Figure 13 Figure 14 Figure 15 Figure 21 Figure 22 Jet number Figure 23 Figure 19 Figure 20 Figure 24 Figure 25 Manufacturing loft

Claims (1)

[Claims] It is attached to one end of an inkjet printhead body that has an ink flow path along the longitudinal direction inside, and by applying ultrasonic vibration to the ink in the ink flow path, the ink ejected from the printhead body is transformed into ink droplets. In an ultrasonic generator for an inkjet print head for separating
An ultrasonic generator for an inkjet print head, characterized in that this diaphragm member is attached to one end of the print head body.